課程設(shè)計(jì)指導(dǎo)書(shū)-軸流泵葉輪水力設(shè)計(jì)

1、1軸流泵葉輪葉片軸流泵葉輪葉片設(shè)計(jì)設(shè)計(jì)1軸流泵葉輪水力模型設(shè)計(jì)參數(shù)............................................................................................22葉輪設(shè)計(jì)流程.......................................................................................

2、.................................23葉輪基本參數(shù)的選擇............................................................................................................33.1比轉(zhuǎn)速的確定..........................................................

3、.......................................................33.2葉輪外徑D和輪轂直徑dh的確定...............................................................................33.3葉片數(shù)Z的選擇........................................................

4、.....................................................44葉片各截面的葉柵計(jì)算（流線法）....................................................................................44.1流線法設(shè)計(jì)葉片總體步驟...................................................

5、..........................................54.2分計(jì)算截面.....................................................................................................................64.3選定葉柵疏密度lt計(jì)算弦長(zhǎng)l=tlt..............................

6、............................................64.4葉片厚度y的確定..........................................................................................................74.5確定進(jìn)口軸面速度Vm1...........................................

7、.....................................................84.6確定出口圓周速度Vu2.................................................................................................94.7確定各截面葉片進(jìn)出口角1?和2?...................................

8、............................................104.8確定葉弦安放角L?，計(jì)算型線半徑R........................................................................104.9選擇翼型.........................................................................

9、..............................................114.10實(shí)例流程.....................................................................................................................125葉片各截面的葉柵計(jì)算（升力法）.............................

10、.....................................................145.1分計(jì)算截面...................................................................................................................155.2確定軸面速度Vm和葉輪環(huán)量Γ.......................

11、.........................................................155.3計(jì)算m?和此速度與圓周速度之間的夾角m?.........................................................165.4選定葉片平面重疊系數(shù)m或葉柵疏密度lt.........................................................

12、.....175.5假定?角........................................................................................................................185.6求葉柵中翼型的升力系數(shù)Cl....................................................................

13、...................185.7選擇翼型.......................................................................................................................185.8葉柵影響的修正——平板葉柵修正法及確定翼型的安放角??..............................225.9抗空化性能校

14、核...........................................................................................................245.10計(jì)算葉輪的水力效率.................................................................................................

15、256葉片的繪型..........................................................................................................................316.1繪翼型圖.................................................................................

16、......................................316.2確定葉片旋轉(zhuǎn)軸線位置...............................................................................................336.3做葉片的軸面投影圖..........................................................

17、.........................................336.4在葉片軸面投影圖上做垂直于軸線的截面...............................................................346.5做木模截線...................................................................................

18、................................346.6生成三維葉片（如圖23所示）................................................................................373（1）確定葉輪的輪轂比）確定葉輪的輪轂比；（；（2）葉片數(shù)）葉片數(shù)Z；（；（3）外徑）外徑D。hd第四、葉片的設(shè)計(jì)（流線法、升力法、……）第四、葉片的設(shè)計(jì)（流線法、升力法、

19、……）第五、葉片的繪型第五、葉片的繪型3葉輪基本參數(shù)的選擇葉輪基本參數(shù)的選擇3.1比轉(zhuǎn)速的確定比轉(zhuǎn)速的確定已知轉(zhuǎn)速n后，就可根據(jù)公式計(jì)算出比轉(zhuǎn)速來(lái)。軸流泵的比轉(zhuǎn)速ns一般為5001200，但根據(jù)需要，可以超出此范圍，有些資料介紹ns的范圍為4002000.ns==953.6448≈954343.65nQH3.2葉輪外徑葉輪外徑D和輪轂直徑和輪轂直徑dh的確定的確定葉輪直徑D和輪轂直徑dh應(yīng)根據(jù)軸面速度Vm的大小來(lái)確定。軸面速度Vm的可按

20、下面式計(jì)算：Vm=0.07==91.38625ms23nQ320.0714500.363??式中Q——設(shè)計(jì)流量n——轉(zhuǎn)速Vm——液體進(jìn)入轉(zhuǎn)輪以前的軸面速度輪轂比dhD與比轉(zhuǎn)速ns有關(guān)，其值根據(jù)表1或圖1選取:表1輪轂比輪轂比dhD與比轉(zhuǎn)速與比轉(zhuǎn)速ns的關(guān)系的關(guān)系ns50060070080090010001100dhD0.500.630.460.590.440.560.400.530.370.500.350.480.330.46圖1輪轂比