文章摘要
王巍,陆鹏波,王晓放,戚光鑫,王一名.混流泵叶片优化及基于状态方程模型的空化研究[J].,2013,53(1):
混流泵叶片优化及基于状态方程模型的空化研究
Blade optimal design and cavitation investigation based on state equation model of mixed-flow pump
  
DOI：10.7511/dllgxb201301006
中文关键词: 混流泵  状态方程  临界空化余量  空化模型  优化设计
英文关键词: mixed-flow pump  state equation  critical net positive suction head  cavitation model  optimal design
基金项目:“九七三”国家重点基础研究发展计划资助项目(2009CB724303).
作者单位
王巍,陆鹏波,王晓放,戚光鑫,王一名  
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中文摘要:
      在保证效率和扬程的前提下,为了最大限度地提高混流泵空化性能,利用基于正压流体状态方程的空化模型,开展了混流泵空化性能研究．发现原来采用速度系数法设计的5叶片混流泵叶片结构并不合理,泵叶轮设计工况下的临界空化余量较高．针对这一问题,增加混流泵的叶片数目为7片,并以效率和扬程作为目标函数,对7叶片混流泵叶片进口边形状、叶片前缘厚度以及叶片厚度变化规律进行了优化设计．混流泵优化前后3种不同叶片结构方案的空化性能对比分析结果表明:混流泵叶片进口边适当向进口方向延伸,叶片进口边前缘减薄,以及改变叶片厚度的变化规律,将使混流泵的临界空化余量大大降低．优化设计后的混流泵效率为90.857%,扬程为163.86 m,优化后的临界空化余量为28.64 m,相比优化前降低了45%,有效地改善了混流泵在设计工况下的空化性能,为今后该类高温高压混流泵的设计和优化提供了方向．
英文摘要:
      While satisfying the precondition of the pump efficiency and head, the studies of cavitation performance of mixed-flow pump are carried out based on the cavitation model with the barotropic fluid state equation in order to prevent cavitations occurring as far as possible. The experimental results show that the mixed-flow pump with five blades, designed by velocity coefficient method, is not reasonable due to higher critical net positive suction head under design condition. Consequently, inlet edge shape and thickness of the pump impeller blades, and the variation of blades thickness along flowing direction are optimized using the pump efficiency and head as the objective functions after increasing the pump impeller blade number to seven. Cavitation performances among three types of mixed-flow pump with different blade structures are compared and analyzed. Some useful conclusions are conducted. The critical net positive suction head can be greatly reduced by extending the blade inlet toward the pump inlet properly, attenuating the blade inlet edge and optimizing the blade thickness. The optimized pump efficiency and head are 90.857% and 163.86 m respectively, and the critical net positive suction head reaches 28.64 m which is relatively reduced by 45% compared with that of the original pump with 5 blades. The effective improvement of the cavitation performance in the design condition provides helpful directions for further design and optimization of the mixed-flow pump.
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