密闭空间内射流冲击波传递特性

Transfer Characteristics of Shock Wave in the Confined Field

为研究密闭空间内射流冲击波传递过程及载荷特性,针对冲击波开盖技术中发射箱内冲击波传递问题,利用基于Re alizable k-ε湍流模型的雷诺平均方法建立计算分析模型,并与试验对比,验证模型的可行性。在此基础上分析冲击波传递过程及载荷特性,考察冲击距离比k_(L)(喷管出口至后盖距离与喷管出口直径比)、有效通流截面比k_(S)(压力波传递的有效通道面积与弹体圆柱段截面积比值)、堵盖开启时刻燃烧室总压p_(0)对冲击波传递的影响规律。结果表明:k_(L)在0.1~4范围内变化时,前盖受到的压强载荷随k_(L)的增大呈先增加后减小再增加的趋势,拐点分别为0.3、0.8;k_(S)在0.1~3范围内变化时,前盖受到的压强载荷随k_(S)的增大呈先增加再减小;p_(0)在1~2.25 MPa范围内变化时,前盖受到的压强载荷随p_(0)的增大而增大。

In order to study transmission characteristics of the shock wave in the confined field,a numerical simulation model based on realizable k-εturbulence model is established for the shock wave transmission process in the launching box.The feasibility of the model is verified by comparing with the experimental data.On this basis,numerical method is used to analyze the shock wave transmission process and load characteristics in the launching box.The influence of initial shock distance k_(L),effective flow area k_(S)and closure opening-pressure p_(0)on shock wave transmission is studied.The results show that,when k_(L)varies from 0.1 to 4,the pressure on the headcover first increases,then decreases,and finally increases with the increase of k_(L),and the inflection points are 0.3 and 0.8.When k_(S)varies from 0.1 to 3,the pressure on the headcover first increases and then decreases with the increase of k_(S).When p_(0)varies from 1 Pa to 2.25 Pa,the pressure on the headcover increases with the increase of p_(0).