Multiple orifice synthetic jet devices are becoming widely utilized for active flow control and jet impingement cooling, due to its mixing performance resulting from the vortices and jet interaction. Therefore, understanding the flow interaction between multiple synthetic jets is crucial in maximizing the potential for many industrial applications. In the present study, an experimental investigation on flow interaction between two synthetic jets generated from a dual-orifice device is performed. The influence of dimensionless orifice spacing (s/D = 1.2, 2.0, and 3.0) and stroke length (L₀/D = 13.7, 18.6, and 27.5) is analyzed at a fixed Reynolds number of Re₀ = 3700. Phase-locked particle image velocimetry (PIV) is used to obtain time- and phase-averaged flow fields. The jet interaction is enhanced as the orifice spacing and stroke length decrease, resulting in shorter distances for the merging and combining points. In addition, the inner vortices between the two jets are deformed and cancelled due to the jet interaction, which leads to the inner and outer vortices merging into a single vortex. The vortex interactions and merging are delayed as the orifice spacing increases, while the advection speed of vortices is increased without change of flow structure as the stroke length increases.

由于节流和射流相互作用产生的混合性能，多孔合成射流设备已被广泛用于主动流量控制和射流冲击冷却。因此，了解多个合成射流之间的流动相互作用对于最大化许多工业应用的潜力至关重要。在本研究中，对双节流装置产生的两个合成射流之间的流动相互作用进行了实验研究。 在固定的Re ₀雷诺数下分析无因次节流孔间距（s / D  = 1.2、2.0和3.0）和行程长度（L ₀ / D = 13.7、18.6和27.5）的影响 =3700。锁相粒子图像测速（PIV）用于获得时间和相位平均的流场。随着孔口间距和行程长度的减小，射流相互作用得到增强，从而导致合并点和合并点的距离更短。另外，两个射流之间的内部涡流由于射流的相互作用而变形和抵消，这导致内部和外部涡流合并成单个涡流。随着孔间距的增加，涡流的相互作用和合并被延迟，而随着冲程长度的增加，涡流的对流速度增加，而流动结构没有变化。