A compression ignition engine operates has a compression ratio of 30 and uses air as the working fluid, the cut-off ratio is 1.5. The air at the beginning of the compression process is at 100 kPa and 30 C. If the maximum temperature of the cycle is 2000 °C. Assume cold air standard assumptions at room temperature (i.e., constant specific heat). A. Describe with the aid of diagrams the operational sequence of four stroke compression ignition engines. B. Explain the mechanical efficiency for an ideal diesel cycle of two and four stroke engines C. Explain the relationship between thermal efficiency (n), compression ratio (r), and cut-off ratio (rc).

Elements Of Electromagnetics
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Author:Sadiku, Matthew N. O.
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A compression ignition engine operates has a compression ratio of 30 and uses air as the working
fluid, the cut-off ratio is 1.5. The air at the beginning of the compression process is at 100 kPa and 30
C. If the maximum temperature of the cycle is 2000 °C. Assume cold air standard assumptions at
room temperature (i.e., constant specific heat).
A. Describe with the aid of diagrams the operational sequence of four stroke compression
ignition engines.
B. Explain the mechanical efficiency for an ideal diesel cycle of two and four stroke engines
C. Explain the relationship between thermal efficiency (n), compression ratio (r), and cut-off
ratio (re).
D. Determine the net-work output, the thermal efficiency, and the mean effective pressure for the
cycle.
E. Determine the mean effective pressure (kPa) and net-power output (kW) in the cycle if a two-
stroke engine is being used instead of a four-stroke engine.
Transcribed Image Text:Task 2 A compression ignition engine operates has a compression ratio of 30 and uses air as the working fluid, the cut-off ratio is 1.5. The air at the beginning of the compression process is at 100 kPa and 30 C. If the maximum temperature of the cycle is 2000 °C. Assume cold air standard assumptions at room temperature (i.e., constant specific heat). A. Describe with the aid of diagrams the operational sequence of four stroke compression ignition engines. B. Explain the mechanical efficiency for an ideal diesel cycle of two and four stroke engines C. Explain the relationship between thermal efficiency (n), compression ratio (r), and cut-off ratio (re). D. Determine the net-work output, the thermal efficiency, and the mean effective pressure for the cycle. E. Determine the mean effective pressure (kPa) and net-power output (kW) in the cycle if a two- stroke engine is being used instead of a four-stroke engine.
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