Performance Measurements of Jet Pumps with Multiple Holes

Introduction In order to cancel Gedeon streaming in traveling wave thermoacoustic devices, a jet pump can be used [2, 3]. Due to its asymmetric shape an asymmetry in the minor losses during each acoustic cycle occurs that yields a time-averaged pressure drop across the jet pump. By balancing the time-averaged pressure drop across the jet pump with that which exists across the regenerator of a thermoacoustic device, Gedeon streaming can be suppressed. The current state of the art in jet pump design methodology is based on a quasi-steady approximation [2]. In a recent numerical study we have shown that the applicability of this approximation is limited [4]. Currently, the previous numerical work is extended to the experimental domain to investigate the influence of three-dimensional geometry variations. By “splitting” a jet pump with a single hole into a geometry with multiple parallel holes, the size of the jet pump can be reduced while maintaining the taper angle and the total cross-sectional area. Reducing the size of the jet pump will aid in the design of compact thermoacoustic engines.