Aerotransport Profile Design Based On UG Secondly Development And Analysis Of The Aftbody's Flow Distribution

The aerodynamic design of transport is very important for the economical efficiency.Considering the performance of takeoff and landing,the aftbody is usually made upswept. The configuration like that would lead to drag force increase.It is very necessary to analyse the performance of flow distribution as the aftbody's parameter changes and then a more reasonable configuration must be suggested. There would be so many shortcomings if we make the three-dimensional manually everytime. Firstly, mannual drawing should make differences in many aspects, such as the method of surface creating, the proceeding of the curve creating. Secondly, it was so inefficient that makes three-dimensional profile by hand. These problems can be solved if the profile is made automatically by computer. UG as a sucessful commercial software, its API affords many methods to make the profile automatically. Because the data was got by measurement or recovering process, curve fairness problem was coming. A new algorithms based on optimization of the disparity between real and perfect divided differences was proposed.And then, this paper analysed the flow distribution around the aftbody and the reason for the performance in chapter four.As the aftbody's parameters changed, the drag force components changed as a result. The law was revealed in chapter four too. In the end, this paper proposed an scheme of aftbody configuration and compared the drag force between formal and improved. The result indicated that the improvement is successful.