离心泵叶轮设计

A12345678910111213141516171819轮毂尺寸202122232425262728293031323334353637383940414243444546BC项目基本参数流量扬程效率转数公式Q比转数HN初定VsVs=2--3.5实取泵进口直径确定泵进出口直径泵进口速度泵出口速度泵出口直径汽蚀转数泵汽蚀转数进水轮毂初步确定叶轮主要尺寸高效不抗汽蚀:C=600--800,k=4进口系数高汽蚀性能:C=1000--1600,k=5兼顾汽蚀与效率:C=800--1000,k=4.5进口当量直径进口直径实取进口直径叶轮出口宽度实取叶轮外径实取3/43.65sHnQn4sQDVsmin0.7dsDDmaxdsDDminmaxdddDD实取D24sQD24dQDhd3/45.62nQCNPSHr300QDKn220()jhDDd5620.64()100sbnK322bQbKn321.3()100sbnK322bQbKn29.35/()100sDnK322dQDKn2b4748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293初步确定叶轮主要尺寸叶片出口角叶片进口角叶片进口直径实取叶片数实取出口圆周速度叶片出口厚度叶片与盖板的夹角叶片出口排挤系数叶轮外径精算准备斯脱道拉斯脱道拉滑移系数有限叶片理论扬程出口轴面速度叶片圆周厚度绝对速度圆周分量威斯奈威斯奈滑移系数绝对速度圆周分量有限叶片理论扬程有限叶片理论扬程取三种算法理论扬程平均值理论扬程修正系数经验系数∂∂=0.6导叶式压水室∂=0.65-0.85蜗壳式压水室∂=0.85-1.00蜗壳式压水室有限叶片数修正系数普夫莱德尔出口圆周速度精算叶轮外径第一次无穷叶片理论扬程出口直径2b1b10.85jDD2121216.5()2bbDDZSinDD22260Dnu2902212cot1()sinbuS1221uzSD2222mQvDb2sin1bz2222tanmuVVu21utuVHg20.7sin()bz2222(1)tanmuVVu22/tuHuVg/(10.08351lg)tQHHn2(1)60b。222222212()RRPzSZRR1(1)tHPH2222122()2tan2tanmmVVugH2260uDn949596979899100101102103104105106107108109110111精算叶轮外径第一次判断其是否合理?与假定不符,取出口直径叶片出口排挤系数出口轴面速度判断其是否合理?合理,取有限叶片数修正系数无穷叶片理论扬程精算叶轮外径第二次叶轮外径出口圆周速度2260uDn1221uzSD2222mQvDb222222212()RRPzSZRR1(1)tHPH2222122()2tan2tanmmVVugH2260uDnDE单位结果41531082%298050m81%r/minmmmmmmmmm/s3mm150.5215180221.2469754215m/sm/s3.1768668974.5324281584.50取960mmmm152.1961498mm152.1961498mm154mmmm15.54969536160.35918370612.147713530.45961940813.22289681mm448.71839774503/mh度度3220mm130.9150枚5.698668533枚6m/s70.212525mm5mm30.19541845度90m/s5.848509830.8718428840.85568502m/s39.682994170.14974624m/s39.29138258m281.5048145m284.3105327m315.1539108m379.64638540.71.073333333m442.003360.4025m/s76.7990095mm492.2135228m/smm492.2135228m5.4850132824760.878843063m/s417.65647910.32524606247674.25790331mm476.1546401