Supersonic Coaxial Jet Experiment for Computational Fluid Dynamics Code Validation

摘要

An experiment is described that has been conducted to acquire data for the validation of computational fluid dynamics codes used in the design of supersonic combustors. A coaxial nozzle has been designed to produce two uniform, pressure-matched coaxial flows at its exit. The center flow is a 95% He and 5% O_2 mixture at Mach 1.8, and the surrounding flow is air at Mach 1.8. The flow in the resultant supersonic, coaxial jet, which contains compressible mixing layers, is studied. Various methods have been employed in studying the jet flowfield, including schlieren visualization, pitot pressure, total temperature and gas sampling probe, surveys, and RELIEF velocimetry. Boundary conditions and uncertainties are characterized. VULCAN, a structured grid Navier-Stokes code, has been used to calculate the nozzle and jet flowfields, and the results are compared to the experiment.