State four method to control diesel smoke.

State four method to control diesel smoke.
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Answer :

Methods to Control Diesel Smoke : 1. De-rating:- At lower loads, the air: fuel ratio obtained will be leaner & hence the smoke developed will be less. However this means a loss of output. 2. Maintenance: - Maintaining the injection system of engine properly results in a significantly reduced smoke, best engine performance, and clean exhaust system. Other methods are changes in Combustion chamber geometry. 3. Smoke suppressant additives:- Some barium compound, if used in fuel, reduce the temp of combustion, thus avoiding the soot formation, & if formed- they break it into the fine particles, thus appreciably reducing smoke. 4. Fumigation: - Fumigation consists of introducing a small amount of fuel into the intake manifold. This shortens the delay period- curbs thermal cracking which is responsible for soot format 

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