Q6: An ideal Diesel engine has a diameter of (15 cm) and stroke (20 cm). Theclearance volume is (10 %) of the swept volume. Determine the compression ratioand the air standard efficiency of the engine if the cut-off takes place at (6%) of thestroke. Answers: 11,57%f=J+0.63Je

Answered: Image /qna-images/answer/67f1d5b8-5ba1-4a47-8f27-c7b4f8f147de.jpg

Answered: Q6: An ideal Diesel engine has a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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Problem 1.1MA

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1.2 Estimate the loss in air standard efficiency for the diesel engine for the compression ratio 14 and the cut-off changes from 6% to 13% of the stroke. 1.3 The compression ratio of an air standard dual cycle is 12 and the maximum pressure on the cycle is limited to 70bar. The pressure and temperature of the cycle at the beginning of compression process are 1bar and 300K. Calculate the thermal efficiency and Mean Effective Pressure. Assume cylinder bore = 250mm, Stroke length = 300mm, Cp=1.005K J/Kg K, Cv=0.718KJ/Kg K. %3D
13. The pressures on the compression curve of a diesel engine are at th stroke 1.4 bar and at th stroke 14 bar. Estimate the compression ratio. Calculate the air standard efficiency of the engine if the cut-off occurs at tth of the stroke. (Ans. 18.54 ; 63.7%)
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The swept volume of an engine working on the dual combustion cycle is 0.1068m³. The clearance volume is 8% of the swept volume. At the beginning of compression the air conditions are 100kPa and 42°C The maximum cycle conditions are 4500kPa and 1500°C. Calculate: (a). thermal efficiency (b). mean effective pressure (c). exhaust pressure (d). air-fuel ratio if the calorific value of the fuel is 43MJ/kg Assume the compression and expansion to be adiabatic. Use the standard constants for air.
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.
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John’s automobile has a three-liter SI-V6 engine that operates on a four-stroke cycle at 3600 RPM. The compression ratio is 9.5, the length of connecting rods is 16.6 cm, and the engine is square (B=S). at this speed, combustion ends at 20o at T.D.C. This engine is connected to Dynamometer which gives a brake output torque reading of 205 N-m. At his speed, air enters the cylinders at 85 kPa and 60o C, and the mechanical efficiency of the engine is 85%. Calculate: (a) Brake power, HP || (b) Indicated Power, HP || (c) Brake Mean Effective Pressure, Bmep , Psia || (d) Indicated Mean Effective Pressure, Imep, Psia || (e) Friction Mean Effective Pressure, Fmep, Psia
A Diesel engine has a compression ratio of 20 and cut-off takes place at 5% of the stroke. Find the air-standard efficiency. Assume y = 1.4.
A compression-ignition engine with compression ratio of 14 is being designed. Pressureand temperature at the bottom dead centre are 1.3 bar and 400K. The engine operatesaccording to the standard Diesel cycle. Assume polytrophic index to be 1.33. Computepressure and temperature at the top dead centre
(b) The pressure, volume and temperature at the beginning of compression of a four stroke petrol engine are 105kN/m²,0.0005m³ and 25°C respectively. The maximum temperature of the cycle is 1400°C. The volume ratio of the engine is 8:1. i) Calculate the mean effective pressure in the cylinder.
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Q6: An ideal Diesel engine has a diameter of (15 cm) and stroke (20 cm). The clearance volume is (10 %) of the swept volume. Determine the compression ratio and the air standard efficiency of the engine if the cut-off takes place at (6%) of the stroke. Answers: 11,57% f= J+0.63 Je