发动机旋转表面水滴撞击特性数值研究

Numerical Simulation of Water Droplet Impingement Characteristic on Aero-Engine Rotating Machinery

介绍了发动机旋转机械内部过冷水滴轨迹的三维数值计算方法,阐述了旋转坐标系下气流及粒子的运动规律。采用ANSYS-CFX软件及其粒子输运模型,对某发动机风扇转子叶片外围空气及水滴流场进行了数值模拟。利用水滴的速度矢量、撞击区域等参数表征水滴的撞击特性,获得了转速、水滴直径等对风扇叶片表面水滴撞击特性的影响:水滴撞击区域集中在风扇叶片迎风面叶盆侧,且水滴撞击区域随着转速的增加而减小;水滴在叶片表面的撞击范围随着水滴直径的增大而减小。

A methodology for three-dimensional numerical simulation of super-cooled water droplet trajec- tory through aero-engine rotating machinery is presented. Both flow and droplets＂ governing equations are described in the reference frame of rotating blades. By employing ANSYS-CFX and its particle transport model, the flow fields of both air and water droplet inside the fan blade passage are simulated. The water droplet impingement characteristic is displayed by its velocity vector and impingement limit. Simulation re- suits discover the impact of the rotational speed and droplet diameter on the impingement characteristic on the fan blade surface. The droplet impingement region is located on the pressure surface of the fan blade. The impingement area decreases with the increasing of the rotational speed and water droplet diameter.