A 2-stroke engine that works based on thediesel cycle admits air conditioning 100kPaand 280K. The compression ratio is 20:1and the fuel-air ratio is 7.5x10^-3 kg fuel/kgair. If the calorific value of the fuel is 42750KJ/kg, the displacement volume is 0.8L(with a diameter equal to 1.1 the stroke ofthe piston) The engine is 6-cylinder androtates at 3600 rpm, use air tables andtables of combustion products with 200%excess air to determine:a) The cycle in a pressure-volume diagramwith its corresponding numbering.b) The maximum temperature of the cycle,in Kc) The cutoff ratiod) The temperature of the combustiongases at the engine outlet, in Ke) The cooling water mass flow, in kg/sf) The motor power, in kWg) The mean effective pressure, in kPah) Thermal efficiency, in %

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Answered: A 2-stroke engine that works based on…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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4] A Diesel engine operates on the air-standard cycle and has a displacement of3.5 liters. The engine’s compression ratio is 19, and the cutoff ratio is 2.4. The conditionsat the beginning of compression are 37 oC, 98 kPaa, and 3.7 liters. If the engine operatesat 1500 rpm, determine a) the compression ratio; b) the cycle work; and c) the powereddeveloped.
An SI engine uses a four-stroke Otto cycle with turbocharging that is air-standard. The air-fuel mixture enters the cylinders at 70°C, with a compression ratio of rk = 8. Determine the amount of effort done during the compression stroke.
An air-standard dual cycle has a compression ratio of 8.6 and displacement of Vd = 2.2 L. At the beginning of compression, p1 = 95 kPa, and T1 = 290 K. The heat addition is 4.5 kJ, with one quarter added at constant volume and the rest added at constant pressure. T2 = 670K T3 = 1152K T4 = 2139 K T5 = 1339K FIND: b) the net work of the cycle, in kJ.c) the power developed at 3000 cycles per minute, in kW.d) the thermal efficiency.e) the mean effective pressure, in kPa.
At the beginning of the compression process of an air-standard Otto cycle, P1=1bar, T1=290K, V1=400cm3. The maximum temperature in the cycle is 2200K and the compression ratio is 8. Determine the (a) net power output, in kW, if the engine has four cylinders and the cycle is repeated 1200 times per minute in each cylinder. Also, (b) show the T-s and P-? diagrams. Note that the specific heats are NOT constant.
Q3) A constant volume fuel – air cycle with a compression ratio of 8, the A/F=15:1. The pressure before the exhaust valve open is 4.0 bar . The temperature and pressure at the beginning of compression stroke is 1 bar and 60oC . The calorific value of fuel is 44000 kJ/kg. Determine the maximum cycle temperature and pressure if the index of compression is 1.32 and the specific heat at constant volume is Cvp = 0.68+0.0003T.
1. An ideal air-standard diesel cycle with inlet conditions: 21.11˚C and 14.7 psia, 700 Btu/lbm heat input, and a compression ratio of 15. Find P2, T2, T3, V3, P4, T4, and the efficiency of the cycle. Take Note: Assume air standard values for R and k Cp = kR/k-1 Cv = R/k-1 a. Find the value of P2. (in psi or lb/in^2) b. Find the value of T2. (in Rankine) c. Find the value of T3. (in Rankine) d. Find the value of V3. (in ft^3/lbm) e. Find the value of P4. (in psi or lb/in^2) f. Find the value of T4. (in Rankine) g. Find the value of efficiency of the cycle. (ex. 100-%)
A Volkswagen Passat has a six-cylinder Otto-cycle engine with compression ratio r = 10.6. The diameter of each cylinder, called the bore of the engine, is 82.5 mm. The distance that the piston moves during the compression, called the stroke, is 86.4 mm. The initial pressure of the air-fuel mixture is 8.50 x 104 Pa, and the initial temperature is 300 K (the same as the outside air). Assume that 200 J of heat is added to each cylinder in each cycle by the burning gasoline, and that the gas has Cv = 20.5 J/mol K and y=1.40. Calculate the total work done in one cycle in each cylinder of the engine, and the heat released when the gas is cooled to the temperature of the outside air.
An air-standard Diesel cycle has a maximum temperature of 1800 K. At the beginning of compression, p1 = 95 kPa and Tq = 300 K. The mass of airis 12 g. For a compression ratio of 15, determine (a) the net work of the cycle, in kJ. (b) the thermal efficiency. (c) the mean effective pressure, in kPa.
At the beginning of the compression process in an air standard dual cycle, P1 = 1 bar and T1 = 300 K. Qin is 1000 kJ/kg.Consider compression ratio ranging from 10 to 20. Determine v1 and v2
The pressure and temperature at the beginning of compression of a cold air-standard Diesel cycle are 90 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 7.2 MPa and the temperature is 2050 K. Assume constant specific heats evaluated at 300 K.Determine:(a) the compression ratio.(b) the cutoff ratio.(c) the percent thermal efficiency of the cycle.(d) the mean effective pressure, in kPa.
At the beginning of the compression process in an air standard dual cycle, P1 = 1 bar and T1 = 300 K. Qin is 1000 kJ/kg. Consider compression ratio ranging from 10 to 20. Determine T5 and P5
The compression ratio of an air standard diesel cycle is 13 and the peak combustion temperature is 1681.55 oC. Determine the potential output power that the engine can generate if the heat rejected by the engine is 3kW. a. 3.8552kWb. 3.8553 kWc. 8.8551 kWd. 3.8850 kW

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