INVESTIGATIONS ON THE PERFORMANCE AND EXHAUST EMISSIONS OF A DIESEL: SMOKE EMISSION

SMOKE EMISSION

The smoke emission will be normally low if the combustion is homogeneously mixed combustion and it is a solid suspended particle in exhaust gases. The figure.6 Shows the smoke emission for MI oil without and with pre heating with respect to brake power.

It is seen from the figure.7 that the smoke increases with increase in load. Raw MI oil without preheating produced Smoke emission of 0.5 BSN at no load, 2.8 BSN at 75% of full load and 4.4 BSN at full load but the smoke with preheating was 0.5 BSN at no load
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Figure : 7 Smoke for MI Oil with/without preheating


Smoke increases with increase in load. The smoke emission was 0.5 BSN at no load to 3.1 BSN at 75% of full load for raw oil, 0.9 BSN at no load to 3 BSN at 75% and 3.2 BSN at full load. Therefore the reduction in smoke was 10% at 75% of full load and 27% at full load than raw MI oil. The preheating proves that the heating effects very much in reducing the smoke emission by improving the combustion and oxidizing the soot particles to large extent.

The method of preheating infers the improvement of engine performance and reduction of engine emission to a considerable limit compared to that of without preheating. At full load for 3 deg CA retard injection timing the improvement in power output indicates the improvement in combustion, during that period the smoke gets oxidized to some extent.