Study of Prototype 2-Stage Jet Type Pump : 1st Report, Characteristic Tests

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The jet pump works by means of tendency of a stream or jet of fluid to drive or carry contiguous particles along with it. In a jet pump the maximum possible realized suction capacity Q0 will be twice the driving capacity Q0, because of limitations in area ratio between nozzle and throat. In the case of the newly designed 2-stage jet pump, the suction openings of the 1st and 2nd stage are connected on an even water level. Further, suction water of the 1st stage is also utilized for driving the 2nd stage. One primary objective of designing this trial pump was to achieve Q3/Q0=4. Changes in construction design, based on experimentation, were incorporated in the test pump unit on which test results were obtained, as follows : (1) Q3/Q0>4 was obtained as anticipated ; further efficiency is favorable. (2) The pump without a diffuser in the first stage outlet showed higher performance than that of a pump having a diffuser. (3) The function of the 1st stage was not influenced by opening or closing the discharge valve. The performance of the pump was, however, affected critically by operation of the suction valve of the 1st stage.

収録刊行物

  • Bulletin of JSME

    Bulletin of JSME 7 (28), 737-745, 1964

    一般社団法人 日本機械学会

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