Air flows through a constant area cylindrical combustion cha

Air flows through a constant area cylindrical combustion chamber of diameter 0.3m and length 3 m. Stations 1 and 2 are the inlet and outlet respectively. The inlet stagnation temperature is 1000 K and the inlet stagnation pressure is 1.5 MPa. a) If the skin friction coefficient is Cf = 0.0040 (uniform) and no combustion takes place, what will the inlet Mach number be if it is subsonic and the exit Mach number is unity? What are the values of static and stagnation pressures at the exit?

Solution

Compare the two designs descirbed in table below when each is transmitting 1200lb.in of torque at its output shaft, which rotates at 20rpm. Compute the forces on the worm gear, the efficieny and the input power required