Cavitation performance of high-speed centrifugal pump with annular jet and inducer at different temperatures and void fractions
Cavitation performance of high-speed centrifugal pump with annular jet and inducer at different temperatures and void fractions
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DOI：
10.1007/s42241-019-0011-7
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发表时间：
2019-01
影响因子：
2.5
通讯作者：
Jin Jiang;Yanhui Li;Chong-yan Pei;Lin-lin Li;You Fu;Hong-gui Cheng;Qiang-qiang Sun
中科院分区：
文献类型：
--
作者：
Jin Jiang;Yanhui Li;Chong-yan Pei;Lin-lin Li;You Fu;Hong-gui Cheng;Qiang-qiang Sun
汽蚀现象在离心泵中非常普遍，特别是在高转速时，严重影响离心泵的性能。本文首次采用RNGk-ε湍流模型和考虑传质的汽蚀模型对高速离心泵的汽蚀性能进行了数值模拟，在不采取任何改善汽蚀性能的措施的情况下，对汽蚀性能进行了研究。计算结果表明，高速离心泵流道内出现大量气泡，其扬程和流量与设计工况相差较大。通过布置变螺距诱导轮和采用环形喷嘴方案，可以有效地改善空化性能。对泵的流场进行了分析，得到了不同含气率下泵的适宜工作温度分布。一方面，在相同含气率下，随着温度的升高，离心泵扬程下降缓慢;但是，当温度超过90℃时，泵的扬程迅速下降。另一方面，在恒定温度下，空泡率越高，空化性能越差。研究结果为设计高效的高速离心泵提供了一定的指导。
The cavitation is very common in a centrifugal pump, especially when the speed is very high, and it seriously influences the centrifugal pump performance. In this investigation, the RNGk-εturbulence model and the cavitation model with consideration of the mass transferring are first used to simulate the cavitation performance of the high-speed centrifugal pump without taking any measure for improving the pump cavitation performance. The calculation results reveal that a number of bubbles appear in the centrifugal pump flow channel, and the head as well as the flow rate of the high-speed centrifugal pump are far from its design condition. The cavitation performance can be improved effectively by arranging a variable pitch inducer and adopting an annular nozzle scheme. The flow field analysis of the pump is conducted to obtain the suitable working temperature distribution at different void fractions. On one hand, with the same void fraction, the head of the centrifugal pump drops slowly with the increase of temperature. However, when the temperature exceeds 90℃, the head of the pump drops rapidly. On the other hand, at the constant temperature, the higher the void fraction, the worse the cavitation performance. This research conducted under different temperatures and void fractions provides some guidance for designing an effective high-speed centrifugal pump.