CAJ | 학술논문

为研究核电站离心式上充泵的空化特性，专门研制了首级样机。应用 PRO／E 和 ICEM分别对水力部件进行三维造型和网格划分。将空化细分成空化初生，空化发展，临界空化和断裂空化四个阶段。基于 SST k －ω湍流模型，采用 ANSYS CFX 进行了空化数值模拟。结果表明：伴随着空化的发生，叶轮内沿径向位置的汽泡数量迅速增加，汽泡体积分数也越来越大。空化发生到一定程度时，叶轮内出现漩涡并且面积不断增加。空化初生时的压力脉动较为规律，叶轮与蜗壳动静干涉起主要作用；随后空化逐渐成为控制泵内部压力脉动规律的主要因素。最大流量工况点模拟值与试验值的扬程误差为2．1％，汽蚀余量误差为3．5％。数值计算结果与试验结果的变化趋势相同，揭示了上充泵在不同空化状态下的内部流场变化规律。
위연구핵전참리심식상충빙적공화특성，전문연제료수급양궤。응용 PRO／E 화 ICEM분별대수력부건진행삼유조형화망격화분。장공화세분성공화초생，공화발전，림계공화화단렬공화사개계단。기우 SST k －ω단류모형，채용 ANSYS CFX 진행료공화수치모의。결과표명：반수착공화적발생，협륜내연경향위치적기포수량신속증가，기포체적분수야월래월대。공화발생도일정정도시，협륜내출현선와병차면적불단증가。공화초생시적압력맥동교위규률，협륜여와각동정간섭기주요작용；수후공화축점성위공제빙내부압력맥동규률적주요인소。최대류량공황점모의치여시험치적양정오차위2．1％，기식여량오차위3．5％。수치계산결과여시험결과적변화추세상동，게시료상충빙재불동공화상태하적내부류장변화규률。
In order to study cavitation characteristics of a centrifugal charging pump in nuclear power plant,the first prototype was specially made.Software Pro /E and ICEM were respectively used to perform three-dimensional modeling and meshing for the hydraulic machinery.The cavitation was divided into four stages of cavitation inception,cavitation development,critical cavitation and fracture cavitation.Based on SST k-ωturbulence model,the cavitation numerical simulation was done with ANSYS CFX software.The results showed that with the occurrence of cavitation,the number of bubbles at the radial position in an impeller increases rapidly,and the bubble volume fraction also grows when cavitation occurs to a certain extent,vortex appears in the impeller and its area constantly increases;pressure pulsation is regular during cavitation inception,the dynamic and static interferences of the impeller and the volute play a main role;then cavitation gradually becomes the main factor to control pump pressure fluctuation rules;under the maximum flow rate condition,the head error between simulation results and test ones is 2.1% and NPSH error is 3.5%;the variation trends of numerical results and test ones are the same and they reveal varying laws of the internal flow field of the charging pump under different cavitation conditions.