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).

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

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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Concept explainers

IC engines

The term "engine" indicates a mechanical device/machine used to convert input energy to a specific mechanical output. The input energy may be in the form of chemical energy, thermal energy, or so on and mechanical output is in the form of mechanical energy (work done). Generally, the engines classify into two groups which are internal combustion type and external combustion type, and further, these two types can be classified into two types that are reciprocating and rotary engines.

Question

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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