用于确定双吸离心泵Suter曲线的三维内特性法研究

发布时间：2018-05-05 13:27

本文选题：泵站 + 双吸离心泵　；参考：《水利学报》2017年01期

【摘要】：水泵Suter曲线是泵站水锤分析的必备条件之一。现有用于获取双吸离心泵Suter曲线的实测法具有难度大、成本高的特点,而间接插值估算法的精度又比较低,本文提出了一种通过水泵流场三维数值计算确定双吸离心泵Suter曲线的新方法,简称三维内特性法。该方法采用计算流体力学(CFD)技术,对双吸离心泵的水力模型进行三维造型、工况离散、流场计算及结果转化,以快速、准确地获取双吸离心泵Suter曲线,在正水泵工况、正水轮机工况、反水轮机工况、反水泵工况等工况下,计算出相应流量、转速、扬程和转矩关系。定量分析表明,相比于间接插值估算法,采用三维内特性法获得的Suter曲线中,Wh(x)的计算精度平均提高了39.2%,Wb(x)的计算精度平均提高了26.3%;在将采用该方法获得的双吸离心泵Suter曲线用于事故停泵工况水锤分析时,计算得到的系统最大压力降低了15.0%,管线发生汽化压力的范围缩减了81.4%,双吸离心泵的最大倒流量增大了11.9%,最大倒转速降低了6.1%,与实际测试结果更为接近。该方法为提高双吸离心泵站水锤分析精度提供了一种新技术途径。
[Abstract]:Pump Suter curve is one of the necessary conditions for water hammer analysis in pumping station. The existing methods used to obtain the Suter curve of double suction centrifugal pump have the characteristics of difficulty and high cost, while the precision of indirect interpolation estimation method is relatively low. In this paper, a new method for determining the Suter curve of double suction centrifugal pump by three dimensional numerical calculation of pump flow field is presented, which is referred to as three dimensional internal characteristic method. In this method, the hydraulic model of double suction centrifugal pump is modeled by computational fluid dynamics (CFD) technique, the working condition is discrete, the flow field is calculated and the result is transformed, so that the Suter curve of double suction centrifugal pump can be obtained quickly and accurately in the positive pump condition. Under the working conditions of positive turbine, reverse turbine and reverse pump, the relationship among flow, speed, head and torque is calculated. Quantitative analysis shows that, compared with the indirect interpolation method, The accuracy of the Suter curve obtained by the three-dimensional internal characteristic method has been improved by 39.2% and 26.3.The double suction centrifugal pump Suter curve obtained by this method has been applied to the analysis of water hammer under the accident condition. The calculated maximum pressure of the system is reduced by 15.0, the range of vaporization pressure of the pipeline is reduced by 81.4, the maximum reverse flow of the double suction centrifugal pump increases by 11.9. the maximum inverted speed decreases by 6.1 percent, which is closer to the actual test results. This method provides a new technical way to improve the precision of water hammer analysis in double suction centrifugal pump station.
【作者单位】：中国农业大学水利与土木工程学院;北京市供水管网系统安全与节能工程技术研究中心;山东双轮股份有限公司;
【基金】：国家自然科学基金项目(51321001) “十二五”国家科技支撑计划项目(2015BAD20B01)
【分类号】：TV675

【参考文献】