Problem 3: An Otto cycle engine installed in a truck has a volume compression ratio of 8 and provides a gas mileage of 12 mpg at the vehicle's normal travelling speed of 40 mph. For purposes of this problem, the cycle can be assumed to be an ideal Otto cycle using air with fixed values of specific heats. The specific heat values are; Cp = 1004.0J/kg K, and C₂ = 717 J/kg. K. Assume that the ratio of fuel mileage to cycle efficiency is constant. Evaluate the following, (assume that you have access to fuel that will avoid problems such as auto ignition at the proposed increased compression ratios): a. What gas mileage can be expected if the engine compression ratio is increased to 12? b. What gas mileage can be expected if the engine compression ratio is increased to 16? c. Based on this model, what is the feasibility of trying to achieve 24 mpg solely through an increase in engine compression ratio? Base your answer on the required cycle efficiency.
Problem 3: An Otto cycle engine installed in a truck has a volume compression ratio of 8 and provides a gas mileage of 12 mpg at the vehicle's normal travelling speed of 40 mph. For purposes of this problem, the cycle can be assumed to be an ideal Otto cycle using air with fixed values of specific heats. The specific heat values are; Cp = 1004.0J/kg K, and C₂ = 717 J/kg. K. Assume that the ratio of fuel mileage to cycle efficiency is constant. Evaluate the following, (assume that you have access to fuel that will avoid problems such as auto ignition at the proposed increased compression ratios): a. What gas mileage can be expected if the engine compression ratio is increased to 12? b. What gas mileage can be expected if the engine compression ratio is increased to 16? c. Based on this model, what is the feasibility of trying to achieve 24 mpg solely through an increase in engine compression ratio? Base your answer on the required cycle efficiency.
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:Problem 3: An Otto cycle engine installed in a truck has a volume compression ratio of 8 and provides a
gas mileage of 12 mpg at the vehicle's normal travelling speed of 40 mph. For purposes of this problem,
the cycle can be assumed to be an ideal Otto cycle using air with fixed values of specific heats. The
specific heat values are; C₂ = 1004.0J/kg · K, and C₂ = 717 J/kg. K. Assume that the ratio of fuel
mileage to cycle efficiency is constant. Evaluate the following, (assume that you have access to fuel that
will avoid problems such as auto ignition at the proposed increased compression ratios):
a. What gas mileage can be expected if the engine compression ratio is increased to 12?
b.
What gas mileage can be expected if the engine compression ratio is increased to 16?
c. Based on this model, what is the feasibility of trying to achieve 24 mpg solely through an increase
in engine compression ratio? Base your answer on the required cycle efficiency.
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