The effect of acoustic streaming produced by sharp-edge structures is used in a variety of microfluidic applications, such as fluid mixing, pumping and particle manipulation. Since most investigations into this effect are experimental, there is a necessity in theoretical studies that could provide a deeper insight into the mechanism of the acoustic streaming and point out ways for optimizing acoustofluidic sharp-edge-based devices. In the present study, an analytical theory is developed that allows one to evaluate the velocity field of acoustic streaming generated at the apex of a wedge-shaped structure. Streamline patterns calculated by the developed theory show that the acoustic streaming is formed by two counterrotating vortices at the wedge apex. In addition to the analytical model, a numerical model is realized using the finite element method. Predictions of both models are described and compared with experimental observations.

尖锐边缘结构产生的声流效应被用于各种微流体应用中，例如流体混合，泵送和颗粒处理。由于大多数对此效应的研究都是实验性的，因此在理论研究中有必要提供一种对声流机理的更深入了解，并指出优化基于声流锐边装置的方法。在本研究中，发展了一种分析理论，该理论使人们能够评估在楔形结构的顶点处产生的声流的速度场。根据已发展的理论计算出的流线型态表明，声流是由楔形顶点处的两个反向旋转涡流形成的。除解析模型外，还使用有限元方法实现了数值模型。