homework1

# homework1 - MAE 113 Fundamentals of Propulsion Winter 2011...

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MAE 113 Fundamentals of Propulsion Homework Assignment 1 Winter, 2011 Due: Thursday, January 13 th in Class Page 1 of 2 Problem 1 Water flows through a horizontal ( x , y plane), 180° pipe bend as illustrated in figure 1. The flow cross-sectional area is constant at a value of 0.2 ft 2 everywhere along the pipe. The magnitude of the flow velocity everywhere in the bend is 80 ft/s and axial. The absolute (stagnation) pressures at the entrance and exit of the bend are 40 psia and 30 psia, respectively. Write the momentum equation to an appropriate control volume and calculate the horizontal ( x and y ) components of the anchoring force required to hold the bend in place. Problem 2 The rocket shown in figure 2 is held stationary by the horizontal force, F x , and the vertical force, F z. . The velocity and pressure of the exhaust gas are 5000 ft/s and 20 psia at the nozzle exit, which has a cross section area of 60 in 2 . The exhaust mass flow rate is constant at 21 lbm/s.

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