轴流泵设计步骤

1、轴流泵设计数据 1、设计参数： 流量 Q 1000( m³/h ) 扬程 H 4.5 (m) 转速 n 1450 ( r/min ) 效率 85 汽蚀比转速C1000 2、结构形式： 采用60°出水弯管 3、 底板至叶轮中心距离：1m轴流泵水力设计一、叶轮的水力设计（一）结构参数的选择1确定轮毂比 根据轮毂比与比转速的关系表，取14001000700500d0.350.400.400.350.480.550.550.602叶轮直径D 叶轮直径一般根据轴面速度来确定，为了得到最优的影片安放角，叶轮进口前的轴面速度，采用C.C.鲁德涅夫推荐公式来确定：根据液流的连续性条件，不考

2、虑排挤，则叶轮区域内的轴面速度为 取，则根据轮毂比及给定的参数，叶轮直径即可求出。则 取 D=272mm 即 3确定叶片数Z 叶片数通常按选取50070010001400Z5645343为了更易于调节动平衡，取Z=44确定叶栅稠密度Z=4,叶轮外缘的叶栅稠密度推荐为，同时，适当减小外缘的，增加轮毂侧的，以减小内外侧翼型的长度差，均衡叶片出口的扬程。所以，轮毂和轮缘之间各截面的按直线规律变化，其值为 取，则4确定叶片翼型的厚度：通常轮毂截面的相对厚度为 （1015）%轮缘截面的厚度按工艺条件确定，通常轮缘截面的相对厚度 （25）%从轮毂到轮缘其厚度按直线规律变化。（二） 选定截面及计算1确定计算

3、截面通常选取五个彼此等距离的计算流面，由于本设计要求为为半调节式轴流料浆泵，考虑到叶片的调节，轮毂和轮缘需作成球面。 各计算流面的半径可按下式确定： 截面D取值：122，160,198,236,2722确定轴面速度和速度环量（1）确定轴面速度 取 即 （2）确定速度环量 3升力法设计计算选定截面计算表格设计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由图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 选择翼型(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计算泵的汽蚀比转速C 知道设计流量Q和轴流泵的转速n，根据GB/T 13006-91,查取临界汽蚀余量,计算泵的汽蚀比转速C：，查得符合设计要求。计算各截面翼型厚度坐标（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翼型如图： （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翼型如图：（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翼型如图：（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翼型如图：（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翼型如图：5叶轮绘型（1）画翼型展开图（2）确定叶片旋转轴线位置： 旋转轴线通常取离翼弦进口为（0.30.4）l处，而且一般和翼型最大厚度位置一致。另外，旋转

11、中心一般通过翼型的骨线，也可以偏离骨线，但是，其纵向位置应当有规律变化，以保证叶片表面的光滑。（3）作叶片轴面投影图，（4）坐平面投影图和木模截线图二、导叶的水力设计（一） 导叶结构参数的选择 1 确定导叶体的扩散角 一般导叶体的扩散角为，取。2 导叶进口边一般和叶轮出口平行，其间距为e=（0.050.1）D,即 e=13.627.2mm 取 3 叶片数一般取Z=510片，低比转速取大值，本设计为比转速的轴流清水泵，故取叶片数Z=7。4 弯管（管径为）通常是等截面的，因此，与之相联的扩散管出口直径（）也应该与弯管相同，为标准直径。 故 1 导叶的设计与计算(见下表):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） 导叶绘型 按锥面分流面，其作图方法和叶轮叶片绘型完全相同，即采用扭曲三角形法绘型。1根据计算绘制轴面投影图，在轴面投影图上作等距木模截线。

16、绘型计算表格如下：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.