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. A 4 stroke 4 cylinder spark ignition engine runs on a stoichiometric mixture of ethanol and air...
Α 4-stroke spark-ignition engine has a compression ratio of 10 and operates on the ideal constant...
Α 4-stroke spark-ignition engine has a compression ratio of 10 and operates on the ideal constant volume cycle with intake pressure of 50 kPa (throttled) and intake temperature of 300 K. The exhaust pressure is 100 kPa. The heat input from combustion is 2500 kJ/kg and γ = 1.3 for the working fluid. a. Draw the p-V diagram of the full cycle and indicate all the processes. b. Calculate the residual gas fraction and the temperature decrease during the exhaust...
In a four-stroke spark ignition engine, calculate the engine speed in RPM if the spark plug...
In a four-stroke spark ignition engine, calculate the engine speed in RPM if the spark plug fires 16 times per second.
2. (Pts 30) A six cylinder, four stroke, spark ignition engine operating on the ideal Otto...
2. (Pts 30) A six cylinder, four stroke, spark ignition engine operating on the ideal Otto cycle takes in air at 1 atm and 18°C, and is limited to a maximum cycle temperature of 871°C. Each cylinder has a bore of 8.9 cm, and each piston has a stroke of 9.9 cm. The top dead center is 14 percent of the bottom dead center. Under these conditions, how much power will this engine produce when operated at 2500 rpm? Use...
Consider a mixture of ethanol (CH3OH) with gasoline for use as a spark-ignition engine fuel. Assume...
Consider a mixture of ethanol (CH3OH) with gasoline for use as a spark-ignition engine fuel. Assume that the mixture contains 40 % ethanol by volume, whereas gasoline has a molecular weight of 105 kg/kmol and contains 86 % carbon and 14 % hydrogen on a mass basis. Calculate the stoichiometric air/fuel ratio on a mass basis for this fuel mixture.
A four-stroke 2.0 Litre compression ignition engine operates on a Diesel cycle with a compression ratio...
A four-stroke 2.0 Litre compression ignition engine operates on a Diesel cycle with a compression ratio of 20 and a cut-off ratio of 1.8. Air is at 30°C and 100 kPa at the beginning of the compression process. It may be assumed that for the air, the specific heat, Cp and gas constant, R are 1.005 and 0.287 kJ/kg.K, respectively. Calculate: the temperature (K) of the air at the end of the following processes: (i) (a) compression (ii) combustion, (ii...
A 4 stroke spark ignition engine gave the following results during a test. Number of cylinders...
A 4 stroke spark ignition engine gave the following results during a test. Number of cylinders 6 Bore of cylinders 90 mm Stroke 80 mm Speed 5000 rev/min Fuel consumption rate 0.3 dm/min Fuel density 750 kg/m Calorific value 44 MJ/kg Net brake load 180 N Torque arm 0.5 m Net indicated area 720 mm Base length of indicator diagram 60 mm Pressure scale 40 kPa/mm Calculate the following. The Brake Power. ii) The Mean effective Pressure. The Indicated Power....
Problem 6. Compute the brake mean effective pressure of a four-cylinder, two-stroke engine, 100 mm bore...
Problem 6. Compute the brake mean effective pressure of a four-cylinder, two-stroke engine, 100 mm bore 125 mm stroke when it develops a torque of 490 Nm. Problem = 7. Find the brake thermal efficiency of an engine which consumes 7 kg of fuel in 20 minutes and develops a brake power of 65kW. The fuel has heating value of 42000 kJ/kg. Problem # 8. Find the mean piston speed of a diesel engine running at 1500 rpm. The engine...
1. A 12-cylinder, 4-stroke automobile engine is being designed. What type of cylinder arrangement would you...
1. A 12-cylinder, 4-stroke automobile engine is being designed. What type of cylinder arrangement would you recommend? (a) In-Line (b) V-Type (c) W-Type (d) Rotary. 2. The expression "cylinder cut-out" means : (a) Half of cylinder volumes is used. (b) Half of cylinder numbers is used. (c) Half of cylinder masses is used. (d) None of the above. 3. Adding lubrication oil to the inlet fuel- air mixture in 2-st engines will increase: (a) HC emissions. (b) CO emissions (c)...
4. A4.6 L spark ignition engine operates on the ideal Otto cycle with a compression ratio of 10. At the beginning of the compression process the air is at 107 kPa and 21 C. The maximum cycle temp...
