摘要
针对非同轴喉栓发动机喷管绝热层长度增加后,喉栓内部温度不降反升的现象,建立不同绝热层长度的系列三维喷管模型进行数值仿真计算,得到喉栓的温度分布和周围燃气的压强、速度、温度分布。通过对绝热层与喉栓之间狭缝内的流场进行分析,发现狭缝中存在燃气环绕喉栓流动的现象,这种环绕流动受狭缝上下方入口的压强差影响,又分为单侧绕流和双侧绕流两种。过长的绝热层会使狭缝上下方入口压差上升,燃气绕流形式由双侧绕流变为单侧绕流,流动传热效果增强,喉栓结构温度升高。通过比较两种燃气绕流形式下的喉栓温度,得到了喉栓绝热层长度与结构温度分布的响应关系,提高了对喉栓结构温度分布的预测精度。
A series of three-dimensional nozzle models with different insulation layer lengths are established for numerical simu-lation calculation to address the phenomenon of the temperature inside the non coaxial throat plug engine nozle not decreasing but rising after the length of the insulation layer increased.The temperature distribution of the throat plug and the pressure,ve-locity,and temperature distribution of the surrounding gas are obtained.By analyzing the flow field in the slit between the insu-lation layer and the throat plug,it is found that there is a phenomenon of gas flow around the throat plug in the slit.This flow is influenced by the pressure difference between the inlet above and below the slit,and can be divided into two types:unilateral flow and bilateral flow.An excessively long insulation layer will cause an increase in the inlet pressure dfference between the upper and lower parts of the slit,and the gas flow pattern will change from bilateral flow to unilateral flow.The flow and heat transfer effect will be enhanced,and the temperature of the throat plug structure will increase.By comparing the temperature of the throat plug under two dfferent forms of gas flow,the response relationship between the length of the throat plug insulation layer and the temperature distribution of the structure is obtained,which improves the prediction accuracy of the temperature distribution of the throat plug structure.
作者
娄永春
赵志
赵瑜
马新建
温雄飞
LOU Yongchun;ZHAO Zhi;ZHAO Yu;MA Xinjian;WEN Xiongfei(Shanghai Space Propulsion Technology Research Institute,Shanghai 201109,China)
出处
《弹箭与制导学报》
北大核心
2023年第5期39-44,共6页
Journal of Projectiles,Rockets,Missiles and Guidance
关键词
喉栓式发动机
流动传热
热防护
狭缝
数值计算
throat plug engine
flow heat transfer
thermal protection
slit
numerical calculation
