CAJ | 학술논문

为研究和改善核电站离心式上充泵首级叶轮空化性能，采用数值模拟方法进行优化分析。将叶片数改为4片，研究了泵的最佳空化性能、扬程和效率。结果表明，最大流量工况点扬程模拟值与试验值的相对误差为2.9％，空化余量相对误差为3.6％，试验结果和模拟结果相吻合。将空化细分为初生空化、发展空化、临界空化、严重空化和断裂空化5个阶段，分析表明：初生空化时汽泡首先出现在叶片进口背面处，临界空化状态以后叶片工作面也开始出现汽泡；在发展空化到严重空化状态之间，空化和叶轮蜗壳动静干涉共同影响叶轮内的压力脉动规律；严重空化状态之后，空化成为主要影响因素，压力脉动变得相对稳定，叶轮进口和中部的压力脉动幅值明显减小，但叶轮出口处仍然保持较高幅值且比较规律的压力脉动。
위연구화개선핵전참리심식상충빙수급협륜공화성능，채용수치모의방법진행우화분석。장협편수개위4편，연구료빙적최가공화성능、양정화효솔。결과표명，최대류량공황점양정모의치여시험치적상대오차위2.9％，공화여량상대오차위3.6％，시험결과화모의결과상문합。장공화세분위초생공화、발전공화、림계공화、엄중공화화단렬공화5개계단，분석표명：초생공화시기포수선출현재협편진구배면처，림계공화상태이후협편공작면야개시출현기포；재발전공화도엄중공화상태지간，공화화협륜와각동정간섭공동영향협륜내적압력맥동규률；엄중공화상태지후，공화성위주요영향인소，압력맥동변득상대은정，협륜진구화중부적압력맥동폭치명현감소，단협륜출구처잉연보지교고폭치차비교규률적압력맥동。
In order to study and improve cavitation performance of the first stage impel‐ler of centrifugal charging pump in nuclear power plant ,the numerical simulation was used for optimization and analysis .The number of the blades was changed to 4 ,and the best cavitation performance ,the head and efficiency of pump were studied .The results show that in the maximum flow rate condition ,the relative error of head between simu‐lation and experimental results is 2.9% and the relative error of net positive suction head is 3.6% .The numerical results and experiment results are consistent .The cavita‐tion is divided into 5 stages:incipient cavitation ,developing cavitation ,critical cavitati‐on ,severe cavitation and fracture cavitation . The analysis results indicate that the bubbles appear firstly in the inlet of the blade suction surface in incipient cavitation and they appear in the blade pressure surface after critical cavitation . The cavitation and dynamic and static interference in the pump body affect pressure fluctuation in the impeller between developing cavitation and severe cavitation . The cavitation plays a main role after severe cavitation ,then pressure fluctuation becomes relatively stable and amplitudes of pressure fluctuation significantly reduce in the inlet and central part of the impeller , but pressure pulsation with relatively high amplitude and regularity still remains in the impeller outlet .