Effect of inducer deflection angle on impeller cavitation performance in centrifugal pump
LI Rennian1,2, BI Zhen1, LI Yibin1,2, XIAO Liqian1
1.School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Key Laboratory of Fluid Machinery and Systems, Gansu Province, Lanzhou, Gansu 730050, China
Abstract：In order to clarify the effect of inducer deflection on cavitation performance of centrifugal pump impeller, improve centrifugal pump cavitation performance, and get the best circumferential position, based on the homogeneous flow assumption, the IDM cavitation model and the RNG k-ε turbulence model were adopteed and five projects which deflections are 0°,10°,20°,30°,40° and 50° were selected,to compare numerical simulation values and experimental values of pump′s external characteristics and cavitation performances of inducer and impeller. The centrifugal pump characteristic performance data of different projects were obtained. Calculated NPSHR curves match well with experimental ones, which can verify the accuracy of the calculation methods. Based on numerical simulation results, vapor volume fraction distributions within inducer and impeller blades under various conditions were analyzed.It was found that cavitation bubbles′ development processes and rates of 10° and 20°positions are basically the same, but the cavitation rate and vapor volume fraction distribution areas are smaller when the deflection is 10°, therefore two deflectians of 5° and 15° were further selected to do simulation analysis to get more accurate results, i.e. the pump′s overall hydraulic characteristic is the best when the deflection is 5°.
李仁年,, 毕祯, 黎义斌,, 肖丽倩. 诱导轮偏转角对离心泵叶轮空化性能的影响[J]. 排灌机械工程学报, 2016, 34(6): 461-469.
LI Rennian,, BI Zhen, LI Yibin,, XIAO Liqian. Effect of inducer deflection angle on impeller cavitation performance in centrifugal pump. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(6): 461-469.
[1]关醒凡.现代泵理论与设计[M].北京:中国宇航出版社, 2009.[2]ANGELO Pasini, LUCIO Torre, ANGELO Cervone, et al. Continuous spectrum of the rotordynamic forces on a four bladed inducer[J]. Journal of fluids engineering,2011,133(11):1-9.[3]KANG Donghyuk, YOKOTA Kazuhiko. Analytical study of cavitation surge in a hydraulic system[J]. Journal of fluids engineering-transaction of the ASME, 2014, 136(10):1011031-10110310.[4]QIU N, WANG L Q,KONG F Y. Research on cavitation characteristic of inducer[J]. Materials science and engineering, 2013,52(6):668-672,[5]郭晓梅,李昳,崔宝玲, 等. 前置不同诱导轮高速离心泵旋转空化特性研究[J].航空学报,2013,34(7):1572-1581. GUO Xiaomei, LI Yi, CUI Baoling, et al. Research on the rotation cavitation performance of high-speed rotation centrifugal pump with different pre-positioned inducers[J]. Acta aeronautica et astronautica sinica, 2013, 34(7):1572-1581.(in Chinese)[6]宋沛原,李家文,唐飞. 轮毂形状对诱导轮性能的影响[J].火箭推进,2012,38(2):38-43. SONG Peiyuan, LI Jiawen, TONG Fei. Effect of hub shape on performance of inducer[J]. Journal of rocket propulsion,2012,38(2):38-43.(in Chinese)[7]崔宝玲,朱祖超,林勇刚. 等螺距诱导轮内部流动的数值模拟[J].