An Investigation Into the Performance of Two Inlet Nozzles for Flow Measurement

[+] Author and Article Information
H. Itō, Y. Watanabe

The Institute of High Speed Mechanics, Tōhoku University, Sendai, Japan

H. Ishimaru

Sagamihara Machinery Works, Mitsubishi Heavy Industries, Ltd., Sagamihara, Japan

Y. Abe

Odawara Factory, Fuji Photo Film Co., Ltd., Odawara, Japan

J. Fluids Eng 103(1), 67-72 (Mar 01, 1981) (6 pages) doi:10.1115/1.3240782 History: Received September 07, 1979; Online October 26, 2009


The discharge coefficients for two inlet nozzles with different contraction shapes were studied experimentally together with the behavior of the boundary layer on the nozzle wall. For the inlet nozzle which has the same contraction shape as the ISA 1932 nozzle, it was found that boundary-layer transition with an intermediary separation bubble is responsible for the occurrence of a large hump in the discharge coefficients. The well-rounded inlet nozzle showed a satisfactory performance. The effect of pressure tap size and that of the proximity of a wall to the inlet on discharge coefficients were quantified experimentally.

Copyright © 1981 by ASME
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