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Otto Cycle 1. Why are high compression ratios not used in spark ignition engines? 2. How does the thermal efficiency of an ideal Otto cycle change with the compression ratio of the engine and the specific heat ratio of the working fluid? 3. At the beginning of the compression process of an air standard Otto cycle, p₁ = 1 bar, T₁=290 K, V₁ = 400 cm³. The maximum temperature in the cycle is 2200 K and the compression ratio is 8. Determine: (a) the heat addition, in kJ. (b) the net work, in kJ. (c) the thermal efficiency. (d) the mean effective pressure, in bar.

Otto Cycle 1. Why are high compression ratios not used in spark ignition engines? 2. How does the thermal efficiency of an ideal Otto cycle change with the compression ratio of the engine and the specific heat ratio of the working fluid? 3. At the beginning of the compression process of an air standard Otto cycle, p₁ = 1 bar, T₁=290 K, V₁ = 400 cm³. The maximum temperature in the cycle is 2200 K and the compression ratio is 8. Determine: (a) the heat addition, in kJ. (b) the net work, in kJ. (c) the thermal efficiency. (d) the mean effective pressure, in bar.

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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Otto Cycle 1. Why are high compression ratios not used in spark ignition engines? 2. How does the thermal efficiency of an ideal Otto cycle change with the compression ratio of the engine and the specific heat ratio of the working fluid? 3. At the beginning of the compression process of an air standard Otto cycle, p₁ = 1 bar, T₁=290 K, V₁ = 400 cm³. The maximum temperature in the cycle is 2200 K and the compression ratio is 8. Determine: (a) the heat addition, in kJ. (b) the net work, in kJ. (c) the thermal efficiency. (d) the mean effective pressure, in bar.
Transcribed Image Text:Otto Cycle 1. Why are high compression ratios not used in spark ignition engines? 2. How does the thermal efficiency of an ideal Otto cycle change with the compression ratio of the engine and the specific heat ratio of the working fluid? 3. At the beginning of the compression process of an air standard Otto cycle, p₁ = 1 bar, T₁=290 K, V₁ = 400 cm³. The maximum temperature in the cycle is 2200 K and the compression ratio is 8. Determine: (a) the heat addition, in kJ. (b) the net work, in kJ. (c) the thermal efficiency. (d) the mean effective pressure, in bar.
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