螺旋桨设计计算说明书

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1、某沿海单桨散货船螺旋桨设计计算说明书1.已知船体的主要参数船长L=118.00米型宽B=9.70米设计吃水T=7.20米排水量△=5558.2吨方型系数CB=0.658桨轴中心距基线高度Zp=3.00米由模型试验提供的船体有效马力曲线数据如下：航速V（节）13141516有效马力PE（马力）21602420300540452.主机参数型号6ESDZ58/100柴油机额定功率Ps=5400hp额定转速N=165rpm转向右旋传递效率ηs=0.983.相关推进因子伴流分数w=0.279推力减额分数t=0.223相对旋转效率ηR=1.0船身效率4.可以达到最大航速的计算采用

2、MAU四叶桨图谱进行计算。取功率储备10%，轴系效率ηs=0.98螺旋桨敞水收到马力：PD=4762.8根据MAU4-40、MAU4-55、MAU4-70的--δ图谱列表计算：项目单位数值假定航速Vkn13141516VA=(1-w)Vkn9.37310.09410.81511.536Bp=NPD0.5/VA2.5　42.3368531435.1768434329.6038917325.19283245　Bp　6.506677585.9310069495.4409458495.019246203MAU4-40　δ　75.7911097970.1201103464.99

3、87634160.73945786P/D　0.64020480.6673559850.6942908350.720575125ηO　0.5577095480.5827961810.6054554380.626009401PTE=PDηH*η0hp2862.5704162991.3332343107.6369953213.134863MAU4-55　δ　74.6166161168.5922432963.5842978159.32457302P/D　0.6860848310.7127911470.7408684540.769990337ηO　0.5415244970.56

4、71485090.5908757070.611197774PTE=PDηH*η0　hp2779.4969822911.0180183032.8032333137.110838MAU4-70　δ　73.7698546667.8016517563.0802816458.68822806P/D　0.6926187510.7230072940.754028820.785953745ηO　0.5211198050.5455488290.5656107850.582834957PTE=PDηH*η0　hp2674.7652862800.1527742903.1253032991.

5、532264据上表的计算结果可绘制PTE、δ、P/D及ηO对V的曲线，如下图所示。从PTE—f(V)曲线与船体满载有效马力曲线之交点，可获得不同盘面比所对应的设计航速及螺旋桨最佳要素P/D、D及ηO如下表所列。MAUVmaxP/DδDηO4-4015.138010.6979564.36934.2579336980.6083805334-5515.038720.7419863.409633334.1669418110.5917193334-7014.853019330.7494163.730873334.1363372080.5629094675.空泡校核按柏利尔空泡限

6、界线中商船上限线，计算不发生空泡之最小展开面积比。桨轴沉深hf=T－Zp=7.2－3.00=4.2mp0－pv=pa+γhs－pv=10300+1025×4.2-174=14461kgf/m2计算温度t=15°C,Pv=174kgf/m2,PD=4762.8hp,ρ=104.63kgfs2/m4序号项目单位数值MAU4-40MAU4-55MAU4-701VmaxKn15.1380115.0387214.853019332VA=0.5144Vmax(1-w)m/s5.614421485.577596575.508723463(0.7πND/60)2(m/s)2663.0

7、69425635.032694625.7388024V20.7R=V2A+32(m/s)2694.591153666.142277656.0848365σ=(p0-pv)/0.5ρV0.7R20.397963140.414958910.421320026τc　0.163750.16750.169757T=PD·ηO·75/VAkgf38707.391537895.903836501.54028AP=T/0.5ρV0.7R2·τcm26.505147066.492085516.264914919AE=AP/(1.067-0.229P/D)m27.170