基于OpenFOAM 的异戊烷闪蒸喷雾动力学特性研究

The explosive flashing spray may occure during the accidental release of flammable and toxic pressure-liquefied gases in chemical or nuclear industry due to the failure of a vessel or pipe in the form of a small hole. It is quite important to predict the spray dynamics of the flashing spray for the risk assessment of accident hazards. This paper conducted a numerical study on iso-pentane flashing spray by open source C++ library OpenFOAM. The numerical results of spray images under different initial pressures and temperatures, and droplet diameter and velocity distribution all agreed with the experimental data well measured by high-speed camera and Phase Doppler Particle Analyzer (PDPA). The results indicated that increasing pressure and superheat degree led to an increase in atomization magnitude, radial expansion, spray angle and droplet velocity at nozzle exit due to the intensive nucleation, while a decrease in droplet Sauter mean diameter (SMD) and penetration distance. It also enhanced the spray uniformity.