Design and study of multi-component fuel for tracer LIF in engine basing on thermal gravity analysis and VLE calculation

A method to design a feasible multi-component test fuel for fuel concentration measurements by using PLIF was developed based on thermal gravity(TG) analysis and vapor-liquid equilibrium(VLE) calculations. The optimized multi-component fuel contains n-pentane(light fractions), isooctane, noctane (medium fractions), n-nonane and n-decane(heavy fractions). It has the similar volatility to the real 93^# gasoline and all the tracers have a good co-evaporation ratio. Acetone, toluene, and 1, 2, 4-trimethylbenzene were separately chosen as tracers for the light, medium, and heavy components of gasoline. Optimized results of a six-component fuel(C₄ added) and the advantages and disadvantages of this case are discussed. The temperature impact was also studied. Results show that the light and medium components in the fuel have smaller changes in co-evaporation ratio, while the heavy components show the difference. An optimization was made at 373,K to give better synchronous evaporation.