Impact of wall roughness on cavitating process in centrifugal pump
XU Weihui1, HOU Xiao1*, HU Meng2, HE Xiaoke1, WANG Weishu1
1.Thermal Engineering Research Center, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450045, China; 2.China Institute of Water Resources and Hydropower Research, Beijing 100038, China
Abstract：To study the effect of wall roughness on cavitating process in centrifugal pumps, the steady internal flow in a centrifugal pump was simulated numerically by using ANSYS CFX. The fluid domains of the pump were generated by using Pro/E software. The RNG k-ε turbulence model and Zwart′s cavitation model,which doesn′t consider non-condensable gas in water, were applied in simulations. The numerical simulations of flow in the pump were conducted under design flow condition. Then the influences of wall roughness on cavitation characteristic and internal flow pattern were analyzed by changing the wall roughness of the blades. The results showed that an increased roughness led to a decline in the pump head and efficiency but an increase in the shaft power.The degree of influence of roughness on the pump performance in the critical and local cavitation states is more significant than that in the subcritical and supercritical cavitation conditions. The effect of roughness on turbulent kinetic energy in the pump is similar to the influence on the development of cavitation.A reduced wall roughness has a significant effect on the improvement of centrifugal pump characteristics, when the inlet pressure is 81.06 kPa and 101.33 kPa.
徐维晖, 侯晓*, 胡孟, 何小可, 王为术. 粗糙度对离心泵空化过程的影响[J]. 排灌机械工程学报, 2018, 36(3): 197-203.
XU Weihui, HOU Xiao*, HU Meng, HE Xiaoke, WANG Weishu. Impact of wall roughness on cavitating process in centrifugal pump. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(3): 197-203.
[1]JOHANNF G. Centrifugal pumps [M]. 3 ed. Berlin: Springer, 2014.[2]KIM K H. CHAHINE G, FRANC J P, et al. Advanced experimental and numerical techniques for cavitation erosion prediction[M]. Berlin: Springer, 2013.[3]GRUBER P, ODERMAT T P, ETTERLIN M, et al. The detection of cavitation in hydraulic machines by use of ultrasonic signal analysis [J]. Earth and environmental science, 2014, 22(5): 5-14.[4]BRAZ J, CARDOSO F,CARLOS B. Incipient detection of cavitation phenomenon in centrifugal pumps[J].IEEE transactions on industry applications,2014, 50(1):120-126.[5]BRENNEN C E.空化与空泡动力学[M].王勇,潘中永,译.镇江:江苏大学出版社,2013.[6]MARZABADI F Rasi, SOLTANI M R. Effect of leading-edge roughness on boundary layer transition of an oscillating airfoil [J]. Scientia iranica(B), 2013, 20(3):508-515.[7]王勇,刘厚林,袁寿其,等.离心泵非设计工况空化振动噪声的试验测试[J].农业工程学报,2012, 28(2):35-38. WANG Yong, LIU Houlin, YUAN Shouqi, et al. Experimental testing on cavitation vibration and noise of centrifugal pumps under off-design conditions[J].Tran-sactions of the CSAE, 2012, 28(2): 35-38.(in Chinese)[8]刘东喜,庄宿国,王健,等.双吸泵的空化性能研究[J].中国农村水利水电,2013(2):117-121. LIU Dongxi, ZHUANG Suguo, WANG Jian, et al. Research on the cavitation performance of a double-suction pump[J]. China rural water and hydropower, 2013(2):117-121.(in Chinese)[9]FU Yanxia, YUAN Jianping,YUAN Shouqi, et al. Numerical and experimental analysis of flow phenomena in a centrifugal pump operating under low flow rates[J]. Journal of fluids engineering, 2015, 137:011102.[10]LU J, YUAN S, LUO Y, et al. Numerical and experimental investigation on the development of cavitation in a centrifugal pump[J]. Journal of process mechanical engineering, 2014, Doi: 10.1177//0954408914557877.[11]王秀礼,卢永刚,袁寿其,等. 基于流固耦合的核主泵汽蚀动力特性研究[J]. 哈尔滨工程大学学报,2015,36(2):213-217. WANG Xiuli, LU Yonggang, YUAN Shouqi, et al. Dynamic characteristics analysis of the reactor coolant pump variation based on fluid-structure coupling[J]. Journal of Harbin Engineering University, 2015,36(2):213-217.(in Chinese)[12]付强,袁寿其,蒋旭松,等. 离心式上充泵空化特性分析[J]. 振动与冲击,2015,34(15):82-87. FU Qiang, YUAN Shouqi, JIANG Xusong, et al. Cavitation characteristics analysis of a centrifugal charging pump [J]. Journal of vibration and shock, 2015,34(15): 82-87.(in Chinese)[13]范海峰, 范琪, 虞丹萍,等. 离心泵气蚀判定因素分析及预防[J]. 广州化工, 2011, 39(1):119-120. FAN Haifeng, FAN Qi, YU Danping, et al. Centrifugal pump cavitation determination factor analysis and its prevention [J]. Guangzhou chemical industry, 2011, 39(1): 119-120.(in Chinese)[14]冯建军,朱国俊,贺锐,等.表面粗糙度对轴流泵性能的影响[J].西北农林科技大学学报(自然科学版),2016,44(3):196-202. FENG Jianjun, ZHU Guojun, HE Rui, et al. Influence of wall roughness on performance of axial-flow pumps[J].Journal of Northwest A & F University(natural scie-nce edition), 2016,44(3): 196-202.(in Chinese)[15]谈明高,刘厚林,吴贤芳,等.粗糙度对离心泵性能数值预测的影响[J].中国农村水利水电,2011(2):131-134. TAN Minggao, LIU Houlin, WU Xianfang, et al. The effect of roughness on the numerical prediction of the characteristics of centrifugal pumps[J].China rural water and hydropower, 2011(2):131-134.(in Chinese)[16]赵斌娟,王瑜,陈汇龙,等.离心泵尾流射流现象及粗糙度对其影响的分析[J].农业机械学报,2014,45(9):138-143. ZHAO Binjuan, WANG Yu, CHEN Huilong, et al. Jet-wake flow in the channel of impeller and the effect of surface roughness on it[J].Transactions of the CSAM, 2014,45(9):138-143.(in Chinese)[17]邓育轩,纪燕飞,何立东,等.螺旋离心泵内不稳定漩涡空化对出口压力的影响[J].流体机械, 2017,45(8):43-47. DENG Yuxuan, JI Yanfei, HE Lidong, et al. Influence of unsteady vortex cavitation on pump outlet pressure in a centrifugal pump [J]. Fluid machinery, 2017, 45(8): 43-47.(in Chinese)[18]孙帅辉,黄益,郭鹏程, 等.涡旋液泵内部非稳态流场的数值模拟[J].流体机械, 2016, 44(4): 11-16. SUN Shuaihui, HUANG Yi, GUO Pengcheng, et al. Numerical simulation of the transient flow in a scroll hydraulic pump[J]. Fluid machinery, 2016,44(4):11-16.(in Chinese)
