Shock-Layer Measurements in T5 Shock Tunnel Hypersonic Flows Around a Cylinder Model

被引:2
作者
Finch, Peter M. [1 ]
Girard, Julian J. [1 ]
Schwartz, Tal [2 ]
Strand, Christopher L. [1 ]
Hanson, Ronald K. [1 ]
Yu, Wesley M. [3 ]
Austin, Joanna M. [3 ]
Hornung, Hans G. [4 ]
Gross, Thomas [5 ]
Schwartzentruber, Thomas E. [5 ]
机构
[1] Stanford Univ, Thermosci Div, High Temp Gasdynam Lab, Mech Engn, 452 Escondido Mall,Bldg 520, Stanford, CA 94305 USA
[2] Stanford Univ, Thermosci Div, High Temp Gasdynam Lab, Aeronaut & Astronaut, 452 Escondido Mall,Bldg 520, Stanford, CA 94305 USA
[3] CALTECH, Grad Aerosp Labs, Aerosp, 1200 E Calif Blvd,MC 105-50, Pasadena, CA 91125 USA
[4] CALTECH, Grad Aerosp Labs, Aeronaut, 1200 E Calif Blvd,MC 105-50, Pasadena, CA 91125 USA
[5] Univ Minnesota, Aerosp Engn & Mech, 107 Akerman Hall,110 Union St SE, Minneapolis, MN 55455 USA
关键词
Prandtl Meyer Expansion Fan; Shock Layers; Tunable Diode Laser Absorption Spectroscopy; Computational Fluid Dynamics; Enthalpy; Flow Measurement; Optical Sensor; Stagnation Pressure; Hypersonics; Lasers; THERMAL RATE CONSTANTS; NITRIC-OXIDE; TRANSVERSE JET; TEMPERATURE; SENSOR; HITEMP; NO;
D O I
10.2514/1.J063877
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
We report on near-body measurements of temperature and nitric oxide (NO) concentration in the hypersonic flows around a cylindrical test article in the Caltech T5 reflected shock tunnel. Flow measurements were made at 50 kHz using tunable diode laser absorption spectroscopy, deploying six lasers to probe an array of quantum state-specific transitions. Laser beams were positioned both in the freestream and behind the bow shock at specific locations deemed pertinent to computational fluid dynamics comparison and kinetic model evaluation. The fractions of laser beam pathlengths behind the shock in different spatial regions were also discerned, thus providing a measurement of shock location. This study consists of six total experiments ("shots") across two Mach similar to 5 conditions, characterized by total enthalpies of 8 and 16 MJ/kg and freestream velocities of 3.5 and 5 km/s, respectively. Freestream measurements generally concur with prior works in the T5, but with some non-trivial differences. Shock-layer measurements span from 2000 to 6000 K and feature noteworthy and expected variety among different zones within the post-shock region. Thermal equilibrium is generally held throughout the flowfield, but chemical nonequilibrium is commonly observed. NO is the primary spectroscopic target, but measurements of carbon monoxide, carbon dioxide, water, and atomic oxygen provide supplementary insights.
引用
收藏
页码:4292 / 4315
页数:24
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