Discuss the difference between the ideal and the actual indicator diagrams of four stroke SI engine.

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samet mamat answered 2 years ago

Design a four stroke cycle for SI engine using crankcase compression. Draw schematics of the six...

Design a four stroke cycle for SI engine using crankcase compression. Draw schematics of the six basic process: intake, compression, combustion, expansion, blowdown and exhaust. Describe fully the intake of air, fuel and oil.

An ideal four stroke Otto cycle engine has 6 cylinders and a displacement of 4 Liters....

An ideal four stroke Otto cycle engine has 6 cylinders and a displacement of 4 Liters. It has a compression ratio of 8.5:1. If the mean effective pressure is 4000 kPa when operating at 3000 rpm, what will be the indicated power and what is the required heat transfer to the engine from a combusting fuel?

1) A four-stroke diesel engine has a piston diameter of 16.5 cm and a stroke of...

1) A four-stroke diesel engine has a piston diameter of 16.5 cm and a stroke of 27 cm. The compression ratio is 14.3, the cut-off 4.23% of the stroke and the mean effective pressure 4.12 bar. The engine speed is 264 rev/min and the fuel consumption is 1.076 kg of oil per hour, having a calorific value of 39150 kJ/kg. Calculate the relative efficiency of the engine 2). A diesel engine has a brake thermal efficiency of 30%. If the...

During the power stroke in a four-stroke automobile engine, the pis-ton is forced down as the...

During the power stroke in a four-stroke automobile engine, the pis-ton is forced down as the mixture of combustion products and air undergoes an adiabatic expansion. Assume (1) the engine is running at 2500 cycles/min; (2) the pressure immediately before the expansion is 20.0 atm; (3) the volumes of the mixture immediately before and after the expansion are 50.0 cm3and 400 cm3, respectively ; (4) the time interval for expansion is one-fourth that of the total cycle; and (5) the...

A single-cylinder, four stroke research engine operates on Otto cycle. The specification of the engine is...

A single-cylinder, four stroke research engine operates on Otto cycle. The specification of the engine is shown as below:- Displacement volume of the cylinder = 540 cm3 Clearance volume of the cylinder = 60 cm3 Minimum temperature = 200°C Minimum pressure = 200 kPa Net work output = 1000 kJ/kg Sketch the process on a P-V diagram and by using constant specific heat at room temperature, determine: i) the temperature and pressure at each process, ii) the thermal efficiency of...

A two-cylinder, four-stroke gas engine has a bore of 380 mm and a stroke of 585...

A two-cylinder, four-stroke gas engine has a bore of 380 mm and a stroke of 585 mm. At 240 rev/min the torque developed is 11.86 kNm. If the engine is supplied with a mixture of gas and air in the proportion of 1 to 7 by volume. The estimated volumetric efficiency is 85% and the Qnet,p of the gas is 38.6 MJ/m3. Calculate the brake thermal efficiency of the engine.

A four-cylinder four-stroke engine is operating at a bmep of 2 bar. The pressure at inlet...

A four-cylinder four-stroke engine is operating at a bmep of 2 bar. The pressure at inlet valve closure is 0.37 bar, and the fmep is 0.8 bar. Assuming that the engine gross indicated efficiency is unchanged, verify that disablement of the valves on two cylinders would reduce the fuel consumption by about 13 per cent compared with about an 8 per cent fuel saving if the fuel was not supplied to two cylinders. Assume that the gross imep is proportional...

A four-stroke engine is running on methane with an equivalence ratio of 0.8. The air and...

A four-stroke engine is running on methane with an equivalence ratio of 0.8. The air and fuel enter the engine at 250 C, the exhaust is at 5270 C, the heat rejected to the coolant is 340 MJ/kmol of fuel.(a)Write the equations for stoichiometric and actual combustion.(b)By calculating the enthalpy of the exhaust flow, deduce the specific work output of the engine, and thus the overall efficiency. (c)If the engine has a swept volume of 5 Litres, and volumetric efficiency...

a)State the ideal cycle most appropriate to the actual operations undergone the modem Diesel engine ....

a)State the ideal cycle most appropriate to the actual operations undergone the modem Diesel engine . b)give reasons why the actual cycle is made approximate to the ideal heat exchange process. c) state how the combustion process in the actual cycle is made approximate to the ideal heat exchange process.

15. A four stroke oil engine developing 75 kW at 300 r.p.m is to have the...

15. A four stroke oil engine developing 75 kW at 300 r.p.m is to have the total fluctuation of speed limited to 5%. Two identical flywheels are to be designed. The workdone during the power stroke is found to be 1.3 times the average workdone during the whole cycle. The turning moment diagram can be approximated as a triangle during the power stroke. Assume that the hoop stress in the flywheel and the bending stress in the arms should not...

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