Low-noise hydraulic design method of centrifugal pump with low specific speed

Abstract

The invention discloses a low-noise design method of a centrifugal pump with low specific speed, and relates to an active control method of flow noise of turbomachinery. The design method comprises the steps that firstly, main structural dimensions of a centrifugal pump impeller and a helical pumping chamber (volute) are obtained by the traditional low-specific-speed pump design method; secondly, an internal flow field of the pump is computed by a computational fluid mechanics method; the performance of the pump is predicted whether to meet a design requirement; an optimum design improvement is performed by analyzing a stationary flow field; thirdly, flow induction noise of the pump with low specific speed is predicted by a computational acoustics method; if a flow noise index is qualified, the design is accomplished; if the flow noise index is disqualified, subsequent steps are performed; fourthly, the diameter of the impeller basically meeting a performance requirement in the design is adjusted to allow a gap between the impeller and a volute tongue to be increased continuously to 20%; splitter blades are added in the middles of blades to increase the lift, control the flow situation, and ensure the efficiency; and finally, the pump subjected to the impeller improvement design is subjected to noise prediction; if the flow noise index is qualified, the design is accomplished; and if the flow noise index is disqualified, the beginning step is repeated. The design method shortens the research and development period, saves the development cost, effectively improves the design quality of the centrifugal pump, can simultaneously meet low-noise requirements of the lift and the efficiency, and realizes optimization of the performance of the complete centrifugal pump with low specific speed.

Description

technical field [0001] The invention relates to a centrifugal impeller design method in the design of hydraulic machinery, which is suitable for the design of hydraulic components of centrifugal pumps with high requirements on noise performance, and especially refers to the design method of hydraulic components of low specific speed centrifugal pumps for reducing flow noise. Background technique [0002] In the field of national defense and anti-submarine, due to the gradual application of sonar reconnaissance technology, it is particularly important to carry out research on the active control of unit vibration and noise and the technical means of vibration and noise reduction. Low specific speed centrifugal pump is an important energy conversion device and fluid conveying equipment. It has the characteristics of small flow and high head, so it is widely used in urban water supply, boiler water supply, aerospace, petrochemical industry, light industry, urban gas transmission,...

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Problems solved by technology

Moreover, this method can better overcome the shortcomings of the traditional design method that cannot accurately predict the various performance indicators of the pump, and the test workload is large.

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