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 Mechanical Engineering  |  Question 38 of 139    Print  
Explain in detail about pneumatic engine.

  
Total Answers and Comments: 1 Last Update: November 03, 2007     Asked by: prakashtce2 
  
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 Best Rated Answer
Submitted by: robinsingh
 
in CI engines...the kinetic energy which is lost during braking is partially recovered by a simple change in the cylinder design.....an additional valve called charging valve which leads to a separate air chamber ....now wen the vehicle needs a stop,...the braking is not applied wen the vehicle is in top speed say abt 130 kmph....the vehicle is switched for pneumatic operation wen the following happens......the fuel supply is cut off and the charging valve is opened......the incoming air gets compressed by the reciprocating piston and gets into the chamber at high pressure......the engine acts as an air compressor.....now air gets compressed till the KE is high enough....and this process leads to slowing of the vehicle speed ....brakes are applied judiciously by the driver.......the compressed air can be used for quick acceleration of the vehicle ....or anything which can be made use of .......the efficiency is proved to increase by a satisfactory amount

Above answer was rated as good by the following members:
machogamer
November 03, 2007 10:01:20   #1  
robinsingh        

RE: Explain in detail about pneumatic engine.
in CI engines...the kinetic energy which is lost during braking is partially recovered by a simple change in the cylinder design.....an additional valve called charging valve which leads to a separate air chamber ....now wen the vehicle needs a stop ...the braking is not applied wen the vehicle is in top speed say abt 130 kmph....the vehicle is switched for pneumatic operation wen the following happens......the fuel supply is cut off and the charging valve is opened......the incoming air gets compressed by the reciprocating piston and gets into the chamber at high pressure......the engine acts as an air compressor.....now air gets compressed till the KE is high enough....and this process leads to slowing of the vehicle speed ....brakes are applied judiciously by the driver.......the compressed air can be used for quick acceleration of the vehicle ....or anything which can be made use of .......the efficiency is proved to increase by a satisfactory amount
 
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