Abstract
To clarify in more details the effect of swirl on the engine performance, a continuous alteration of swirl characteristics was made during the operation of engine by making use of the "variable angle swirler" installed around the scavenging ports of a uniflow scavenging engine. On the basis of the results obtained from the steady flow measurements in the cylinder, the effect of the swirl was mainly discussed in relation to the fuel distribution characteristics by inspecting it through the fuel consumption and the exhaust smoke. As the result of experiments, the difference between the optimum swirls for the exhaust smoke and for the fuel consumption, the relation between the geometrical configuration of injection jets and the swirling motion of air, the effects of the load and the shape of the combustion chamber on the optimum swirl, etc. were clarified.
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