Over the last decade, several studies have investigated synthetic jets. However, there are still many clarifications needed, including details of the structure and Coanda effect of synthetic jets. The present study clarifies some fundamental flow characteristics of free synthetic jets and synthetic jets near a rigid boundary by conducting an experiment and numerical simulations. As the main results, it is found that the velocity distribution of free synthetic jets depends on K = Re/S~(2) (the ratio of the Reynolds number to the square of the Stokes number) and can be identified by the maximum velocity at the centerline and the jet half-width. In addition, it is confirmed that the flow characteristics of the synthetic jet near a rigid boundary and the re-attachment length of the synthetic jet are determined not only by H_(1)/b_(0) (normalized step height) but also K .
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机译：在过去的十年中，几项研究对合成射流进行了研究。但是，仍然需要进行许多澄清，包括合成射流的结构和柯恩达效应的细节。本研究通过进行实验和数值模拟，阐明了自由合成射流和刚性边界附近合成射流的一些基本流动特性。作为主要结果，发现自由合成射流的速度分布取决于 K = Re / S〜（2）（雷诺数与斯托克斯数的平方之比），可以通过以下公式确定：中心线处的最大速度和射流半宽度。另外，已经证实，不仅在 H_（1）/ b_（0）（归一化台阶高度）上，还确定了在刚性边界附近的合成射流的流动特性和合成射流的重新附着长度。还有 K。
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