4. A4.6 L spark ignition engine operates on the ideal Otto cycle with a compression ratio of 10. At the beginning of the compression process the air is at 107 kPa and 21 C. The maximum cycle temperature is 1116°C. Accounting for variable specific heats, determine: (a) the heat addition per cycle in kJ. Ans: 3.368 kJ (b) the net work per cycle in kJ. Ans: 1.907 kJ (c) the mean effective pressure in kPa. Ans: 460.6 kPa (d) the...
The following information is available for an aircraft four-stroke reciprocating engine: indicat...
The following information is available for an aircraft four-stroke reciprocating engine: indicated mean effective pressure (IMEP) = 160 psi stroke = 5 in bore = 5 in engine rpm = 3000 number of cylinders = 9 cylinder clearance volume = 15 in3 engine mechanical efficiency, ηmech = 90% propeller efficiency, ηprop = 80% Calculate brake horsepower (BHP) indicated horsepower (IHP) thrust horsepower (THP) friction horsepower (FHP) brake mean effective pressure (BMEP) Compression Ratio (is your answer reasonable for a spark...
2. (Pts 30) A six cylinder, four stroke, spark ignition engine operating on the ideal Otto cycle takes in air at 1 atm and 18°C, and is limited to a maximum cycle temperature of 871°C. Each cylinder has a bore of 8.9 cm, and each piston has a stroke of 9.9 cm. The top dead center is 14 percent of the bottom dead center. Under these conditions, how much power will this engine produce when operated at 2500 rpm? Use...
Consider a mixture of ethanol (CH3OH) with gasoline for use as a spark-ignition engine fuel. Assume that the mixture contains 40 % ethanol by volume, whereas gasoline has a molecular weight of 105 kg/kmol and contains 86 % carbon and 14 % hydrogen on a mass basis. Calculate the stoichiometric air/fuel ratio on a mass basis for this fuel mixture.
A four-stroke 2.0 Litre compression ignition engine operates on a Diesel cycle with a compression ratio of 20 and a cut-off ratio of 1.8. Air is at 30°C and 100 kPa at the beginning of the compression process. It may be assumed that for the air, the specific heat, Cp and gas constant, R are 1.005 and 0.287 kJ/kg.K, respectively. Calculate: the temperature (K) of the air at the end of the following processes: (i) (a) compression (ii) combustion, (ii...
A 4 stroke spark ignition engine gave the following results during a test. Number of cylinders 6 Bore of cylinders 90 mm Stroke 80 mm Speed 5000 rev/min Fuel consumption rate 0.3 dm/min Fuel density 750 kg/m Calorific value 44 MJ/kg Net brake load 180 N Torque arm 0.5 m Net indicated area 720 mm Base length of indicator diagram 60 mm Pressure scale 40 kPa/mm Calculate the following. The Brake Power. ii) The Mean effective Pressure. The Indicated Power....
Problem 6. Compute the brake mean effective pressure of a four-cylinder, two-stroke engine, 100 mm bore 125 mm stroke when it develops a torque of 490 Nm. Problem = 7. Find the brake thermal efficiency of an engine which consumes 7 kg of fuel in 20 minutes and develops a brake power of 65kW. The fuel has heating value of 42000 kJ/kg. Problem # 8. Find the mean piston speed of a diesel engine running at 1500 rpm. The engine...
1. A 12-cylinder, 4-stroke automobile engine is being designed. What type of cylinder arrangement would you recommend? (a) In-Line (b) V-Type (c) W-Type (d) Rotary. 2. The expression "cylinder cut-out" means : (a) Half of cylinder volumes is used. (b) Half of cylinder numbers is used. (c) Half of cylinder masses is used. (d) None of the above. 3. Adding lubrication oil to the inlet fuel- air mixture in 2-st engines will increase: (a) HC emissions. (b) CO emissions (c)...
4. A4.6 L spark ignition engine operates on the ideal Otto cycle with a compression ratio of 10. At the beginning of the compression process the air is at 107 kPa and 21 C. The maximum cycle temperature is 1116°C. Accounting for variable specific heats, determine: (a) the heat addition per cycle in kJ. Ans: 3.368 kJ (b) the net work per cycle in kJ. Ans: 1.907 kJ (c) the mean effective pressure in kPa. Ans: 460.6 kPa (d) the...
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