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Flow Induced Nutation Instability In Spinning Solid Propellant Rockets
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Book Synopsis Flow Induced Nutation Instability in Spinning Solid Propellant Rockets by : G. A. Flandro
Download or read book Flow Induced Nutation Instability in Spinning Solid Propellant Rockets written by G. A. Flandro and published by . This book was released on 1990 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work studies rocket motor internal ballistics on the observed coning instability of spinning, orbit raising propulsion stages. This phenomenon appeared in the PAM-D (STAR 48) vehicles. Unexpected coning appeared near the end of motor burn with final cone angles nearly 15 deg. Earlier vehicles of similar design were not afflicted. While no PAM missions were lost, lighter vehicles using the same propulsion concept and spin stabilization could be jeopardized. The exact cause of the instability needs to be found and corrected at the design stage. A better understanding is needed for attitude control systems to be designed on a rational basis. Capability to estimate nutation amplitudes is needed in system design decisions. These needs are met in the form of rational scaling laws that allow extension of experimental data to motor/ spacecraft configurations. Numerous physical mechanisms have been proposed to explain the PAM-D disturbing torque with most eliminated by failure to comply with telemetry data. Two mechanisms still remain to be more fully evaluated. One is the slag sloshing hypothesis, which links the instability to sloshing of accumulations of aluminum oxide slag within the aft closure of the rocket motor combustion chamber. This mechanism is preferred because it is similar to the familiar liquid stores sloshing nutation source with the driving mechanism linked to the mass center offset caused by the relative motion of the pool of liquid material. However, this interpretation predicts a sensitivity to vehicle acceleration that does not appear in the data. A much more massive vehicle, the SGS-II first stage, also employing the STAR 48 exhibits a torque gain factor that does not reflect acceleration sensitivity.
Book Synopsis The Study of Nutation Instability on Spinning Solid Propellanr Rockets by : J. Char
Download or read book The Study of Nutation Instability on Spinning Solid Propellanr Rockets written by J. Char and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Book Synopsis Evaluation of Tangential Velocity Effects on Spinning Transverse Combustion Instability by : Marcus F. Heidmann
Download or read book Evaluation of Tangential Velocity Effects on Spinning Transverse Combustion Instability written by Marcus F. Heidmann and published by . This book was released on 1966 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flight Mechanics Symposium written by and published by . This book was released on 1997 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fluid Mechanics of Spinning Rockets by : G. A. Flandro
Download or read book Fluid Mechanics of Spinning Rockets written by G. A. Flandro and published by . This book was released on 1987 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of a detailed investigation of the influence of time-dependent combustion gas flows on the attitude dynamics of spinning rocket propelled space vehicles. The work was motivated by a need to understand the origins of a potentially serious system performance problem first detected in the PAM-D series of spin stabilized upper stages. Small wobbling (often referred to as nutation or coning) induced during separation of the rocket motor burn. The growth ceased abruptly at motor burnout, and final cone angles as large as 17 deg were reached in some flights. The same phenomenon was encountered in two flights of the PAM-DII, a similar vehicle utilizing a larger motor. Conventional theories of spinning rocket dynamics failed to explain this behavior. Since the telemetry data shows that the severity of the problem depends on spacecraft mass properties and other system parameters, it is crucial that the origins of the instability be understood completely in order that serious mission degradation can be avoided in future orbit raising operations. A costly interim fix, which sidesteps the need to understand the physical origins of the problem, is the use of a strap-on nutation control system as used in the Air Force SGS II missions. This approach is in direct conflict with the philosophy of solid rocket space propulsion, which is based on its inherent simplicity and low cost.
