mel 715 : gas dynamics p m v subbarao associate professor mechanical engineering department i i t...
TRANSCRIPT
![Page 1: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/1.jpg)
MEL 715 : GAS DYNAMICS
P M V SubbaraoAssociate Professor
Mechanical Engineering DepartmentI I T Delhi
A Passion of Doing Adventures lead to a Hi-Fi Science and Technology!!!
![Page 2: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/2.jpg)
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 in
1 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.
![Page 3: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/3.jpg)
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.
![Page 4: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/4.jpg)
Motivating Examples
• Re-entry flows • Rocket Nozzle Flows • Jet Engine Inlets• Celestial Gas Flows• Volcanic Gas flows..
![Page 7: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/7.jpg)
Applicability of Continuum Theory
![Page 8: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/8.jpg)
Entry Interface Gas Dynamics
![Page 9: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/9.jpg)
Re-Entry
![Page 10: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/10.jpg)
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
o = 1:16 kg/m3 to s = 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!!)
![Page 11: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/11.jpg)
Rockets : An Example of Internal Flow
![Page 12: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/12.jpg)
Rocket Nozzle Flows
![Page 13: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/13.jpg)
Jet Engines
![Page 14: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/14.jpg)
Supersonic Jet Engines
![Page 15: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/15.jpg)
Supersonic Jet Engine Inlets
![Page 16: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/16.jpg)
Volcanic Gas Dynamics
![Page 17: 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](https://reader036.vdocuments.us/reader036/viewer/2022062516/56649e3a5503460f94b2c0e0/html5/thumbnails/17.jpg)
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".