3. An engine of 250 mm bore and 375 mm stroke works on Otto cycle. The clearancevolume is 0.00263 m³. The initial pressure and temperature are 1 bar and 50°C. If themaximum pressure is limited to 25 bar, find the following: (i) The air standard efficiencyof the cycle and (ii) The mean effective pressure for the cycle.4. The stroke and cylinder diameter of a compression ignition engine are 250 mm and 150mm respectively. If the clearance volume is 0.0004 m³ and fuel injection takes place atconstant pressure for 5 per cent of the stroke determine the efficiency of the engine.Assume the engine working on the diesel cycle.

Answered: Image /qna-images/answer/5a568610-77f2-4b66-9bdc-ac6147c282be.jpg

Answered: 3. An engine of 250 mm bore and 375 mm…

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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The compression ratio in an air standard Otto cycle is 9. At the beginning of the compression stroke, the pressure is 0.1 MPa and the temperature is 21 C. The heat transfer to the air per cycle is 2000 kJ/kg. Use the PG model for air. I am trying to find the Mean Effective Pressure from this information
An Sl engine with a compression ratio rc = 10.1:1 operates on the air standard Otto cycle at 4500 RPM. Maximum temperature in the cycle is 2700 °K and maximum pressure is 8200 kPa. The pressure in the cylinder when the exhaust valve opens is 600 KPa and the exhaust pressure is 98 kPa. The exhaust valve effectively opens at 56° ÞBDC. Calculate: 1. Time of exhaust blowdown in sec 2. The average temperature of the exhaust during the exhaust stroke in °K 3. The maximum flow velocity through the exhaust valve at the start of the blowdown process assuming chocked flow conditions in (m/sec)
An engine operating on the Otto cycle principle has an initial compression temperature of 675°C and a compression ratio of 8. The pressure at this condition is 100 kPa and the cylinder volume is 0.028 m³. The maximum temperature that can be achieved by the system is 4500°C. a.)Calculate the temperature and pressure at each end of the process (point), B. thermal efficiency, C. MEP
A The compression ratio of a diesel cycle is 15.5, and the cutoff occurs at 10% of the stroke.14 psia and 600 K characterize state 1. Calculate the following for the hot-air standard with k= 1.34and a starting volume of 2 cu ft:a. Find T2 , P2 , V2 , T3 , V3 , P4 , and T4b. Compute the heat added (QA),heat rejected (QR), work (W) andthe cycle efficiency (e).c. for a rate of circulation of 1000 cfm,compute the horsepower.
Example 3-1: A four-cylinder, 2.5-liter, Sl automobile engine operates at WOT on a four-stroke air standard Otto cycle at 3000RPM. The engine has a compression ratio of (8.6:1), a mechanical efficiency of 90%, and a stroke to bore ratio (S/B=1.2). Fuel is isooctane with AF=14.5, a heating value of 4500 kJ/kg, and combustion efficiency ne=95%. At the start of the compression stroke, conditions in the cylinder combustion chamber are 101.325 KPA and 500C. 1.draw the cycle 2. Find Efficiency 3.performance analysis (Pressure, temperature, Qin, Qout) for all Processes
A The compression ratio of a diesel cycle is 15.5, and the cutoff occurs at 10% of the stroke. 14 psia and 600 K characterize state 1. Calculate the following for the hot-air standard with k= 1.34 and a starting volume of 2 cu ft:a. Find T2 , P2 , V2 , T3 , V3 , P4 , and T4b. Compute the heat added (QA), heat rejected (QR), work (W) and the cycle efficiency (e).c. for a rate of circulation of 1000 cfm, compute the horsepower
A The compression ratio of a diesel cycle is 15.5, and the cutoff occurs at 10% of the stroke. 14 psia and 600 K characterize state 1. Calculate the following for the hot-air standard with k= 1.34 and a starting volume of 2 cu ft: Qin a. Find T2 , P2 , V2 , T3 , V3 , P4 , and T4 3 P = P, b. Compute the heat added (QA), Wout heat rejected (Qr), work (W) and the cycle efficiency (e). P. c. for a rate of circulation of 1000 cfm, Qout compute the horsepower.
7. An OTTO cycle operates on 0.15 lb/s of air from 15 psia and 1500F at the beginning ofcompression. The temperature at end of combustion is 50000R; compression ratio is 5:5; hot airstandard, k = 1.37.1 Solve for the volume flow rate at point 17.2 Determine the pressure at point 27.3 Calculate temperature at point 2
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.

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