挡板对液体推进剂晃动力的影响

Effect of Baffles on Sloshing Modulated Forces and Torques Responsed to Input Orbital Accelerations in Microgravity

研究了全尺度重力探测卫星－Ｂ贮箱对于安装档板和不安装挡板情形下液体推进剂晃动的流体动力特性。结果显示， 以重力瞬变加速度和重力梯度加速度为作用力的轨道加速度使液体推进剂产生了晃动，安装挡板使晃动幅度减小。由于推进剂在贮箱中上下运动的同时伴随着左右运动而产生了作用于贮箱上的力， 通过液体推进剂与贮箱壁面的应力关系计算了作用在贮箱上的力。计算模拟结果显示， 挡板产生的阻尼在减少流体晃动的同时也减少了流体作用在贮箱上的力， 在垂直于挡板方向减少的幅度更明显。

The behavior of sloshing dynamics modulated fluid systems driven by the orbital accelerations including gravity gradient and jitter accelerations with partially filled rotating fluids applicable to a full scale Gravity Probe B Spacecraft dewar tank with and without installing a baffle board have been investigated.Results of slosh wave excitation along the liquid vapor interface is induced by jitter acceleration dominated orbital acceleration which provide a torsional moment with an up and down movement of bubble oscillations in the rotating dewar.Fluctuations of fluid stress forces and fluid stress moment (torque) exerted on the dewar wall of container caused by slosh wave excitation driven by the orbital acceleration are also investigated.As viscous force between liquid solid interface,and surface tension force between liquid vapor solid interface can greatly contribute to the damping effect of slosh wave excitation,rotating dewar installed with baffle provides more areas of liquid solid and liquid vapor solid interface than that of rotating dewar without installing baffle.Results show that damping effect provided by baffle reduces the amplitudes of force and moment feedback from the fluids to the container,in particular,the components of fluctuations transverse to the direction of baffle boards.