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已知20800t单桨多用途远洋货轮的主要数据:船长Lpp=140m,船宽B=21.8m,吃水T=8.9m,方形系数C B =0.743,舯横剖面系数C M =0.94,主机最大持续功率等于8460hp,转速等于155r/min,相对旋转效率等于1.0,螺旋桨为MAU4叶桨, D=4.78m, P/D=0.684, A E /A 0 =0.545, η 0 =0.55, η s =0.98, Vmax=15.48kn,w=0.7Cp-0.18,t=0.5Cp-0.12。 今用缩尺比α=25的船模进行阻力试验,求:船模速度、实船和船模相应Re和Fr(ν=1.30*10 -6 m 2 /s,);计算螺旋桨进速系数、收到马力系数、推进系数、P 0.7 和桨叶伸张面积。
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