Consider a cold air standard Otto cycle for a 4-stroke engine with four cylinders. The compression...
Consider a cold air standard Otto cycle for a 4-stroke engine with four cylinders. The compression ratio is 9. At the beginning of the compression the air in each cylinder is at 95 kPa, 5 C and occupies a volume of 555 cm^3. During the heat addition process the pressure triples. Determine the efficiency of the cycle and the net power output (per kg of air). If the engine is running at 2800 RPM determine the power output in horsepower. Ans. 0.59, 562 kJ/kg, 46.7 hp
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Consider a cold air standard Otto cycle for a 4-stroke engine
with four cylinders. The compression...
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...
6. A four-cylinder, four-stroke internal combustion engine operates at 3200 RPM. The processes within each cylinder...
6. A four-cylinder, four-stroke internal combustion engine operates at 3200 RPM. The processes within each cylinder are modeled as an air-standard Otto cycle with a pressure of 14.7 lbf/in2, a temperature of 85 °F, and a volume of 0.025 ft at the beginning of compression. The compression ratio is 12, and maximum pressure in the cycle is 1150 lbf/in.2 Determine, using a cold air-standard analysis with k 1.4, the power developed by the engine, in horsepower, and the mean effective...
A four-cylinder engine with 9.5-cm bore and an 8.75-cm stroke has 10% clearance. The engine rotates...
A four-cylinder engine with 9.5-cm bore and an 8.75-cm stroke has 10% clearance. The engine rotates at 5500 rpm. The conditions at the beginning of compression are 27°C and 98 kPa. The maximum cycle temperature is 2900°K. The engine may be assumed to operate on an air-standard Otto cycle. Draw the P-V and T-S diagram of the cycle and determine: a) Pressure and Temperature at the end of the expansion process, b) Cycle work, kJ c) Mean Effective Pressure, kPa...
A four-cylinder four-stroke engine is modelled using the air standard Otto cycle (two engine revolutions per...
A four-cylinder four-stroke engine is modelled using the air
standard Otto cycle (two engine revolutions per cycle). Given the
conditions at state 1, total volume (V1) of each cylinder,
compression ratio (r), rate of heat addition (Q), and engine speed
in RPM, determine the efficiency and other values listed below. The
gas constant for air is R=0.287 kJ/kg-K.
--Given Values--
T1 (K) = 335
P1 (kPa) = 175
V1 (cm^3) = 600
r = 11
Q (kW) = 57
Speed...
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...
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...
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...
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...
Question 2 A gasoline engine of 6 cylinders operates on the four-stroke cycle. The bore of...
Question 2 A gasoline engine of 6 cylinders operates on the four-stroke cycle. The bore of each cylinder is 80 mm and the stroke is 100 mm. The indicator diagram shows an indicated mean effective pressure of 7.3 bars. The clearance volume (Vmin) of the engine is 420 cm3 . At the speed of 4100 rpm, the fuel consumption is 19.8 kg/hr and the torque developed is 160 Nm. Calculate: A. Brake power B. The brake mean effective pressure C....
Question 6 A gasoline engine of 6 cylinders operates on the four-stroke cycle. The bore of...
Question 6 A gasoline engine of 6 cylinders operates on the four-stroke cycle. The bore of each cylinder is 80 mm and the stroke is 100 mm. The indicator diagram shows an indicated mean effective pressure of 7.3 bars. The clearance volume (Vmin) of the engine is 420 cm3. At the speed of 4100 rpm, the fuel consumption is 19.8 kg/hr and the torque developed is 160 Nm. Calculate: a. Brake power b. The brake mean effective pressure Friction losses...
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...
6. A four-cylinder, four-stroke internal combustion engine operates at 3200 RPM. The processes within each cylinder are modeled as an air-standard Otto cycle with a pressure of 14.7 lbf/in2, a temperature of 85 °F, and a volume of 0.025 ft at the beginning of compression. The compression ratio is 12, and maximum pressure in the cycle is 1150 lbf/in.2 Determine, using a cold air-standard analysis with k 1.4, the power developed by the engine, in horsepower, and the mean effective...
A four-cylinder engine with 9.5-cm bore and an 8.75-cm stroke has 10% clearance. The engine rotates at 5500 rpm. The conditions at the beginning of compression are 27°C and 98 kPa. The maximum cycle temperature is 2900°K. The engine may be assumed to operate on an air-standard Otto cycle. Draw the P-V and T-S diagram of the cycle and determine: a) Pressure and Temperature at the end of the expansion process, b) Cycle work, kJ c) Mean Effective Pressure, kPa...
A four-cylinder four-stroke engine is modelled using the air
standard Otto cycle (two engine revolutions per cycle). Given the
conditions at state 1, total volume (V1) of each cylinder,
compression ratio (r), rate of heat addition (Q), and engine speed
in RPM, determine the efficiency and other values listed below. The
gas constant for air is R=0.287 kJ/kg-K.
--Given Values--
T1 (K) = 335
P1 (kPa) = 175
V1 (cm^3) = 600
r = 11
Q (kW) = 57
Speed...
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 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...
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...
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...
Question 2 A gasoline engine of 6 cylinders operates on the four-stroke cycle. The bore of each cylinder is 80 mm and the stroke is 100 mm. The indicator diagram shows an indicated mean effective pressure of 7.3 bars. The clearance volume (Vmin) of the engine is 420 cm3 . At the speed of 4100 rpm, the fuel consumption is 19.8 kg/hr and the torque developed is 160 Nm. Calculate: A. Brake power B. The brake mean effective pressure C....
Question 6 A gasoline engine of 6 cylinders operates on the four-stroke cycle. The bore of each cylinder is 80 mm and the stroke is 100 mm. The indicator diagram shows an indicated mean effective pressure of 7.3 bars. The clearance volume (Vmin) of the engine is 420 cm3. At the speed of 4100 rpm, the fuel consumption is 19.8 kg/hr and the torque developed is 160 Nm. Calculate: a. Brake power b. The brake mean effective pressure Friction losses...
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