Abstract
Pressure, temperature, gas sampling, and optical measurements were made in the turbulent separated flow region upstream of jets. Hot hydrogen, helium, and nitrogen were injected from a converging slot nozzle perpendicular to the heated Mach 2.5 airstream above a flat plate. The dependence of the separation distance, wall pressure, and side force on the jet to freestream pressure and density ratios and the separation Reynolds number was determined. The injectant concentration in the separated flow region was found to be high, and to correlate with a ratio of the injectant and freestream temperatures and molecular weights. A tracer gas injection technique was used to determine air and injectant mass transport rates through the separated flow region. Approximately five percent of the gas injected passed through this region.
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