长方体建筑物屋顶典型位置湍流特性研究

Research on turbulence characteristics of typical location on the roof of rectangular building

针对长方体建筑物屋顶6个典型位置开展流场数值仿真,获得了不同尺寸建筑物屋顶各典型位置高度2 m处的湍动能随建筑物长度、高度的变化规律。对于建筑物迎风面拐角点,低建筑物湍动能随建筑物高度变化的敏感性比高建筑物显著;随建筑物长度增加,迎风面边界中心点的湍动能峰值向建筑物高度降低的方向移动,且湍动能峰值随着建筑物长度的增加逐渐升高。除了工程上通常关注的典型点外,还获得了建筑物屋顶其他4个特征位置处的湍动能随建筑物尺寸大小的变化规律。该研究对建筑用风力机微观选址及安装技术参数确定具有一定的理论和实用价值。

In this article a fluent field numerical simulation was carried out for 6 typical positions on the roof of rectangular building, and a rule of turbulent kinetic energy at the height of 2 meters changing with the height and length of different buildings was obtained. The turbulence kinetic energy at the corner point of low building windward side had deep sensitivity over the change of building height;With increasing length of buildings,the turbulent kinetic energy＇s peak in building center of windward side gradually moved to the direction of building height decreasing, and the peak of turbulent kinetic energy increased gradually with the increasing of the length of the building. Besides the typical points that the engineering usually focuses on,the turbulent kinetic energy of the 4 other characteristic locations on the building roof variation with the size of the building were also studied.The relevant research results had theoretical and practical values to micro-siting of wind turbines fixed on the building and confirmation of the installation technical parameters.