Accession Number : AD0601371

Title :   STAGNATION POINT HEAT TRANSFER IN HIGH ENTHALPY GAS FLOWS. PART II: SHOCK LAYER RADIATIVE EMISSION DURING HYPERVELOCITY RE-ENTRY.

Descriptive Note : Rept. for Feb 63-Feb 64

Corporate Author : OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS

Personal Author(s) : Nerem,Robert M.

Report Date : MAR 1964

Pagination or Media Count : 111

Abstract : Experimental measurements of stagnation point equilibrium radiative heat transfer were performed using an arc driven shock tube facility and over the range of simulated flight velocities between 26,000 and 52,000 feet per second, and at altitudes from 100,000 to 170,000 feet. These measurements were compared with existing theoretical estimates; and wide disagreement is shown to exist at high temperatures and low densities where the continuum emission due to the deionization of N and O cations dominates the shock layer radiation. Using an approximate approach, a revised estimate is presented for the radiative emission from high temperature equilibrium air. This revised estimate is then applied to the determination of stagnation point equilibrium radiative heat transfer during re-entry at super-orbital velocities. A correlation for the shock layer emission rate useful in engineering design calculations is presented. A similar study concerning convective heat transfer appears in part I (AD-601 370) of this series. (Author)

Descriptors :   (*AERODYNAMIC HEATING, HEAT TRANSFER), (*ATMOSPHERE ENTRY, HEAT TRANSFER), (*HEAT TRANSFER, STAGNATION POINT), SHOCK TUBES, REENTRY VEHICLES, BLUNT BODIES, GAS FLOW, THERMAL RADIATION, SIMULATION, AIR, GAS IONIZATION, NITROGEN, OXYGEN, SHOCK WAVES, ENTHALPY

Distribution Statement : APPROVED FOR PUBLIC RELEASE