机械工程学报,2010,46(6):158-163. CUI Baoling, ZU Zhuchao, LIN Yonggang. Numerical simulation of inner flow in equal-pitch inducer[J]. Journal of mechanical engineering, 2010,46(6):158-163.(in Chinese)[8]DUPONT P, OKAMURA T, DUPONT P, et al. Cavitating flow calculations in industry[J]. International journal of rotating machinery, 2003, 9(3): 163-170.[9]LIU Jintao, LIU Shuhong, WU Yulin, et al. Numerical investigation of the hump characteristic of a pump-turbine based on an improved cavitation model[J]. Computers and fluids, 2012, 68: 105-111.[10]SINGHAL A K, ATHAVALE M M, LI H Y, et a1.Mathematical basis and validation of the full cavitation model[J]. Journal of fluids engineering, 2002, 124(9): 617-624.[11]袁寿其,施卫东,刘厚林,等.泵理论与技术[M].北京:机械工业出版社, 2014.[12]张仁田,岳修斌,朱红耕,等. 基于CFD的泵装置性能预测方法比较[J].农业机械学报,2011,42(3): 85-90. ZHANG Rentian, YUE Xiubin, ZHU Honggeng, et al. Comparison on performance prediction methodologies of low-head pump systems based on CFD[J]. Transactions of the CSAM,2011, 42(3): 85-90.(in Chinese)[13]周俊杰,徐国权,张华俊.Fluent工程技术与实例分析[M]. 北京:中国水利水电出版社,2010.[14]LIU Houlin, WANG Yong, LIU Dongxi, et al. Assessment of a turbulence model for numerical predictions of sheet-cavitating flows in centrifugal pumps[J].Journal of mechanical science and technology,2013,27(9):2743-3750.[15]王福军.计算流体动力学分析——CFD软件原理与应用[M].北京:清华大学出版社,2011.[16]LEE Changjin, ROH Tae-Seong. Flow instability due to cryogenic cavitation in the downstream of orifice[J]. Journal of mechanical science and technology,2009,23(3):643-649.[17]邴浩,曹树良,王玉川.湍流模型对混流泵性能预测的影响[J].农业机械学报,2013,44(11):42-47. BING Hao, CAO Shuliang, WANG Yuchuan. Influence of turbulence model on performance prediction of mixed-flow pump[J]. Transactions of the CSAM, 2013,44(11):42-47.(in Chinese)[18]孔繁余, 张洪利, 张旭峰, 等. 基于空化流动数值模拟的变螺距诱导轮设计[J]. 排灌机械工程学报, 2010,28(1):12-17. KONG Fanyu, ZHANG Hongli, ZHANG Xufeng, et al. Design on variable-pitch inducer based on numerical simulation for cavitation flow[J]. Journal of drainage and irrigation machinery engineering, 2010,28(1):12-17.(in Chinese)[19]潘中永,袁寿其.泵空化基础[M].镇江:江苏大学出版社,2013.[20]NAOKI Tani, NOBUHIRO Yamanishi, YOSHINOBU Tsujimoto. Influence of flow coefficient and flow structure on rotational cavitation in inducer[J]. Journal of fluids engineering, 2012,134:1-13.[21]罗先武,张瑶,彭俊奇,等. 叶轮进口几何参数对离心泵空化性能的影响[J].清华大学学报(自然科学版),2008,48(5):836-839. LUO Xianwu, ZHANG Yao, PENG Junqi, et al. Effect of impeller inlet geometry on centrifugal pump cavitation performance[J]. Journal of Tsinghua University(science and technology), 2008,48(5):836-839.(in Chinese)[22]杨孙圣,孔繁余,周水清,等. 离心泵气蚀性能的数值计算与分析[J].华中科技大学学报(自然科学版),2010,38(10):93-95. YANG Sunsheng, KONG Fanyu, ZHOU Shuiqing, et al. Numerical simulation and analysis of centrifugal pump cavitation[J]. J.Huazhong Univ. of Sci. & Tech.(natural science edition), 2010,38(10):93-95.(in Chinese)[23]张永学,宋鹏飞,许聪,等.预旋调节对离心泵空化影响的试验与数值模拟[J].农业机械学报,2014,45(9):131-137. ZHANG Yongxue, SONG Pengfei, XU Cong, et al. 3D dynamic characteristics of rotor system of pump storage generator set[J]. Transactions of the CSAM,2014, 45(9):131-137.(in Chinese)
