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Meen 344- HW 12

# Meen 344- HW 12 - is 0.15 The nozzle discharges to the...

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MEEN 344: Section 502 HW Problem Set #12 1. Air flows steadily and isentropically through a passage. At section I , where the cross- sectional area is 0.02 m 2 , the air is at 40.0 kPa(abs), 60 o C, and M =2.5. At section II downstream, the speed is 519 m/s. Calculate the Mach number at section II . Sketch the shape of the passage between sections I and II . 2. Air flowing isentropically through a converging nozzle discharges to the atmosphere. At a section the area is A = 0.05 m 2 , T = 3.3 o C, and V = 210 m/s. If the flow is just choked, find the pressure and the Mach number at this location. What is the throat area? What is the mass flow rate? 3. Air flowing isentropically through a converging nozzle attached to a large tank, where the absolute pressure is 171 kPa and the temperature is 27 o C. At the inlet section the Mach number
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Unformatted text preview: is 0.15. The nozzle discharges to the atmosphere; the discharge area is 0.015 m 2 . Determine the magnitude and direction of the force that must be applied to hold the nozzle in place. 4. A small rocket motor, fueled with hydrogen and oxygen, is tested on a thrust stand at a simulated altitude of 10 km. The motor is operated at chamber stagnation conditions of 1500 K and 8.5 MPa (gage). The combustion product is water vapor, which may be treated as an ideal gas. Expansion occurs through a converging-diverging nozzle with design Mach number of 3.5 and exit area of 700 mm 2 . Evaluate the pressure at the nozzle exit plane. Calculate the mass flow rate of exhaust gas. Determine the force exerted by the rocket motor on the thrust stand....
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