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为了研究叶轮叶片进口边位置对核主泵气-液两相流动特性的影响,设计3种不同进口边方案,并对不同方案下的气-液两相流动特性进行定常、非定常模拟。通过对结果的分析,发现核主泵叶片进口边适当前伸,在发生失水事故时有助于保持一回路压力边界的稳定性,但前伸也会加剧叶片扭曲程度,使叶片吸力面气泡大量堆积;叶片进口边向后偏移,易在叶轮出口处产生较强的射流尾迹,引起较大幅度的压力脉动。经过比较分析,确定方案B为最优方案。在模拟基础上,对试验样机进行不同进口含气率工况下的外特性性能测试,测试结果表明:在进口含气率为0%的工况下,模拟数据与试验数据吻合性较好,泵性能达到设计要求;随着含气率的增加,试验值与模拟值出现较大的偏差,主要由于试验条件所限及模拟结果与试验结果的误差所导致。
In order to study the influence of inlet position of impeller blade on the gas-liquid two-phase flow characteristics of nuclear main pump, three different schemes of inlet sides were designed and the steady-state and unsteady flow characteristics of gas-liquid two-phase flow under different schemes were simulated. Through the analysis of the results, it is found that the inlet edge of the nuclear main pump impeller is properly prolonged, which helps to maintain the stability of the primary pressure boundary in the event of water loss accident. However, the extension of the forearm also aggravates the degree of distortion of the blade, Accumulation; leaves imported edge backward, easy to produce a strong jet at the exit of the impeller, causing more significant pressure pulsation. After comparative analysis, to determine the optimal program B. On the basis of the simulation, the test of external characteristic performance of the test prototype under different inlet gas content conditions shows that the simulation data are in good agreement with the experimental data under the conditions of 0% gas inlet, The performance of the pump meets the design requirements. With the increase of gas content, the deviation of the test value from the simulated value is mainly due to the limitation of the test conditions and the error of the simulation result and the test result.