Browse Publications Technical Papers 2020-01-1356
2020-04-14

Dimensional Optimization of Key Parameters Using DoE Technique to Achieve Better NOX Emission Values in Mass Production of Single Cylinder Small Diesel Engines for 3 Wheeler Applications. 2020-01-1356

Oxides of Nitrogen (NOx) emissions are considered as one of the harmful emissions globally which has a direct influence on human beings as well as the environment. This works deals about a strategy for reducing NOx pollutant from an automotive engine. Catalytic converters and particulate filters are mostly used as after treatment device for CI engines to control the limits of the pollutants from the tail pipes, but the real ingenuity lies in achieving the same effect through in - cylinder combustion. Optimization of the critical factors like Nozzle Tip Protrusion (NTP), Static Injection Timing (SIT), Bumping Clearance (BC) and Swirl Number are the most important engine design parameters in achieving the optimum combustion which might result in the release of minimal harmful pollutants. In this work, L9 Orthogonal Array (OA) table was used in designing experiments for studying the interactive model between the said factor and its levels on NOx emissions. Absolute value of NTP considering the tolerance limit is set as 3.0 mm, 3.15 mm and 3.30 mm and similarly SIT, BC and Swirl Rate is set as 0.19 mm, 0.23 mm, & 0.27mm, 0.65mm, 0.70 mm & 0.75 mm and 2700 rpm, 2750 rpm and 2800 rpm respectively. Single cylinder diesel engine was chosen as the test engine. Test was conducted on the basis of standard OA table and corresponding NOx emissions were measured. It is found that, NTP of 3.0 mm, SIT of 0.27 mm, BC of 0.65 mm and Swirl Rate of 2800 rpm yielded the optimum NOx emissions consistently. It comes to know that the above mentioned process combination statistically demonstrated lesser NOx. It is concluded from the results that the reduction of NOx by 22% with minimum engine to engine variation is achieved without increase in the manufacturing cost by this technique.

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