问答题X 纠错
傅如德换算关系:Rts=Rfs+(Rtm-Rfm)α3
Vs=α0.5,Vm=5*1.8=9m/s
Ss=Sm*α2=4.6*25*25=2875
R.e=VL/v
Res=VsLs/v=9*100*10-6/1.3064=6.889*108
Rem=VmLm/v=1.8*4*10-6/1.3064=5.511*106
Cfs=0.075/(lgRe-2)2=0.001604
Cfm=0.075/(lgRe-2)2=0.003336
Rfs=Cfs0.5ρSsVs2=0.0016*0.5*2875*999.63*81=186558.8N
Rfm=Cfm0.5ρSmVm2=0.003336*0.5*4.6*999.63*3.24=24.85N
Rts=Rfs+(Rtm-Rfm)α3=186558.8+(3.6*9.8-24.85)α3=186558.8+162968.8=349527.6N=35666kg
Pe=V*T/75=9*35666/75=4280hp。
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