1、3Bp = NPD0.5/VA2.5 66.16953.23043.57736.2074Bp0.58.1347.2966.6016.0175MAU4-4091.883.576.870.86P/D0.5880.6120.6360.663700.4960.5270.5530.5808THP=PDHOrHpMAU4-5590.382.375.369.3100.630.6550.6820.7100.4820.5080.5370.564MAU4-708981.2 74.668.40.6340.6580.6880.718150.4670.4940.5170.54316根据MAU4-40,MAU4-55,M
2、AU4-70的Bp-图谱列下表计算。据表中的计算结果可绘制THP-Vs曲线,如下图1所示。从THP-Vs曲线EHP曲线交点处可获得: MAU4-40 Vs=11.08KnMAU4-55 Vs=10.95KnMAU4-70 Vs=10.82Kn图16. 初步确定桨的要素MAU设计航速Vs(kn)D(m)4-4010.790.681.520.5554-5510.680.69176.41.550.5384-7010.540.69576.21.600.510以上数据均由上图1查得。7. 拖力计算拖网航速Vs=4Kn计算项目直径D(m)VA=0.5145Vs (1)(m/s)1.65Q=DHP*75*6
3、0/2N846假定转速N1300340360J=60VA / N1 D0.2170.1920.1810.220.1940.1830.2240.1980.187K Q =3600Q/N1 2 D50.0390.0310.0280.0420.0330.0290.0470.037J(查图谱)0.1960.201K Q0.035K T0.2480.2520.254N=60VA /JD335337T拖=(Q/D)(K T / K Q)(kgf)4182406037488.空泡校核根据瓦根宁根限界限线计算桨轴沉深 h s =T M Z P=2.4m计算温度20C,则Pv=238kgf/m2取水温20度,P
4、a-大气压为:10330Kgf/mP0-Pv= P aP v+hs=12552kgf/m2 MAU4-40MAU4-70 VsVA = 0.5145 ( 1)Vsm/s1.66(0.7ND/60)2(m/s)2348343325V0.7R2 = VA2 + (3)350.8345.8327.8 = (PoPv) / 0.5V0.7R20.6840.6940.732c ( 查瓦根宁根界限线 )0.2340.2450.255T =(Q/D)(K T / K Q)kgf41834061A p= T /(c 0.5V0.7R2)m20.970.920.86AE = A p/ (1.067-0.22P/
5、D)1.0541.0090.944AE/AD = AE /D2 /40.5810.5710.5579. 确定螺旋桨的要素据上表计算结果作下图2所示,可求得不发生空泡的最小盘面比以及所对应的最佳螺旋桨要素。由图可得:AE / A0 =0.56; Vs =10.95Kn ; P / D =0.69 ; D =1.56m ;0 =0.53N=336r/min,有效拖力Te=T(1-t)=4060*(1-0.173)=3357.62kgf图210. 强度校核根据2001年钢制海船入籍建造规范校核t0.25R及t0.6R应不小于按下式计算之值: Y=1.36A1Ne/(ZbN) x=A2GAdN2D3/
6、(1010Zb)计算功率: Ne=PsS=6000.97=582 HPD=1.56 m Ad=AE/AO=0.56 P/D=0.69 =10o G=7.6 g/cm3 N=336 r/minb0.66R=0.226DAe/Ao/0.1Z=0.479b0.25R=0.722b0.66R=0.346 b0.6R=0.9911b0.66R=0.478项 目0.25R0.6R舷长 b0.3460.478k1634207k2250151k31410635k434A1=D/P(k1-k2D/P0.7R)+k3D/P0.7R-k42490.2886.5Y=A1Ne/ZbN3107.3800.7k58223k
7、6k74165k8380330A2=D/P(k5+k6)+k7+k81419.81193.4材料系数K(锰铁黄铜)x=A2GAdN2D3/(1010Zb)0.1660.102t=Y/(k-x)0.561.035.0AU标准桨厚度t60.536.17校核结果不满足要求满足要求实取桨叶厚度613511.确定设计的螺旋桨各切面厚度实际桨叶厚度按t1.0R=0.003D=5.0 mm 与t0.25R=61.2 mm连成直线决定:图三。从图中可得出各切面最大厚度为:t0.2R=64mm t0.3R=57mm t0.4R=49mm t0.5R=42mmt0.6R=35mm t0.7R=27mm t0.8R
8、=21mm t0.9R=14mm图312.螺距修正由于实际桨叶厚度小于标准厚度,故需因厚度差异进行螺距修正。设计桨 (t/b)0.7R=0.027/0.9964b0.66R =0.055标准桨 (t/b)0.7R=0.0171D/(0.99640.31075D)=0.055231- s=Va/Np=(1-w)*V*30.866/Np=0.8089(t/b)0.7R=(t/b)0.7R设-(t/b)0.7R标*0.55/0.544*0.75=0.000556(t/b)t= -2(P/D)0*(1-S) *(t/b)0.7R=-2*0.67*0.8089*0.000556=-0.000603修正后
9、的螺距比为:P/D=(P/D)0+(t/b)t=0.6913.重量及惯性距计算 采用船舶及海洋工程设计研究院公式: 桨叶重:Gbl = 0.169Zbmax (0.5t0.2+t0.6) (1d/D) D =0.169841040.64(0.50.064+0.035)(1-0.18) 1.56 =325.8kgf 桨毂重:Gn = (0.880.6d0 / d) LKd 2 =(0.880.60.14/0.27) 0.3750.27 2 = 130.8kgf螺旋桨重量:G = Gbl+ Gn = 325.8+130.8=456.6kgf 螺旋桨的惯性矩:Imp = 0.0948Zbmax (0
10、.5t0.2+t0.6) D3 =0.09480.64(0.50.064+0.035) 1.563 =519.14kgfcms2 14. 螺旋桨计算总结螺旋桨直径 D=1.56 m 螺距比 P/D=0.89 叶数 Z=4 型式 MAU型盘面比 AE/Ao=0.56纵倾角 =10o螺旋桨效率 0=0.53设计航速 Vs=10.95kn毂径比 db/D=0.18旋向 右旋 材料 锰铁黄铜15. 螺旋桨型值表螺旋桨桨叶轮廓尺寸表:r/R0.20.30.40.50.60.70.80.90.951.0从母线到叶片随边的距离14016819421824025726324321186从母线到叶片导边的距离2
11、2325620412769叶片宽度334391437474497500467370280叶片厚度645749422721从导边至最厚点的距离107126154173201212181141MAU型螺旋桨切面尺寸表:叶宽b334 最大厚度t64 X0 7 13 20 33 50 67 Yo22 38 42 49 55 59 Yu16 12 10 6 3 2 0.3 391 0.391 57 8 23 39 78 29 34 43 48 52 14 11 9 1 437 17 26 44 66 87 30 46 5 474 042 019 72 96 15 025 28 32 36 4 497 3
12、5 54 81 109 500 25 63 94 127 0.800 467 27 40 99 132 18 0.900 370 85 113 0.950 280 65 续表:064 100 107 134 167 201 234 267 301 318 58 41 117 125 156 195 273 312 51 371 390 56 131 140 175 219 262 306 350 394 416 45 31 144 154 192 239 286 333 380 427 450 19 163 174 212 260 307 355 402 498 189 236 324 368 412 457 478 00 199 242 279 317 354 392 429 448 170 181 203 231 259 314 342 356 80 177 197 218 238 269
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