Oosterhuis Joris P, Bühler Simon, Wilcox Douglas, van der Meer Theo H
Department of Thermal Engineering, University of Twente, Enschede, The Netherlands.
Chart Incorporated, Troy, New York 12180, USA.
J Acoust Soc Am. 2015 Oct;138(4):1991-2002. doi: 10.1121/1.4929937.
The oscillatory flow through tapered cylindrical tube sections (jet pumps) is characterized by a numerical parameter study. The shape of a jet pump results in asymmetric hydrodynamic end effects which cause a time-averaged pressure drop to occur under oscillatory flow conditions. Hence, jet pumps are used as streaming suppressors in closed-loop thermoacoustic devices. A two-dimensional axisymmetric computational fluid dynamics model is used to calculate the performance of a large number of conical jet pump geometries in terms of time-averaged pressure drop and acoustic power dissipation. The investigated geometrical parameters include the jet pump length, taper angle, waist diameter, and waist curvature. In correspondence with previous work, four flow regimes are observed which characterize the jet pump performance and dimensionless parameters are introduced to scale the performance of the various jet pump geometries. The simulation results are compared to an existing quasi-steady theory and it is shown that this theory is only applicable in a small operation region. Based on the scaling parameters, an optimum operation region is defined and design guidelines are proposed which can be directly used for future jet pump design.
通过锥形圆柱管段（喷射泵）的振荡流通过数值参数研究进行表征。喷射泵的形状导致不对称的流体动力端效应，这使得在振荡流条件下会出现时间平均压降。因此，喷射泵在闭环热声装置中用作流动抑制器。使用二维轴对称计算流体动力学模型，根据时间平均压降和声功率耗散来计算大量锥形喷射泵几何形状的性能。研究的几何参数包括喷射泵长度、锥角、腰部直径和腰部曲率。与先前的工作一致，观察到四种流动状态，这些状态表征了喷射泵的性能，并引入了无量纲参数来缩放各种喷射泵几何形状的性能。将模拟结果与现有的准稳态理论进行比较，结果表明该理论仅适用于较小的运行区域。基于缩放参数，定义了最佳运行区域并提出了设计准则，这些准则可直接用于未来的喷射泵设计。
