Numerical Simulation Of Leak And Diffusion Of Hydrogen

The security of high pressure hydrogen tank is being regarded as key technique with the extensive application of hydrogen energy currently. This paper makes a research on crack's stabilization and numerical simulation of leakage and diffusion of hydrogen under the pecuniary aid of "863" national high technique items on this background.Contraposing to the forced situation and characteristics of hydric physics and chemistry , this paper makes research on crack's stabilization, which provides theories foundation for estimate of life-span for hydrogen tank. Then,gives numerical simulation of the leak and diffussion of hydrogen is also given, which provides reference for the security alarm system for the leak of hydrogen.(1) The force situation and expanding of crack are systematically analyzed,and the relationship between the factors which influence spread of crack is established firstly. then , the theoretical analysis on speed of expanding of crack. is given.(2) Based on specifical condition, Mathematics model of the flow of hydrogen's leakage and diffussion and detailed academic depiction for method of calculation is determined.(3) The flow of the leak and diffussion of hydrogen is simulated by FLUENT software,and the distribution of pressure, velocity, concentration of hydrogen, explosible area of flow are analyzed. In the meantime, the influence of pressure, apertures and foreign breeze to the flow of leak and diffusion of hydrogen are contrasted and analyzed.(4) Change of astatic flow along with time of leak is analyzed, and the influence of single venthole's position and size on distribution of hydrogen are considered. Through simulating the flow of leak and diffusion of hydrogen under obturated space, some rationalized suggestions on disposition of sensor are given.