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Demonstration Of Separation Delay With Glow Discharge Plasma Actuators Nasa Tm 2003 212204 National Aeronautics And Space Administrat
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721774845 Total Pages :32 pages Book Rating :4.7/5 (748 download)
Book Synopsis Demonstration of Separation Delay with Glow-Discharge Plasma Actuators by : National Aeronautics and Space Administration (NASA)
Download or read book Demonstration of Separation Delay with Glow-Discharge Plasma Actuators written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-27 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Active flow control of boundary-layer separation using glow-discharge plasma actuators is studied experimentally. Separation is induced on a flat plate installed in a closed-circuit wind tunnel by a shaped insert on the opposite wall. The flow conditions represent flow over the suction surface of a modern low-pressure-turbine airfoil. The Reynolds number, based on wetted plate length and nominal exit velocity, is varied from 50,000 to 300,000, covering cruise to takeoff conditions. Low (0.2 percent) and high (2.5 percent) free-stream turbulence intensities are set using passive grids. A spanwise-oriented phased-plasma-array actuator, fabricated on a printed circuit board, is surface-flush-mounted upstream of the separation point and can provide forcing in a wide frequency range. Static surface pressure measurements and hot-wire anemometry of the base and controlled flows are performed and indicate that the glow-discharge plasma actuator is an effective device for separation control. Hultgren, Lennart S. and Ashpis, David E. Glenn Research Center NASA/TM-2003-212204/REV1, AIAA Paper 2003-1025, E-13807-1/REV1
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781793986146 Total Pages :34 pages Book Rating :4.9/5 (861 download)
Book Synopsis Delay of Transition Using Forced Damping by : National Aeronautics and Space Adm Nasa
Download or read book Delay of Transition Using Forced Damping written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-13 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several experiments which have reported a delay of transition are analyzed in terms of the frequencies of the induced disturbances generated by different flow control elements. Two of the experiments employed passive stabilizers in the boundary layer, one leading-edge bluntness, and one employed an active spark discharge in the boundary layer. It is found that the frequencies generated by the various elements lie in the damping region of the associated stability curve. It is concluded that the creation of strong disturbances in the damping region stabilizes the boundary-layer and delays the transition from laminar to turbulent flow. Exton, Reginald J. Langley Research Center NASA/TM-2014-218551, L-20496, NF1676L-20143
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721532797 Total Pages :34 pages Book Rating :4.5/5 (327 download)
Book Synopsis Plasma Emission Characteristics from a High Current Hollow Cathode in an Ion Thruster Discharge Chamber by : National Aeronautics and Space Administration (NASA)
Download or read book Plasma Emission Characteristics from a High Current Hollow Cathode in an Ion Thruster Discharge Chamber written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The presence of energetic ions produced by a hollow cathodes operating at high emission currents (greater than 5A) has been documented in the literature. In order to further elucidate these findings, an investigation of a high current cathode operating in an ion thruster discharge chamber has been undertaken. Using Langmuir probes, a low energy charged particle analyzer and emission spectroscopy, the behavior of the near-cathode plasma and the emitted ion energy distribution was characterized. The presence of energetic ions was confirmed. It was observed that these ions had energies in excess of the discharge voltage and thus cannot be simply explained by ions falling out of plasma through a potential difference of this order. Additionally, evidence provided by Langmuir probes suggests the existence of a double layer essentially separating the hollow cathode plasma column from the main discharge. The radial potential difference associated with this double layer was measured to be of order the ionization potential. Foster, John E. and Patterson, Michael J. Glenn Research Center NASA/TM-2002-211876, NAS 1.15:211876, E-13558, AIAA Paper 2002-4102
Book Synopsis Introduction to the Kinetics of Glow Discharges by : Chengxun Yuan
Download or read book Introduction to the Kinetics of Glow Discharges written by Chengxun Yuan and published by Morgan & Claypool Publishers. This book was released on 2018-08-20 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electric glow discharges (glows) can be found almost everywhere, from atmospheric electricity to modern plasma technologies, and have long been the object of research. The main purpose of this book is to provide simple illustrations of the basic physical mechanisms and principles that determine the properties of electric glow discharges. It should enable readers to successfully participate in scientific and technical progress.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781725509191 Total Pages :32 pages Book Rating :4.5/5 (91 download)
Book Synopsis Causality of Plasma Permittivity with Loss and Restoring Terms by : National Aeronautics and Space Administration (NASA)
Download or read book Causality of Plasma Permittivity with Loss and Restoring Terms written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-16 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: The causality of the complex permittivity for a plasma model in which both loss and restoring terms are included is shown. Discussions as to what occurs in this causality property when the loss and restoring terms vanish are presented. Results are shown to agree with earlier work. Cockrell, C. R. Langley Research Center NASA-TM-101671, NAS 1.15:101671 RTOP 583-01-11-12...
