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operates with a 11:1 compression be Mercedes-AMG GTR is powered by a Vs-biturbo spark Tating whopping...
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...
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...
. 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...
An aircraft engine operates on a simple ideal Brayton cycle with a pressure ratio rp of...
An aircraft engine operates on a simple ideal Brayton cycle with
a pressure ratio rp of 9. Heat is added to the cycle at a rate of
490 kW; air passes through the engine at a rate of 1.1 kg/s; and
the air at the beginning of the compression is at P1 = 71 kPa and
T1 = 0 oC. Use constant specific heats at room temperature. The
properties of air at room temperature are cp =1.005 kJ/kg.K and k...
15. An air-standard, ideal gas cycle with limited-pressure combustion is used to evaluate an idea...
15. An air-standard, ideal gas cycle with limited-pressure combustion is used to evaluate an ideal compression ignition engine. The compression ratio is 12. The maximum temperature in the cycle is 2040 °F. The minimum temperature and pressure in the cycle is 40 OF and 20 psia, respectively. The coefficient β=1.2 (β is the ratio of the volume after to the volume before the constant pressure heat input process). Calculate the heat added during combustion per lbm of air, and the...
A gasoline engine operates on the air standard Otto cycle. The air intake to the engine...
A gasoline engine operates on the air standard Otto cycle. The air intake to the engine is at 300K and 95kPa (State 1). The air is compressed in the engine to an unknown pressure. Heat is then added during combustion at an amount of 1100 kJ/kg. At the end of the heat addition process, the temperature reaches 2200K. Compute the following: (a) the temperature at the end of the compression process, (b) the volumetric compression ratio of this engine, (c)...
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 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.
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...
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...
. 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...
An aircraft engine operates on a simple ideal Brayton cycle with
a pressure ratio rp of 9. Heat is added to the cycle at a rate of
490 kW; air passes through the engine at a rate of 1.1 kg/s; and
the air at the beginning of the compression is at P1 = 71 kPa and
T1 = 0 oC. Use constant specific heats at room temperature. The
properties of air at room temperature are cp =1.005 kJ/kg.K and k...
15. An air-standard, ideal gas cycle with limited-pressure combustion is used to evaluate an ideal compression ignition engine. The compression ratio is 12. The maximum temperature in the cycle is 2040 °F. The minimum temperature and pressure in the cycle is 40 OF and 20 psia, respectively. The coefficient β=1.2 (β is the ratio of the volume after to the volume before the constant pressure heat input process). Calculate the heat added during combustion per lbm of air, and the...
A gasoline engine operates on the air standard Otto cycle. The air intake to the engine is at 300K and 95kPa (State 1). The air is compressed in the engine to an unknown pressure. Heat is then added during combustion at an amount of 1100 kJ/kg. At the end of the heat addition process, the temperature reaches 2200K. Compute the following: (a) the temperature at the end of the compression process, (b) the volumetric compression ratio of this engine, (c)...
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...
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