Q-2An air-standard Diesel cycle has a compression ratio of 18.2.Air is at 27°C and o.IMPa at the beginning of the compression processand at 200ok at the end of the heat addition process. Determine@The cutoff ratio ⑥The heat rejection per unit mass thermal efficie

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Answered: Q-2 An air-standard Diesel cycle has a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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art Il: Power Cycles & Fluid Assume an Otto cycle with compression ratio of CR = 9 1. The intake air is at 100kPa, 20°C, and the volume of the chamber is 500cm prior to the compression stroke. The temperature at the end of the adiabatic expansion is T. 800K. If air specific heat capacity at constant pressure of air at atmospheric pressure and room temperature is c 1.01KJ/kgK Specific heat capacity at constant volume of air at atmospheric pressure and room temperature: Cy = 0.718KJ/kgK Calculate: (i) the mass of the intake air (ii) the temperature T3, (iii) the pressure pa, (iv) the amount of heat added by burning fuel-air mixture (v) the thermal efficiency of the cycle;B (vi) the mean effective pressure (MEP).
In an ideal Diesel Cycle, the temperature of the air at the beginning of compression is 320 K and the pressure is 100 kPa. The maximum temperature of this cycle with isotropic compression ratio of 15 ; A-)2500K B-)2000K Find the temperatures and pressures that are not given according to the situation, the heat given for 1kg of air, the net work and the average effective pressure. Draw the diagrams P-v and T-S.
Q3:A small truck has #cylinder ,4 liter compression ignition engine that operates on irstandard Dual cycle with air fuel ratio of 16:1, the compression ratio is 17 and the cylinderdiameter is 14.5Cm. At the start of compression stroke Ta=5O'C and Pa=100 kpa .It can beassumed the half of the heat input is added at constant volume and halt at constant pressureCalculate:-Temperature and pressure at each state of the cycle. -Indicated thermal efficiency.
A four-cylinder spark-ignition engine with a compression ratio of 8 has a pistonswith a bore of 9 cm and a stroke of 10 cm. The air pressure at the beginning of thecompression is 98 kPa, and the temperature is 37 oC. The engine may be modeled by theair-standard Otto cycle. The maximum cycle temperature is 1700 oK. If the engineproduces 75 kW of power, determine a) the heat supplied per cylinder; b) the thermalefficiency; and c) the rpm required.
In a C.I. engine working on the dual combustion cycle the compression ratio is 12.5:1. Air at 101.3kPa and 35°C is compressed adiabatically. Fuel is then added until the pressure reaches 4000kPa, then at constant pressure to a temperature of 1425°C. After adiabatic expansion to the initial volume exhaust takes place. Calculate: (a). work done/kg air (b). thermal efficiency
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A turbojet aircraft moving with a velocity of 790 ft/s at a runway where the pressure& temperature is found to be 14.7psi & 546R. The axial flow compressor provides apressure ratio of 14 to 1. Temperature at the turbine inlet is 2000R. The mass flowrate of airinside the engine is 133 lbm/s. Determine the following:a. T-S diagramb. Pressure & temperature at each statec. Thrust force (lbf)d. Propulsive power developed (BTU/min)e. Propulsive Efficiency
Instead, assume variable specific heat An ideal Diesel cycle has a compression ratio of 17and a cutoff ratio of 1.3. Determine the maximum tempera-ture of the air and the rate of heat addition to this cycle whenit produces 140 kW of power and the state of the air at thebeginning of the compression is 90 kPa and 578C. Use con-stant specific heats at room temperature
The beginning of the compression stroke for an air standard Diesel cycleis at 98 kPa and 26oC. For a maximum cycle temperature of 2550oC anda compression ratio of 18, find (a) thermal efficiency (b) mep.
An engine working on the Otto Cycle has a compression ratio of 10/. At the beginning of the compression stroke the temperature of the air is 30oC. After the addition of heat constant volume the temperature of the air rises to 1100 oC. Find the heat supplied, heat rejected & the net work done per kilogram of air in the cylinder. What is the efficiency of the cycle?
Q-4 An air standard Diesel cycle that has acompression ratio of 18 and the cut off ratio of 2.1. At the beginning of the compression Process, the temperature, pressure and volume are 300k, lookpa and 0.005m³ respectively. Calculate ①maximum pressure The temperature at the end of adiabatic expansion 3 work mean effective pressure. For air take Cp = 1.0035 kj/kg.k and R = 0.287 Ki/kg k done
Brayton Cycle:18. An air standard Brayton cycle operates with compression ratio of 6 and temperature at the start and end of heat addition are 170°C and 820°C. Find the temperature at the end of expansion.

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Q-2 An air-standard Diesel cycle has a compression ratio of 18.2. Air is at 27°C and o.IMPa at the beginning of the compression process and at 200ok at the end of the heat addition process. Determine @The cutoff ratio ⑥The heat rejection per unit mass thermal efficie