Part 2 A compression ignition engine operates on a diesel cycle has a compression ratio of 20 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. Under cold air standard assumptions at room temperature. 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 (r.).

Part 2 A compression ignition engine operates on a diesel cycle has a compression ratio of 20 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. Under cold air standard assumptions at room temperature. 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 (r.).

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 ignition engine operates on a diesel cycle has a compression ratio of 20 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 ºC. Under cold air standard assumptions at room temperature. 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 (?), compression ratio (r), and cut-off ratio (rc).
An Engine operates on the air-standard Diesel cycle. The compression ratio is 18. Thepressure and temperature at the start of compression process is 100 kPa and 300 K. theheat added is (1800 + X) kJ/kg of air. Utilizing the air-standard assumption determine:(i) the maximum pressure and temperature in the cycle,(ii) the thermal efficiency;(iii) the mean effective pressure.
At the beginning of the compression process of an air—standard Diesel cycle operating with a compression ratio of 18, the temperature is 300 K and the pressure is 0.1 MPa. The cutoff ratio for the cycle is 2. Determine (a) the maximum temperature and pressure at the cycle. (b) Determine the thermal efficiency, (c) Determine the mean effective pressure, in atm.
An IC engine working on dual combustion cycle has a compression ratio of 8. At the beginning of the cycle the pressure and temperature of air is 1 bar and 350 Krespectively while the maximum pressure is limited to 70 bar. The total heat added is 1500 kJ/kg of air. Determine the pressure and temperature at all salient points, the air standard efficiency, and the mean effective pressure.
The pressure and temperature at the beginning of compression of an air-standard Diesel cycle are 80 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 6821 kPa and the temperature is 2250 K. a. compression ratiob. cutoff ratioc. thermal efficiencyd. mean effective pressure The correct compression ratio is 25.36
Determine the air – standard efficiency of an engine operating on the diesel cycle when the suction pressure is 99.97KPa and the fuel injected for 6% of the stroke, the clearance volume is 8% of the stroke. Assume k = 1.4.
A spark ignition engine that operates on Otto cycle has a compression ratio of 10. At the beginningof the compression process, air is at 100 kPa and 25 C. 750 kJ/kg of heat is transferred to air duringthe constant-volume heat-addition process. Consider the variation of specific heats withtemperature. (a) Describe with the aid of diagrams the operational sequence of four stroke spark ignitionengines (b) Explain the mechanical efficiency for ideal otto cycle of two and four stroke engines (c) What is the difference between four and two stroke engines?(d) Explain the relationship between thermal efficiency (?) and compression ratio (r).(e) Why are high compression ratios not used in spark ignition engines?(f) Determine the pressure and temperature at the end of the heat addition process(g) Determine the net-work output, the thermal efficiency, and the mean effective pressure forthe cycle.
Calculate the maximum cycle temperature of a diesel cycle operating under air-standard circumstances. The compression ratio of the cycle is 16 and the cut-off ratio is 2.5.
I only need help with letter (d). The answer for letter (a) is 22.87. The answer for letter (b) is 1.9538. The answer for letter (c) is 66.71%. The pressure and temperature at the beginning of compression of a cold air-standard Diesel cycle are 90 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 7.2 MPa and the temperature is 2050 K. Assume constant specific heats evaluated at 300 K.Determine:(a) the compression ratio.(b) the cutoff ratio.(c) the percent thermal efficiency of the cycle.(d) the mean effective pressure, in kPa.
Task 04 b). Take γ for air as 1.4 for both. The compression ignition engine Assumed to be operating on ideal air-standard Diesel cycle has a compression ratio of 18 and a cut-off ratio of 2. At the beginning of the compression process, air is at 95kPa and 92 0C . Accounting for the variation of specific heats with temperature, i) determine the temperature after the heat-addition process ii) thermal efficiency. iii) using the available information determine the relative efficiency.
A 4.5 L four-cylinder diesel engine operates on the ideal Diesel cycle, with a compression ratio of 20 and a cut-off ratio of 20. It is 2.2. At the beginning of the compression process, the pressure of the air is 97 kPa and the temperature is 27 C. Calculate the post-combustion sickness of the air using the cold air standard assumptions. Options in the photo.
A diesel engine operating on the air-standard Diesel cycle has six cylinders of 100 mm bore and 120 mm stroke. The engine speed is 1800 rpm. At the beginning of compression, the pressure and temperature of air are 1.030bar and 35°C. If the clearance volume is 1/8th of the stroke volume, calculate (i) the pressure and temperature at the salient points of the cycle (ii)the compression ratio (iii) the efficiency of the cycle and (iv) the power output if the air is heated to 1500'C. Assume C, and C of air to be 1.004 and 0.717 kJ/kg K respectively.