University Questions gas dynamics and jet propulsion

ANNA UNIVERSITY-CHENNAI

REGULATION 2013

DEPARTMENT OF MECHANICAL ENGINEERING

ME6604-GAS DYNAMICS AND JET PROPULSION

Unit V- Space propulsion

Part A (2 Marks)

1. Differentiate jet propulsion and Rocket propulsion.

2. What is mono propellant

3. What is bi propellant

4. Classify the rocket engines based on source of energy employed

5. What is specific impulse of a rocket?

6. Define thrust

7. What is IWR?

8. What is thrust coefficient?

9. Define propulsion efficiency

10. What is weight flow coefficient?

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Part-B (16 Marks)

1.A rocket engine has the following data. Combustion chamber pressure is 38 bar, combustion chamber temperature is 3500 K, oxidizer flow rate is 41.67 Kg/s, mixture ratio is 5, and the properties of exhaust gases are Cp/Cv = 1.3 and R = 0.287 kJ/KgK. The expansion takes place to the ambient pressure of 0.0582 bar. Calculate the nozzle throat area, thrust, thrust coefficient, exit velocity of the exhaust and maximum possible exhaust velocity.

(AU: May 2012)

2.Explain briefly about the propellant feed system of a liquid propellant rocket engine with suitable schematic sketches. (AU: May 2012)

3.A rocket has the following data: propellant flow rate = 5 Kg/s, Nozzle exit diameter = 10 cm, Nozzle exit pressure = 1.02 bar, Ambient pressure = 1.013 bar, Thrust chamber pressure = 20 bar, Thrust = 7 KN. Determine the effective jet velocity, actual jet velocity, specific impulse and the specific propellant consumption. Recalculate the values of thrust and specific impulse for an altitude where the ambient pressure is 10 m bar.

(AU: May 2012, Dec 2009)

4.Explain with a neat sketch the working of a gas pressure feed system used in liquid propellant rocket engines (AU: May 2011)

5.Describe the important properties of liquid and solid propellants desired for rocket propulsion. (AU: May 2011, May 2010, May 2008)

6.Explain the working of a turbo-pump feed system used in a liquid propellant rocket

(AU: May 2010, Dec 2007)

7.Deduce expressions for propulsion efficiency specific impulse and overall efficiency of a rocket engine. (AU: Dec 2009)

8.Explain the principle of operation of liquid propellant and solid propellant engines with neat sketch. (AU: May 2009)

9.List down the advantages of liquid propellant rockets. 
(AU: May 2009)

10.The effective jet velocity from a rocket is 2700 m/s. The forwared flight velocity is 1350 m/s and the propellant consumption is 78.6 kg/s. Calculate: thrust, Thrust power and propulsion efficiency.

(AU: Dec 2008)

11.Derive the thrust equation for rocket engines. (AU: Dec 2008)

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Unit 1 Question bank-Click the link
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Unit 2 Question bank-Click the link
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Unit 3 Question bank-Click the link
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Unit 4 Question bank-Click the link
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Unit 5 Question bank-Click the link
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