摘要
为了提升污水泵叶轮的性能,本文基于响应面法对叶轮的三个主要设计参数进行三因素三水平优化。通过对比优化模型和原模型的性能曲线发现,优化模型的扬程、效率优于原模型,优化模型拥有更高的高效区间,优化模型的内部流场低压区要小于原模型,流场内部流动更为均匀。利用熵产理论分析了污水泵不同工况下的能量损失,结果表明:优化模型在叶轮内的各工况熵产要明显小于原模型,在蜗壳内的熵产分布相差不大;在小流量工况下,熵产率较高区域主要集中在叶片压力侧和叶片出口附近;随着流量的增大,流动损失逐渐减小,高熵产区向蜗壳出口及隔舌处转移,叶轮和蜗壳的动静干涉及蜗壳壁面高速流的冲击回流,造成了泵内的主要能量损失。原模型的熵产分布和优化模型较为一致,但其高熵产区域要明显大于优化模型,且数值更大。
To improve the performance of sewage pump impellers,this study applies a response surface model to optimizing the three main design parameters of the impellers based on the orthogonal tests of three factors and three levels.Comparison of the external characteristic curves between the optimized model and the original model reveals that relative to the latter,the former has a wider head range,a higher efficiency,and a wider high efficiency range;it is featured with smaller low-pressure zones of smoother and more even internal flows.The energy loss of the pump under different working conditions is calculated using the entropy generation theory.The results show that entropy production in the impeller of the optimized model is significantly lower,while its distribution pattern in the volute is not much different from that of the original model.At low flows,the zones with a high entropy production rate are mainly concentrated on the pressure side of the blades and near the blade outlet;as the flow increases,the energy loss gradually decreases and the high entropy production zones shift to the volute outlet and the diaphragm.The dynamic and static dryness of the volute involves the impinging and return of high-speed water jets on the volute wall,causing the major part of energy loss in the pump.It is found that the entropy generation distribution of the original model follows a pattern similar to that of the optimized model,while the high entropy generation zones and the generation rate are both significantly larger.
作者
蒋登辉
周佩剑
王磊
吴登昊
牟介刚
JIANG Denghui;ZHOU Peijian;WANG Lei;WU Denghao;MOU Jiegang(College of Metrology&Measurement Engineering,China Jiliang University,Hangzhou 310018;Huadian Electric Power Research Institute Co.,Ltd.,Hangzhou 310030)
出处
《水力发电学报》
CSCD
北大核心
2021年第11期72-82,共11页
Journal of Hydroelectric Engineering
基金
浙江省公益技术研究计划/工业(LGG21E090003,LGG21E090002)
浙江省大学生科技创新活动计划(2020R409046)。
关键词
响应面
污水泵
数值计算
外特性曲线
熵产分析
response surface
sewage pump
numerical calculation
external characteristic curve
entropy production analysis
