A Two-dimensional Model and Calculation for the Process of Laser Ignition
WENG Chun-sheng, WANG Zhen, FENG De-cheng(School of Power Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China)
A transient, two-dimensional heat conduction model about laser ignition based on thermal mechanism was developed in this paper. Influences of the laser energy distribution, reactant concentration, heat convection and radiation factors are considered in the model. Its partial derivative equation is solved by alternating direction implicit algorithm. Influences of some factors, such as laser pulse width, beam radius, thermal conduction and depth absorption coefficient, on the ignition of Mg/NaNO 3 were analysed. Results show that the incidence power, the laser pulse width and the beam radius are main factors effective for ignition characteristics of energetic material. In shorter ignition time, the variance in thermal conduction coefficient has less influence on the ignition process and the varienc of the absoption coefficiet has more influence on it.
【CateGory Index】： TN249;TJ410.1