AME436-S08-PS4

# AME436-S08-PS4 - AME 436 Problem Set#4 Assigned Due at...

This preview shows pages 1–2. Sign up to view the full content.

AME 436 Assigned: 3/10/08 Problem Set #4 Due: 3/24/08 at 12:00 noon in OHE 430 for on-campus students (scan and email to Dan Hong or fax to me at 213- 740-8071 if you’re off campus); DEN students submit homework through DEN For all problems, if useful, you can use the AirCycles.xls spreadsheet to guide your answers but you need to explain your results. Note: laptops or Pocket PCs running Excel spreadsheets will NOT be permitted on the exams. Problem #1 For an Otto cycle with constant-volume combustion and the following parameters: r = 9, γ = 1.3, M = 0.029 kg/mole, f = 0.062, Q R = 4.3 x 10 7 J/kg, T 2 = 300K, P 2 = 0.5 atm, P exh = 1 atm, h = 0, η comp = η exp = 0.9 (in other words, ideal except for the compression and expansion efficiency, and the throttling ), determine the following: a) Temperature (T 3 ) and pressure (P 3 ) after compression, and the compression work per kg of mixture b) Temperature (T 4 ) and pressure (P 4 ) after combustion c) Temperature (T 5 ) and pressure (P 5 ) after expansion, and the expansion work per kg of mixture d) Net work per kg of mixture (don’t forget about the throttling loss!) e) Thermal efficiency f) IMEP Note in this case that we cannot simply use P 2 r γ and T 3 = T 2 r γ -1 ; instead we have to use the definitions of compression and expansion efficiency given in lecture 6 to get the pressures and temperatures. Problem #2

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 4

AME436-S08-PS4 - AME 436 Problem Set#4 Assigned Due at...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online