Computing method for flow simulation in self-priming process of self-priming pump

Abstract

The invention discloses a computing method for flow simulation in a self-priming process of a self-priming pump. The computing method comprises the following steps that firstly, a self-priming centrifugal pump serves as a research object, and initial conditions of simulation computation are used for computation, wherein the determination method of the initial conditions of simulation computation comprises the steps that a section of water inlet pipe is filled with air to serve as the initial conditions of the simulation computation; secondly, an unsteady state numerical simulation means is utilized to simulate a gas-liquid two-phase flow transient process after the self-priming centrifugal pump is started; thirdly, self-priming performance parameters are estimated. The computing method has the advantages that the simulation problem of transient state gas-liquid two-phase flow fields in the self-priming process of the centrifugal pump can be resolved, the gas-liquid two-phase flowing process and state in the starting process of the self-priming centrifugal pump are mastered, defects of experimental research means are effectively made up for, capital and time investment of the experimental research means is saved, and the self-priming performance parameters can be estimated by analyzing of the change rule of gas and liquid phase flow along with time.

Description

technical field [0001] The invention relates to an optimization design technology of a self-priming pump, in particular to a calculation method for flow simulation of the self-priming process of the self-priming pump. Background technique [0002] Self-priming centrifugal pumps are widely used in petroleum, petrochemical, chemical, electric power, metallurgy, urban construction and other departments due to their unique self-priming function. After the self-priming pump is started, it first works as a vacuum pump, and when the air in the water inlet pipe is discharged, it becomes a general water pump. Therefore, the performance of the self-priming pump is divided into two parts: self-priming performance and water pump performance. The self-priming performance is generally measured by the self-priming time (or pumping rate) of the pump and the maximum self-priming height (or ultimate vacuum) of the pump, which are usually determined by means of experiments. However, the test...

AI Technical Summary

Problems solved by technology

The existing achievements basically use a fixed value of gas content at the inlet of the self-priming pump as the initial condition, but in reality, before the self-priming pump is started, a part of the inlet pipe is filled with gas; Inside, the air void ratio at the inlet of the pump varies significantly with time and space, and the current method cannot describe the characteristics and trends of the gas void percentage change, so the above simulation calculations will have a large deviation from the actual situation, and cannot good alternative to testing

Obviously, this kind of simulation and initial condition setting method cannot be applied to simulation calculation, optimization and design of self-priming pump at present.

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