一种卫星天线罩上升过程定常流动数值模拟

Steady numerical simulation of flow over an ascending satellite radome

在发射的主动上升段,由于天线罩突出卫星密封舱表面,天线罩将承受气流冲刷作用,为了准确设计天线罩抗力学环境,需要对上升段天线罩的受力情况进行详细计算和分析。根据具体的弹道参数,卫星上升过程中最大动压对应的马赫数约为1.4,基于此选择动压最大的马赫数段(Ma=1.0~1.8),采用数值模拟方法详细计算分析了定常状态下天线罩在不同马赫数、不同迎角下的气动力载荷和力矩载荷。结果表明:随着马赫数的增加,天线罩所承受的气动力载荷和力矩载荷均表现为先增大后减小,最大气动力载荷出现在Ma=1.2,大小约为435.5N,最大力矩载荷出现在Ma=1.4,大小约为14.5Nm;随着迎角的增加,天线罩气动力载荷呈现增大趋势,但增幅较小。在实际飞行中天线罩的局部或全部已经淹没在火箭弹身的边界层中,因此弹身的存在对天线罩的迎角效应会产生影响。

During rocket launching,the radome undergoes air flow swashing protrusion of the satellite hermetic cabin surface.Inorder to accurately design mechanical environment over the radom e,the aerodynamic loads of the ascending radome are required to be calculatedand analyzed.The maximal dynamic pressure appears at a Mach num ber of.4accordingto the detailed trajectory parameters.Based on this behaviorthe Mach num ber range of M a=1.0~1.8was chosen for m axim um dynamic pressure^and numerical method was used to calculatethe power load and torque load of the radome at different Mach num bers and attack.The results indicate that the power load and torque load of the radome increase at the beginning,and then decrease at ascendingbranch with M a=1.0-1.8.The power load achievesm axim um value of about435.5N at M a=1.2,and the torque load achieves m axim um value ofabout4.5Nm atM a=0.4.The power force grows slowly as the angle of attack increases.Duringactual flig h t,local or all of the radome is subm erged at the boundary layer of the rocket body,sothat the existence of the rocket body influences the angle of attack effect of the radome.