项目名称: 基于本征正交分解方法的一种振动壁面非定常流动控制机理研究
项目编号: No.51306089
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 能源与动力工程
项目作者: 傅鑫
作者单位: 南京航空航天大学
项目金额: 24万元
中文摘要: 近年来随着航空器研制的需要和流动控制技术本身的进步,人们越来越注重在各种内流、外流航空流体机械中发展和利用流动控制技术。振动壁面流动控制方法相对周期性吹吸气、合成射流等控制方法,具有无外接气路、结构重量轻、控制分离潜力大等优点,更重要的是其具有在非控状态下不破坏原有流场几何形状的优点。本项目引入本征正交分解方法,通过对其进行傅里叶变换处理,建立一套针对典型振动壁面流动控制的非定常流动分析方法。将某典型振动壁面流动控制方法安置于大扩压通道内,采用大涡模拟CFD技术分析获得不同控制参数下扩压通道内的详细流场信息。运用发展了的本征正交分解分析方法对该振动壁面控制下的大扩压通道不同模态的流场结构信息加以分析研究,获得该控制方法对扩压通道内亚音速流动分离抑制的控制机理和内在规律。
中文关键词: 本征正交分解;流动分离;非定常控制;模态分析;
英文摘要: With the development of aircraft needs and flow control technology in recent years,people pay more and more attention on using and developing flow control technology in internal and external aviation fluid machinery .Compared with periodic blowing and suction and synthetic jet flow ,the vibration wall flow control method has the advantage of without external air road,lignt in weight and big potential of separation control.What' more,it has the advantage of not destroy of the original flow geometry on the uncontroled condition.This program introduce the proper orthogonal decomposition method,using the Fourier transform of it,establish the unsteady flow analysis method in terms of the vibration wall flow control method.Put the typical vibration wall flow control method in the large diffuser channel,use the large eddy simulation CFD technology to get detailed flow field information under different control parameters.Use the developed proper orthogonal decomposition method to analyse the flow field structure information in different mode,and get the mechanism and inherent law of this flow control method on suppressing subsonic flow separation in diffuser channel.
英文关键词: Proper orthogonal decomposition;Separation flow;Unsteady flow control;Mode analyze;