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781729231999 Total Pages :50 pages Book Rating :4.2/5 (319 download)
Book Synopsis Plasma Puff Initiation of High Coulomb Transfer Switches by : National Aeronautics and Space Adm Nasa
Download or read book Plasma Puff Initiation of High Coulomb Transfer Switches written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-10-25 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: The plasma-puff triggering mechanism based on a hypocycloidal pinch geometry was investigated to determine the optimal operating conditions for the azimuthally uniform surface flashover which initiates plasma-puff under wide range of fill gas pressure of Ar, He and N2. The optimal fill gas pressure for the azimuthally uniform plasma-puff was about 120 mTorr and 450 Torr for He and N2, and between 120 mTorr and 5 Torr for Ar. The inverse pinch switch was triggered with the plasma-puff and the switching capability under various electrical parameters and working gas pressures of Ar, He and N2 was determined. It was also shown that the azimuthally uniform switching discharges were dependent on the type of fill gas and its fill pressure. A new concept of plasma-focus driven plasma-puff was also discussed in comparison with the hypocycloidal pinch plasma-puff triggering. The main discharge of inverse pinch switch with plasma-focus driven plasma-puff trigger is found to be more azimuthally uniform than that with hypocycloidal pinch plasma-puff trigger in a gas pressure region between 80 mTorr and 1 Torr. Venable, D. D. and Choi, E. H. Unspecified Center NAG1-970...
Book Synopsis Plasma Emission of a Glow Discharge in Moist Air by : K. S. Garger
Download or read book Plasma Emission of a Glow Discharge in Moist Air written by K. S. Garger and published by . This book was released on 195? with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Properties of Large Scale Plasma Flow During the Early Stage of the Plasmaspheric Refilling by : National Aeronautics and Space Adm Nasa
Download or read book Properties of Large Scale Plasma Flow During the Early Stage of the Plasmaspheric Refilling written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-10-17 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective is to better characterize the macroscopic properties of the interhemisphere plasma flow by solving a more complete set of hydrodynamic equations than that solved previously. Specifically, the ion continuity, momentum and energy equations were solved for the plasma flow along the closed magnetic field lines. During the initial stage of the supersonic outflow in the equatorial region, the ions cool substantially. Using the hydrodynamic model for the large-scale plasma flow, the dynamics of shocks was examined which form in the geomagnetic flux tubes during the early stages of refilling. These shocks are more like those forming in neutral gases than the electrostatic shocks driven by microinstabilities involving ion-ion interaction. Therefore, the shocks seen in the hydrodynamic model are termed as hydrodynamic shocks. Such shocks are generally unsteady and therefore the usual shock jump conditions given by Rankine-Hugoniot relations are not strictly applicable to them. The density, flow velocity and temperature structures associated with the shocks are examined for both asymmetrical and symmetrical flows. In the asymmetrical flow the outflow from one of two conjugate ionospheres is dominant. On the other hand, in the symmetrical case outflows from the two ionospheric sources are identical. Both cases are treated by a two-stream model. In the late type of flow, the early-time refilling shows a relaxation type of oscillation, which is driven by the large-scale interactions between the two identical streams. After this early stage, the resulting temperature structure shows some interesting features. In the equatorial region the streams are isothermal, but in the off-equatorial regions the streams have quite different temperatures, and also densities and flow velocities. The dense and slow stream is found to be warmer than the low-density fast stream. In the late stage of refilling, the temperature is found to steadily increase from the conjugate ionospheres...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781725589797 Total Pages :36 pages Book Rating :4.5/5 (897 download)
Book Synopsis Digital System Upset. the Effects of Simulated Lightning-Induced Transients on a General-Purpose Microprocessor by : National Aeronautics and Space Administration (NASA)
