ME476_Exam5

ME476_Exam5 - ICE 476/676 – CHAPTERS 9 & 10 Exam...

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December 2, 2010 85 pts NAME_______________________________________________ No Notes, Calculators or Books Allowed. Neatness Counts!!! 1. (7pts) Combustion in an SI engine can be divided into three distinct phases: 1) Ignition and flame development, 2) flame propagation, and 3) flame termination. Describe how the following parameters affect flame propagation (i.e., increase or decrease speed and length of propagation time). a. (1pt) Turbulence b. (1pt) Air Fuel Ratio c. (1pt) Engine Speed d. (4 pts) The following figure shows both the fraction of cylinder volume enflamed (V f /V) and the mass fraction burned (x b ) with respect to crank angle during combustion. Label each curve and provide a brief description of why you chose each. 2. (3pts) What is the difference between Octane number and Cetane number? What would happen if you were to use a high Cetane number fuel in an SI engine? 3.
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ME476_Exam5 - ICE 476/676 – CHAPTERS 9 & 10 Exam...

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