冲击式水轮机性能换算的新理论提案(Ⅰ)  

A New Formula for Performance Conversion of Pelton Turbines (Ⅰ)

作　　者：韩凤琴[1] 久保田乔 韦彩新[1] 

机构地区：[1]华中理工大学动力工程系 [2]日本神奈大学工学部

出　　处：《华中理工大学学报》2000年第3期105-107,共3页Journal of Huazhong University of Science and Technology

基　　金：国家教委留学回国人员科研基金

摘　　要：对冲击式水轮机喷嘴内部单相流的壁面摩擦损失及喷嘴后气液二相自由射流 ,提出了新的性能换算相似准则 .除了考虑模型至真机的比能性能偏移影响外 ,还考虑了水轮机流量及动力换算的性能偏移 .指出了发生于多喷嘴冲击式水轮机射流干涉的强比尺效应 ,并说明了为实现对其进行预测 ,必须用 CFD定量地把握自由射流的衰减及水斗缺口的出流状况 .A new similarity law for the performance conversion of Pelton turbines is presented in consideration of the performance shift of the specific hydraulic energy of turbine from a model to its prototype. The performance shifts of turbine discharge and output power are also considered. The jet interference in multi nozzle Pelton turbines accompanied by the strong scale effect is explained. Before predicting the jet interference, we should know that the stream wise decay of free jet as well as the discharge from the cutout of buckets by using the CFD for Pelton buckets

关 键 词：冲击式水轮机 性能换算 射流干涉 比尺效应 

分 类 号：TK735[交通运输工程—轮机工程]