Method for calibrating numerical simulation results of inner flow field in centrifugal pump

Abstract

The invention relates to a method for calibrating the numerical simulation results of an inner flow field in a centrifugal pump. The method comprises the following steps: performing mechanical reformation in such specific regions as a tip clearance on a centrifugal pump prototype and the exit of a pumping chamber, so as to ensure that the specific regions are transparent and visible; utilizing the PIV technology to measure the transient whole-flow-field velocity distribution in the specific regions, and obtaining such statistics characteristic parameters as the regional average velocity in the specific regions; conducting contrastive analysis on the PIV experimental results in the specific regions and the numerical simulation results, including the overall distribution characteristics of a velocity vector, the average velocity, and other statistics characteristic parameters; quantitively checking the accuracy of the numerical simulation results, and repeatedly modifying the key parameters, such as a fluid domain, a grid, an initial condition and a calculation model, in a numerical simulation process to correct the numerical simulation results, thereby achieving the aim of calibrating the numerical simulation results of the inner flow field in the centrifugal pump. The method is low in experimental cost, short in period, and higher in applicability and feasibility.

Description

Technical field [0001] The invention relates to a method for calibrating numerical simulation results of the internal flow field of a centrifugal pump. Background technique [0002] The pump is a general-purpose mechanical equipment with a large volume and a wide range of energy consumption. According to statistics from the China Pump Association, the total annual output value of the national pump industry in 2010 was more than 100 billion yuan, and 20-25% of the national power generation each year was consumed in pump products. Among all pump products, centrifugal pumps have the advantages of simple structure, convenient use and maintenance, large flow, and high lift. They are used in petrochemical, mining, metallurgy, electric power, urban water supply and drainage, sewage treatment and other industries. Efficiency is of key significance to the realization of national energy conservation and emission reduction targets. Take the high-power double-suction centrifugal pump as an...

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Problems solved by technology

[0007] However, so far, the relevant research using PIV is limited to centrifugal pumps with low specific speed and small size. This is mainly because when PIV is applied to the measurement of the internal flow field of the pump, the wall of the area to be measured must be transparent. , so that the CCD camera can capture particle images. For small pumps, although the cost is expensive, the pump casing and even the impeller can still be processed with transparent materials to meet the test requirements of PIV, and the cost is acceptable; for large pumps As far as the pump is concerned, it will be very expensive and impractical to process the same transparent whole machine, and the general transparent material is also difficult to withstand the stress caused by the internal flow field of the large pump

Therefore, for large-size, high-power, high-speed centrifugal pumps, no experimental research on the application of PIV technology has been seen.

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