基于智能蒙皮的可压缩湍流主动减阻控制研究

项目名称： 基于智能蒙皮的可压缩湍流主动减阻控制研究

项目编号： No.11302250

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 孙振生

作者单位： 中国人民解放军第二炮兵工程大学

项目金额： 26万元

中文摘要： 飞行器运动过程中，周围湍流边界层产生的摩擦阻力在总阻力中占有很大的比重。有效地控制湍流边界层的摩擦阻力可大大提高飞行器的运行效率，节约运行成本。本项目拟采用直接数值模拟方法，利用智能蒙皮和主动控制技术对可压缩湍流的减阻问题进行研究。主要研究内容如下：（1）可压缩壁湍流的直接数值模拟方法：通过激波捕捉格式的谱特性优化，使得格式既能够模拟湍流的高波数成分，又能够很好地捕捉激波。（2）基于壁面可测信号的主动减阻控制方案：首先建立起壁面可测信号与可压缩壁湍流近壁相干结构的关系，然后设计控制方案，利用壁面可测信号抑制近壁湍流相干结构，达到减阻的目的。（3）减阻的机理：通过湍流统计量，近壁相干结构的动力学过程和湍动能的输运等分析主动控制对可压缩湍流近壁区相干结构的影响，进行减阻机理的研究。项目旨在为飞行器提供能够工程实用的主动减阻控制方案，并通过减阻机理的分析，加深对可压缩湍流的认识。

中文关键词： 高精度格式；高分辨率格式；可压缩湍流；主动控制；减阻

英文摘要： Skin-friction caused by turbulence constitutes a large fraction of the total drag when the aircrafts flying and any reduction of turbulence friction entails substantial savings of the operational cost as well as obviously increasing the flying efficiency. Therefore, direct numerical simulations are carried out in the present project to assess the potential drag reduction of compressible wall turbulence by using smart wall approach and active control methodology. The main contents of the project consist of of following aspects. (1) Numerical methods which are suitable for the direct numerical simulation of compressible wall turbulence are developed. A novel approach is employed to optimize the spectral properties of the shock-capturing schemes to make them have good spectral properties as well as robust discontinuity-capturing capabilities. (2) The active control approaches based on the measurable quantities are devised. The relationship between the measurable quantities and the near-wall coherent structures is firstly established. Then the active control methods are designed to supress the near-wall coherent stuctures aiming at skin-friction reduction. (3)The fundamental mechanisms of the drag reduction are investigated.The effects of the active control on the compressible wall turbulence are studied by employi

英文关键词： High order scheme；High resolution scheme；Compressible turbulence；Active control；Drag reduction