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 hHigher calorific value of fuel = 44 000 kJ/kg, Assume that 5% of the total heat developed in the cylinder istransmitted 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.() Calculate the thickness of piston head by strength consideration.(i) Calculate the thickness of piston head by thermal consideration.(ii) 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.

Given: D=250 mm L=300 mm N=600 rpm Pm=0.6 MPa Pmax=4 MPa efficiency=0.8 Sut=200 MPa fs=5 C=0.05…

(1) Calculate the thickness of piston head by strength consideration. (ii) Calculate the thickness of piston head by thermal consideration. (ii) 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.

(1) Calculate the thickness of piston head by strength consideration. (ii) Calculate the thickness of piston head by thermal consideration. (ii) 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.

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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