A spark ignition engine works with an Otto cycle that has the following characteristics: Q =...
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spark ignition engine works with an Otto cycle that has the
following characteristics:
Q =...
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...
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) What is a spark ignition engine? What is the air standard cycle of such an...
A) What is a spark ignition engine? What is the air standard cycle of such an engine? What are its four processes explain with neat sketch. b) What is a compression ignition engine? Why is the compression ratio of such an Engine more than that of SI engine? Explain with neat sketch. c) Describe the role of thermodynamics in building a sustainable society
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...
. 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 single-cylinder four-stroke-cycle spark-ignition engine has a BSFC of 0.4 kg/kW-hr and a volumetric efficiency of...
A single-cylinder four-stroke-cycle spark-ignition engine has a BSFC of 0.4 kg/kW-hr and a volumetric efficiency of 78% at a speed of 45 rps. The bore is 6 cm and the stroke is 8.5 cm. What is the fuel flow rate, fuel-air ratio, and brake torque if the brake power output is 6 kW with ambient conditions of 100 kPa and 22 C?
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...
A 4 stroke spark ignition engine gave the following results during a test. Number of cylinders...
A 4 stroke spark ignition engine gave the following results during a test. Number of cylinders 6 Bore of cylinders 90 mm Stroke 80 mm Speed 5000 rev/min Fuel consumption rate 0.3 dm/min Fuel density 750 kg/m Calorific value 44 MJ/kg Net brake load 180 N Torque arm 0.5 m Net indicated area 720 mm Base length of indicator diagram 60 mm Pressure scale 40 kPa/mm Calculate the following. The Brake Power. ii) The Mean effective Pressure. The Indicated Power....
An Otto engine is operating with natural gas which can be approximated as an ideal gas....
An Otto engine is operating with natural gas which can be approximated as an ideal gas. Assuming the engine is at standard condition (25°C, 1 atm) before the compression process. Also, temperature of the Otto cycle after the combustion process is 1500 K. (a) Assuming compression ratio of the Otto engine as 8, 9 and 10, determine the corresponding temperatures of the natural gas-air mixture (natural gas with 100% excess air) after the compression. (b) Determine the thermal energy release...
Which of the following is NOT included in the four-stroke cycle of a diesel engine? Choose...
Which of the following is NOT included in the four-stroke cycle of a diesel engine? Choose the best answer. Intake Combustion Exhaust Spark Regarding gas engine combustion, which of the following statements is FALSE? Choose the best answer. Gas engines have a lower compression ratio than diesel engines Gas engines are basically diesel engines with different injectors Gas engines use an ignition module and spark plug Natural gas requires more heat than diesel fuel to ignite
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...
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 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...
. 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 single-cylinder four-stroke-cycle spark-ignition engine has a BSFC of 0.4 kg/kW-hr and a volumetric efficiency of 78% at a speed of 45 rps. The bore is 6 cm and the stroke is 8.5 cm. What is the fuel flow rate, fuel-air ratio, and brake torque if the brake power output is 6 kW with ambient conditions of 100 kPa and 22 C?
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...
A 4 stroke spark ignition engine gave the following results during a test. Number of cylinders 6 Bore of cylinders 90 mm Stroke 80 mm Speed 5000 rev/min Fuel consumption rate 0.3 dm/min Fuel density 750 kg/m Calorific value 44 MJ/kg Net brake load 180 N Torque arm 0.5 m Net indicated area 720 mm Base length of indicator diagram 60 mm Pressure scale 40 kPa/mm Calculate the following. The Brake Power. ii) The Mean effective Pressure. The Indicated Power....
Which of the following is NOT included in the four-stroke cycle of a diesel engine? Choose the best answer. Intake Combustion Exhaust Spark Regarding gas engine combustion, which of the following statements is FALSE? Choose the best answer. Gas engines have a lower compression ratio than diesel engines Gas engines are basically diesel engines with different injectors Gas engines use an ignition module and spark plug Natural gas requires more heat than diesel fuel to ignite
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