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The answer is: 26.3% and 56.48 hp.
Problem 12: An actual four-stroke SI engine has a...
A 3 litre, four-stroke, four-cylinder CI engine running at 3000 rpm produces 48 kW of brake...
A 3 litre, four-stroke, four-cylinder CI engine running at 3000 rpm produces 48 kW of brake power. Brake thermal efficiency is 30% and the calorific value of fuel is 42 MJ/kg. Assume density of air at ambient condition is 1.1.81 kg/m3, air-fuel ratio 21:1 and mechanical efficiency 0.8. Determine: (a) Rate of fuel flow into the engine (kg/s) (b) Rate of air flow into the engine (kg/s) (c) Mass rate of exhaust flow (kg/s) (d) Volumetric efficiency (e) Indicated thermal...
INTERNAL COMBUSTION ENGINES Practice Problems ME 436 A 3 cylinder, 2.7 liter SI engine operates on...
INTERNAL COMBUSTION ENGINES Practice Problems ME 436 A 3 cylinder, 2.7 liter SI engine operates on a 4 stroke cycle at 3300 RPM with a compression ratio of 8.6:1. At the start of the compression stroke, the temperature is 47°C and the pressure is 82kPa. Assume 3% residual gases. The mechanical efficiency is 81%, combustion efficiency is 96%, and the air-fuel ratio is 16.3, and the fuel heating value is 43,000 kJ/kg. The combustion process starts at TDC and is...
2. Analyze an Audi 3.0-liter TDI V6 Biturbo diesel engine using an air-standard Diesel cycle that...
2. Analyze an Audi 3.0-liter TDI V6 Biturbo diesel engine using an air-standard Diesel cycle that addresses the "real" effects of non-isentropic compression/expansion, air-fuel ratio, fuel heating value, incomplete combustion, exhaust residual, and heat loss. The engine is four-stroke, has six cylinders with a compression ratio of 16.0, and develops maximum power at 4250 rpm. Assume the following: the diesel fuel heating value is Quv 42,600 kJ/kg, the air-to-fuel ratio (AF) at maximum power is 25, and the combustion efficiency...
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...
1. (30P) A twenty-cylinder MTU 4 STROKE 20V 4000 M93 marine diesel engine is designed to...
1. (30P) A twenty-cylinder MTU 4 STROKE 20V 4000 M93 marine diesel engine is designed to develop 3490 kW brake power at 1800 rpm. The bore is 170mm and stroke length is 210 mm for each cylinder and bsfc is 205 g/kWh. The calorific value of the petrol is 42 800kJ/kg. The inlet air manifold conditions are 80 kPa and 313 K. and The engine has a volumetric efficiency of 0.82. Calculate: a) Displacement (litre) b) Bmep (kPa) c) Fuel...
A four stroke cycle Sl engine has a cylinder condition at the start of the compression...
A four stroke cycle Sl engine has a cylinder condition at the start of the compression of 27°C and 100 kPa. The engin has a compression ratio of -3.41 And heat addition from combustion is in "2.105 kJ/kg. The Thermal efficiency of the engine is equal to Round your final answer to 1.decimal place precision A four-stroke cycle Sl engine has a cylinder condition at the start of the compression of 27°C and 100 kPa. The engine has a compression...
. A 4 stroke 4 cylinder spark ignition engine runs on a stoichiometric mixture of ethanol and air...
. A 4 stroke 4 cylinder spark ignition engine runs on a stoichiometric mixture of ethanol and air at wide open throttle. The 1 liter engine has a compression ratio of 9:1 and operates at 5000 rpm. The intake manifold conditions are standard pressure and temperature, no residual gas in engine combustion chamber. Using k-1.35 for all calculations the a. Calculate the indicated work done by the engine, in joules per cycle b. Calculate the indicated thermal efficiency c. Calculate...
A turbocharged, 6.4-liter, V8 SI engine operates on an air-standard Otto cycle at WOT with an eng...
A turbocharged, 6.4-liter, V8 SI engine operates on an air-standard Otto cycle at WOT with an engine speed of 5500 RPM. The compression ratio is Te10.4:1, and condi- tions in the cylinders at the start of compression are 65°C and 120 kPa. Crevice volume is equal to 2.8% of clearance volume and has pressure equal to cylinder pressure and temperature equal to 185°C Calculate: (a) Total engine crevice volume. [cm31 (b) Percent of fuel that is trapped in the crevice...
