D型体主被动结合流动控制研究

Flow Control of Active and Passive Combination of D-Shaped Bluff Body

摘要:

以简化准三维模型D型钝体为研究对象，通过数值仿真手段，利用零质量合成射流器理论进行了D型体主动流动控制和主被动结合的流体控制研究发现，在尾部分离点进行射流控制时，高频射流有助于钝体减阻，减阻效果可以达到1.78%。主被动结合的锯齿和射流加强了尾迹三维流动结构，破坏了准三维模型的展向流动结构，使得减阻效果较好。采用主被动结合控制的射流为低频和高频时减阻效果为20.86%和21.20%。

关键词:D型体;气动减阻;主动控制;合成射流

Abstract:

To explore the flow field of the vehicle and the strategies of drag reduction, this paper focuses mainly on numerical simulation of the flow structures of D-shaped bluff body. Based on the theory of zero mass synthetic jet, it studies the active flow control and the active-passive flow control of D-shaped bluff body. It is found that high frequency jet can reduce the drag of D-shaped bluff body, and the maximum drag reduction can reach 1.78%. The combination of active and passive splitter plates with tabs and synthetic jet strengthens the three-dimensional flow structure of wake, impedes the extended flow structure in the wake of quasi-three-dimensional model, and makes the drag reduction perform better. The drag reduction effect is 20.86% at low frequencies and 21.20% at high frequencies.

Key words:D-shaped bluff body;drag reduction;active control;synthetic jet