Measurement of Dynamic Pressure in Shock Tube by Streak Photography,
MARCO SCIENTIFIC INC SUNNYVALE CA
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Instrumentation for application of the Mach angle technique to measure dynamic pressure of the stream flow in a shock tube is described. To develop Mach lines suitable for observation, a small conical probe was mounted on axis at the test station. An image converter camera, optics and a standard electronic flash lamp completed the instrumentation. In operation, a Mach cone was generated around the probe following passage of the incident shock wave. Conical flow theory relates the Mach angle to the flow Mach number and dynamic pressure. Photographs of the Mach cone were obtained for framing the streak mode of recording. It was found that a streak record offered the best detail of the flow.