FREE-STREAM TEMPERATURE, DENSITY, AND PRESSURE MEASUREMENTS IN AN EXPANSION TUBE FLOW

摘要

An experimental study has been conducted to determine test-flow conditions in the Langley pilot model expansion tube. Measurements of temperature, density, wall pressure, pitot pressure, and shock and interface velocities have been compared with theoretical cal¬culations based on various models of the flow cycle. The vibrational temperature and inte¬grated density of the molecular oxygen component of the flow were measured by use of vac¬uum ultraviolet absorption techniques. These measurements indicate both the presence and possible degree of nonequilibrium in the flow. Data are compared with several simplified models of the flow cycle, and data trends are discussed.