The 0D and 2D Numerical Simulation Study of N-heptane/Air Spray Autoignition
In this paper,the n-heptane/air spray autoignition process at an initial air temperature of 1200 K and a pressure of 607950 Pa is studied by zero-dimensional calculation and two-dimensional direct numerical simulation.Under the influence of droplet evaporation,a large temperature and concentration stratification is formed in the space.There are both high temperature chemical(HTC)reactions and low temperature chemical(LTC)reactions in the domain,and the phenomenon that LTC reaction lags behind the high temperature autoignition and the hot flame wraps the LTC reaction region.The most reactive mixture fraction corresponding to the high temperature ignition kernel is located on the lean mixture side,and it is greater than the result of 0D calculation,which is closer to the stoichiometric mixing.Through 0D calculation,the type of autoignition that may occur in the flow field can be predicted,the distribution of ignition position and the corresponding ignition delay time can be qualitatively determined.
NETL
NSTL
万方数据
