軸方向非一様流のもとにおける遠心圧縮機用円周ディフューザの性能に関する実験的研究

概要

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An experimental study was made of the effect of axially non-uniform flow on the performance of radial diffusers for centrifugal compressors. The test diffusers are parallel-sided vaneless and vaned ones and the inlet flow pattern was varied using specially made test rig. Measurements were made of the flow pattern and pressure recovery in the diffusers and their performance was evaluated with following results; (1) Generally, the inlet distortion decreases rapidly toward downstream in the case of vaneless diffusers. (2) With the flow having velocity peak at axially middle of a diffuser, the decrease of the inlet distortion is relatively slow and the pressure recovery is poor in the case of vaneless diffusers. (3) The diffuser efficiency is the highest and the loss coefficient is the lowest for near-uniform inlet flow, however, the pressure recovery can be higher than that of uniform flow for some type of distorted flow in the case of both vaneless and vaned diffusers. (4) A vaned diffuser can give higher pressure recovery than that of a vaneless diffuser even under axially non-uniform inlet flow. (5) The secondary flow in vaned diffusers makes the circumferential distribution of the outlet total pressure high near the suction side of the vanes and, in some cases, reverses the axial distribution of total pressure between the inlet and outlet of the vanes.
独立行政法人海上技術安全研究所の論文
1973-03-20