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1. In the compression stroke of a gas engine, the work done on the gas by...
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 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...
Consider a four-cylinder, four stroke, compression ignition engine with a compression ratio of 22 and a...
Consider a four-cylinder, four stroke, compression ignition engine with a compression ratio of 22 and a cutoff ratio of 3. (a) Name the thermodynamic cycle you would use to analyze this engine, (b) draw the P-v and Tis diagrams for this cycle, (c) determine the heat input to the engine (in kJ/kg) if the temperature rise of the heat addition step is 1500°C, and (d) determine the engine speed in revolutions/minute (RPM) for a net power output of 50 kW...
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...
During the compression stroke of a certain gasoline engine, the pressure increases from 1.00 atm to...
During the compression stroke of a certain gasoline engine, the pressure increases from 1.00 atm to 20.5 atm. The process is adiabatic and the air-fuel mixture behaves as a diatomic ideal gas. (a) By what factor does the volume change? V final initial V. (b) By what factor does the temperature change? I final Tinitial Assume the compression starts with 0.016 mole of gas at 26.0°C. (c) Find the value of Q that characterizes the process. J (d) Find the...
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 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...
Q2: A V-10, 4-stroke diesel engine has a compression ratio of 15:1. Initial conditions are 18°C...
Q2: A V-10, 4-stroke diesel engine has a compression ratio of 15:1. Initial conditions are 18°C and 100 kPa. The addition is qin-1800 kJ/kg. Applying air standard assumptions, determine the following (a) draw the P-V and T-s diagrams for the Diesel cycle (labelling all relevant information) (2 pts); (b) find the pressure and temperature at each state change end point on the curve (8 pts); (c) find the heat rejected in the exhaust (gout) (1 pt) (d) find the thermal...
1-1. List five differences between SI engines and CI engines. 1-2. A four-stroke cycle engine mayor...
1-1. List five differences between SI engines and CI engines. 1-2. A four-stroke cycle engine mayor may not have a pressure boost (supercharger, tur in the intake system. Why must a two-stroke cycle engine always have an intake 1-3. List two advantages of a two-stroke cycle engine over a four-stroke cycle engine. List two advantages of a four-stroke cycle engine over a two-stroke cycle engine. 1-4. (a) Why do most very small engines operate on a two-stroke cycle? (b) Why...
2. The following information is known for a turbocharged 4-stroke Diesel engine, when running at a...
2. The following information is known for a turbocharged 4-stroke Diesel engine, when running at a certain operating point onboard a vessel: (Geometric) compression ratio: Volumetric ratio: Combustion efficiency Heat input efficiency: Mechanical efficiency Entrapped air efficiency: Intake manifold pressure: Intake manifold temperature: v2 / v, = 20 comb = 98% = 75% m = 90% trap = 100% 3.5 bar (abs) 50°C In the above (see also the figure given at the bottom of the back page). VI: Volume...
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 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...
Consider a four-cylinder, four stroke, compression ignition engine with a compression ratio of 22 and a cutoff ratio of 3. (a) Name the thermodynamic cycle you would use to analyze this engine, (b) draw the P-v and Tis diagrams for this cycle, (c) determine the heat input to the engine (in kJ/kg) if the temperature rise of the heat addition step is 1500°C, and (d) determine the engine speed in revolutions/minute (RPM) for a net power output of 50 kW...
During the compression stroke of a certain gasoline engine, the pressure increases from 1.00 atm to 20.5 atm. The process is adiabatic and the air-fuel mixture behaves as a diatomic ideal gas. (a) By what factor does the volume change? V final initial V. (b) By what factor does the temperature change? I final Tinitial Assume the compression starts with 0.016 mole of gas at 26.0°C. (c) Find the value of Q that characterizes the process. J (d) Find the...
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...
Q2: A V-10, 4-stroke diesel engine has a compression ratio of 15:1. Initial conditions are 18°C and 100 kPa. The addition is qin-1800 kJ/kg. Applying air standard assumptions, determine the following (a) draw the P-V and T-s diagrams for the Diesel cycle (labelling all relevant information) (2 pts); (b) find the pressure and temperature at each state change end point on the curve (8 pts); (c) find the heat rejected in the exhaust (gout) (1 pt) (d) find the thermal...
1-1. List five differences between SI engines and CI engines. 1-2. A four-stroke cycle engine mayor may not have a pressure boost (supercharger, tur in the intake system. Why must a two-stroke cycle engine always have an intake 1-3. List two advantages of a two-stroke cycle engine over a four-stroke cycle engine. List two advantages of a four-stroke cycle engine over a two-stroke cycle engine. 1-4. (a) Why do most very small engines operate on a two-stroke cycle? (b) Why...
2. The following information is known for a turbocharged 4-stroke Diesel engine, when running at a certain operating point onboard a vessel: (Geometric) compression ratio: Volumetric ratio: Combustion efficiency Heat input efficiency: Mechanical efficiency Entrapped air efficiency: Intake manifold pressure: Intake manifold temperature: v2 / v, = 20 comb = 98% = 75% m = 90% trap = 100% 3.5 bar (abs) 50°C In the above (see also the figure given at the bottom of the back page). VI: Volume...
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