Download or read book Digital System Upset. the Effects of Simulated Lightning-Induced Transients on a General-Purpose Microprocessor written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-14 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flight critical computer based control systems designed for advanced aircraft must exhibit ultrareliable performance in lightning charged environments. Digital system upset can occur as a result of lightning induced electrical transients, and a methodology was developed to test specific digital systems for upset susceptibility. Initial upset data indicates that there are several distinct upset modes and that the occurrence of upset is related to the relative synchronization of the transient input with the processing sate of the digital system. A large upset test data base will aid in the formulation and verification of analytical upset reliability modeling techniques which are being developed. Belcastro, C. M. Langley Research Center NASA-TM-84652, NAS 1.15:84652 RTOP 505-34-13-34...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722734749 Total Pages :34 pages Book Rating :4.7/5 (347 download)
Book Synopsis Research on Plasma-Puff Initiation of High Coulomb Transfer Switches by : National Aeronautics and Space Administration (NASA)
Download or read book Research on Plasma-Puff Initiation of High Coulomb Transfer Switches written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-11 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The plasma-puff triggering mechanism based on hypocycloidal pinch geometry was investigated to determine the optimal operating conditions for an azimuthally uniform surface flashover which initiates plasma-puff under wide ranges of fill gas pressures of Ar, He and N2. Research is presented and resulting conference papers are attached. These papers include 'Characteristics of Plasma-Puff Trigger for an Inverse-Pinch Plasma Switch'; 'Ultra-High-Power Plasma Switch INPUTS for Pulse Power Systems'; 'Characteristics of Switching Plasma in an Inverse-Pinch Switch'; 'Comparative Study of INPIStron and Spark Gap'; and 'INPIStron Switched Pulsed Power for Dense Plasma Pinches.' Venable, Demetrius D. and Han, Kwang S. Unspecified Center NAG1-970...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722725136 Total Pages :46 pages Book Rating :4.7/5 (251 download)
Book Synopsis Recombination of H3(+) and D3(+) Ions in a Flowing Afterglow Plasma by : National Aeronautics and Space Administration (NASA)
Download or read book Recombination of H3(+) and D3(+) Ions in a Flowing Afterglow Plasma written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-10 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: The analysis of flowing afterglow plasmas containing H3(+) or D3(+) ions indicates that the de-ionization of such plasmas does not occur by simple dissociative recombination of ions with electrons. An alternative model of de-ionization is proposed in which electrons are captured into H3(**) auto-ionization Rydberg states that are stabilized by collisional mixing of the Rydberg molecules' angular momenta. The proposed mechanism would enable de-ionization to occur without the need for dissociative recombination by the mechanisms of potential-surface crossings. Gougousi, T. and Johnsen, R. and Golde, M. F. Unspecified Center NAGw-1764...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781725110175 Total Pages :36 pages Book Rating :4.1/5 (11 download)
Book Synopsis Analog-Digital Simulation of Transient-Induced Logic Errors and Upset Susceptibility of an Advanced Control System by : National Aeronautics and Space Administration (NASA)
Download or read book Analog-Digital Simulation of Transient-Induced Logic Errors and Upset Susceptibility of an Advanced Control System written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-16 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: A simulation study is described which predicts the susceptibility of an advanced control system to electrical transients resulting in logic errors, latched errors, error propagation, and digital upset. The system is based on a custom-designed microprocessor and it incorporates fault-tolerant techniques. The system under test and the method to perform the transient injection experiment are described. Results for 2100 transient injections are analyzed and classified according to charge level, type of error, and location of injection. Carreno, Victor A. and Choi, G. and Iyer, R. K. Langley Research Center NASA-TM-4241, L-16714, NAS 1.15:4241 RTOP 505-66-21-04...
