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Research Papers: Fluid-Structure Interaction

Aeroacoustic Source Distribution in an Inline Tube Array With a Pitch Ratio of 3

[+] Author and Article Information
Craig Meskell

Department of Mechanical Engineering,
Trinity College,
Dublin, Ireland
e-mail: cmeskell@tcd.ie

Shane L. Finnegan

Department of Mechanical Engineering,
Trinity College,
Dublin, Ireland

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received September 13, 2013; final manuscript received January 21, 2014; published online August 19, 2014. Assoc. Editor: Samir Ziada.

J. Pressure Vessel Technol 136(5), 051310 (Aug 19, 2014) (6 pages) Paper No: PVT-13-1162; doi: 10.1115/1.4026581 History: Received September 13, 2013; Revised January 21, 2014

The flow induced acoustics in an inline tube bank (P/d = 3) subject to cross flow, indicative of a generic heat exchanger geometry, are examined over a range of flow velocities using particle image velocimetry (PIV) coupled with acoustic modal analysis using finite element analysis (FEA). The objective is twofold: to determine if the method originally developed for tandem cylinders is applicable to more geometrically complex configurations, with more restricted optical access; and hence to investigate the spatial distribution of acoustic sources within the tube array. The spatial and temporal aeroacoustic source distribution has been successfully obtained experimentally for the case of Strouhal acoustic coincidence (i.e., fa = fv). It is found that the acoustic sources are most intense behind the first row due to the spatial compactness of the vortices. However, a strong negative source (i.e., a sink) is also present in this location, so that the net contribution of the first row wake is small. In subsequent rows, the sources are weaker and more dispersed, but the sink is reduced dramatically. The result is that after the first row the remaining rows of the array contributes energy to the acoustic field. It is noted that, for the coincidence case in the tube bundle studied here, the spatial distribution of sources in the region around the first and second row is similar to the precoincidence regime found for tandem cylinders. This apparent contradiction requires further investigation. Nonetheless, it is concluded that the method of combining PIV with FEA to determine the source distribution can be applied to more complex geometries than previously reported.

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Figures

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Fig. 1

Schematic of experimental geometry. Tube array geometry is P/d = L/d = 3.0. Tube diameter, d = 13 mm. Position of microphone and hotwire are indicated by M1 and HW2, respectively.

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Fig. 2

Schematic of the nine overlapping interrogation zones used for PIV measurements

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Fig. 3

Aeroacoustic behavior of the tube array at various flow velocities measured by microphone M1 and hotwire HW2

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Fig. 4

The full field hydrodynamic vorticity and acoustic power for different phases of the acoustic wave cycle at acoustic-Strouhal coincidence, fa = 311 Hz, (Ua/V∞)=0.18

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Fig. 6

Comparison of normalized acoustic energy per cycle E as a function distance from the first upstream cylinder: Inline tube bundle (P/d = 3), current study; two tandem cylinders during preconcidence resonance (P/d = 2.5) from Ref. [8]

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Fig. 5

Total acoustic energy per cycle generated at acoustic-Strouhal coincidence

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