CAJ | 학술논문

为了揭示核主泵叶轮和导叶的流动干涉效应，采用相似换算法和多参数匹配法，基于RNG k-ε湍流模型与块结构化网格，对缩比系数为0.5的模型泵进行非定常数值模拟。结果表明：扬程脉动幅值与运行工况有关，额定工况时扬程脉动的幅值最小，偏离最优工况时，扬程脉动幅值逐渐增大。导叶内部流道产生不稳定的流量脉动效应，大于0.8Qd工况时，导叶内流量脉动瞬态效应不明显；小于0.8Qd工况时，导叶内流量脉动趋于不稳定。考虑到机组的水力稳定性，运行工况应大于0.8Qd。动静干涉使导叶内静压分布呈现周期性脉动，导叶压力面平均脉动幅值最大，吸力面平均脉动幅值最小，压力脉动的周期与叶轮叶片数有关；导叶内静压分布与叶轮尾缘和导叶前缘相对位置有关，叶轮尾缘对导叶入口流动的阻塞效应，是诱发导叶内静压脉动的主要原因。
위료게시핵주빙협륜화도협적류동간섭효응，채용상사환산법화다삼수필배법，기우RNG k-ε단류모형여괴결구화망격，대축비계수위0.5적모형빙진행비정상수치모의。결과표명：양정맥동폭치여운행공황유관，액정공황시양정맥동적폭치최소，편리최우공황시，양정맥동폭치축점증대。도협내부류도산생불은정적류량맥동효응，대우0.8Qd공황시，도협내류량맥동순태효응불명현；소우0.8Qd공황시，도협내류량맥동추우불은정。고필도궤조적수력은정성，운행공황응대우0.8Qd。동정간섭사도협내정압분포정현주기성맥동，도협압력면평균맥동폭치최대，흡력면평균맥동폭치최소，압력맥동적주기여협륜협편수유관；도협내정압분포여협륜미연화도협전연상대위치유관，협륜미연대도협입구류동적조새효응，시유발도협내정압맥동적주요원인。
In order to reveal flow interference effects of impeller and guide vane of a nuclear main pump, adopting similar conversion algorithm and multiple parameters matching method, based on RNGk-ε turbulence model and block structured grids, unsteady numerical simulation was carried on the model pump whose shrinkage coefficient is 0.5. The results show that the pulsation amplitude of the head is related to operating conditions, the minimal value is on the rated condition, and it will gradually increase when the working condition deviate from the optimal point. The unstable flow pulsation effect appears in the inner flow passage of the guide vane, the transient effect of the flow pulsation of the inside guide vane is not obvious when the working condition is above 0.8Qd,; the flow pulsation within the guide vane tends to be unstable when the working condition is under 0.8Qd,. Considering the hydraulic stability of the unit, working condition should be above 0.8Qd. Rotor-stator interaction induces periodic pulsation of the guide vane static pressure distribution, the average pulsation amplitude on the pressure side is maximum,and the suction side is minimum. The pressure pulsation period is related to the impeller blade number. Theguide vane static pressure distribution is related to the relative position of the impeller trailing edge and the guide vane leading edge; the impeller trailing edge caused the blockage effect on the guide vane inlet flow, and it’s the main reason causes the guide vane static pressure pulsation.