水電站課程設(shè)計(jì)計(jì)算書

1、水電站廠房課程設(shè)計(jì)計(jì)算書水電站廠房課程設(shè)計(jì)計(jì)算書1蝸殼單線圖的繪制蝸殼單線圖的繪制1.11.1蝸殼的型式蝸殼的型式根據(jù)給定的基本資料和設(shè)計(jì)依據(jù)，電站設(shè)計(jì)水頭Hp=46.2m，水輪機(jī)型號：HL220LJ225。可知采用金屬蝸殼。又Hp=46.2m40m，滿足《水電站》（第4版）P32頁對于蝸殼型式選擇的要求。1.21.2蝸殼主要參數(shù)的選擇蝸殼主要參數(shù)的選擇金屬蝸殼的斷面形狀為圓形，根據(jù)《水電站》（第4版）P35頁可知：為了獲得良好的水力性

2、能及考慮到其結(jié)構(gòu)和加工工藝條件的限制，一般取蝸殼的包角為。0345???通過計(jì)算得出最大引用流量值，計(jì)算如下：maxQ水輪機(jī)額定出力：式中：○115000156250.96frfNNKW????，。60000150004fKWNKW??0.96f??（水○231max3322221156251.111.159.819.812.2546.20.904rpNQmsDH????????輪機(jī)在該工況下單位流量由表36查得）。3111.15MQQ

3、ms???！?223max1max11.112.2546.238.2rQQDHms?????由蝸殼進(jìn)口斷面流量，得。max0360cQQ???334538.236.61360cQms?????蝸殼進(jìn)口斷面平均流速由《水電站》（第4版）P36頁圖28（a）查得，Vc。5.6cVms?由《水力機(jī)械》第二版，水利水電出版社）附錄二表5查得：，則32503850baDmmDmm??16251.62519251.925barmmmrmmm????

4、。其中：—座環(huán)內(nèi)徑；—座環(huán)外徑；—座環(huán)內(nèi)半徑；—座環(huán)外半徑。bDaDbrar座環(huán)示意圖如下圖所示：23150.2971.1421.0681.3654.65533000.2821.0871.0431.3254.57542850.2681.0331.0161.2854.49452700.2540.9790.9891.2434.41262550.2400.9240.9611.2014.32872400.2260.8700.9331.1594.

5、24282250.2120.8150.9031.1154.15592100.1980.7610.8721.0704.065101950.1840.7070.8411.0243.974111800.1690.6520.8080.9773.879121650.1550.5980.7730.9293.782131500.1410.5440.7370.8793.682141350.1270.4890.6990.8273.578151200.11

6、30.4350.6590.7723.470161050.0990.3810.6170.7163.35617900.0850.3260.5710.6563.23718750.0710.2720.5210.5923.10919600.0560.2170.4660.5232.97120450.0420.1630.4040.4462.81721300.0280.1090.3300.3582.64122150.0140.0540.2330.247