Numerical Analysis of The Micro-Scale Diffusion Flame Characteristics of AP/HTPB Propellant Combustion
A two-dimensional periodic sandwich combustion model of micro-scale AP/HTPB,about 100 μm,was built to investigate the combustion characteristics of composite solid propellant in a rocket environment.The gas phase and solid phase are coupled at the surface by thermal feedback.A two-step simplified global reaction mechanism is employed to characterize AP monopropellant flame and the diffusion flame between the decomposition products of AP and the pyrolysis products of HTPB.AP monopropellant flame is concentrated in a thin sheet over oxidizer and the role is to maintain self-sustaining decomposition.To some degree,AP deflagration in the gas phase can be assumed as surface ingredient of the condense phase.The Peclet(Pe)number and Damkohler(Da)number are introduced to represent the relative magnitude of mass diffusion time,flow residence time and reaction time.The effects of pressure,AP particle diameter on the characteristics of the diffusion flame of AP/HTPB propellant combustion are discussed based on Pe number and Da number.Results shows that the Pe is O(1)and Da number is 100-1000 when AP particle size is 140 μm and the pressure is 20~100 atm.The diffusion flame characteristics is changed according to the changes of diffusion flame height and the location of reaction heat kernel.When AP particle size changes from 140 μm to 60 μm,the diffusion time scale decreases and pre-mixed combustion effect is enhanced.The calculation results show the reference value for deeply understanding the characteristics of the diffusion flame of AP/HTPB propellant combustion.
AP/HTPB composite solid propellant combustion characteristics Pe number Da number
Rui Ye Yonggang Yu Yongjie Cao
Nanjing University of Science & Technology,Nanjing,China
国际会议
桂林
英文
1-10
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）