Transcription of UNIT 7 IC ENGINE TESTING IC Engine Testing - IGNOU
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UNIT 7 IC ENGINE TESTING IC Engine Testing - IGNOU
79 IC ENGINE TESTING UNIT 7 IC ENGINE TESTING Structure Introduction Objectives Performance Measurements Basic Parameters Measurement of Speed Fuel Consumption Measurement Measurement of Air Consumption Measurement of Exhaust Smoke Measurement of Exhaust Emission Measurement of Brake Power Measurement of Friction Horse Power Blowby Loss Performance of SI Engines Performance of CI Engines Summary Key Words Answers to SAQs INTRODUCTION At a design and development stage an engineer would design an ENGINE with certain aims in his mind. The aims may include the variables like indicated power, brake power, brake specific fuel consumption, exhaust emissions, cooling of ENGINE , maintenance free operation etc. The other task of the development engineer is to reduce the cost and improve power output and reliability of an ENGINE . In trying to achieve these goals he has to try various design concepts.
Specific Output Specific output of an engine is defined as the brake power (output) per unit of piston displacement and is given by, Specific output bp A L = × = Constant × bmep × rpm. . . (7.9) • The specific output consists of two elements – the bmep (force) available to work and the speed with which it is working.
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