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MEL 715 : GAS DYNAMICS . P M V Subbarao Associate Professor Mechanical Engineering Department I I T Delhi. A Passion of Doing Adventures lead to a Hi-Fi Science and Technology!!!. The Shocking News. People had dreamed of flying for many years. A Shocking News ?#$?%?

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Mel 715 gas dynamics l.jpg

MEL 715 : GAS DYNAMICS

P M V Subbarao

Associate Professor

Mechanical Engineering Department

I I T Delhi

A Passion of Doing Adventures lead to a

Hi-Fi Science and Technology!!!


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The Shocking News

  • People had dreamed of flying for many years.

  • A Shocking News ?#$?%?

  • 1 million to 10 million years they might be able to make a plane that would fly ?!?!?!

  • The United States Army was trying to develop an airplane in 1903, but the plane wouldn't fly.

  • The New York Times wrote that maybe in1 million to 10 million years they might be able to make a plane that would fly.

  • Only eight days later two men were successful in flying the first manned plane.

  • They were Wilbur Wright and his younger brother, Orville.


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A Narrow Gap Between Possibility & Impossibility

  • The would-be aeronauts of the nineteenth century closely studied the flight of birds and began building flying machines patterned after avian structures.

  • Their birdlike craft failed miserably.

  • They quickly realized that in reality they knew nothing about the lift and drag forces acting on surfaces cutting through the atmosphere.

  • To fly, man first had to understand the flow of air over aircraft surfaces.

  • This meant that he had to build instrumented laboratories in which wings, fuselages, and control surfaces could be tested under controlled conditions.

  • Thus it is not surprising that the first wind tunnel was built a full 30 years before the Wrights' success at Kitty Hawk.

  • A science called Aerodynamics leading to Gas dynamics.


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Motivating Examples

  • Re-entry flows

  • Rocket Nozzle Flows

  • Jet Engine Inlets

  • Celestial Gas Flows

  • Volcanic Gas flows..







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Gas Dynamics of Re-entry

  • A range of phenomena are present in the re-entry of a vehicle into the atmosphere.

  • This is an example of an external flow.

  • Bow shock wave : Suddenly raises density, temperature and pressure of shocked air; consider normal shock in ideal air

  • ro= 1:16 kg/m3 to rs= 6:64 kg/m3(over five times as dense!!)

  • To = 300 K to Ts= 6100 K (hot as the sun's surface !!)

  • Po = 1:0 atm !to Ps= 116:5 atm (tremendous force change!!)








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Propagation of a Pulsed Protostellar Jet

Protostellar jets are unique in that they have high Mach numbers, are overdense compared to their surroundings, and they are strongly radiatively cooled.

A large number of studies have reported the dynamical evolution of such jets: cooling results in the formation of thin dense shells which are easily fragmented into clumps and "bullets".


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