Application of droplet motion and evaporation model in fuel spray in the constant volume bomb

Abstract

The fuel oil atomization is closely related to the combustion performance of the fuel in the internal combustion engine. However, during the oil atomization, the fast evaporating and moving oil droplets interact strongly with the surrounding gas, posing challenges towards the precise simulation of the combustion process. To precisely capture the interactions between fuel droplets and the surrounding gas, a new multi-droplets motion and evaporation model is deduced by introducing the local parameters surrounding the fuel droplets. The proposed model is validated comparing the simulation results against the experimental data of the containment spray process. Subsequently, the present model is adopted to simulate the fuel spray process in the typical constant volume bomb. The parameters evolution is presented during the course of the spray such as the gas temperature, droplet temperature, evaporating rate, velocity, radii variation, vapor concentration and air-fuel ratio. The analysis of the spray performance is conducted and the superiority of the new model is also discussed. The simulation analysis reveals that the spray droplets interact strongly with the surrounding gas; the developed droplet motion and evaporation model is advantageous in the simulation of the dense multi-droplets spray process.

Numerical research of biodiesel spray coupled cavitation by different environmental simulations under high injection pressure

“…The fuel spraying process is very complicated and involves basic physical processes, such as primary crushing, secondary crushing, heat transfer evaporation, turbulent diffusion, and collision polymerization. Therefore, when the fuel is atomized, fuel droplets, fuel vapor, and a surrounding multiphase spray domain composed of gas will appear 16 . In the numerical calculation, thus, basic fluid governing equations were established first, including continuity equation, momentum conservation equation, energy conservation equation, component transport equation, and realizable k − E turbulence equation.…”

“…Therefore, when the fuel is atomized, fuel droplets, fuel vapor, and a surrounding multiphase spray domain composed of gas will appear. 16 In the numerical calculation, thus, basic fluid governing equations were established first, including continuity equation, momentum conservation equation, energy conservation equation, component transport equation, and realizable k − E turbulence equation. Then the DPM was used to establish a spray simulation model (Table 2).…”