IGTC-85 An LDV Evaluation of Particle Lag Prediction Techniques in Supersonic Flows(Session D-6 MEASUREMENT TECHNIQUE)

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概要

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• A study has been performed in which the response of micron-sized particles suspended in air to an abrupt change in fluid velocity is examined. A review of particle lag models finds several methods of estimating the coefficient of drag of small particles in supersonic flows. None of these models has supporting data for the conditions encountered by seed particles in typical supersonic Laser Doppler Velocimeter (LDV) applications. A two component LDV was used to measure the lag of 0.6μm and 1.5μm polystyrene latex (PSL) particles across a shock with 10° of turning at Mach 2.46. It is shown that while the lag of the 0.6μm particles is adequately predicted by theory, the lag of the 1.5μm particles is overestimated by all theories reviewed. The experiment also reveals that the 0.6μm particles have a relaxation distance of less than 3mm in this flowfield, whereas the relaxation distance for the 1.5μm particles is in excess of 8mm.

著者

• Ng W.

  Mechanical Engineering Department Virginia Polytechnic Institute And State University

• Ng W.

  Mechanical Aerospace And Manufacturing Engineering Department Po Box 88 University Of Manchester Institute Of Science And Technology

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• IGTC-85 An LDV Evaluation of Particle Lag Prediction Techniques in Supersonic Flows(Session D-6 MEASUREMENT TECHNIQUE)

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