Accession Number : AD0656492

Title :   INVESTIGATION OF ABLATION EFFECTS ON HYPERSONIC DYNAMIC STABILITY OF A 10 DEG. CONE.

Descriptive Note : Final rept. Jun 65-Nov 66,

Corporate Author : LTV AEROSPACE CORP DALLAS TEX LTV VOUGHT AERONAUTICS DIV

Personal Author(s) : Moore,Dave R. ; Stalmach,Charles J. , Jr. ; Pope,Thomas C.

Report Date : JAN 1967

Pagination or Media Count : 71

Abstract : 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)

Descriptors :   (*REENTRY VEHICLES, *DYNAMICS), (*HYPERSONIC WIND TUNNELS, *ABLATION), HYPERSONIC CHARACTERISTICS, STABILITY, WIND TUNNELS, VELOCITY, NITROGEN, THERMAL PROPERTIES, AERODYNAMIC CHARACTERISTICS, VACUUM, REYNOLDS NUMBER, MOTION, GAS FLOW, PRESSURE, MEASUREMENT, BOUNDARY LAYER

Subject Categories : Test Facilities, Equipment and Methods
      Fluid Mechanics
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE