Abstract
The planar jet has been proposed to reduce the flow-induced noise. However, the self-noise emission from a single planar jet is a limiting factor on the performance based characteristics of this technology. Therefore, this research paper reports an alternative dual planar jets geometry in an attempt to minimize the self-noise of the single planar jet, thus, further enhancing total noise reduction in the application. Tandem cylinders are considered as the generic bluff body, which represents the source of flow-induced noise. Tests are conducted to capture noise reduction effects when using a single planar jet geometry. Subsequently, two different configurations of the dual planar jets geometry were tested in comparison. It is observed that the dual jets geometry achieves more noise reduction when compared to the single jet. Moreover, conclusions are made on the most efficient configuration in the dual jets geometry.
Highlights
Flow-induced noise potentially causes disturbance and annoyance within various engineering applications.[1,2,3,4,5,6] In particular, airframe noise, which is generated through the interaction between the turbulent flow and the solid bodies on the aircraft, has been identified as an “aircraft noise barrier” since the early seventies.[7]
Considering the interdisciplinary challenge between fluid mechanics and acoustics arising from this noise effect, airframe noise reduction has become a major concern for stakeholders within the aviation sector, acoustic experts, fluid mechanics engineers and researchers
Tandem cylinders were utilized as the bluff body and generic noise generating source, supported by two blocks on the platform
Summary
Flow-induced noise potentially causes disturbance and annoyance within various engineering applications.[1,2,3,4,5,6] In particular, airframe noise, which is generated through the interaction between the turbulent flow and the solid bodies on the aircraft, has been identified as an “aircraft noise barrier” since the early seventies.[7]. The fundamental concept is to install an upstream planar jet to shelter the noise generating source, i.e.the bluff body, thereby deflecting the incoming flow. Due to the shelter effect, the flow speed originally impinging on the bluff body can be significantly reduced, a reduction of the flow-induced noise can be achieved. Once there is a crossflow, the jet interacts with this, and jet noise emission increases to a large extent when compared to the quiescent flow.[10] In this paper, a proof of concept study is reported, where the geometry of dual planar jets is proposed to suppress self-noise and achieve greater flow-induced noise reduction
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