Aims of a design engineer: Indicated power, Brake power, Specific fuel consumption, Exhaust emissions, Cooling of engine, Maintenance free operation etc., Task of development engineer: Reduce the cost, Improve the power output and Improve the reliability of the engine. 1/6/2015 2 Dr. M. Mohan Jagadeesh Kumar Testing of IC Engines
Tests carried away by a development engineer: Fuel and air measurements, Power measurements, Emission measurements, Heat balances, Injector needle lift measurements, and Swirl pattern and photographs of burning process in combustion chamber. The dependency of nature and type of test to be conducted: Degree of development of the design, The accuracy required, and Funds available. 1/6/2015 3 Dr. M. Mohan Jagadeesh Kumar Testing of IC Engines
The following objectives are set: Understand the performance parameters in evaluation of IC engine performance, Calculate speed of engine, fuel and air consumptions etc., Calculate the exhaust smoke and exhaust emission, Difference between the performance of SI engines and CI engines. 1/6/2015 4 Dr. M. Mohan Jagadeesh Kumar Testing of IC Engines
Definition: It is an indication of success of engine performs its assigned task. Performance parameters: Specific fuel consumption, Brake mean effective pressure, Specific power output, Specific weight, and Exhaust smoke and other emissions. Particular application of the engine decides the relative imp of these performance parameters. 1/6/2015 5 Dr. M. Mohan Jagadeesh Kumar Testing of IC Engines
The basic performance parameters: Power and mechanical efficiency, Mean effective pressure and torque, Specific output, Volumetric efficiency, Fuel-air ratio, Specific fuel consumption, Thermal efficiency and heat balance, Exhaust smoke and other emissions, and Specific weight. 1/6/2015 6 Dr. M. Mohan Jagadeesh Kumar Testing of IC Engines
Power and Mechanic Efficiency: Power is defined as rate of doing work.
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Thermodynamics, Internal combustion engine, Engine technology, Dr. M. Mohan Jagadeesh Kumar, Mohan Jagadeesh Kumar