The aerodynamic noise emitted by a subsonic flow of dry air through an orifice plate is estimated in terms of internal sound power level and external sound pressure level (SPL) by application of the methodology described in the international standard IEC 60534-8-3. A shortcoming of the standard in defining the efficiency of the transformation of the mechanical energy of the flow into acoustic energy is discussed. Experimental evidence of the matter is also described. An alternative model employing the resolution of Reynolds Averaged Navier-Stokes equations (RANS) by means of Computational Fluid Dynamics (CFD) techniques for the calculation of the acoustic power generated by the turbulent flow through the orifice plate is applied so as to overcome the issue.

通过使用国际标准IEC 60534-8-3中所述的方法，以内部声功率级和外部声压级（SPL）估算通过孔板的亚音速干燥空气流产生的空气动力噪声。讨论了在定义将流的机械能转换为声能的效率方面的标准的缺陷。还描述了此事的实验证据。为了解决这个问题，提出了一种替代模型，该模型利用雷诺平均Navier-Stokes方程（RANS）的分辨率，借助计算流体动力学（CFD）技术来计算通过孔板的湍流所产生的声功率。 。