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Meen 344- HW 12 Soln

Meen 344- HW 12 Soln - I Problem 1 r" ‘...

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H5; 4- ?‘X‘ anti “1.“, 1.4:; 5 “an wmma (rm Q $39.13 ‘5 m amine-Lani. dxzfi'mc M SKCDW m Problem 2 (In Excel) Air flowing isentropically through a converging nozzle discharges to the atmosphere. At a section the area is A = 0.05 n12, T = 13°C, and V = 210 1111's. lfthe flow isjust choked, find the pressure and the Mach number at this location. What is the throat area? What is the mass flow rate? Given: Data on converging nozzle; isentropic flow Find: Pressure and Mach number; throat area; mass flow rate Solution The given or available data is: R = 286.9 J/kgK k = 1.4 A1 = 0.05 m2 T1 — 276.3 K V] — 210 mfs p mm = 101 kPa Equations and Computations: From T1 and Eq. 11.1? t" = kRT (11.1?) c] = 333 mfs Then M1: 0.631 To find the pressure, we first need the stagnation pressure. 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