Study of the Combustion and Soot Generation Characteristics of Gasoline-diesel Dual-fuel Engines by Blending PODE
In this paper,the in-cylinder combustion characteristics and soot generation processes of diesel blended polyoxymethylene dimethyl ethers(PODE)-gasoline reactivity controlled compression ignition mode were collected on an optical engine using high-speed imaging combined with the two-color method for clean fuel replacement of conventional fuels.The test results showed that with the increase of PODE blending at the same premixed ratio,the peak in-cylinder pressure,peak heat release rate and pressure rise rate were reduced,the ignition delay was extended,the combustion duration was increased,the combustion phase was shifted back and the combustion tended to be gentle.At a premixed ratio of 50％,the total heat release volumes from single cycle combustion of P20D80 and P50D50 as direct injection fuel was 97.89％and 95.39％of the total heat release volumes of direct injected P0D100 respectively,the total soot generation from single cycle was 55.22％and 36.55％of that of direct injected P0D100 respectively,the high temperature region of soot was reduced by 52.9％and 73.32％respectively,the stable values of soot average temperature were reduced by 6.65 K and 20.25 K respectively,and the stable values of soot average KL factors were reduced by 10.35％and 16.12％respectively.In contrast,P50D50 as a direct injection fuel ensured high combustion thermal efficiency and effectively suppress the generation of soot.
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