Numerical Simulation Research on Conditions of Liquid LNG Flash Boiling Spray
The quality of fuel atomization can be improved by flash boiling spray,which is very beneficial to the formation of air-fuel mixture in the cylinder,so it is very important to study the flash boiling spray of LNG First of all,the flow process of LNG inside the nozzle is analyzed,and the calculated results are taken as initial and boundary conditions of LNG spray calculation.On this basis,a numerical simulation model of pure liquid LNG flash boiling spray is created to investigate the development of the spray process,and the conditions of LNG liquid injection occur flash boiling phenomenon are determined.All results obtained by the numerical model of LNG flash boiling spray are consistent with the exact solutions given in the literatures.The results show that,when the ambient pressure is in the range of [0.1 MPa,4.59 MPa],flash boiling phenomenon occurs,as long as the ambient pressure is lower than the saturation vapor pressure of the liquid LNG;when the ambient pressure is more than 4.59 MPa,no matter how the temperature of liquid LNG changes,flash boiling phenomenon never occurs.It is also found that the shape of LNG flash boiling spray remains incompletely symmetrical cone,and the droplet diameter decreases rapidly in the process of development.A vortex structure in spray tip is formed,and then the structure is broken and disappeared.
NETL
NSTL
万方数据
维普
