Calculate the dimensions of a four stroke Internal Combustion engine cylinder
作者：SARAVANAN B
1. Calculate the wall thickness of IC engine cylinder for the selected material to match the desired performance parameters and the material stress
1.1. 𝜎_𝑐=(𝐷. 𝑝_𝑚𝑎𝑥)/(2(𝑡)) …N/mm^2
1.2. 𝜎_𝑙=(𝑝_𝑚𝑎𝑥.𝐷^2)/((𝐷_𝑜^2−𝐷^2 ) ) …N/mm2
1.3. Net Stresses: (𝜎_𝑐 )_𝑛𝑒𝑡=𝜎_𝑐 − 𝜇.𝜎_𝑙 …N/mm2 (𝜎_𝑙 )_𝑛𝑒𝑡=𝜎_𝑙 − 𝜇.𝜎_𝑐 …N/mm2 μ – Poisson’s ratio
1.4. 𝑡=(𝐷. 𝑝_𝑚𝑎𝑥)/(2(𝜎_𝑐))+𝐶 …mm
2. To assess the calculated dimensions of the IC engine cylinder wall for the mentioned performance parameters and material stress.
2.1. 𝑡=[(0.0045)(𝐷)]+1.6 …mm
2.2. (0.03)(𝐷)≤𝑇ℎ𝑖𝑐𝑘𝑛𝑒𝑠𝑠 𝑜𝑓 𝑑𝑟𝑦 𝑙𝑖𝑛𝑒𝑟 ≤(0.035)(𝐷) …mm
2.3. 𝑇ℎ𝑖𝑐𝑘𝑛𝑒𝑠𝑠 𝑜𝑓 𝑤𝑎𝑡𝑒𝑟 𝑗𝑎𝑐𝑘𝑒𝑡 𝑤𝑎𝑙𝑙 = (1/3 𝑡)≤(3/4 𝑡) @ [(0.032)(𝐷)]+1.6) …mm
2.4. Water space between outer cylinder wall and inner jacket wall = 9 mm for 75 mm cylinder bore @ 75 mm for 750 mm cylinder bore @ [(0.08)(D)] + 6.5 𝑚𝑚
2.5. 𝑇ℎ𝑖𝑐𝑘𝑛𝑒𝑠𝑠 𝑜𝑓 𝑤𝑎𝑡𝑒𝑟 𝑗𝑎𝑐𝑘𝑒𝑡 𝑤𝑎𝑙𝑙 =[1.2(𝑡)]≤[1.4(𝑡)] @ [(1.25)(𝑑)]≤[(1.5)(𝑑)] …mm
3. Relate the performance parameters and the type of stresses acting on IC engine cylinder which is to be designed
3.1. Performance Parameters
3.1.1. Brake Power
3.1.2. Mechanical Efficiency
3.1.3. Engine Torque
3.1.4. Indicated mean effective pressure
3.1.4.1. Maximum gas pressure
3.1.5. Engine speed
3.1.5.1. Number of working strokes per minute
3.1.6. Indicated Power
3.2. Types of stresses
3.2.1. Circumferential hoop stress
3.2.2. Longitudinal stress