点阵结构空气舵及内部流体热流固耦合研究

开展了钛合金TC4材料激光粉末床熔融(LPBF)工艺研究,在此基础上设计了多孔轻质空气舵模型,并基于有限差分法(FDM),采用三维流固耦合共轭传热数值计算方法,利用流体体积法(VOF)追踪流体自由液面,研究了典型的点阵夹层结构的空气舵内部冷却液动态换热过程的相互影响过程,考虑了冷却液与钛合金材料蒙皮间的耦合传热及湍流换热。结果表明,空气舵的内部流体压强随速度的增加而增加,从而导致流体出口的速度增加。当压强增加到一定程度时,流体的出口以水柱形式喷出。虽然较大的流体速度可以带走较多的热量,但是影响远小于对压强的影响。综合考虑空气舵的服役要求,获得了合适的冷却水入口速度。

Lattice Structure Air Rudder Heat-Fluid-Structure Interaction Analysis

The laser powder bed melting (LPBF) process of TC4 material was studied in use of air-controlling rudder. On this basis, a porous lightweight air rudder model was designed. Based on the finite difference method (FDM), a three-dimensional fluid-structure coupling conjugate heat transfer numerical calculation method was used to track the fluid free surface by using the fluid volume method (VOF).The interaction process of the dynamic heat transfer process of the internal coolant in the air rudder of a typical lattice sandwich structure was analyzed. The coupling heat transfer and turbulent heat transfer between the coolant and the skin of the titanium alloy material were considered in the analysis. The results show that the internal fluid pressure of the air rudder increases sharply with the increase of the speed leading to an increase in the velocity of the fluid outlet. When the pressure is increased to a certain extent, the outlet of the fluid is ejected as a water jet. Although a larger flow velocity of the fluid can carry away more heat, the effect is much less than the effect of the pressure. Taking into account the service requirements of the air rudder, the appropriate inlet speed of the cooling water is obtained.