Book Synopsis Plasma Contactor Research, 1989 by : National Aeronaut Administration (Nasa)
Download or read book Plasma Contactor Research, 1989 written by National Aeronaut Administration (Nasa) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-10 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The characteristics of double layers observed by researchers investigating magnetospheric phenomena are contrasted to those observed in plasma contacting experiments. Experiments in the electron collection mode of the plasma contacting process were performed and the results confirm a simple model of this process for current levels ranging to 3 A. Experimental results were also obtained in a study of the process of electron emission from a hollow cathode plasma contactor. High energy ions are observed coming from the cathode in addition to the electrons and a phenomenological model that suggests a mechanism by which this could occur is presented. Experimental results showing the effects of the design parameters of the ambient plasma simulator on the plasma potential, electron temperature, electron density and plasma noise levels induced in plasma contacting experiments are presented. A preferred simulator design is selected on the basis of these results. Williams, John D. Unspecified Center...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722108793 Total Pages :48 pages Book Rating :4.1/5 (87 download)
Book Synopsis Comparison of Hydrodynamic and Semi-Kinetic Treatments for Plasma Flow Along Closed Field Lines by : National Aeronautics and Space Administration (NASA)
Download or read book Comparison of Hydrodynamic and Semi-Kinetic Treatments for Plasma Flow Along Closed Field Lines written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-30 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrodynamic and semi-kinetic treatments of plasma flow along closed geomagnetic field lines are compared. The hydrodynamic treatment is based on a simplified 16-moment set of transport equations as the equations for the heat flows are not solved; the heat flows are treated heuristically. The semi-kinetic treatment is based on a particle code. The comparison deals with the distributions of the plasma density, flow velocity, and parallel and perpendicular temperatures as obtained from the two treatments during the various stages of the flow. In the kinetic treatment, the appropriate boundary condition is the prescription of the velocity distribution functions for the particles entering the flux tubes at the ionospheric boundaries; those particles leaving the system are determined by the processes occurring in the flux tube. The prescribed distributions are half-Maxwellian with temperature T(sub 0) and density n(sub 0). In the hydrodynamic model, the prescribed boundary conditions are on density (n(sub 0)), flow velocity (V(sub 0)) and temperature (T(sub 0). It was found that results from the hydrodynamic treatment critically depend on V(sub 0); for early stages of the flow this treatment yields results in good agreement with those from the kinetic treatment, when V(sub 0) = square root of (kT(sub 0)/2 (pi)m), which is the average velocity of particles moving in a given direction for a Maxwellian distribution. During this early stage, the flows developing form the conjugate ionospheres show some distinct transitions. For the first hour or so, the flows are highly supersonic and penetrate deep into the opposite hemispheres, and both hydrodynamics and kinetic treatments yield almost similar features. It is found that during this period heatflow effects are negligibly small. When a flow penetrates deep into the opposite hemisphere, the kinetic treatment predicts reflection and setting up of counterstreaming. In contrast, the hydrodynamic treatment yields a shock in the f...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723187629 Total Pages :140 pages Book Rating :4.1/5 (876 download)
Book Synopsis Ird Dropout Study by : National Aeronautics and Space Administration (NASA)
Download or read book Ird Dropout Study written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-18 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: This final report describes work performed by SRS Technologies for the NASA Marshall Space Flight Center under Contract NAS8-39077, entitled 'Integrated Receiver-Decoder Dropout Study'. The purpose of the study was to determine causes of signal fading effects on ultra-high-frequency (UHF) range safety transmissions to the Space Shuttle during flyout. Of particular interest were deep fades observed at the External Tank (ET) Integrated Receiver-Decoder (IRD) during the flyout interval between solid rocket booster separation and ET separation. Analytical and simulation methods were employed in this study to assess observations captured in flight telemetry data records. Conclusions based on the study are presented in this report, and recommendations are given for future experimental validation of the results. Yalowitz, Jeffrey S. and Schroer, Michael A. and Dickson, John E., Jr. Unspecified Center COMMAND AND CONTROL; DROPOUTS; RANGE SAFETY; SIGNAL FADING; SPACE SHUTTLES; SPACECRAFT LAUNCHING; ULTRAHIGH FREQUENCIES; ABORT APPARATUS; ASCENT TRAJECTORIES; EXTERNAL TANKS; ROCKET EXHAUST; SPACE SHUTTLE BOOSTERS; STAGE SEPARATION...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722356699 Total Pages :62 pages Book Rating :4.3/5 (566 download)
