基于LBM理论的涵道飞行器CFD分析  

The Study on Ducted Fan Aircraft CFD Analysis Based on LBM Theory

作　　者：李明达[1] 刘国松[1] 刘亮[2] 钟月曦 LI Ming-da(Changchun Institute of Technology,Changchun 130012,China)

机构地区：[1]长春工程学院,长春130012 [2]长春理工大学,长春130022

出　　处：《长春工程学院学报（自然科学版）》2019年第4期24-28,共5页Journal of Changchun Institute of Technology：Natural Sciences Edition

基　　金：吉林省科技发展计划项目—重点科技研发项目(20180201024SF)。

摘　　要：针对涵道飞行器流体力学复杂、CFD分析中动网格质量难以保证等问题,采用基于LBM方法、空间粒子具有自适应性的商用流体动力学软件XFlow,建立了具有复杂几何结构的风机扇叶、涵道飞行器模型以及该模型所在的虚拟飞行环境,根据风机扇叶上、下外表面速度场分布确定有效的时间步长,在该时间步长下进行了无涵道单风扇和涵道飞行两种工况的CFD分析,包括对喷射气流的速度等值面分布、中心截面区域的速度场分布、多尺度粒子团的截面分布等进行了分析,仿真结果表明:在基于LBM的CFD仿真中,应合理设置时间步长,以保持仿真计算量与仿真准确度的平衡;涵道风扇外边缘可产生高达90m/s的气体流速;与采用相同尺寸扇叶的旋翼飞行器相比,涵道飞行器可提供其2.24倍的推进力。Aiming at the problems of complex fluid mechanics in ducted fan aircraft and difficult to guarantee the quality of dynamic mesh in CFD analysis,this paper uses commercial fluid dynamics software XFlow with the adaptive property based on LBM method and spatial particles.The fan blade and ducted fan aircraft model with complex geometric structure,the virtual flight environment are established.In virtual flight environment,the effective time step is determined according to the velocity field distribution of the upper and lower outer surfaces of fan blades.Using this time step,CFD analysis of single fan without ducted and ducted fan flight conditions are carried out including velocity isosurface distribution of jet airflow,velocity field in the center section area and multi-scale particle clusters section distribution.The simulation results show that the time step should be set reasonably in the CFD simulation based on LBM theory in order to keep the balance between simulation calculation and accuracy;the outer edge of fan in the ducted can generate airflow velocity up to 90 m/s;compared with the rotorcraft with the same size of fan blade,the ducted fan aircraft can provides 2.24 times the propulsion.

关 键 词：涵道飞行器 CFD LBM 

分 类 号：V279[航空宇航科学与技术—飞行器设计]