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
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
icon
Related questions
Question
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 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?
(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: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 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? (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.
Expert Solution
steps

Step by step

Solved in 3 steps with 2 images

Blurred answer
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Elements Of Electromagnetics
Elements Of Electromagnetics
Mechanical Engineering
ISBN:
9780190698614
Author:
Sadiku, Matthew N. O.
Publisher:
Oxford University Press
Mechanics of Materials (10th Edition)
Mechanics of Materials (10th Edition)
Mechanical Engineering
ISBN:
9780134319650
Author:
Russell C. Hibbeler
Publisher:
PEARSON
Thermodynamics: An Engineering Approach
Thermodynamics: An Engineering Approach
Mechanical Engineering
ISBN:
9781259822674
Author:
Yunus A. Cengel Dr., Michael A. Boles
Publisher:
McGraw-Hill Education
Control Systems Engineering
Control Systems Engineering
Mechanical Engineering
ISBN:
9781118170519
Author:
Norman S. Nise
Publisher:
WILEY
Mechanics of Materials (MindTap Course List)
Mechanics of Materials (MindTap Course List)
Mechanical Engineering
ISBN:
9781337093347
Author:
Barry J. Goodno, James M. Gere
Publisher:
Cengage Learning
Engineering Mechanics: Statics
Engineering Mechanics: Statics
Mechanical Engineering
ISBN:
9781118807330
Author:
James L. Meriam, L. G. Kraige, J. N. Bolton
Publisher:
WILEY