Supersonic coaxial jet experiment for CFD code validation

Abstract

A supersonic coaxial jet facility has been designed to provide experimental data suitable for the validation of CFD codes used to analyze high-speed propulsion flows. The center jet is of a light gas and the coflow jet is of air, and the mixing layer between them is compressible. Various methods have been employed in characterizing the jet flow field, including schlieren visualization, pitot, total temperature and gas sampling probe surveying, and RELIEF velocimetry. A NavierStokes code has been used to calculate the nozzle flow field and the results compared to the experiment.

Modeling Scramjet Flows with Variable Turbulent Prandtl and Schmidt Numbers

“…Because of this, the present theory is validated by two sets of experiments involving supersonic mixing, 3,4 and one experiment involving supersonic combustion. 4 In the experiment of Cutler et al , 3 a coaxial nozzle was designed to produce two uniform coaxial jets at exit. The center jet consists of 95% of He and 5% O 2 by volume at a Mach number M = 1.8, while the outer jet is air at M = 1.8.…”

“…The model is used to predict the flows in two sets of mixing experiments, 3,4 and the reacting experiment of Ref. 4.…”

Modeling Scramjet Flows with Variable Turbulent Prandtl and Schmidt Numbers

“…It is shown in Ref. 2, which considered the role of variable turbulent Schmidt number on the mixing of supersonic streams, that a value of P r t = 0.9 gave the best fit for data from the experiment of Cutler et al , 3 while a value of 0.5 gave the best fit for the experiment of Burrows and Kurkov. 4 In an attempt to address this problem, a series of step-by-step investigations were carried out to develop a model that calculates P r t and Sc t as part of the solution and addresses turbulence/chemistry interactions.…”

Development of a Dual-Pump CARS System for Measurements in a Supersonic Combusting Free Jet

“…6,7 An axisymmetric supersonic, combusting, coaxial jet, providing good optical access and symmetry (useful to minimize the number of measurements required to characterize the flow) was chosen for our experiment. The facility provides a center jet of "vitiated" air, reproducing the sensible enthalpy of air entering the engine of a hypersonic vehicle flying at Mach numbers between 5 and 7.…”