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A four – cylinder, 2.5 liter, SI automobile engine operates at WOT on a four- stroke air – standard Otto cycle at 3000rpm. The engine has a compression ratio of 8.6:1, a mechanical efficiency of 86%, and a stroke – to – bore ratio S/B = 1.025. Fuel is isooctane with AF = 15, a heating value of 44,300 kJ/kg, and combustion efficiency  At the start of the compression stroke, conditions in the cylinder combustion chamber are 100kPa and 600C. It can be assumed that there is a 4% exhaust residual left over from previous cycle. Find: Heat added during one cycle; Maximum temperature and pressure; Work produced in isentropic power stroke;

A four – cylinder, 2.5 liter, SI automobile engine operates at WOT on a four- stroke air – standard Otto cycle at 3000rpm. The engine has a compression ratio of 8.6:1, a mechanical efficiency of 86%, and a stroke – to – bore ratio S/B = 1.025. Fuel is isooctane with AF = 15, a heating value of 44,300 kJ/kg, and combustion efficiency  At the start of the compression stroke, conditions in the cylinder combustion chamber are 100kPa and 600C. It can be assumed that there is a 4% exhaust residual left over from previous cycle. Find: Heat added during one cycle; Maximum temperature and pressure; Work produced in isentropic power stroke;

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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A four – cylinder, 2.5 liter, SI automobile engine operates at WOT on a four- stroke air – standard Otto cycle at 3000rpm. The engine has a compression ratio of 8.6:1, a mechanical efficiency of 86%, and a stroke – to – bore ratio S/B = 1.025. Fuel is isooctane with AF = 15, a heating value of 44,300 kJ/kg, and combustion efficiency  At the start of the compression stroke, conditions in the cylinder combustion chamber are 100kPa and 600C. It can be assumed that there is a 4% exhaust residual left over from previous cycle. Find:

  1. Heat added during one cycle;
  2. Maximum temperature and pressure;
  3. Work produced in isentropic power stroke;
  4. Work produced during isentropic compression stroke;
  5. Indicated thermal efficiency;
  6. Brake power at 3000rpm; and
  7. Break mean effective pressure
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