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Performance Test of Laser Velocimeter System for the Langley 16-foot Transonic Tunnel

出版	Defense Technical Information Center, 1985
URL	http://books.google.com.hk/books?id=c54TAQAAIAAJ&hl=&source=gbs_api

註釋And investigation has been conducted in which a laser velocimeter was used to measure free-stream velocities form Mach 0.1 to 1.0 and the flow velocities along the stagnating streamline of a hemisphere-cyclinder model at Mach 0.8 and 1.0. The flow velocity was also measured at Mach 1.0 along the line 0.533 model diameters below the model. These tests determined the performance characteristics of the dedicated two-component laser velocimeter at flow velocities up to Mach 1.0 and the effects of the wind tunnel environment on the particle-generating system and on the resulting size of the generated particles. To determine these characteristics, the measured particle velocities along the stagnating streamline at the two Mach numbers were compared with the theoretically predicted gas and particle velocities calculated using a transonic potential flow method. Through this comparison the mean detectable particle size (2.1 micrometers) along with the standard deviation of the detectable particle (0.76 micrometers) was determined; thus the performance characteritics of the laser velocimeter were established. Keywords: Laser velocity; Transonic flows; Particle sizing.