It is the zig-zag motion of the air-fuel mixture in the combustion chamber. The turbulence of the mixture is due to admission of fuel-air through comparatively narrow sections of the intake pipe, valves, etc. during the suction stroke. Turbulence plays a very vital role in combustion phenomenon The turbulence can be increased at the end of the compression by suitable design of combustion chamber. The effects of turbulence are:-
I. It accelerates chemical action by intimate mixing of fuel and oxygen, thereby reducing the ignition advance.
2. Turbulence increases the heat flow to the cylinder wall and in the limit excessive turbulence may extinguish the flame.
3. Excessive turbulence results in more rapid pressure rise resulting in engine to vibrate with rough and noisy running.
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