Accession Number : AD0469693


Title :   MEASUREMENTS OF THE RADIATION FROM AN ABLATION CONTAMINATED BOUNDARY LAYER UNDER SIMULATED FLIGHT CONDITIONS


Descriptive Note : Research rept.


Corporate Author : AVCO EVERETT RESEARCH LAB INC EVERETT MA


Personal Author(s) : Wray, K L ; Rose, P H ; Koritz, H E


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/469693.pdf


Report Date : Aug 1965


Pagination or Media Count : 45


Abstract : This paper describes a 300 kW, 1 atmosphere arc jet facility which is capable of partially simulating the boundary layer produced on an ablating re- entry vehicle. The portion of the boundary layer from the ablating wall out to the maximum temperature is simulated. The simulation parameter developed is the ratio of the characteristic flow time in the boundary layer to the chemical time. Temperatures between 3000 and 6000 K are obtainable in the arc. In this range the arc-heated air is shown to be uniformly heated and in equilibrium. A method of positioning an ablative sample in the arc jet is described which produces a two-dimensional ablating boundary layer perpendicular to the ablating surface to better than 1/10 the boundary layer thickness. The integrated radiation emanating from this boundary layer has been studied with photomultipliers, and spatially resolved spectral plates have been taken.


Descriptors :   *REENTRY VEHICLES , ABLATION , BOUNDARY LAYER , CONTAMINATION , HALOCARBON PLASTICS , HIGH TEMPERATURE , INFRARED SPECTRA , INTENSITY , MODEL TESTS , NITROGEN , NOSE CONES , PHOTOMULTIPLIER TUBES , SIMULATION , SPECTROPHOTOMETERS , SPECTROSCOPY , SPECTRUM ANALYZERS , TEST METHODS , THERMAL RADIATION , TURBULENT BOUNDARY LAYER , TWO DIMENSIONAL FLOW , ULTRAVIOLET SPECTRA , VISIBLE SPECTRA


Subject Categories : Guided Missile Reentry Vehicles
      Unmanned Spacecraft


Distribution Statement : APPROVED FOR PUBLIC RELEASE