軸流泵設(shè)計(jì)步驟

1、軸流泵設(shè)計(jì)數(shù)據(jù) 1、設(shè)計(jì)參數(shù)： 流量 Q 1000( m³/h ) 揚(yáng)程 H 4.5 (m) 轉(zhuǎn)速 n 1450 ( r/min ) 效率 85 汽蝕比轉(zhuǎn)速C1000 2、結(jié)構(gòu)形式： 采用60°出水彎管 3、 底板至葉輪中心距離：1m軸流泵水力設(shè)計(jì)一、葉輪的水力設(shè)計(jì)（一）結(jié)構(gòu)參數(shù)的選擇1確定輪轂比 根據(jù)輪轂比與比轉(zhuǎn)速的關(guān)系表，取14001000700500d0.350.400.400.350.480.550.550.602葉輪直徑D 葉輪直徑一般根據(jù)軸面速度來(lái)確定，為了得到最優(yōu)的影片安放角，葉輪進(jìn)口前的軸面速度，采用C.C.魯?shù)履蛲扑]公式來(lái)確定：根據(jù)液流的連續(xù)性條件，不考

2、慮排擠，則葉輪區(qū)域內(nèi)的軸面速度為 取，則根據(jù)輪轂比及給定的參數(shù)，葉輪直徑即可求出。則 取 D=272mm 即 3確定葉片數(shù)Z 葉片數(shù)通常按選取50070010001400Z5645343為了更易于調(diào)節(jié)動(dòng)平衡，取Z=44確定葉柵稠密度Z=4,葉輪外緣的葉柵稠密度推薦為，同時(shí)，適當(dāng)減小外緣的，增加輪轂側(cè)的，以減小內(nèi)外側(cè)翼型的長(zhǎng)度差，均衡葉片出口的揚(yáng)程。所以，輪轂和輪緣之間各截面的按直線規(guī)律變化，其值為 取，則4確定葉片翼型的厚度：通常輪轂截面的相對(duì)厚度為 （1015）%輪緣截面的厚度按工藝條件確定，通常輪緣截面的相對(duì)厚度 （25）%從輪轂到輪緣其厚度按直線規(guī)律變化。（二） 選定截面及計(jì)算1確定計(jì)算

3、截面通常選取五個(gè)彼此等距離的計(jì)算流面，由于本設(shè)計(jì)要求為為半調(diào)節(jié)式軸流料漿泵，考慮到葉片的調(diào)節(jié)，輪轂和輪緣需作成球面。 各計(jì)算流面的半徑可按下式確定： 截面D取值：122，160,198,236,2722確定軸面速度和速度環(huán)量（1）確定軸面速度 取 即 （2）確定速度環(huán)量 3升力法設(shè)計(jì)計(jì)算選定截面計(jì)算表格設(shè)計(jì)公式截面截面截面截面截面112216029823627229.262512.147515.032517.917620.650736.0286.0286.0286.0286.02845.31084.04953.27232.74542.381250.91240.59550.45000.36430

4、.3098642.377330.773824.227720.016717.213071111180.99980.99980.99980.99980.999890.68680.52660.42620.35860.31261095.8186125.6637155.5088185.3540213.628311由圖10100.960.910.850.790.7312 l91.9859114.3540132.1825146.4297155.948713 l取整921141321461561479.9906138.8069215.7990310.0705415.0148151.16520.66780.42

5、890.29760.2213161.21380.73380.50460.37670.3032170.91.121.371.51.55181.348670.655180.368320.251130.195611911.9611.410.5610.229.3620 選擇翼型(NACA)441344104408440744062116°4°-1°-2°-3°2258.38°34.77°23.23°18.02°14.21°231.1°1.1°0.9°-1.2°0.

6、94計(jì)算泵的汽蝕比轉(zhuǎn)速C 知道設(shè)計(jì)流量Q和軸流泵的轉(zhuǎn)速n，根據(jù)GB/T 13006-91,查取臨界汽蝕余量,計(jì)算泵的汽蝕比轉(zhuǎn)速C：，查得符合設(shè)計(jì)要求。計(jì)算各截面翼型厚度坐標(biāo)（1）截面：NACA4413l=9211.96比例0.919x01.152.304.596.899.1913.7818.3722.96h02.433.354.665.646.447.678.529.10b0-1.42-1.96-2.53-2.81-2.97-3.04-2.95-2.67x27.5636.7445.9355.1264.3073.4982.6787.2792h9.429.448.887.846.434.692.6

7、01.410b-2.54-2.09-1.69-1.27-0.87-0.55-0.31-0.210翼型如圖： （2）截面：NACA4410l=11411.4比例1.138x01.422.845.698.5311.3817.0722.7528.44h02.303.274.635.716.567.938.909.57b0-1.44-1.79-2.20-2.37-2.39-2.28-2.03-1.73x34.1345.5156.8968.2679.6491.02102.40108.08114h9.9710.029.458.406.915.042.791.510b-1.43-0.96-0.59-0.27

8、-0.060.060.020.050翼型如圖：（3）截面：NACA4408l=13210.56比例1.318x01.653.36.599.8913.1819.7826.3732.96h02.153.114.525.636.548.009.049.76b0-1.21-1.54-1.82-1.85-1.79-1.46-1.08-0.69x39.5552.7365.9279.1092.28105.47118.65125.24132h10.229.709.808.717.195.272.901.570b-0.340.180.500.700.740.620.360.130翼型如圖：（4）截面：NACA4

