A fuel-air mixture with a fuel-to-air equivalence ratio of 0.6 enters an engine cylinder at 400...
A fuel-air mixture with a fuel-to-air equivalence ratio of 0.6 enters an engine cylinder at 400 K where it is then compressed. After compression the mixture is at 750 K. Calculate the power needed for this compression process if the air mass flow rate is 100 kg/hr. Also calculate the compression ratio for this process.
Textbook : John B. Heywood - Internal Combustion Engine Fundamentals 2nd Edition
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A fuel-air mixture with a fuel-to-air equivalence ratio of 0.6
enters an engine cylinder at 400...
Cetane (C16H34) at 25 C is burned with air. The air temperature is 400 C. The...
Cetane (C16H34) at 25 C is burned with air. The air temperature is 400 C. The fuel-to-air equivalence ratio is f=0.50. Calculate the adiabatic flame temperature. Textbook : John B. Heywood - Internal Combustion Engine Fundamentals 2nd Edition
A compression ignition engine is being analyzed. The residual gas fraction is xr=0.02. The fuel-to-air equivalence ratio is...
A compression ignition engine is being analyzed. The residual gas fraction is xr=0.02. The fuel-to-air equivalence ratio is f=0.6. At the end of the compression stroke the temperature is T2=1300 K and specific volume is v2=0.19 m3/kg-air. The maximum cycle pressure is P3=4000 kPa. At the end of the power stroke the specific volume is 1.00 m3/kg-air. Calculate the temperature at the end of the combustion process, T3b, and calculate the work done [kJ/kg-air] during the power stroke.
Problem 1 (65 pts): The cylinder of a Diesel engine is initially filled with air at 100 kPa and 2...
Problem 1 (65 pts): The cylinder of a Diesel engine is initially filled with air at 100 kPa and 298 K (piston is at BDC). The air is then compressed isentropically with a compression ratio of 20. Fuel, n-dodecane, is then introduced and combusted with the air, which produces work output (i.e. pushes the piston back to BDC). At the end of the power stroke, the temperature of the combustion products is 1020 K. The amount of heat lost to...
. 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) Calculate the net work output per kmol fuel. In your analysis, assume that the fuel is introdu...
A) Calculate the net work output per kmol fuel. In your
analysis, assume that the fuel is introduced as a gas at 298K.
Now consider an Ideal Diesel Cycle that has the same compression
ratio and produces the same net work output as in Problem 1. If the
cycle has a cut-off ratio of 2:
B) Calculate the required heat input per unit mass of air.
C) Find the temperature at each state of the cycle.
Problem 1 (65 pts):...
3. A rich fuel-air ratio of propane in burned in an internal combustion engine. The analysis...
3. A rich fuel-air ratio of propane in burned in an internal combustion engine. The analysis exhaust gas by the exhaust analyzer shows that CO2 = 17%, C3H8=0.5%, with the rest being N2 and some traces of H20. For this case Calculate: a) Write the balanced chemical equation for propane b) Compute air-fuel ratio and equivalence ratio when the ideal AFR is 14.8 ran
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...
4. Air enters the intake manifold at 25°C and 100 kPa on an SI engine utilizing...
4. Air enters the intake manifold at 25°C and 100 kPa on an SI engine utilizing throttle body injection. Liquid methanol, CH40, is injected into the intake manifold at an equivalence ratio of 1.1. Assume all the fuel evaporates in the manifold before entering the cylinder. The temperature of the mixture at the entrance to the cylinder is 5°C. a) Calculate how much heat transfer, per kg of air (i.e. kJ/kg air) must be entering the intake manifold. In your...
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...
The answer is: 26.3% and 56.48 hp. Problem 12: An actual four-stroke SI engine has a...
The answer is: 26.3% and 56.48 hp.
Problem 12: An actual four-stroke SI engine has a total cylinder volume of 0.0015 m3 and a compression ratio of 9:1. The engine runs at 3000 rpm. At the start of the compression stroke the air is at 303 K and a pressure of 100 kPa. The ratio of the actual thermal efficiency of the engine to the air-standard cycle efficiency is 45%. The air to fuel ratio is 13:1. The internal energy...
Problem 1 (65 pts): The cylinder of a Diesel engine is initially filled with air at 100 kPa and 298 K (piston is at BDC). The air is then compressed isentropically with a compression ratio of 20. Fuel, n-dodecane, is then introduced and combusted with the air, which produces work output (i.e. pushes the piston back to BDC). At the end of the power stroke, the temperature of the combustion products is 1020 K. The amount of heat lost to...
. 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) Calculate the net work output per kmol fuel. In your
analysis, assume that the fuel is introduced as a gas at 298K.
Now consider an Ideal Diesel Cycle that has the same compression
ratio and produces the same net work output as in Problem 1. If the
cycle has a cut-off ratio of 2:
B) Calculate the required heat input per unit mass of air.
C) Find the temperature at each state of the cycle.
Problem 1 (65 pts):...
3. A rich fuel-air ratio of propane in burned in an internal combustion engine. The analysis exhaust gas by the exhaust analyzer shows that CO2 = 17%, C3H8=0.5%, with the rest being N2 and some traces of H20. For this case Calculate: a) Write the balanced chemical equation for propane b) Compute air-fuel ratio and equivalence ratio when the ideal AFR is 14.8 ran
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...
4. Air enters the intake manifold at 25°C and 100 kPa on an SI engine utilizing throttle body injection. Liquid methanol, CH40, is injected into the intake manifold at an equivalence ratio of 1.1. Assume all the fuel evaporates in the manifold before entering the cylinder. The temperature of the mixture at the entrance to the cylinder is 5°C. a) Calculate how much heat transfer, per kg of air (i.e. kJ/kg air) must be entering the intake manifold. In your...
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...
The answer is: 26.3% and 56.48 hp.
Problem 12: An actual four-stroke SI engine has a total cylinder volume of 0.0015 m3 and a compression ratio of 9:1. The engine runs at 3000 rpm. At the start of the compression stroke the air is at 303 K and a pressure of 100 kPa. The ratio of the actual thermal efficiency of the engine to the air-standard cycle efficiency is 45%. The air to fuel ratio is 13:1. The internal energy...
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