![]() ![]() The swirl ratio used to indicate the extent of rotational motion within the combustion chamber. Swirl is the main mechanism to spread the flame within the combusĀtion chamber. Swirl enhances mixing and makes the flue air mixtures homogeneous. The swirl is achieved by a variety of methods like shaping the intake manifold, valve, valve port and at times by suitably contouring the piston. The rotational motion of air within the cylinder is called swirl. (ii) Again during compression the turbulence increases as swirl, squish and tumble. (i) Turbulence is quite high during suction and recedes towards BDC.
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