A maximum ignition delay Tid of 20° is required for acceptable cold start ignition of an automobile diesel engine. The engine stroke is 80 mm, the cranking speed Wis 200 rpm, and the polytropic coefficient n for compression to top dead center is 1.20. The fuel cetane number is 45, and the inlet air temperature and pressure are 250 K and 1 bar. What is the minimum compression ratio needed to have an ignition delay no longer than 20°?
A maximum ignition delay Tid of 20° is required for acceptable cold start ignition of an automobile diesel engine. The engine stroke is 80 mm, the cranking speed Wis 200 rpm, and the polytropic coefficient n for compression to top dead center is 1.20. The fuel cetane number is 45, and the inlet air temperature and pressure are 250 K and 1 bar. What is the minimum compression ratio needed to have an ignition delay no longer than 20°?
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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Transcribed Image Text:A maximum ignition delay Tid of 20° is required for acceptable cold start
ignition of an automobile diesel engine. The engine stroke is 80 mm, the
cranking speed Wis 200 rpm, and the polytropic coefficient n for
compression to top dead center is 1.20. The fuel cetane number is 45,
and the inlet air temperature and pressure are 250 K and 1 bar. What is
the minimum compression ratio needed to have an ignition delay no
longer than 20°?
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