Exampl l Ajet engine working at design condition at the inlet of the nozzle p1=205×10Nm2T1=865K,Ⅵ1=288m/s,A1=0.19m3; At the outlet p,=1.143 x10N/m T2=766K, A2=0.1538m Please find the mass flux and velocity at the outlet Given R=287. 4 J/k, K gas constant Solution rm= pAv Rn AV-P,AV 45.1kg/s R71 According to the conservation of mass m=14V1=P2A12→P41 RT RT 2=565.1m/s Homework P185P3 12 P189P336Example: A jet engine working at design condition. At the inlet of the nozzle At the outlet Please find the mass flux and velocity at the outlet. Given gas constant 5 2 1 p N m =  2.05 10 / T1 =865K，V1=288 m/s，A1=0.19㎡； 5 2 2 p N m =  1.143 10 / T2 =766K，A2=0.1538㎡ R=287.4 J/kg.K。 Solution 1 1 1 1 45.1 / p AV kg s RT m AV =  = = p AV RT = 1 1 1 2 2 2 1 2 p AV p A V RT RT = According to the conservation of mass m AV A V = =   1 1 1 2 2 2  1 1 2 2 1 2 2 1 565.1 / A p T V V m s A p T  = = Homework: P185 P3.12, P189P3.36