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Some Experiments On Impact Pressure Probes In A Low Density Hypervelocity Flow
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Book Synopsis Further Experiments on Impact-pressure Probes in a Low-density, Hypervelocity Flow by : A. B. Bailey
Download or read book Further Experiments on Impact-pressure Probes in a Low-density, Hypervelocity Flow written by A. B. Bailey and published by . This book was released on 1962 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation of the behavior of flat-faced, impact-pressure probes with a range of orificeto-probe diameter ratios was made in heated A under conditions where free stream Mach. = 4 to 14, gas temperature = 2700 to 4300 K, and Reynolds number (based on outside probe diameter and conditions behind a normal shock)/in. = 30 to 430. At the lower Reynolds numbers the measured impact pressure was found to decrease with the pressure sensing orifice size. This result agrees with that found in heated N. As the Reynolds number increased this orifice effect became less significant, and at the higher Reynolds numbers no decrease in measured impact pressure was noted for the smallest orifice tested. This tends to confirm the assumption made in some experiments on impact-pressure probes in a low-density hypervelocity flow (AD-268 391) that this behavior is caused by a thermomolecular flow effect. Because this effect is a function solely of pressure at a particular temperature, the greater the pressure the smaller the effect. When Re2 times the square root of density in free stream over density in normal shock is less than 800 in A the measured impact pressure was less than the true impact pressure and decreased to a minimum value, approximately 93% of the true value. As the Reynolds number decreased still further, the viscous effects became dominant, and there was a sharp increase in the measured impact pressure. (Author).s
Book Synopsis Some Experiments on Impact-pressure Probes in a Low-density, Hypervelocity Flow by : A. B. Bailey
Download or read book Some Experiments on Impact-pressure Probes in a Low-density, Hypervelocity Flow written by A. B. Bailey and published by . This book was released on 1961 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of the behavior of flat-faced, impact- pressure probes with a range of orifice-to-probe diameter ratios was made in heated nitrogen, where Mach number was 9.3, stagnation temperature was 3000 K, and the unit Reynolds number was 260/in. It was found, contrary to experience in low-density, unheated flows, that the impact pressure decreased with a reduction in orifice diameter for a fixed probe outer diameter in these tests. A discussion of the factors which could cause this decrease is contained herein. An analysis of the data indicates that in order to obtain as accurate a value of impact pressure as possible in low-density, hypervelocity flows, attention must be given to a number of factors, including viscous effects, thermal gradient effects, probe shape, thermal or chemical nonequilibrium, and non-continuum fluid phenomena.
Book Synopsis Some Experiments on Impact-pressure Probes in a Low-density, Hypervelocity Flow by : A. B. Bailey
Download or read book Some Experiments on Impact-pressure Probes in a Low-density, Hypervelocity Flow written by A. B. Bailey and published by . This book was released on 1961 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of the behavior of flat-faced, impact- pressure probes with a range of orifice-to-probe diameter ratios was made in heated nitrogen, where Mach number was 9.3, stagnation temperature was 3000 K, and the unit Reynolds number was 260/in. It was found, contrary to experience in low-density, unheated flows, that the impact pressure decreased with a reduction in orifice diameter for a fixed probe outer diameter in these tests. A discussion of the factors which could cause this decrease is contained herein. An analysis of the data indicates that in order to obtain as accurate a value of impact pressure as possible in low-density, hypervelocity flows, attention must be given to a number of factors, including viscous effects, thermal gradient effects, probe shape, thermal or chemical nonequilibrium, and non-continuum fluid phenomena.
Book Synopsis An Analysis of Initial Static Pressure Probe Measurements in a Low-density Hypervelocity Wind Tunnel by : David E. Boylan
Download or read book An Analysis of Initial Static Pressure Probe Measurements in a Low-density Hypervelocity Wind Tunnel written by David E. Boylan and published by . This book was released on 1963 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: An initial experimental program was previously conducted to study the problems in using static pressure probes for flow calibration purposes in low- density, hypervelocity wind tunnels with continuous flow. This data is reviewed in the light of more recent data on thermal transpiration. Results indicate that such probes may be used for what might be termed secondary calibrations, but care is required in interpreting the results. The present experiment yielded data which are compared to static pressures calculated from impact- pressure probe calibrations.
Download or read book NASA Technical Note written by and published by . This book was released on 1974 with total page 890 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Paper written by and published by . This book was released on 1983 with total page 572 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 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Keywords Index to U.S. Government Technical Reports by :
Download or read book Keywords Index to U.S. Government Technical Reports written by and published by . This book was released on 1962 with total page 1160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis U.S. Government Research Reports by :
Download or read book U.S. Government Research Reports written by and published by . This book was released on 1963 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Shock Shape and Shock Detachment Distance for Spheres and Flat-faced Bodies in Low-density, Hypervelocity, Argon Flow by : A. B. Bailey
Download or read book The Shock Shape and Shock Detachment Distance for Spheres and Flat-faced Bodies in Low-density, Hypervelocity, Argon Flow written by A. B. Bailey and published by . This book was released on 1963 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was made to determine the pressure distribution, shock shape, and shock detachment distance for spheres and the latter two characteristics for flatfaced bodies in a heated argon flow. The modified Newtonian approximation for the pressure distribution, which is strictly an empirical relationship, gives good results when applied to the first 60 degrees of a hemisphere under conditions where the body boundary layer and the shock layer merge. The natural flow visualization produced as a result of the high total temperature and consequent excitation of the argon enabled this study to be made. Photographs taken of the shocks generated by a series of spheres and flat-faced bodies were analyzed with a photo-densitometer to determine the shock shape and shock detachment distance. The blast analogy predicts a difference in the shape of shocks in argon and air at high Mach numbers and Reynolds numbers. An empirical relationship proposed by Love was used to calculate the shock shape in air for Mach numbers corresponding to those of the present investigation. (Author).
Book Synopsis Neutral Atmospheric structure measurements by : Pitot probe techniques
Download or read book Neutral Atmospheric structure measurements written by Pitot probe techniques and published by . This book was released on 1972 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Report written by and published by . This book was released on 1964 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report written by and published by . This book was released on 1965 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis NASA Technical Paper by : United States. National Aeronautics and Space Administration
Download or read book NASA Technical Paper written by United States. National Aeronautics and Space Administration and published by . This book was released on 1978 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index Aeronauticus written by and published by . This book was released on 1966 with total page 984 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Shock Shapes on Blunt Bodies in Hypersonic-hypervelocity Helium, Air, and CO2 Flows, and Calibration Results in Langley 6-inch Expansion Tube by : Charles George Miller
Download or read book Shock Shapes on Blunt Bodies in Hypersonic-hypervelocity Helium, Air, and CO2 Flows, and Calibration Results in Langley 6-inch Expansion Tube written by Charles George Miller and published by . This book was released on 1975 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Exploratory Study of Performance of the Langley Pilot Model Expansion Tube with a Hydrogen Driver by : Jim J. Jones
Download or read book Exploratory Study of Performance of the Langley Pilot Model Expansion Tube with a Hydrogen Driver written by Jim J. Jones and published by . This book was released on 1966 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
