Q5: A high speed Diesel engine working on ideal Dual combustion cycle takes in airat a pressure of (1 bar) and temperature of (50 °C) and compresses it adiabatically to(1/14) of its original volume. At the end of the compression the heat is added in sucha manner that during the first stage the pressure increases at constant volume totwice the pressure of the adiabatic compression, and during the second stagefollowing the constant volume addition, the volume is increased twice the clearancevolume at constant pressure. The air is then allowed to expand adiabatically to theend of the stroke where it is exhausted, heat being rejected at constant volume.Calculate (a) the temperature at the key points of the cycle, and (b) the ideal thermalefficiency. Answers [(a) T2-930K, T3-1860K, T4-3720K, T=1710K (b) 60.8 %]

Efficiency = 0.608 × 100 = 60.8%

Answered: Q5: A high speed Diesel engine working…

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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3 The total volume displaced in the cylinder for a Carnot Cycle is easily determined with Isothermal expansion ratio True False
A four-cylinder compression-ignition engine with a compression ratio of 18 haspistons with a bore of 9 cm and a stroke of 10 cm. The air pressure at the beginning ofcompression is 98 kPaa, and the temperature is 37 oC. The engine may be modeled bythe air-standard Diesel 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.
5. An ideal diesel cycle has a compression ratio of 16 to 1. The maximum cycle temperature is1700°C and the minimum cycle temperature is 15°C. Calculate:a. the specific heat transfers to the cycleb. the specific work of the cyclec. the thermal efficiency of the cycle
A gasoline internal combustion engine can be modeled by an ideal Otto cyclethat has a compression ratio of 8.91. At the beginning of the compression process (state 1), airis at 100 kPa and 300 K. The heat transfer into the air during the constant-volume heat additionprocess (state 2 to 3) is 693.08 kJ/kg. Note: Consider constant specific heats of air at 300 K. 1 – Find the temperature in K before heat additionprocess ;A) 660 KB) 680 KC) 700 KD) 720 K 2 – Find the maximum temperature in K during thecycle A) 1625 KB) 1655 KC) 1685 KD) 1715 K3 – Find the maximum pressure in MPa during the cycle A) 4 MPaB) 4.5 MPaC) 5 MPaD) 5.5 MPa4 – Find the temperature in K before the heat rejection processA) 660 KB) 700 KC) 740 KD) 780 K
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.
5. (a) If the compression ratio of an engine working on Otto cycle isIncreased from 5 to 7, find the percentage increase in thermalefficiency. (b) Derive an expression for thermal efficiency of ideal Brayton cycle.(c) In an engine working on the ideal Otto cycle, the pressure and temperature at the beginning of compression are 100 kPa and 40 °C respectively. The ratio of specific heat capacities is 1.4. If the airstandard efficiency of the engine is 50%, determine(i) The compression ratio. (ii) The pressure and temperature at the end of adiabaticcompression. (6a) Explain and discuss in your own words, the following three concepts incombustion: stoichiometric mixture of air and fuel, weak mixture and richmixture. Explain their importance in combustion applications.(6b) A gas fuel has the following volumetric composition:Propane C3H8: 73 %Butane C4H10: 5 %Ethane, C2H6: 3%Nitrogen N2: 19%(i) Write out the complete combustion equations for all the combustible constituents individually.…
The compression ratio of an Otto cycle is 8, at the beginning of the zanthropic compression process, the pressure of the air is 100 kPa, the temperature is 27 "C, the volume is 550 cm. At the end of the lzantropic expansion process, the temperature of the air is 700 K. Using the specific temperature values at room temperature (according to the cold air standard assumptions) Find the gravity of the air.
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
Sketch and label Pv and Ts diagrams
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(17 blanks) Calculate the efficiency of the Carnot Engine for ideal gas. Consider the figure below for a complete cycle of Carnot engine, where the cycle goes from ad->ab->bc->cd

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