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为研究核主泵的空化特性,基于ANSYS CFX软件,对现有Zwart-Gerber-Belamri空化模型进行热力学效应修正,在不同流量下采用修正前后的空化模型分别对模型核主泵进行数值计算,并将模拟值与试验值进行对比分析,验证了在核主泵空化发生时热力学效应修正的正确性。结果表明,未发生空化时,模型修正不具有明显影响,随着核主泵空化的加深,影响加大;模型泵空化性能的数值模拟预测与试验值趋势吻合,误差值在5.3%~9.6%之内,验证了空化数值模拟对核主泵工程应用中性能预测的可靠性;空化余量减小时,叶片低压区域从进口向出口扩张,随低压区域的扩张,汽泡填充整个流道,叶片载荷力降低,扬程下降。
In order to study the cavitation characteristics of the nuclear main pump, based on the ANSYS CFX software, the thermodynamic effects of the existing Zwart-Gerber-Belamri cavitation model were corrected. At different flow rates, the cavitation model before and after modification was used to conduct numerical Comparing the simulated value with the experimental value, the correctness of the thermodynamic effect correction when the nuclear main pump cavitation occurs is verified. The results show that the model correction does not have a significant effect when cavitation does not occur, and the impact increases with the cavitation of the nuclear main pump. The numerical simulation prediction of the cavitation performance of the model pump agrees well with the experimental value. The error value is 5.3% ~ 9.6%, the reliability of the numerical simulation of the performance of the nuclear main pump in engineering application is verified. When the cavitation allowance decreases, the low pressure region of the blade expands from the inlet to the outlet. With the expansion of the low pressure region, the bubble filling The entire runner, blade load force decreased, head down.