The interaction of oblique water waves with a land-fixed Oscillating Water Column (OWC) type wave energy converter is examined. Two-dimensional linear wave theory is used to formulate the mathematical problem. The matched eigenfunction expansion method (EEM) using dual series relations and the Boundary Element Method (BEM) with quadratic elements are utilized to solve the associated boundary value problem (BVP). The novelty of the present work lies on addressing the influence of oblique water waves on the OWC efficiency and the use of dual series relations to solve this type of BVP. Variations of the hydrodynamic efficiency with the wave angle of incidence, and with the chamber length and front barrier draft to water depth ratios are discussed. Both analytical and numerical results were found to be in good agreement. Findings revealed that by increasing the angle of incidence, a broader hydrodynamic efficiency band and a higher wave frequency at which resonance occurs are both obtained. This aspect may offer benefits to wave power extraction in real sea conditions for fixed OWC devices. Finally, cases published in the specialized literature were recovered and very good agreement was achieved.

研究了倾斜水波与陆地固定振荡水柱（OWC）型波能转换器之间的相互作用。使用二维线性波理论来阐述数学问题。利用对偶级数关系的匹配特征函数展开法（EEM）和具有二次元的边界元方法（BEM）来解决相关的边值问题（BVP）。当前工作的新颖性在于解决倾斜水波对OWC效率的影响以及使用双序列关系来解决这种类型的BVP。讨论了水动力效率随入射波角，腔室长度和前屏障吃水深度与水深之比的变化。分析和数值结果均发现吻合良好。结果表明，通过增加入射角，可以获得更宽的流体动力学效率带和更高的发生共振的波频率。这方面可以为固定OWC设备的实际海况中的波功率提取提供好处。最后，检索了专业文献中发表的案例，并达成了很好的共识。