Abstract：According to the structure characteristics of impeller of a screw centrifugal pump, the streamwise evolutionary pattern of blade pitch was analyzed by applying the theory of relative velocity ratio of liquidsolid twophase flow model for an impeller pump, and then a parametric equation for variablepitch was deduced. For the given hydraulic performance parameters and a volume fraction of the solid phase at the design point, a smooth, threedimensional blade profile could be established through the parametric equations.The water performance of a screw centrifugal pump whose blades were designed in that way was measured, and accordingly its performances of liquidsolid twophase flow were estimated numerically at three volume fractions of 5%, 15% and 25% with a CFD code, respectively. The results show that the pump efficiency for transporting solidliquid twophase medium is better than for transporting water. At the design point, for a given volume fraction of solid phase, the pump efficiency is increased by 8.5%; however, when the volume fraction is different from that given value, the pump efficiency is reduced.Compared with water single phase flow, the pump head of liquidsolid twophase flow is not only decreased, and but also lowered gradually with increasing solidphase concentration.
参考文献(References)［1］李仁年,刘成胜,王秋红. 影响螺旋离心泵扬程的因素分析［J］.兰州理工大学学报,2005,31(1):53-56.Li Rennian, Liu Chengsheng, Wang Qiuhong. Analysis of influencing factors on the head of screw centrifugal pump［J］. Journal of Lanzhou University of Technology,2005,31(1):53-56. (in Chinese)［2］李仁年, 李兵, 韩伟. 螺旋离心泵工作特性理论分析［J］. 农业机械学报,2005,36(6):51-53.Li Rennian, Li Bing, Han Wei. Analysis on working characteristics of screw centrifugal pump［J］. Transaction of the Chinese for Agricultural Machinery, 2005,36(6):51-53. (in Chinese)［3］刘成胜, 李仁年. 螺旋离心泵的外特性试验与流场数值分析［J］. 火箭推进,2005, 31(5):18-24.Liu Chengsheng, Li Rennian. Experimental investigation of exterior performances and numerical analysis of flow field in a helix centrifugal pump［J］.Journal of Rocket Propulsion, 2005, 31(5):18-24. (in Chinese)［4］关醒凡.现代泵理论与设计［M］.北京:中国宇航出版社, 2011:408-412.［5］王秋红,刘成胜,朱孝明.提高螺旋离心泵性能的措施研究［J］.华电技术,2008,30(11):8-10.Wang Qiuhong, liu Chengsheng, Zhu Xiaoming. Research on the performance of the screw centrifugal pump［J］. Huadian Technology, 2008,30(11):8-10. (in Chinese)［6］李仁年,苏吉鑫,韩伟,等.螺旋离心泵叶轮叶片型线方程［J］. 排灌机械, 2007,25(3):7-11.Li Rennian, Su Jixin, Han Wei, et al. Profile equations for impeller vane of screw centrifugal pump［J］. Drainage and Irrigation Machinery, 2007,25(3):7-11. (in Chinese)［7］李仁年,陈冰,韩伟,等.变螺距螺旋离心泵叶片型线参数方程的分析［J］.排灌机械,2007,25(6):1-3.Li Rennian, Cheng Bing, Han Wei, et al. Analysis of vane profile parameter equation for variable pitch［J］. Drainage and Irrigation Machinery, 2007, 25(6):1-3. (in Chinese)［8］齐学义,阎晓伟,姬孝斌,等.双流道污水泵内固相体积分数分布规律［J］. 江苏大学学报:自然科学版,2009, 30(2):156-159.Qi Xueyi, Yan Xiaowei, Ji Xiaobin, et al. Volume fraction distribution rules for solidphase in double channel sewage pump ［J］. Journal of Jiangsu University:Natural Science Edition, 2009, 30(2):156-159. (in Chinese)［9］Mehta M, Kadambi J R, Sastry S, et al. Particle velocities in the rotating impeller of slurry pump［C］／／Proceedings of the 5th Joint ASME／JSME Fluids Engineering Conference,2007:1-10.［10］Sequeira Yoshimi Watanabe, Hiroyuki Eryu, Tetsuya Yamamoto. Effects of platelet size and mean volume fraction on platelet orientation and volume fraction distributions in functionally graded material fabricated by a centrifugal solidparticle method［J］. Journal of Engineering Materials and Technology, 2007, 129 (2):304-312.
