The Simulation Research And Structure Optimizaiton Of Steam Heating Process Of Heated Mandrel Winding Based On CFD

The heated mandrel winding is a new process improved based on theinternal curing method. During the process, the steam with high temperature andhigh pressure is injected while the composite on mandrel is molding to realize thecuring. The composite molding process is also incorporate as the winding andcuring are conducting at the same time. The process, the heated mandrel winding,has high production efficiency, strong voltage endurance capability simpleproductive process and so on and has been used in the production of high-pressure shell.It is very important for the temperature of mandrel in axial direction to bedistributed as expected in the incorporate process of winding and curing. Forexample, the temperature of high-temperature steam becomes lower when it istransferred to the mandrel tail because of energy loss, which leads to the lowmolding quality for tail. Besides the outer surface temperature of mandrel ishigher around air outlet hole on the inner pipeline for mandrel, which inducesdelamination to the shell here easily. In the paper, the mandrel structure isimproved by adding deflector on the holes aiming at the problems, and the heatedmandrel winding process is further studied by simulation and experiment.Firstly, the operating principle of the heated mandrel winding process isintroduced and the mathematical model on the winding and curing of compositeduring steam heating of mandrel. The related models are turbulence model, vaporphase transformation model, solid-liquid coupling dynamics model and heattransfer model. Energy and momentum control equations are also added and theSimple Algorithm is applied to simulate the whole heating process under the help of UFD software. Secondly, models with different angles for deflector are builton improved project. The influences of different angles for deflector on thetemperature distribution of mandrel surface are analyzed on the condition of thesame inlet pressure. We can gain fine angles improving local high temperatureand lower temperature of mandrel tail by analyzing the temperature distributionand streamline distribution of the model during numerical simulation. Theinfluences of different inlet pressures on chosen angles are analyzed and thedistributions of flow field and temperature field are also analyzed. At the sametime mathematical algorithm is used to analyze accurately the fluctuation oftemperature distribution, and we can gain the fittest mandrel structure andheating project. Finally, contrast experiments is conducted to verify the projectimproving local high temperature and lower temperature of mandrel tail. And theproject make it possible that the temperature of mandrel is distributed asexpected and the heated mandrel winding process is optimized effectively.