Book Synopsis Digital Active Material Processing Platform Effort (Damper), Sbir Phase 2 by : National Aeronautics and Space Administration (NASA)
Download or read book Digital Active Material Processing Platform Effort (Damper), Sbir Phase 2 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-06 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applied Technology Associates, Inc., (ATA) has demonstrated that inertial actuation can be employed effectively in digital, active vibration isolation systems. Inertial actuation involves the use of momentum exchange to produce corrective forces which act directly on the payload being actively isolated. In a typical active vibration isolation system, accelerometers are used to measure the inertial motion of the payload. The signals from the accelerometers are then used to calculate the corrective forces required to counteract, or 'cancel out' the payload motion. Active vibration isolation is common technology, but the use of inertial actuation in such systems is novel, and is the focus of the DAMPER project. A May 1991 report was completed which documented the successful demonstration of inertial actuation, employed in the control of vibration in a single axis. In the 1 degree-of-freedom (1DOF) experiment a set of air bearing rails was used to suspend the payload, simulating a microgravity environment in a single horizontal axis. Digital Signal Processor (DSP) technology was used to calculate in real time, the control law between the accelerometer signals and the inertial actuators. The data obtained from this experiment verified that as much as 20 dB of rejection could be realized by this type of system. A discussion is included of recent tests performed in which vibrations were actively controlled in three axes simultaneously. In the three degree-of-freedom (3DOF) system, the air bearings were designed in such a way that the payload is free to rotate about the azimuth axis, as well as translate in the two horizontal directions. The actuator developed for the DAMPER project has applications beyond payload isolation, including structural damping and source vibration isolation. This report includes a brief discussion of these applications, as well as a commercialization plan for the actuator. Blackburn, John and Smith, Dennis Unspecified Center...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722771300 Total Pages :88 pages Book Rating :4.7/5 (713 download)
Book Synopsis Static Internal Performance of a Nonaxisymmetric Vaned Thrust Reverser with Flow Splay Capability by : National Aeronautics and Space Administration (NASA)
Download or read book Static Internal Performance of a Nonaxisymmetric Vaned Thrust Reverser with Flow Splay Capability written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-10 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was conducted in the Static Test Facility of the Langley 16-Foot Transonic Tunnel on a dual-port, nonaxisymmetric, block-and-turn type thrust reverser model with vane cascades in the reverser ports which turned the flow in the splay direction and aided in turning the flow in the reverse direction. Splaying reverser flow is a method of delaying to lower landing ground roll speeds the reingestion of hot exhaust flow into the inlets. Exhaust flow splay can also help prevent the impingement of hot exhaust gases on the empennage surfaces when the reverser is integrated into an actual airframe. The vane cascades consisted of two sets of perpendicular vanes with a variable number of turning and splay vanes. A skewed vane box was also tested which had only one set of vanes angled to provide both turning and splay. Vane cascades were designed to provide different amounts of flow splay in the top and bottom ports. Inner doors, trim tabs, and an orifice plate all provided means of varying the port area for reverser flow modulation. The outer door position was varied as a means of influencing the flow reverse angle. Nozzle pressure ratio was varied from 1.75 to approximately 6.00. Bangert, Linda S. and Leavitt, Laurence D. Langley Research Center...
