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一部分增压气体带入的能量通过与壁面热交换传递给贮箱壁面,传热过程快慢与增压气体流场和贮箱结构密切相关,而贮箱增压计算与结构设计分开进行,造成设计过程繁琐且周期较长,因此贮箱增压与结构耦合分析对于贮箱的设计具有重要意义。从现有文献来看,研究人员主要采用零维整体模型与一维分层模型分析增压过程,但以上两种模型仍存在不能展示箱内物理量的径向及局部分布等缺点,造成增压计算与结构耦合分析难以开展,计算流体力学技术将弥补这方面的不足。本文基于VOF(Volume of Fluid)方法建立了液氧贮箱的二维轴对称非稳态模型,对贮箱增压过程进行了数值模拟,固壁区的传热采用热阻试算法计算,通过与贮箱遥测数据进行比对,验证了模型的正确性。模型计算得到了气枕压力、和贮箱壁面温度的变化规律,并对壁面厚度和温度、增压气体温度和流量及其之间的作用规律进行了优化分析,结果显示增压气体温度、流量、壁面温度与厚度有强烈的耦合关系,结论可为贮箱结构设计提供理论依据。
Part of the pressurized gas into the energy transfer through the heat exchange with the wall to the tank wall, the heat transfer process and the pressurized gas flow field and tank structure is closely related to the tank pressure booster calculations and structural design separately, resulting in design The process is tedious and the cycle is long, so the analysis of tank pressurization and structural coupling is of great significance to the design of the tank. From the existing literature, researchers mainly use the zero-dimensional overall model and the one-dimensional layered model to analyze the supercharging process. However, the above two models still can not display the radial and local distribution of the physical quantities in the box, etc., resulting in supercharging Calculation and structural coupling analysis is difficult to carry out, computational fluid dynamics technology will make up for this deficiency. Based on the VOF (Volume of Fluid) method, a two-dimensional axisymmetric unsteady model of liquid oxygen storage tank was established. The supercharging process of the tank was numerically simulated. The heat transfer in the solid wall was calculated by the thermal resistance test. Compared with the telemetering data of tank, the correctness of the model is verified. The model was used to calculate the pressure of the pillow and the change of the wall temperature of the tank. The thickness and temperature of the wall, the temperature and flow of the pressurized gas and their interaction were optimized. The results showed that the temperature, flow rate , Wall temperature and thickness have a strong coupling relationship, the conclusion can provide a theoretical basis for tank design.