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Ignition power stroke adiabatic expansion compression stroke adiabatic compression Pressure 4. (25 pts) in an internal...
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...
An ideal gas undergoes a cycle consisting of the following mechanically reversible steps: An adiabatic compression...
An ideal gas undergoes a cycle consisting of the following mechanically reversible steps: An adiabatic compression from Pu V1, T1 to P2, V2, T2 An isobaric expansion from P2, V2, T2 to P3 P2, Vs, T3 - An adiabatic expansion from P3, Vs, Ts to Pa, V4, T4 - A constant-volume process from Pa, V4, T4 to Pi, VV4, T1 (a) Sketch this cycle on a PV diagram (b) Derive an equation that expresses the thermal efficiency (n) of this...
Consider the following figure Otto cycle Heating at constant volume (fuel combustion) Он 3) Adiab...
Consider the following figure Otto cycle Heating at constant volume (fuel combustion) Он 3) Adiabatic expansion power stroke ed 0 rV Adiabatic compression (compression stroke) Cooling at constant volume (cooling of exhaust gases) (a) For the Otto cycle shown in the figure above, calculate the changes in entropy of the gas in each of the constant-volume processes b 无, and Td and the number of moles n and the heat capacity Cv of the gas. (Use any variable or symbol...
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 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...
Problem B: Diesel Cyele The Diesel cycle represents the ideal cycle for Compression-Ignition engines. The ideal...
Problem B: Diesel Cyele The Diesel cycle represents the ideal cycle for Compression-Ignition engines. The ideal Diesel cycle is described by the four-step cycle (process): 1-2: Isentropic Compression from Bottom-Dead-Center (BDC) to Top-Dead-Center (TDC), 2-3: Constant pressure heat addition (n) to 3-+4: Isentropic Expansion from vy to V 4+1: Constant volume heat rejection (Qout) at TDC (). (a) Sketch the P vs. v diagram for the Diesel cycle (label all key parameters and processes). [7 pts] (b) Sketch the T...
consider a four-cylinder, four-stroke, compression ignition engine with a compression ratio of 20 and a cutoff...
consider a four-cylinder, four-stroke, compression ignition engine with a compression ratio of 20 and a cutoff ratio of 4. A). name the thermodynamic cycle you would use to analyze this engine, b). p-v and t-s diagram for this cycle, c). determine the heat input to the engine if the temperature rise of the heat addition step is 1300 C, and d). determine the engine speed in revolutions/minute for a net power output of 40 kW is the net cycle work...
12. The Otto cycle is the cycle run by most car engines. An idealized Otto cycle...
12. The Otto cycle is the cycle run by most car engines. An idealized Otto cycle is depicte in this graph: lgution Power stroke oH 2 IsochoricAdiabatic expansion Adiabatic compressionValve exhaust ecl Compression stroke Exhaust stroke 1 Isochoric Intake stroke The efficiency of this idcal Otto cycle can be expressed as Ts -Ti eo = 1-14-71 where these are the temperatures of the corresponding points on the graph. a) Find the efficiency of an ideal Otto cycle with temperatures T1-25...
Problem 1 (100 pts): You are investigating the performance of a spark-ignition engine to be opera...
Problem 1 (100 pts): You are investigating the performance of a spark-ignition engine to be operated with a new gasoline fuel blend with a substantially higher auto-ignition temperature than traditional fuel, which allows for compression ratios up to 20. In this first-cut analysis, you are required to estimate the efficiency of the SI cycle for compression ratios between 5 and 20 based on the ideal Otto cycle, with one exception: you need to account for frictional loss during the compression...
A 4-stroke 3 litre V6 spark ignition petrol engine has a maximum power output of 100kW...
A 4-stroke 3 litre V6 spark ignition petrol engine has a maximum power output of 100kW at 5500rev/min, and a maximum torque of 236Nm at 3000rev/min. The minimum sfc is 0.090 kg/MJ at 3000 rpm, and the air flow rate is 0.068m²/s. The compression ratio is 8.9:1 and the mechanical efficiency is 90%. The engine was tested under ambient conditions of 20°C and 1 bar. Take the calorific value of fuel to be 44MJ/kg. (a) Determine the power output at...
An ideal gas undergoes a cycle consisting of the following mechanically reversible steps: An adiabatic compression from Pu V1, T1 to P2, V2, T2 An isobaric expansion from P2, V2, T2 to P3 P2, Vs, T3 - An adiabatic expansion from P3, Vs, Ts to Pa, V4, T4 - A constant-volume process from Pa, V4, T4 to Pi, VV4, T1 (a) Sketch this cycle on a PV diagram (b) Derive an equation that expresses the thermal efficiency (n) of this...
Consider the following figure Otto cycle Heating at constant volume (fuel combustion) Он 3) Adiabatic expansion power stroke ed 0 rV Adiabatic compression (compression stroke) Cooling at constant volume (cooling of exhaust gases) (a) For the Otto cycle shown in the figure above, calculate the changes in entropy of the gas in each of the constant-volume processes b 无, and Td and the number of moles n and the heat capacity Cv of the gas. (Use any variable or symbol...
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 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...
Problem B: Diesel Cyele The Diesel cycle represents the ideal cycle for Compression-Ignition engines. The ideal Diesel cycle is described by the four-step cycle (process): 1-2: Isentropic Compression from Bottom-Dead-Center (BDC) to Top-Dead-Center (TDC), 2-3: Constant pressure heat addition (n) to 3-+4: Isentropic Expansion from vy to V 4+1: Constant volume heat rejection (Qout) at TDC (). (a) Sketch the P vs. v diagram for the Diesel cycle (label all key parameters and processes). [7 pts] (b) Sketch the T...
12. The Otto cycle is the cycle run by most car engines. An idealized Otto cycle is depicte in this graph: lgution Power stroke oH 2 IsochoricAdiabatic expansion Adiabatic compressionValve exhaust ecl Compression stroke Exhaust stroke 1 Isochoric Intake stroke The efficiency of this idcal Otto cycle can be expressed as Ts -Ti eo = 1-14-71 where these are the temperatures of the corresponding points on the graph. a) Find the efficiency of an ideal Otto cycle with temperatures T1-25...
Problem 1 (100 pts): You are investigating the performance of a spark-ignition engine to be operated with a new gasoline fuel blend with a substantially higher auto-ignition temperature than traditional fuel, which allows for compression ratios up to 20. In this first-cut analysis, you are required to estimate the efficiency of the SI cycle for compression ratios between 5 and 20 based on the ideal Otto cycle, with one exception: you need to account for frictional loss during the compression...
A 4-stroke 3 litre V6 spark ignition petrol engine has a maximum power output of 100kW at 5500rev/min, and a maximum torque of 236Nm at 3000rev/min. The minimum sfc is 0.090 kg/MJ at 3000 rpm, and the air flow rate is 0.068m²/s. The compression ratio is 8.9:1 and the mechanical efficiency is 90%. The engine was tested under ambient conditions of 20°C and 1 bar. Take the calorific value of fuel to be 44MJ/kg. (a) Determine the power output at...
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