CAJ | 학술논문

为提高离心泵的汽蚀性能,利用CFD数值模拟分析与实验研究相结合的方法对长短叶片离心泵在不同汽蚀余量时叶轮内部气液两相的分布规律进行分析研究,分析了3种不同短叶片进口直径在不同汽蚀工况时气泡分布情况对叶轮内部流动和性能的影响。分析结果表明：选择合理短叶片的进口直径可以有效提高离心泵的抗汽蚀性能,避免叶轮进口堵塞和流道内发生漩涡汽蚀。当汽蚀余量减小到一定程度,离心泵短叶片进口直径为0.65D2（D2为叶轮外径）时,在长叶片和短叶片的背面都会出现漩涡汽蚀区;当离心泵短叶片进口直径为0.75D2时,在长叶片背面与短叶片工作面间的流道内会出现两个漩涡汽蚀区;当离心泵短叶片进口直径为0.85D2时,离心泵的抗汽蚀性能最佳。
위제고리심빙적기식성능,이용CFD수치모의분석여실험연구상결합적방법대장단협편리심빙재불동기식여량시협륜내부기액량상적분포규률진행분석연구,분석료3충불동단협편진구직경재불동기식공황시기포분포정황대협륜내부류동화성능적영향。분석결과표명：선택합리단협편적진구직경가이유효제고리심빙적항기식성능,피면협륜진구도새화류도내발생선와기식。당기식여량감소도일정정도,리심빙단협편진구직경위0.65D2（D2위협륜외경）시,재장협편화단협편적배면도회출현선와기식구;당리심빙단협편진구직경위0.75D2시,재장협편배면여단협편공작면간적류도내회출현량개선와기식구;당리심빙단협편진구직경위0.85D2시,리심빙적항기식성능최가。
To improve the cavitations performance of centrifugal pumps, using the combination of CFD numerical simulation and experimental study on the long blade and short blade centrifugal pump and vapor--liquid two--phase rules inside the impeller were analyzed in different NPSH, and the effect of three different short blades in different cavitations conditions on the impeller internal flow and performance was analysed. It is concluded： the selection of reasonable import diameter can im- prove the performance of anti--cavitation, while the NPSH fell to some degree, and centrifugal pump import diameter is 0.65D2, whirlpool cavitation zone appears on the back of long blade and short blade;while centrifugal pump import diameter is 0.75D2, there are two whirlpool cavitation zones on the back of long blade and short blade;it has worked best with anti--cavitation performance that the centrifugal pump import diameter is 0.85D2.