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T: The following data is given for a four-stroke diesel engine: Cylinder bore 250 mm Length of stroke = 300 mm Speed = 600 rpm Indicated mean effective pressure = 0.6 MPa Mechanical efficiency = 80% Maximum gas pressure 4 MPa Fuel consumption = 0.25 kg per BP per h Higher calorific value of fuel = 44 000 kJ/kg Assume that 5% of the total heat developed in the cylinder is transmitted by the piston. The piston is made of grey cast iron FG 200 (Sut 200 N/mm² and k = 46.6 W/m/°C) and the factor of safety is 5. The temperature difference between the centre and the edge of the piston head is 220°C. (i) Calculate the thickness of piston head by strength consideration. (ii) Calculate the thickness of piston head by thermal consideration. (iii) Which criterion decides the thickness of piston head?

T: The following data is given for a four-stroke diesel engine: Cylinder bore 250 mm Length of stroke = 300 mm Speed = 600 rpm Indicated mean effective pressure = 0.6 MPa Mechanical efficiency = 80% Maximum gas pressure 4 MPa Fuel consumption = 0.25 kg per BP per h Higher calorific value of fuel = 44 000 kJ/kg Assume that 5% of the total heat developed in the cylinder is transmitted by the piston. The piston is made of grey cast iron FG 200 (Sut 200 N/mm² and k = 46.6 W/m/°C) and the factor of safety is 5. The temperature difference between the centre and the edge of the piston head is 220°C. (i) Calculate the thickness of piston head by strength consideration. (ii) Calculate the thickness of piston head by thermal consideration. (iii) Which criterion decides the thickness of piston head?

Elements Of Electromagnetics
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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T: 3 four-stroke diesel engine: Cylinder bore Length of stroke Speed = 600 Indicated mean effective pressure Mechanical efficiency = 80% The following data is given for a 250 тm = 300 mm 0.6 MPa Mахimum gas pressure 4 MPa ВР рer Fuel consumption = 0.25 kg per BP per h Higher calorific value of fuel = 44 000 kJ/kg Assume that 5% of the total heat developed in the cylinder is transmitted by the piston. The piston is made of grey cast iron FG 200 (S = 200 N/mm2 and k = 46.6 W/m/C) and the factor of safety is 5. The temperature difference between the centre and the edge of the piston head is 220°C. (i) Calculate the thickness of piston head by strength consideration. (ii) Calculate the thickness of piston head by %3D thermal consideration. (iii) Which criterion decides the thickness of piston head? (iv) State whether the ribs are required. (v) If so, calculate the number and thickness of piston ribs. (vi) State whether a cup is required in the top of the piston head. (vii) If so, calculate the radius of the cup.
Transcribed Image Text:T: 3 four-stroke diesel engine: Cylinder bore Length of stroke Speed = 600 Indicated mean effective pressure Mechanical efficiency = 80% The following data is given for a 250 тm = 300 mm 0.6 MPa Mахimum gas pressure 4 MPa ВР рer Fuel consumption = 0.25 kg per BP per h Higher calorific value of fuel = 44 000 kJ/kg Assume that 5% of the total heat developed in the cylinder is transmitted by the piston. The piston is made of grey cast iron FG 200 (S = 200 N/mm2 and k = 46.6 W/m/C) and the factor of safety is 5. The temperature difference between the centre and the edge of the piston head is 220°C. (i) Calculate the thickness of piston head by strength consideration. (ii) Calculate the thickness of piston head by %3D thermal consideration. (iii) Which criterion decides the thickness of piston head? (iv) State whether the ribs are required. (v) If so, calculate the number and thickness of piston ribs. (vi) State whether a cup is required in the top of the piston head. (vii) If so, calculate the radius of the cup.
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