9、407l=14610.22比例1.458x01.823.647.2910.9314.5821.8729.1636.45h02.13.094.535.696.638.189.3010.07b0-1.14-1.43-1.60-1.55-1.36-0.99-0.51-0.04x43.7458.3272.9087.48102.05116.63131.21138.50146h10.5710.7610.199.087.515.513.031.630b0.350.901.181.311.251.010.550.250翼型如圖：（5）截面：NACA4406l=1569.36比例1.555x01.943.897

10、.7711.6615.5523.3231.0938.87h01.942.924.345.496.458.019.179.98b0-1.00-1.23-1.27-1.14-0.93-0.390.190.72x46.6462.1977.7493.29108.84124.39139.93147.71156h10.5110.7310.189.107.545.543.051.630b1.151.711.931.971.801.410.760.370翼型如圖：5葉輪繪型（1）畫(huà)翼型展開(kāi)圖（2）確定葉片旋轉(zhuǎn)軸線位置： 旋轉(zhuǎn)軸線通常取離翼弦進(jìn)口為（0.30.4）l處，而且一般和翼型最大厚度位置一致。另外，旋轉(zhuǎn)

11、中心一般通過(guò)翼型的骨線，也可以偏離骨線，但是，其縱向位置應(yīng)當(dāng)有規(guī)律變化，以保證葉片表面的光滑。（3）作葉片軸面投影圖，（4）坐平面投影圖和木模截線圖二、導(dǎo)葉的水力設(shè)計(jì)（一） 導(dǎo)葉結(jié)構(gòu)參數(shù)的選擇 1 確定導(dǎo)葉體的擴(kuò)散角 一般導(dǎo)葉體的擴(kuò)散角為，取。2 導(dǎo)葉進(jìn)口邊一般和葉輪出口平行，其間距為e=（0.050.1）D,即 e=13.627.2mm 取 3 葉片數(shù)一般取Z=510片，低比轉(zhuǎn)速取大值，本設(shè)計(jì)為比轉(zhuǎn)速的軸流清水泵，故取葉片數(shù)Z=7。4 彎管（管徑為）通常是等截面的，因此，與之相聯(lián)的擴(kuò)散管出口直徑（）也應(yīng)該與彎管相同，為標(biāo)準(zhǔn)直徑。 故 1 導(dǎo)葉的設(shè)計(jì)與計(jì)算(見(jiàn)下表):r0.0610.080.0

12、990.1180.136D122160198236272Vm6.0286.0286.0286.0286.028Vu5.31084.04953.27232.74542.38210.88420.91820.93690.94860.95621.2836977691.6211923731.9661963812.3146455432.6464550090.9089923431.0180936921.1002954331.1629849651.20951714552.08 58.33 63.04 66.63 69.30 s55555su36.3380602665.8746897355.6095233555

13、.4466762735.345047196zd77777t354.7518571471.8057142988.85957143105.9134286122.06971430.8842402690.918186320.9368720410.9485742620.956213159e120122.5125127.51304909090909071.0407124374.1662358676.5211422878.3170650579.650113821.2398577671.2944068331.3355064911.3668503331.390115736l126.8850636127.3326

14、621128.5417343130.1983608132.151207718.9592875715.8337641413.4788577211.6829349510.349886180.3308922330.2763431670.2352435090.2038996670.180634264R195.28 233.35 275.75 321.49 367.79 l(翼型安放角)71.04 74.17 76.52 78.32 79.65 1.24 1.29 1.34 1.37 1.39 tan(/2 )0.0455488760.0419815320.0375573080.033356220.02

15、98149270.0455174150.0419568950.0375396640.0333438580.0298060970.0910348310.083913790.0750793280.0666877150.0596121952.6080327142.4040239072.1509277441.9105186571.7078139575.2160654294.8080478144.3018554883.8210373143.415627915（二） 導(dǎo)葉繪型 按錐面分流面，其作圖方法和葉輪葉片繪型完全相同，即采用扭曲三角形法繪型。1根據(jù)計(jì)算繪制軸面投影圖，在軸面投影圖上作等距木模截線。

16、繪型計(jì)算表格如下：791翼型截面截面截面截面截面max8.99 8.48 8.18 8.00 7.89 x/l00.050.0750.10.20.30.40.50.60.70.80.90.951截面06.3442531789.51637976712.6885063625.3770127138.0655190750.7540254263.4425376.1310381388.81954449101.5080508114.1965572120.5408104126.8850636截面06.3666331079.54994966112.7332662125.4665324338.1997986450

17、.9330648663.6663376.3995972889.1328635101.8661297114.5993959120.966029127.3326621截面06.4270867139.6406300712.8541734325.7083468538.5625202851.4166937164.2708777.1250405689.97921399102.8333874115.6875608122.1146476128.5417343截面06.5099180419.76487706113.0198360826.0396721639.0595082552.0793443365.09918

18、78.11901649911586887117.1785247123.6884428130.1983608截面06.6075603849.91134057713.2151207726.4302415439.6453623152.8604830866.075679.2907246192.50584538105.7209662118.9360869125.5436473132.1512077/max00.2960.4050.4890.7780.920.97810.8830.7560.5440.3560.20截面02.661043.640954.396116.994228.27088.792228.997.938176.796444.890563.200441.7980截面02.510083.43444.146726.597447.80168.