半高导叶端面间隙对离心泵水力性能影响的数值模拟与验证
发布时间：2017-12-31 19:40
本文关键词：半高导叶端面间隙对离心泵水力性能影响的数值模拟与验证 出处：《农业工程学报》2017年17期 论文类型：期刊论文
【摘要】：离心泵中存在各种间隙,其间隙流动极其复杂,易出现泄漏流、间隙涡等复杂湍流,影响离心泵的水力性能及运行稳定性。该文结合数值模拟与试验方法,采用SST k ω湍流模型,研究半高导叶端面间隙对离心泵水力性能及内部流场的影响规律,重点探讨半高导叶端面间隙对离心泵水力性能的影响机理。结果表明,适当的半高导叶端面间隙能有效改善离心泵水力性能,拓宽其高效区,导叶叶高为1.0时,最高效率点流量37.5 m3/h处,而导叶叶高为0~0.8时,其最高效率点流量42.5 m3/h处;导叶端面间隙为0.4~0.6导叶叶高时,离心泵的效率与扬程最优,且最大效率为57.5%;在0.6倍设计工况、0.8倍设计工况和1.0倍设计工况时,带半高导叶端面间隙的离心泵中叶轮做功和导叶内总压损失均高于普通导叶式离心泵,在0.6倍设计工况,导叶叶高为1.0时叶轮做功比导叶叶高为0~0.8时叶轮做功低将近7 m水头,且在0.6倍设计工况和0.8倍设计工况下,导叶叶高为0时导叶内总压损失平均值比导叶叶高为1.0时分别高6.66 m、4.62 m水头;在1.2倍设计工况和1.4倍设计工况时,其叶轮做功和导叶内总压损失均低于普通导叶式离心泵;在各流量工况下,带导叶端面间隙的离心泵中蜗壳内总压损失均小于普通导叶式离心泵;随着流量增加,带半高导叶端面间隙的离心泵中叶轮-导叶动静干涉作用在逐渐减弱,叶轮-蜗壳动静干涉作用逐渐凸显。研究结果为离心泵导叶优化设计提供参考。
[Abstract]:There are various clearances in the centrifugal pump, the clearance flow is extremely complex, the leakage flow, clearance vortex and other complex turbulence, which affect the hydraulic performance and operational stability of the centrifugal pump. This paper combines the numerical simulation and test methods. The effect of the end clearance of semi-high guide vane on the hydraulic performance and internal flow field of centrifugal pump was studied by using the SST Ki 蠅 turbulence model. The influence mechanism of the end clearance of semi-high guide vane on the hydraulic performance of centrifugal pump is discussed. The results show that the proper end clearance of semi-high guide vane can effectively improve the hydraulic performance of centrifugal pump and widen its high efficiency area. When the height of the guide blade is 1.0, the flow rate of the highest efficiency point is 37.5 m3 / h, and when the height of the guide blade is 0 ~ 0.8, the flow rate of the highest efficiency point is 42.5 m3 / h. The efficiency and lift of centrifugal pump are optimal when the end clearance of guide vane is 0.4 ~ 0.6 and the maximum efficiency is 57.5; At 0.6 times design condition, 0.8 times design condition and 1.0 times design condition, the work of impeller and total pressure loss of guide vane in centrifugal pump with semi-high clearance of guide vane end face are higher than that of ordinary guide vane centrifugal pump. When the guide blade height is 1.0, the work of the impeller is nearly 7 meters lower than that of the guide vane when the height of the guide vane is 0 ~ 0.8, and under 0.6 and 0.8 times design conditions. When the height of the guide blade is 0:00, the average of the total pressure loss of the guide blade is 6.66 m and 4.62 m higher than that of the guide blade when the height of the guide blade is 1.0; When the design conditions are 1.2 times and 1.4 times, the impeller work and the total pressure loss of the guide vane are lower than that of the ordinary guide vane centrifugal pump. Under each flow condition, the total pressure loss in the volute of the centrifugal pump with guide vane end clearance is smaller than that of the ordinary guide vane centrifugal pump. With the increase of flow rate, the impeller-guide blade static and static interference in centrifugal pump with semi-high clearance of guide vane is gradually weakened. The effect of impeller-volute dynamic and static interference is becoming more and more prominent. The results provide a reference for the optimization design of centrifugal pump guide vane.
【作者单位】： 西北农林科技大学水利与建筑工程学院;
【基金】：国家自然基金(51479173,51509209) 西北农林科技大学科研启动经费(Z109021642) 陕西水利科技计划项目(2017slkj-5) 中央高校基本科研业务费专项资金项目(Z109021705)
【分类号】：TH311
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本文编号：1361206
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