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Diesel Cycle and the Brayton Cycle

Diesel Cycle and the Brayton Cycle. Chapter 9b. Rudolph Diesel. German inventor who is famous for the development of the diesel engine The diesel engine is based on a compression ignition system. http://www.autonews.com/files/euroauto/inductees/diesel.htm. Diesel Engines. No spark plug

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Diesel Cycle and the Brayton Cycle

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  1. Diesel Cycle and the Brayton Cycle Chapter 9b

  2. Rudolph Diesel • German inventor who is famous for the development of the diesel engine • The diesel engine is based on a compression ignition system http://www.autonews.com/files/euroauto/inductees/diesel.htm

  3. Diesel Engines • No spark plug • Fuel is sprayed into hot compressed air

  4. State Diagrams for the Diesel Cycle

  5. Diesel Cycle Otto Cycle The only difference is in process 2-3

  6. Consider Process 2-3 • This is the step where heat is transferred into the system • We model it as constant pressure instead of constant volume

  7. Consider Process 4-1 • This is where heat is rejected • We model this as a constant v process • That means there is no boundary work

  8. As for any heat engine… substitute

  9. Rearrange rc is called the cutoff ratio – it’s the ratio of the cylinder volume before and after the combustion process

  10. rc This doesn’t do us much good

  11. rc Since Process 1-2 and Process 3-4 are both isentropic 1 1

  12. Finally, Since process 1-2 is isentropic The volume ratio from 1 to 2 is the compression ratio, r

  13. Which finally gives…

  14. k=1.4

  15. The efficiency of the Otto cycle is always higher than the Diesel cycle • Why use the Diesel cycle? • Because you can use higher compression ratios

  16. Typical range for gasoline engines

  17. P-v Diagram for an ideal dual cycle

  18. Brayton Cycle • Ideal Cycle for Gas Turbine Engines • Usually operate on an open cycle

  19. Closed cycle model for a gas turbine engine 1-2 Isentropic Compression 2-3 Constant Pressure heat addition 3-4 Isentropic Expansion 4-1 Constant Pressure heat rejection

  20. Closed cycle model for a gas turbine engine 4-1 Constant Pressure heat rejection 2-3 Constant Pressure heat addition 3-4 Isentropic Expansion 1-2 Isentropic Compression

  21. Remainder of the Chapter • I’m not skipping the other sections in this chapter because they are unimportant, or uninteresting • We just don’t have time!!

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