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| Author | : H. O. Lewis |
| Publisher | : |
| Total Pages | : |
| Release | : 1995 |
| Genre | : |
| ISBN | : |
| Author | : Dave R. Moore |
| Publisher | : |
| Total Pages | : 90 |
| Release | : 1967 |
| Genre | : Ablation (Aerothermodynamics) |
| ISBN | : |
An experimental program has been conducted in the LTV Hypervelocity Wind Tunnel at M = 17 to investigate the effects of ablation product characteristics and thermal lags on re-entry vehicle dynamic stability. The free oscillation method of dynamic stability measurement was used and the ablation processes were simulated by the controlled mass injection through four sections of the porous model skin. The flow rates through the top and bottom quadrants were oscillated at the same frequency and at an amplitude proportional to the model motion. The thermal lag effect was investigated with nitrogen injection into nitrogen tunnel flow at several different mass flow rates and phase angles between the oscillating mass flow and the body motion. The ablation product study was conducted by injecting gases other than nitrogen with specific heat ratio and molecular weight being the test parameters in addition to mass flow rate. The results obtained from these tests indicate significant effect on dynamic stability with both injection phase angle and some characteristics of the injected gas. The effects of model frequency, Reynolds number and mass injection distribution were also investigated and some static pressure measurements were made near the aft of the model. Appendices to the report contain tabulations of the pertinent data and discussions of supporting analytical studies and data analysis.
| Author | : General Electric Company |
| Publisher | : |
| Total Pages | : 108 |
| Release | : 1967 |
| Genre | : Aerodynamics, Hypersonic |
| ISBN | : |
| Author | : Kurt R. Enkenhus |
| Publisher | : |
| Total Pages | : 636 |
| Release | : 1970 |
| Genre | : |
| ISBN | : |
| Author | : General Electric Company |
| Publisher | : |
| Total Pages | : 128 |
| Release | : 1967 |
| Genre | : Aerodynamics, Hypersonic |
| ISBN | : |
| Author | : Alfred Merle Morrison |
| Publisher | : |
| Total Pages | : 102 |
| Release | : 1975 |
| Genre | : Angle of attack (Aerodynamics) |
| ISBN | : |
A series of one-degree-of-freedom dynamic wind tunnel measurements were made for a standard Supersonic Tunnel Association ten degree cone with varying bluntnesses of .25, .1, .0167, and .07. Variations of the stability coefficients with angle-of-attack, bluntness, Reynolds number, and Mach number are obtained including Mach 18 data points for which no previous data existed. An explanation of reported difference between measured dynamic stability as obtained from ballistic range and wind tunnel techniques is offered. The equations of motion, data reduction techniques and experimental methods are also developed.
| Author | : Peter F. Intrieri |
| Publisher | : |
| Total Pages | : 40 |
| Release | : 1962 |
| Genre | : Noses (Space vehicles) |
| ISBN | : |
| Author | : Edwin F. Harrison |
| Publisher | : |
| Total Pages | : 28 |
| Release | : 1962 |
| Genre | : Equilibrium |
| ISBN | : |
| Author | : L. A. Marshall |
| Publisher | : |
| Total Pages | : 98 |
| Release | : 1967 |
| Genre | : Aerodynamics, Hypersonic |
| ISBN | : |
The report presents a summary of the important results obtained on a combined analytical and experimental program for investigation of the hypersonic dynamic stability of re-entry vehicles. An unsteady flow field solution is described which predicts the static and dynamic stability characteristics for vehicles which are executing small amplitude oscillations about zero angle of attack. Solutions were obtained for sharp and blunted, axisymmetric and two-dimensional shapes in real gas equilibrium flow. The experimental program was conducted in AEDC tunnel 'C' at Mach 10 and in the Ling-Temco-Vought Hot Shot tunnel at Mach 14 and 20 to obtain dynamic stability characteristics of a 10 degree cone. Data are presented to show the effect of bluntness ratio, reduced frequency, center of gravity location, Reynolds number and Mach number. Comparisons are made with various theoretical results and limited correlations are shown which establish significant trends.
| Author | : R. B. Hobbs (Jr.) |
| Publisher | : |
| Total Pages | : 118 |
| Release | : 1967 |
| Genre | : Aerodynamics, Hypersonic |
| ISBN | : |
Wind tunnel tests were conducted at M = 10 and at M = 14 and 20 to obtain experimental data on the hypersonic dynamic stability characteristics of a 10-degree half-angle cone. These data were generated to support dynamic stability studies and to evaluate the effects of many geometric and environmental variables, which influence the oscillatory motion of re-entry vehicles. The state-of-the-art of experimental ground testing in hypersonic dynamic stability is reviewed in detail with respect to simulation and data measuring capabilities. Data correlations were obtained to compare facilities and to evaluate the degree of consistency of results using different techniques in measuring and reducing the data. The confidence level for the data is established by means of these correlations, and conclusive interpretations of the data for application in flight estimates can only be made when the significance of these correlations are fully realized. The data correlations do bring out definite inconsistencies in test results and demonstrate the more obvious shortcomings of ground test simulation in this type of experiment research. Test results indicate that the 10-degree cone configuration is dynamically stable over the entire scope of matrix variables covered in the experimental program. Dynamic instabilities observed in flight remain unconfirmed by these ground test results.
