LDVによるトルクコンバータの内部流れ計測

概要

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A laser Doppler velocimeter (LDV) was used to investigate complex three-dimensional unsteady flow fields in a three-element automotive torque converter. The refractive-index matching method, which allows matching of the refractive index of the structural material to that of the working fluid, was successfully applied to flow measurement in cross sections in the pump and turbine impellers. Preliminary experiments were conducted to determine the temperature of the working fluid and the density of the tracer particles. Data were acquired synchronously with impeller rotation, making it possible to obtain the circumferential variation of the flow velocity. The results show that reverse flow in the circulatory velocity was observed in some cross sections in the pump. It was also shown that the secondary flow on the measured plane varied considerably from one cross section to another. The accumulation of low energy fluid by the secondary flow well explains the flow separation and reverse flow behavior.
1998-10-25