2. The following information is known for a turbocharged 4-stroke Diesel engine, when running at a...
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...
1. (30P) A twenty-cylinder MTU 4 STROKE 20V 4000 M93 marine diesel engine is designed to develop 3490 kW brake power at 1800 rpm. The bore is 170mm and stroke length is 210 mm for each cylinder and bsfc is 205 g/kWh. The calorific value of the petrol is 42 800kJ/kg. The inlet air manifold conditions are 80 kPa and 313 K. and The engine has a volumetric efficiency of 0.82. Calculate: a) Displacement (litre) b) Bmep (kPa) c) Fuel...
. 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 mechanically coupled supercharger is run by a four-stroke four –cylinder square diesel engine with a bore of 100 mm. Air enters the compressor at 27 °C and the compressor pressure ratio is 1.6. From the compressor the air is passed on to a cooler where 1200 kJ/min of heat is rejected. The air leaves the cooler at 67 oC. Some air from the compressor is bled after the cooler to supercharge the engine. The volumetric efficiency is 85 %...
An idealized diesel engine operates in a cycle known as the air-standard diesel cycle shown in the figure below. Fuel is sprayed into the cylinder at the point of maximum compression, B. Combustion occurs during the expansion B-C, which is modeled as an isobaric process. Show that the efficiency of an engine operating in this idealized diesel cycle is given by the following expression. (Submit a file with a maximum size of 1 MB.) 1/10-TA VTC e-1- Adiabatic processes V...
The following information is available for an aircraft four-stroke reciprocating engine: indicated mean effective pressure (IMEP) = 160 psi stroke = 5 in bore = 5 in engine rpm = 3000 number of cylinders = 9 cylinder clearance volume = 15 in3 engine mechanical efficiency, ηmech = 90% propeller efficiency, ηprop = 80% Calculate brake horsepower (BHP) indicated horsepower (IHP) thrust horsepower (THP) friction horsepower (FHP) brake mean effective pressure (BMEP) Compression Ratio (is your answer reasonable for a spark...
Q2: A V-10, 4-stroke diesel engine has a compression ratio of 15:1. Initial conditions are 18°C and 100 kPa. The addition is qin-1800 kJ/kg. Applying air standard assumptions, determine the following (a) draw the P-V and T-s diagrams for the Diesel cycle (labelling all relevant information) (2 pts); (b) find the pressure and temperature at each state change end point on the curve (8 pts); (c) find the heat rejected in the exhaust (gout) (1 pt) (d) find the thermal...
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...
1. A 12-cylinder, 4-stroke automobile engine is being designed. What type of cylinder arrangement would you recommend? (a) In-Line (b) V-Type (c) W-Type (d) Rotary. 2. The expression "cylinder cut-out" means : (a) Half of cylinder volumes is used. (b) Half of cylinder numbers is used. (c) Half of cylinder masses is used. (d) None of the above. 3. Adding lubrication oil to the inlet fuel- air mixture in 2-st engines will increase: (a) HC emissions. (b) CO emissions (c)...
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