基于CFD的蒸汽芯模加热过程仿真及结构优化

发布时间：2018-01-09 04:14

本文关键词：基于CFD的蒸汽芯模加热过程仿真及结构优化　出处：《哈尔滨理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：热芯缠绕工艺是一种基于内固化工艺的新工艺，实现了复合材料边缠绕边固化的一体化成型。其原理是将复合材料在芯模上缠绕成型的同时向芯模内通入高温高压蒸汽对其进行加热固化，因此具有生产效率高、成品质量佳、生产过程简单等优点，目前已应用于高压壳体的生产。对于热芯缠绕这种缠绕和固化一体化的工艺来说，固化成型过程中使芯模轴向温度按照期望分布十分重要。而芯模结构对于芯模轴向温度分布起着决定性作用。例如，由于通入高温蒸汽在到达芯模尾部时的能量损耗导尾部温度较低，使得尾部成型质量大大降低。而且芯模内部管道上的出气孔附近的芯模外表面温度更高，导致此处的壳体更易分层。针对这些问题，本文通过在小孔外设计导向芯模尾部的导流板对芯模结构加以改进，并通过仿真分析和实验验证对热芯缠绕工艺进行进一步研究。本文将首先介绍热芯缠绕工艺的工作原理，分析缠绕固化过程的内部多场变化原理，从而采用湍流模型、蒸汽相变模型、固流耦合动力学模型、传热模型，通过SIMPLE算法，对动量、能量控制方程进行解算，用流体仿真软件实现对整个加热过程的仿真模拟。然后，对本文设计的带有导流板的芯模结构改进方案建立多组不同导流板角度的模型。在相同入口压力下分析导流板角度对芯模表面温度分布的影响，经过对两组模型温度分布的分析，针对局部高温和尾部温度过低问题对角度进行优化，得到了一个优良角度范围。再在取自实际芯模的首中尾部三个压力值的入口压力下对几个优良角度进行第三组仿真，分析不同入口压力对选取角度的影响，对比其流场、温度场分布情况，并加入数学算法精确分析温度分布波动程度，，选出最适合的芯模模型和加热方案。经过以上几组仿真分析最终得到最适合的芯模结构。再通过实物进行对比实验，验证该方案能有效改善芯模局部高温和芯模尾部低温的问题，为使芯模温度按期望分布提供优化方法。
[Abstract]:Hot core winding is a new process based on internal solidification process. The principle is to heat and solidify the composite material with high temperature and high pressure steam into the core mold while winding the composite material on the core mold. Therefore, it has the advantages of high production efficiency, good finished product quality, simple production process, and has been used in the production of high pressure shell. For the hot core winding this winding and solidification integration process. It is very important to make the axial temperature distribution of the core die according to the desired distribution during the solidification process. The core mold structure plays a decisive role in the axial temperature distribution of the core mold. For example. Due to the low temperature of energy loss at the end of the core mold, the quality of the tail molding is greatly reduced, and the outer surface temperature of the core mold near the outlet hole in the inner pipe of the core mold is higher. In order to solve these problems, the structure of the core die is improved by designing the guide plate at the end of the core die outside the hole. And through the simulation analysis and experimental verification, the hot core winding process is further studied. This paper will first introduce the working principle of the hot core winding process, and analyze the principle of internal multi-field change in the winding solidification process, so as to adopt turbulence model, steam phase transition model, solid-flow coupling dynamics model, heat transfer model. The momentum and energy control equations are solved by SIMPLE algorithm, and the whole heating process is simulated by fluid simulation software. For the core die structure improvement scheme with guide plate designed in this paper, a number of different flow guide plate angle models are established, and the influence of guide plate angle on core mold surface temperature distribution is analyzed under the same inlet pressure. Through the analysis of the temperature distribution of the two groups of models, the angle is optimized for the local high temperature and the low tail temperature. A good angle range is obtained. Under the inlet pressure of three pressure values of the first and the tail of the actual core die, the third group of simulation is carried out to analyze the influence of different inlet pressure on the selection angle. The flow field and temperature field distribution are compared, and the fluctuation degree of temperature distribution is analyzed accurately by adding mathematical algorithm. The most suitable core mold model and heating scheme are selected. The most suitable core mold structure is obtained through the simulation and analysis above. It is verified that the proposed scheme can effectively improve the local high temperature of the core mold and the low temperature of the core mold tail, and provide an optimization method for the core mold temperature to be optimized according to the expected distribution of the core mold temperature.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33

【参考文献】