విద్యా దదాతి వినయం

UNIT-3 Combustion in S.I. Engines : Normal Combustion and abnormal combustion – Importance of flame speed and  effect of engine variables – Types of Abnormal combustion, pre-ignition and knocking (explanation of ) – Fuel  requirements and fuel rating, anti knock additives – combustion chamber – requirements, types. Combustion in C.I. Engines : Four stages of combustion – Delay period and its importance – Effect of engine  variables – Diesel Knock– Need for air movement, suction, compression and combustion induced turbulence –  open and divided combustion chambers and nozzles used – fuel requirements and fuel rating. Introduction : Combustion may be defined as a relatively rapid chemical combination of hydrogen and carbon in fuel with oxygen in air resulting in liberation of energy in the form of heat. Following conditions are necessary for combustion to take place:  1. The presence of combustible mixture  2. Some means to initiate m...