CAJ | 학술논문

为研究叶片包角对离心泵作透平瞬态水力径向力的影响，以一台蜗壳式离心泵反转作透平为研究对象，保持叶轮和蜗壳其他几何参数不变，应用计算流体力学软件 CFX 对泵作透平全流道内多工况瞬态流动特性进行数值计算，并对预测性能进行了试验验证。结果表明，作用在叶轮上的径向力，当叶片包角增加超过一定值时小流量工况下减小不明显，而大流量下减小显著。随包角增加，作用于蜗壳上的径向力减小并向第四象限偏移。叶片包角存在一个合适的取值范围，使得泵作透平运行在大流量工况下时径向力较小。
위연구협편포각대리심빙작투평순태수력경향력적영향，이일태와각식리심빙반전작투평위연구대상，보지협륜화와각기타궤하삼수불변，응용계산류체역학연건 CFX 대빙작투평전류도내다공황순태류동특성진행수치계산，병대예측성능진행료시험험증。결과표명，작용재협륜상적경향력，당협편포각증가초과일정치시소류량공황하감소불명현，이대류량하감소현저。수포각증가，작용우와각상적경향력감소병향제사상한편이。협편포각존재일개합괄적취치범위，사득빙작투평운행재대류량공황하시경향력교소。
In order to study the effects of blade wrap angle on the radial force of a centrifugal pump as turbine,a single volute vaneless counter-rotating centrifugal pump was chosen as the research object.In the study,the blade wrap angle was varied from 100°to 115°and 130°,while the volute and other geometric parameters were kept constant.The transient flow characteristics under various operating conditions in the whole flow passage of the centrifugal pump as turbine were studied numerically by using the computational fluid mechanics software CFX.The results show that when the blade warp angle increases beyond a certain value,the radial force on the impeller reduces slightly at low flow rates and obviously at high flow rates.The radial force on the volute reduces and moves to the fourth quadrant as the blade warp angle increases.The blade warp angle should be within a suitable range to ensure a lower radial force level at higher flow rates.