Se prod thermo_assignment_ic_engines

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Se prod thermo_assignment_ic_engines

  1. 1. S.Y. B. Tech. ( Production ) Applied Thermodynamics and Heat Engines Assignment – 5 Internal Combustion Engines1. Plot the Otto and Diesel cycles on P-V and T-s charts. Derive the equations for the thermal efficiency of both the cycles. Hence show, why the efficiency of Otto cycle is more than that of the Diesel cycle, for the given compression ratio.2. Explain the Valve Timing Diagram for four – stroke as well as two – stroke engines.3. Compare the S.I. Engines with C.I. Engines.4. A four – cylinder four – stroke cycle spark ignition engine develops a maximum brake torque of 160 N-m at 3000 RPM. Calculate the engine displacement, bore and stroke. The brake mean effective pressure at the maximum torque point is 960 kPa. Assume bore is equal to stroke. ( Solved example from Rajput, 6 ed., Example 23.8, pg 1113 )5. A four – cylinder two – stroke cycle petrol engine develops 30 kW ant 2500 RPM. The mean effective pressure on each piston is 8 bar and mechanical efficiency is 80 %. Calculate the diameter and stroke of each cylinder for the stroke : bore ratio of 1.5. Also calculate the fuel consumption of the engine, if the brake thermal efficiency is 28 %. The calorific value of the fuel is 43,900 kJ / kg. ( Solved example from Rajput, 6 ed., Example 23.22, pg 1123 )

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