Diesel Cycle

 Diesel Cycle

 The Diesel cycle is a combustion process of a reciprocating internal combustion engine. In it, fuel is ignited by heat generated during the compression of air in the combustion chamber, into which fuel is then injected. Diesel Cycle PV and TS Diagram: Now we will study PV and TS Diagram:  Process 1-2: Reversible Adiabatic Compression Process  Process 2-3: Constant Pressure Heat addition  Process 3-4: Reversible Adiabatic Expansion Process  Process 4-1: Constant volume Heat rejection Process 1-2: Reversible Adiabatic Compression Process: The cylinder contains full of air which is entered through the inlet port as we studied above. Here P1, V1, and T1 are the corresponding Pressure, Volume, and Temperature. After the adiabatic compression process in which entropy remains constant and the air is compressed by the piston. The P2, V2, and T2 are corresponding Pressure, Volume, and Temperature after the compression process. Process 2-3: Constant Pressure Heat addition: Now the heat is added at a constant pressure of the system. So only temperature increases from T2 to T3 and pressure remains constant P2=P3. And the volume varies v2 to v3. Heat Addition formula is, Qadd = mCp(T3-T2) Process 3-4: Reversible Adiabatic Expansion Process: Here in this process the fuel get expanded that means the work is being out and temperature is decreasing from point 3 to point 4. Entropy remians constant. At point 3 there is maximum temperature and the temperature is decreasing to point 4. Process 4-1: Constant volume Heat Rejection Process: Here the heat is being rejected at a constant volume process that means the pressure is decreasing P4 to P1 but volume remains constant V1=V4. Heat rejected formula is, Qrej = mCv(T4-T1) Diesel Cycle Derivation: We can calculate efficiency of diesel cycle from the derivation. So lets start, So here we find out the efficiency of diesel engine. Diesel Cycle Efficiency: The efficiency of the diesel cycle is more efficient than the Otto cycle but not more than the Carnot cycle which is having 75 Percent. The diesel cycle efficiency can be calculated from the formulas which are, (Net Work)/ (Heat supplied). Diesel cycle Application:  Diesel Cycle is used in two-stroke and four-stroke diesel engine. The diesel cycle produces more amount of power compared with less fuel to the Otto cycle.  The diesel engine is used in heavy vehicles like Car, Trucks, Generator, and Buses extra.  The fuel system is larger here but where in Otto cycle has smaller.  Diesel Engine has the lowest Specific fuel consumption.

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