A four-stroke cycle gas engine has a bore of 20 cm and a stroke of 40cm. The compression ratio is 6. In a test on the engine the indicatedmean effective pressure is 5 bar, the air to gas ratio is 6:1 and thecalorific value of the gas is 12 MJ/m3 at NTP. At the beginning ofthe compression stroke the temperature is 77 °C and pressure 0.98 bar.Neglecting residual gases, determine the indicated power, the thermalefficiency and the relative efficiency of the engine at 250 rpm.

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Answered: A four-stroke cycle gas engine has a…

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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Temperature, Pressure and Volume of air (Y=1.4) at the end of isentropic compression in an air standard Carnot heat engine cycle are 315.6 °C, 120 kPa and 0.05 m³ respectively. The volumetric ratio of the isothermal expansion (2-3) and that of isothermal compression ( V₁ ¹₁-3). The volumetric ratio the isentropic expansion (¹-6) and that of isothermal V/₂ compression (¹= 6). (Please draw a P-V diagram of the Carnot cycle) V₁ Calculate; a) The pressure, minimum Temperature and volumes of other states of the Carnot cycle. [ + b) The heat supplied and rejected by the cycle c) The efficiency of the cycle 星

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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
14 A six-cylinder SI engine with a compression ratio of 10.5:1 operates on a four-stroke cycle at 3000 RPM. Air enters the cylinders at T = 110 F and P 12.8 psia. The intake valve closes at 20° aBDC and combustion starts when the spark plug fires at 15° 6TDC. Con- necting rod length is 6.64 in. and crank offset is 1.66 in. Calculate: (a) Cylinder temperature at start of combustion using air-standard Otto cyde analysis ['F] (b) Cylinder temperature when spark plug fires assuming compression doesn't start until intake valve closes. [F]
An oil engine working on a dual combustion cycle, has a compression ratio of 16: 1 and the cut-off takes place at 6% of the stroke. The maximum pressure obtained is 70 bar. The pressure and temperature at the beginning of compression are 1 bar and 110°C respectively. Determine the pressure and teperature at all the important points of the cycle. Assume R = 0.287 kJ/(kg K) and c, = (0.716+ 125 x 10-67) kJ/(kg K)
An ideal Diesel cycle has the air inlet temperature and pressure of 25 °C and 92 kPa respectively. The compression ratio is 18:1 while the maximum cycle temperature is 1,127 °C. Take Specific heat at constant pressure and constant volume for air as 1.008 kJ/kg K and 0.713 kJ/kg K respectively. Calculate the absolute temperature after the isentropic compression process to one decimal place and include the correct unit (absolute temperature). Add units
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 2250 K. Assume constant specific heats evaluated at 300 K. Determine the mean effective pressure, in kPa.
A turboshaft engine comprising a gas generator and a free power turbine is selected to provide propulsive power for a helicopter. The helicopter is hovering in ISA conditions at an altitude of 4100 feet. The following data applies to this engine at this static max power operating point. Intake mass flow: 8.9 kg/s Compressor pressure ratio: 24.5 Compressor isentropic efficiency: 88% Mechanical efficiency: (HP & PT shaft) 99% Combustion chamber pressure loss Combustion chamber inlet pressure 4% Combustion efficiency 98.8% Combustion chamber exit temperature: 1585K Gas generator turbine isentropic efficiency: 92% Power turbine isentropic efficiency: 90% The effects of the intake and exhaust ducts may be ignored. It may be assumed that for: Air: Cp = 1.005 kJ/kg • K, y = 1.4, R = 0.287 kJ/kg • K Combustion gases: Cp = 1.148kJ/kg • K, y = 1.333, R = 0.287 kJ/kg • K A 6% direct bleed of air from the exit of the compressor is…
The pressure and temperature at the beginning of compression of an air-standard Diesel cycle are 90 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 6821 kPa and the temperature is 1950 K. The Compression Ratio is 23.24 Determine the compression ratio.
In an ideal diesel cycle the pressure and temperature at the beginning of the adiabatic compression are 98.5kN/m^3 and 60°c, respectively.themaximum pressure attained during the cycle is 4.5MN/m^3 and the heat received during the cycle is 580kJ/kg gas.Determine for the cycle a) the volume ratio of compression b) the temperature at the end of compression c) the temperature at the end of heat reception d) the temperature at the end of adiabatic expansion e) the net work done/kg of gas f) the thermal efficiency g) the work ratio h) the mean effective pressure I) the Carnot efficiency within the cycle temperature limits.

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