FLOW CHARACTERISTICS OF JET HAVING BOTH DIFFUSION ENHANCEMENT AND DIRECTION CONTROL FUNCTIONS

作为扩散控制和方向控制研究的一部分，利用LIF方法对从五角形管道中发出的射流进行了流动显示。通过分析热丝风速仪的速度分布、速度衰减、射流半宽度和湍流强度，对射流扩散进行了研究。此外，为了揭示射流的相干结构，利用半值宽度测点的波动速度分量信息进行连续小波变换。此外，还研究了加入合成射流作为振荡流时射流的特性。结果表明，与没有合成射流的射流相比，有合成射流的射流的扩散得到了促进。并且发现射流被诱导向加入合成射流的一侧。此外，从小波分析结果来看，加入合成射流后，脉动速度的低频分量也相对被唤醒。

As a part of study on the diffusion control and the direction one the flow visualization of the jet flow issuing from the pentagonal duct was performed by the LIF method. And the jet diffusion was investigated by analyzing the velocity distribution, the velocity decay, the jet half width and the turbulent intensity obtained from the data by using the hot wire anemometer. Moreover, in order to reveal the coherent structure of the jet flow, the continuous wavelet transform was conducted using the information of the fluctuating velocity component at the measuring point showing the half value width. Furthermore, the characteristic of the jet with adding the synthetic jet as an oscillating flow was also studied.As a result, it has been clarified that the diffusion of the jet with the synthetic jet is promoted comparing with that of the jet without one. And it has been found that the jet is induced toward the side on which the synthetic jet is added. Moreover from the result of the wavelet analysis, by adding the synthetic jet, it has been also clarified that the low frequency component of the fluctuating velocity is relatively wakened.