站台活塞风附壁射流理论建模与求解

The Theory Model and Solution of the Wall Jet of Platform Piston Wind

给出站台活塞风基本定义,提出站台活塞风附壁射流理论。通过数学建模,得到站台活塞风起始段和主体段的理论数学模型,其中起始段模型解析式分为边界层区、势流核心区和自由剪切区,主体段模型分为边界层区和自由剪切区。通过解析式求解方法和数值模拟分析,获得站台起始段和主体段典型点速度动态变化规律和代表时刻垂直壁面典型截面速度分布,两种方法结果吻合较好。理论计算结果得到了现场实测的验证。

The platform piston wind is defined firstly. Then, the wall jet theory of the platform piston wind is put forward. Through the mathematical modeling, the initial segment and main section theoretical model of the platform piston wind is built up. The initial segment is divided into boundary layer area, potential flow core area and free shear zone. The main section is composed of boundary layer area and free shear zone. The typical point velocity dynamic characteristics and the typical section velocity distribution in the vertical wall direction both in the initial segment and main section are obtained based on the theoretical expression solution and numerical simulation. The results of the above two methods coincide each other. The theoretical results are verified by the field measurement.