Performance Optimization of Marine Diesel Engine Blended with Butanol Based on Orthogonal Experimental Design with One-Order Regression Orthogonal
To optimise the performance of the butanol-diesel dual-fuel engine,a dual-fuel engine high-pressure cycle model is developed by AVL-FIRE simulation software with a 4190ZLC-2 marine medium-speed diesel engine as the prototype,and the accuracy of the model is verified with the original engine.After determining the butanol blending ratio of 20％,a regression orthogonal test design method is used to optimize 5 parameters of the fuel system to find out the combination of parameters indicating the maximum power and the minimum NOx emission.The results show that the prediction models of indicated power and NOx emissions are highly accurate and can be used for parameter optimisation.The maximum combination of parameters for the indicated power is:exhaust gas recirculation rate of 0％,intake pressure 0.233 MPa,intake air temperature 325.15 K,injection advance angle 22.6℃A and injection hole diameter 0.26 mm;the lowest combination of parameters for the NO emissions is:exhaust gas recirculation rate 12.5％,intake pressure 0.173 MPa,intake air temperature 355.15 K,injection advance angle 16.6℃A,injection hole diameter 0.32 mm.Compared with that of the original machine,the optimised indicated power and NOx emissions is 7.4％higher and 98.3％lower,respectively.
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