Problem 3: An Otto cycle engine installed in a truck has a volume compression ratio of 8 and provides agas 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. Thespecific heat values are; C₂ = 1004.0J/kg · K, and C₂ = 717 J/kg. K. Assume that the ratio of fuelmileage to cycle efficiency is constant. Evaluate the following, (assume that you have access to fuel thatwill 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 increasein engine compression ratio? Base your answer on the required cycle efficiency.

To find: a) The value of gas mileage when compression ratio is 12. b) The value of gas mileage when…

Answered: Problem 3: An Otto cycle engine…

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 compression ratio of 8 is achieved by using an ideal air-standard Otto cycle engine. The working fluid has a pressure of 100 kPa and a temperature of 27°C at the start of the compression process, and the constant volume heat addition process supplies 800 kJ/kg of heat to the working fluid. What are the (a )the temperature, volume and pressure of the air at the end of each process (in K, m3 and kPa) (b) the net work output/cycle [kJ/kg], and (c) the thermal efficiency of this engine cycle
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An ideal Diesel cycle has the air inlet temperature and pressure of 23 0C and 92 kPa respectively. The compression ratio is 18:1 while the maximum cycle temperature is 1,295 0C. Take Specific heat at constant pressure and constant volume for air as 1.006 kJ/kg K and 0.716 kJ/kg K respectively. Calculate the specific work output from the engine to one decimal place and include the correct SI unit (kJ, kg, K )

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