8/1/2023 0 Comments Find workdone in ic engine![]() ![]() During the heat rejection, the air is maintained at constant volume and due to heat rejection, entropy decreases, pressure and temperature also decrease to initial state. Process 4-1: Constant Volume Heat Rejection Qs = Cv(T3-T2) Process 3-4: Reversible Adiabatic Expansion or Isentropic Expansion:Īir expands adiabatically causing the work-energy to be transferred to the surroundings at the expense of internal energy of the air.Įntropy remains constant as there is no heat transfer but the Pressure, Temperature and Volume decreases from stage 3 to 4. Due to heat supply(addition), there is an increase in entropy. Thus the work done is zero but the pressure and temperature of the air increase further to the maximum value attained in the cycle. ![]() Heat is supplied to air from hot body while the volume of the air remains constant. Process 2-3: Constant Volume heat supply (or) Heat Addition: But, entropy remains constant as there is no heat transfer across the cylinder walls. The air is compressed into the clearance volume of the cylinder and thus raising the pressure and temperature of the air. ![]() Process 1-2: Reversible Adiabatic Compression or Isentropic Compression: The explanation of above processes are as follows. Process 4-1: Constant Volume Heat Rejection.Process 3-4: Reversible Adiabatic Expansion or Isentropic Expansion.Process 2-3: Constant Volume heat supply.Process 1-2: Reversible Adiabatic Compression or Isentropic Compression.The Otto cycle consists of 4 processes and are as follows. Otto Cycle is a constant volume cycle on which petrol and gas engines work. The cycle of operation for the four-stroke engine consists of Explanation of Four Strokes Occured in Petrol Engine: In a four-stroke engine, the cycle of operation is completed in four strokes of the piston or two revolutions of the crankshaft.ĭuring the 4 strokes of the piston, there are five events to be completed and they are Suction, compression, combustion, expansion, and exhaust.Įach stroke consists of 180 degrees of Crankshaft rotation and hence a four-stroke cycle is completed through 720 degrees of crankshaft rotation. SI engines are used in passenger cars, motorcycles, aircraft, agricultural equipment, etc. So before dive into the otto cycle, I would love to discuss on the SI Engine, it will help you to understand the topic more easily. When we divide the work output by heat input swe get the value of efficiency. The difference between the two will give us the net work output. So the net work can be found simply by subtracting Heat input and heat output. Hello readers, in this article I will discuss on Otto Cycle, after reading this article, we will understand the concept of Otto Cycle, it's processes, Pressure-Volume Diagram, Efficiency, and lastly the applications of this cycle. The work done is defined as the net useful heat taken from the heat input. ![]()
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