Air at 14.7 psia, 40 oF enters an ideal four-stroke Diesel cycle with a compression ratio...
Air at 14.7 psia, 40 oF enters an ideal four-stroke Diesel cycle with a compression ratio of 20 and a displacement of 300 in3. It runs at 2100 RPM and the maximum temperature is 3300 oF. The fuel has an energy content of 19,360 Btu/lbm. a. The power output of the engine in Hp b. The cycle thermal efficiency c. The fuel consumption rate in lbm/hr
QUESTION 3 A four-stroke cycle Sl engine has a cylinder condition at the start of the...
QUESTION 3 A four-stroke cycle Sl engine has a cylinder condition at the start of the compression of 27°C and 100 kPa. The engine has a compression ratio of 8:1 and heat addition from combustion is in-1,906 kJ/kg. The Thermal efficiency of the engine is equal to Round your final answer to 1.decimal place precision.
INTERNAL COMBUSTION ENGINES Practice Problems ME 436 A 3 cylinder, 2.7 liter SI engine operates on a 4 stroke cycle at 3300 RPM with a compression ratio of 8.6:1. At the start of the compression stroke, the temperature is 47°C and the pressure is 82kPa. Assume 3% residual gases. The mechanical efficiency is 81%, combustion efficiency is 96%, and the air-fuel ratio is 16.3, and the fuel heating value is 43,000 kJ/kg. The combustion process starts at TDC and is...
2. Analyze an Audi 3.0-liter TDI V6 Biturbo diesel engine using an air-standard Diesel cycle that addresses the "real" effects of non-isentropic compression/expansion, air-fuel ratio, fuel heating value, incomplete combustion, exhaust residual, and heat loss. The engine is four-stroke, has six cylinders with a compression ratio of 16.0, and develops maximum power at 4250 rpm. Assume the following: the diesel fuel heating value is Quv 42,600 kJ/kg, the air-to-fuel ratio (AF) at maximum power is 25, and the combustion efficiency...
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...
1. (30P) A twenty-cylinder MTU 4 STROKE 20V 4000 M93 marine diesel engine is designed to develop 3490 kW brake power at 1800 rpm. The bore is 170mm and stroke length is 210 mm for each cylinder and bsfc is 205 g/kWh. The calorific value of the petrol is 42 800kJ/kg. The inlet air manifold conditions are 80 kPa and 313 K. and The engine has a volumetric efficiency of 0.82. Calculate: a) Displacement (litre) b) Bmep (kPa) c) Fuel...
A four stroke cycle Sl engine has a cylinder condition at the start of the compression of 27°C and 100 kPa. The engin has a compression ratio of -3.41 And heat addition from combustion is in "2.105 kJ/kg. The Thermal efficiency of the engine is equal to Round your final answer to 1.decimal place precision A four-stroke cycle Sl engine has a cylinder condition at the start of the compression of 27°C and 100 kPa. The engine has a compression...
. A 4 stroke 4 cylinder spark ignition engine runs on a stoichiometric mixture of ethanol and air at wide open throttle. The 1 liter engine has a compression ratio of 9:1 and operates at 5000 rpm. The intake manifold conditions are standard pressure and temperature, no residual gas in engine combustion chamber. Using k-1.35 for all calculations the a. Calculate the indicated work done by the engine, in joules per cycle b. Calculate the indicated thermal efficiency c. Calculate...
A turbocharged, 6.4-liter, V8 SI engine operates on an air-standard Otto cycle at WOT with an engine speed of 5500 RPM. The compression ratio is Te10.4:1, and condi- tions in the cylinders at the start of compression are 65°C and 120 kPa. Crevice volume is equal to 2.8% of clearance volume and has pressure equal to cylinder pressure and temperature equal to 185°C Calculate: (a) Total engine crevice volume. [cm31 (b) Percent of fuel that is trapped in the crevice...
QUESTION 3 A four-stroke cycle Sl engine has a cylinder condition at the start of the compression of 27°C and 100 kPa. The engine has a compression ratio of 8:1 and heat addition from combustion is in-1,906 kJ/kg. The Thermal efficiency of the engine is equal to Round your final answer to 1.decimal place precision.
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