Book Synopsis Flight Mechanics Symposium 1997 by :
Download or read book Flight Mechanics Symposium 1997 written by and published by . This book was released on 1997 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 1999 Flight Mechanics Symposium by : John P. Lynch
Download or read book 1999 Flight Mechanics Symposium written by John P. Lynch and published by . This book was released on 1999 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solid Propellant Rocket Research by : Martin Summerfield
Download or read book Solid Propellant Rocket Research written by Martin Summerfield and published by Elsevier. This book was released on 2013-11-11 with total page 713 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid Propellant Rocket Research
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1991-10 with total page 1502 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Laboratory Simulation of the Effect of Rocket Thrust on a Precessing Space Vehicle by : National Aeronautics and Space Adm Nasa
Download or read book Laboratory Simulation of the Effect of Rocket Thrust on a Precessing Space Vehicle written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11-12 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ground tests of solid propellant rocket motors have shown that metal-containing propellants produce various amounts of slag (primarily aluminum oxide) which is trapped in the motor case, causing a loss of specific impulse. Although not yet definitely established, the presence of a liquid pool of slag also may contribute to nutational instabilities that have been observed with certain spin-stabilized, upper-stage vehicles. Because of the rocket's axial acceleration, absent in the ground tests, estimates of in-flight slag mass have been very uncertain. Yet such estimates are needed to determine the magnitude of the control authority of the systems required for eliminating the instability. A test rig with an eccentrically mounted hemispherical bowl was designed and built which incorporates a follower force that properly aligns the thrust vector along the axis of spin. A program that computes the motion of a point mass in the spinning and precessing bowl was written. Using various RPMs, friction factors, and initial starting conditions, plots were generated showing the trace of the point mass around the inside of the fuel tank. The apparatus will incorporate future design features such as a variable nutation angle and a film height measuring instrument. Data obtained on the nutational instability characteristics will be used to determine order of magnitude estimates of control authority needed to minimize the sloshing effect. Alvarez, Oscar and Bausley, Henry and Cohen, Sam and Falcon-Martin, Miguel and Furumoto, Gary (Editor) and Horio, Asikin and Levitt, David and Walsh, Amy Unspecified Center ALUMINUM OXIDES; FUEL TANKS; GROUND TESTS; LIQUID SLOSHING; NUTATION; PROPELLANTS; ROCKET THRUST; SIMULATION; SLAGS; SOLID PROPELLANT ROCKET ENGINES; ESTIMATES; FRICTION FACTOR; LOSSES; MEASURING INSTRUMENTS; SPECIFIC IMPULSE; STABILITY...
Book Synopsis Liquid Propellant Rocket Combustion Instability by : David T. Harrje
Download or read book Liquid Propellant Rocket Combustion Instability written by David T. Harrje and published by . This book was released on 1972 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: The solution of problems of combustion instability for more effective communication between the various workers in this field is considered. The extent of combustion instability problems in liquid propellant rocket engines and recommendations for their solution are discussed. The most significant developments, both theoretical and experimental, are presented, with emphasis on fundamental principles and relationships between alternative approaches.
Book Synopsis Solid Propellant Processing Factors in Rocket Motor Design by : Carlton L. Horine
Download or read book Solid Propellant Processing Factors in Rocket Motor Design written by Carlton L. Horine and published by . This book was released on 1971 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spaceflight Mechanics 1997 written by and published by . This book was released on 1997 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Influence of Mean Flow on Rocket Motor Combustion Instability. Volume I. Basic Analysis, Mean Flow Application to the T-Burner. Volume II. Effect of Turbulence on Acoustic Waves in a Cavity. Volume III. Vortex Generated Sound in Solid Propellant by : Gary A. Flandro
Download or read book The Influence of Mean Flow on Rocket Motor Combustion Instability. Volume I. Basic Analysis, Mean Flow Application to the T-Burner. Volume II. Effect of Turbulence on Acoustic Waves in a Cavity. Volume III. Vortex Generated Sound in Solid Propellant written by Gary A. Flandro and published by . This book was released on 1972 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report consists of two problems related to acoustic combustion instability in solid propellant rockets. In the first problem, coupled acoustic cavities with mass flux across a common boundary are studied. Since the propellant grain in a solid rocket motor may assume various configurations to meet specific performance criteria, physical models considering two or more wave-carrying systems coupled together so that acoustic motion of each is affected by the other are required in the study of acoustic instability in some motor designs. In the second problem, linear analyses employing both one-dimensional and three-dimensional flow models of the T-burner are studied to resolve which is the more appropriate representation of the growth of acoustic models yield an identical expression for the acoustic growth rate of dominant longitudinal modes in the T-burner if properly formulated. (Author).
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1997 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Conference Publication written by and published by . This book was released on 1999 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
