D=0,025 m Po=2.7 MPa To=460k ·0.6m f=0.005 (Areage Fanning friction factor) F ( recall f= repvz Air at stagnation temper

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D 0 025 M Po 2 7 Mpa To 460k 0 6m F 0 005 Areage Fanning Friction Factor F Recall F Repvz Air At Stagnation Temper 1 (219.67 KiB) Viewed 34 times

D=0,025 m Po=2.7 MPa To=460k ·0.6m f=0.005 (Areage Fanning friction factor) F ( recall f= repvz Air at stagnation temperature 460 K and stagnation pressure 2.70 MPa flows isentropically through a converging nozzle, as shown in the figure. The nozzle feeds an adiabatic, constant- area duct with friction having diameter D=0.025 meters, and its length is 1L2 = 0.60 meters. The average Fanning friction factor is f = 0.005, (Recall that the Darcy or Moody friction factor is four times the Fanning friction factor.) Determine the maximum mass-flow-rate through the system, and the range of back-pressures which will allow this maximum mass-flow-rate. Determine the stagnation temperature and stagnation pressure at the exit of the duct (for maximum mass-flow-rate). Compare the preceding results with the same results which are obtained for flow through the isentropic nozzle in the absence of the constant-area duct.