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A four cylinder 2.5liter 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 valve of 44,300kJ/kg and a combustion efficiency ƞc=100%. At the start of the compression stroke, conditions of the cylinder combustion chamber are 100kPa and 60°C. It can be assumed that there is a 4% exhaust residual left over from the previous cycle. Calculate the:   (a) Complete thermodynamic engine analysis of the engine, (b) Net indicated work during one cycle in kJ, (c) Indicated thermal efficiency

A four cylinder 2.5liter 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 valve of 44,300kJ/kg and a combustion efficiency ƞc=100%. At the start of the compression stroke, conditions of the cylinder combustion chamber are 100kPa and 60°C. It can be assumed that there is a 4% exhaust residual left over from the previous cycle. Calculate the:   (a) Complete thermodynamic engine analysis of the engine, (b) Net indicated work during one cycle in kJ, (c) Indicated thermal efficiency

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 2.5liter 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 valve of 44,300kJ/kg and a combustion efficiency ƞc=100%. At the start of the compression stroke, conditions of the cylinder combustion chamber are 100kPa and 60°C. It can be assumed that there is a 4% exhaust residual left over from the previous cycle. Calculate the:  

(a) Complete thermodynamic engine analysis of the engine, (b) Net indicated work during one cycle in kJ, (c) Indicated thermal efficiency  

 

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