1465 低騒音風洞における LDV 計測に関する検討

概要

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In this paper, we discussed measurement system of LDV with high data rate for low noise wind tunnels. In order to improve the data rate of LDV system and reduce the turbulent intensity in the wake of the seeding system, water mist was provided at the settling chamber of the wind tunnel. The seeding unit was therefore installed into the pressurized seeding chamber which was constructed outside of the wind tunnel test-section. To avoid sound reflection, test sections of low noise wind tunnels are fabricated with porous materials, forward scattered LDV is difficult to be made use of. Thus, the authors compared the data rate of forward scattered LDV with than that of backward one and discussed possibility of utilization of forward scattered LDV with low noise wind tunnels. As a result, the data rate of LDV system was improved from 300Hz to 10kHz with the pressurized seeding system and forward scattered LDV. It revealed that the proposed technique is appropriate for measurement of flow field in which aerodynamic sound must be concerned.
社団法人日本機械学会の論文
2003-08-05