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a) A spark-ignition engine runs on hydrogen. Assume that the exhaust consists only of water vapour...
Consider a mixture of ethanol (CH3OH) with gasoline for use as a spark-ignition engine fuel. Assume...
Consider a mixture of ethanol (CH3OH) with gasoline for use as a spark-ignition engine fuel. Assume that the mixture contains 40 % ethanol by volume, whereas gasoline has a molecular weight of 105 kg/kmol and contains 86 % carbon and 14 % hydrogen on a mass basis. Calculate the stoichiometric air/fuel ratio on a mass basis for this fuel mixture.
. 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?
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...
Question 1 25 Marks A fuel consisting of carbon, hydrogen, sulphur, oxygen and non-combustible is burnt...
Question 1 25 Marks A fuel consisting of carbon, hydrogen, sulphur, oxygen and non-combustible is burnt under excess air conditions. A bomb calorimeter test gives the fuel energy content of 38.5 MJ/kg and after combustion the mass of ash is 5% of the original mass of fuel burnt. The percentage analysis of the exhaust gas yields (by basis) mass CO2 H20 N2 SO2 14.2% 15% 69.5% 0.3% O2 1% For this combustion calculation, assume 23% O2 and 77% N2 in...
Consider the effects of exhaust gas recirculation on the combustion process. Mixing exhaust gas with the...
Consider the effects of exhaust gas recirculation on the combustion process. Mixing exhaust gas with the fuel-air gas changes the initial temperature, density, molecular weight and effective heat of combustion of the charge within an SI engine. Consider an SI engine with compression ratio 9 which uses fuel-air mixture of the equivalence ratio 1.1. The fuel-air mixture enters the intake manifold at a pressure p1 and temperature 290K. Perform an analysis of the effect of EGR on an ideal cycle....
A2. Ethylene vapour C2H4 at 27°C is burned in a combustion chamber with 15% excess air, which is also supplied at 27 °C. The temperature and pressure of the products of combustion are 640 °C and 1.1...
A2. Ethylene vapour C2H4 at 27°C is burned in a combustion chamber with 15% excess air, which is also supplied at 27 °C. The temperature and pressure of the products of combustion are 640 °C and 1.1 bar respectively. The heat released in the combustion chamber is used to heat oil. The combustion chamber is well insulated (a) Obtain the stoichiometric and the actual chemical equation for this process [1596] [1096] (b) The air fuel ratio by mass for the...
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...
Q23. Write the equation giving the force required on a fluid control volume to bring about...
Q23. Write the equation giving the force required on a fluid control volume to bring about a change in momentum and indicate three types of forces which cause a change in momentum. (a) 4 marks] (b) A jet of water 30 mm in diameter and with speed 12 m/s strikes a plate which is moving at 3 m/s in the opposite direction to the jet. The plate is inclined at 25° to the jet. (i) Assuming there is no friction...
Question 3 - 70 Marks In this question we are considering a scramjet engine. A scramjet...
Question 3 - 70 Marks In this question we are considering a scramjet engine. A scramjet engine is a high-speed propulsion engine which begins working at approximately Mach 5. Similar to a regular jet engine, the air is compressed in the inlet, fuel is added and combustion occurs in the combustion chamber and the higher pressure and temperature mixture is then exhausted through a nozzle to provide thrust. Unlike a conventional jet engine the air is compressed using the shock...
Consider a mixture of ethanol (CH3OH) with gasoline for use as a spark-ignition engine fuel. Assume that the mixture contains 40 % ethanol by volume, whereas gasoline has a molecular weight of 105 kg/kmol and contains 86 % carbon and 14 % hydrogen on a mass basis. Calculate the stoichiometric air/fuel ratio on a mass basis for this fuel mixture.
. 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?
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...
Question 1 25 Marks A fuel consisting of carbon, hydrogen, sulphur, oxygen and non-combustible is burnt under excess air conditions. A bomb calorimeter test gives the fuel energy content of 38.5 MJ/kg and after combustion the mass of ash is 5% of the original mass of fuel burnt. The percentage analysis of the exhaust gas yields (by basis) mass CO2 H20 N2 SO2 14.2% 15% 69.5% 0.3% O2 1% For this combustion calculation, assume 23% O2 and 77% N2 in...
A2. Ethylene vapour C2H4 at 27°C is burned in a combustion chamber with 15% excess air, which is also supplied at 27 °C. The temperature and pressure of the products of combustion are 640 °C and 1.1 bar respectively. The heat released in the combustion chamber is used to heat oil. The combustion chamber is well insulated (a) Obtain the stoichiometric and the actual chemical equation for this process [1596] [1096] (b) The air fuel ratio by mass for 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...
Q23. Write the equation giving the force required on a fluid control volume to bring about a change in momentum and indicate three types of forces which cause a change in momentum. (a) 4 marks] (b) A jet of water 30 mm in diameter and with speed 12 m/s strikes a plate which is moving at 3 m/s in the opposite direction to the jet. The plate is inclined at 25° to the jet. (i) Assuming there is no friction...
Question 3 - 70 Marks In this question we are considering a scramjet engine. A scramjet engine is a high-speed propulsion engine which begins working at approximately Mach 5. Similar to a regular jet engine, the air is compressed in the inlet, fuel is added and combustion occurs in the combustion chamber and the higher pressure and temperature mixture is then exhausted through a nozzle to provide thrust. Unlike a conventional jet engine the air is compressed using the shock...
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