摘要
为了解微燃烧器内固体含能材料燃烧的影响因素,采用ANSYS瞬态热分析研究了微细圆管燃烧器内固体药柱燃烧时,燃烧器尺寸、壁厚和壁面热传导系数对燃烧器壁面温度分布和热损失的影响。结果表明:燃烧器壁面的热量传递是决定微尺寸下能否稳定燃烧的关键。随着燃烧器尺寸的减小,加强了燃气和壁面的相互作用,热损失增大,导致燃烧不稳定甚至熄灭。而壁面热传导系数对壁面热量传递起着竞争的作用,随着壁面热传导系数的减小,壁面热损失和壁面轴向传导至预热区的热量均减小,但前者的作用较大,利于燃烧稳定。另外研究表明,在一定壁厚范围内,增加壁厚有利于燃烧稳定。
To understand the effect factors of solid energetic material combustion in microcombustion,the effect of the dimensions and thickness of combustor and the thermal conductivity of its wall on the temperature distribution of wall and the heat loss of a microtube combustor during the burning of solid grain in the microtube combustor was studied by transient-state thermal analysis under ANSYS.Results show that the heat transfer of combustor＇s wall is the key factor for combustion stability in microtube combustor.With the reduction in the dimensions of combustor,the interaction of gas and wall is strengthened,and the heat loss is also increased,resulting in the instability or extinction of combustion.The simulation also indicates that the thermal conductivity of wall has the competing effect on the heat transfer of combustor＇s wall.The heat loss of wall and the heat transferred through the wall axially to the preheated zone decrease with the reduction in the heat conductivity of wall,however,the former makes greater contribution,which improves combustion stability.In addition,a thicker wall is beneficial to combustion stability in a certain extent.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2010年第10期1346-1350,共5页
Acta Armamentarii
关键词
热学
微细圆管
燃烧
壁面
热损失
稳定性
数值模拟
thermology
microtube
combustion
wall
heat loss
stability
numerical simulation
