Fundamental Study of Aerodynamic Drag Reduction for Vehicle with Feedback Flow Control
Fundamental Study of Aerodynamic Drag Reduction for Vehicle with Feedback Flow Control
复制标题
反馈流量控制飞行器气动减阻基础研究
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
A. Shirai
中科院分区：
文献类型：
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作者：
Keisuke Nisugi;T. Hayase;A. Shirai
本文对带反馈流动控制的飞行器进行了气动减阻的基础研究。作为第一步，对简化的车辆模型的绕流进行二维计算。研究了非定常阻力与模型涡脱落的关系。控制流喷嘴的位置是这样确定的，即控制流对阻力的影响最有效。设计本反馈控制的关键是输出信号的定义。基于阻力产生的物理考虑，在前挡风玻璃附近的有限区域内改变输出速度测量的位置。一个系统的计算表明，在一个小的区域内定义的输出信号的结果在一个显着的阻力减少20%的情况下，没有控制。本反馈流动控制一般可应用于非流线体的减阻，对于该非流线体，阻力是在基本上二维旋涡脱落的相同机制下产生的。
The present paper deals with a fundamental study of aerodynamic drag reduction for a vehicle with a feedback flow control. As the first step, two-dimensional calculation was performed for a flow around a simplified vehicle model. The mechanism of unsteady drag was investigated in relation to the vortex shedding from the model. The location of the control flow nozzle was so determined that the control flow influences the drag most effectively. The key in designing the present feedback control is the definition of the output signal. Based on the physical consideration of the drag generation, the location of the output velocity measurement was changed within a limited region near the front windshield. A systematic calculation revealed that the output signal defined in a small region results in a significant drag reduction of 20% with respect to the case without control. The present feedback flow control is generally applicable to the drag reduction of the bluff body for which the drag is generated under the same mechanism of essentially two-dimensional vortex shedding.