An application of design of experiments approach to statistically model and optimize performance parameters of a single cylinder four-stroke diesel engine

Harjeet Kumar, Dr. Barnali Chowdhury

Abstract


This paper investigates the application of design of experiments to enhance the performance characteristics such as indicated thermal power and mechanical efficiency of a four-stroke diesel engine with single cylinder. The dependent response variables are examined by varying the independent variables namely engine speed from 1421 to 1435 rpm, load from 18 to 28 kg and fuel flow rate from 2.5 to 3 kg/h. The influence of the input parameters and their interactions on the response functions are quantified using mathematical models. Statistical analysis comprising of analysis of variance, residuals, Pareto and normal probability are used for validating the models and obtaining relevant parameters. Engine load is proved to be the most significant factor influencing the indicated thermal power while fuel flow rate considerably impacts the mechanical efficiency. The optimum settings of the input variables are determined to be engine speed of 1435 rpm, load 28 kg and fuel flow rate 2.5 kg/h. The indicated thermal power is maximized to 27.3025 kW whereas mechanical efficiency have been increased to 80.0775 percent with the optimum settings.

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References


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