Phase Characteristics of Vortex Shedding From Tube Banks on Acoustic Resonance

2017 ◽  
Author(s):  
Hiromitsu Hamakawa ◽  
Satoshi Hino ◽  
Eiichi Nishida ◽  
Eru Kurihara
Keyword(s):  
Vortex Shedding ◽  
Lift Force ◽  
Acoustic Pressure ◽  
Pressure Fluctuations ◽  
Side Wall ◽  
Sound Field ◽  
Peak Level ◽  
Acoustic Resonance ◽  
Coupling Condition ◽  
Tube Banks

This paper investigates the phase characteristics of vortex shedding from tube banks on acoustic resonance. We measured the time variation of a phase between surface pressures related to the lift force on a tube and acoustic pressure on a side wall related to the acoustic particle velocity when acoustic resonance occurred in in-line tube banks. The measured tube was installed at the second rows in the tube banks. As the peak level of spectrum of surface pressure fluctuations increased, the coherence between vortex shedding and wall acoustic pressure in the tube banks also increased. The phase delay between the lift force and acoustic pressure on the side wall was calculated by using a proposed modeling method. In addition, we discuss the verification of the synchronization feedback for a coupling condition between a sound field and wake oscillator.

scholarly journals 3B4 The Relation between Vortex Shedding in In-line Tube Banks and Acoustic Pressure Fluctuation on Acoustic Resonance

2014 ◽  
Vol 2014 (0) ◽  
pp. _3B4-1_-_3B4-2_
Author(s):  
Hiroki MATSUOKA ◽  
Taiki YAMAI ◽  
Hiromitsu HAMAKAWA ◽  
Eiichi NISHIDA ◽  
Eru KURIHARA
Keyword(s):  
Vortex Shedding ◽  
Pressure Fluctuation ◽  
Acoustic Pressure ◽  
Acoustic Resonance ◽  
Tube Banks

Synchronization Characteristics of Vortex Shedding From Tube Banks on Acoustic Resonance

2013 ◽  
Author(s):  
Hiromitsu Hamakawa ◽  
Eiichi Nishida ◽  
Kenta Asakura
Keyword(s):  
Vortex Shedding ◽  
Pressure Fluctuation ◽  
Acoustic Pressure ◽  
Broad Band ◽  
Acoustic Resonance ◽  
Modeling Method ◽  
Acoustic Damping ◽  
Vortex Shedding Frequency ◽  
Shedding Frequency ◽  
Tube Banks

In the present paper the attention is focused on vortex shedding synchronization on acoustic resonance in in-line tube banks which occurred in the two-dimensional model of boiler. And we have examined the verification of proposed modeling method. We measured the characteristics of acoustic resonance, acoustic damping, the pressure fluctuation on the surface of tubes at the nodes of acoustic pressure and the acoustic pressure fluctuation on the side wall of the duct. As the acoustic mode number increased, the acoustic damping ratio decreased. As the tube pitch ratio in the flow direction decreased, the acoustic damping increased for all acoustic modes and the vortex shedding frequency became broad-band. The multiple resonance modes of lower acoustic damping were generated within the broad-band vortex shedding frequency. If the acoustic resonance occurred, the peak level of spectrum of surface pressure fluctuation and the coherence between vortex shedding and wall acoustic pressure in the tube banks also increased. The features of experimental results agree well with those obtained by using the proposed modeling method. We have discussed the characteristics of vortex shedding synchronization by using proposed the modeling method.

Relation between Acoustic Resonance and Vortex Shedding from Tube Banks

2020 ◽  
Vol 2020 (0) ◽  
pp. 606
Author(s):  
Yuudai YAMAGUCHI ◽  
Hayato KOCHYO ◽  
Hiromitsu HAMAKAWA ◽  
Eiichi NISHIDA ◽  
Eru KURIHARA
Keyword(s):  
Vortex Shedding ◽  
Acoustic Resonance ◽  
Tube Banks

Sound Generation by a Centrifugal Pump at Blade Passing Frequency

1998 ◽  
Vol 120 (4) ◽  
pp. 736-743 ◽  
Author(s):  
M. Morgenroth ◽  
D. S. Weaver
Keyword(s):  
Flow Rate ◽  
Acoustic Pressure ◽  
Flow Behavior ◽  
Pressure Fluctuations ◽  
Standing Waves ◽  
Acoustic Resonance ◽  
Piping System ◽  
Hydraulic Pressure ◽  
Pump Speed ◽  
Blade Passing Frequency

This paper reports the results of an experimental study of the pressure pulsations produced by a centrifugal volute pump at its blade passing frequency and their amplification by acoustic resonance in a connected piping system. Detailed measurements were made of the pressure fluctuations in the piping as a function of pump speed and flow rate. A semi-empirical model was used to separate acoustic standing waves from hydraulic pressure fluctuations. The effects of modifying the cut-water geometry were also studied, including the use of flow visualization to observe the flow behavior at the cut-water. The results suggest that the pump may act as an acoustic pressure or velocity source, depending on the flow rate and the cut-water geometry. At conditions of acoustic resonance, the pump acted as an open termination of the piping, i.e., as a node in the acoustic pressure standing waves. Rounding the cut-water had the effect of reducing the amplitude of acoustic resonance, apparently because of the ability of the stagnation point to move and thereby reduce the vorticity generated.

Flow Induced Acoustic Resonance and Vortex Shedding From Staggered Tube Banks

2003 ◽  
Author(s):  
Hiromitsu Hamakawa ◽  
Tohru Fukano ◽  
Eiichi Nishida
Keyword(s):  
Natural Frequency ◽  
Vortex Shedding ◽  
Velocity Fluctuation ◽  
Sound Pressure ◽  
Coherence Function ◽  
Acoustic Resonance ◽  
Velocity Fluctuations ◽  
Commercial Use ◽  
Pitch Ratio ◽  
Tube Banks

In the present paper our attention is focused on the relation between the vortex shedding phenomena and acoustic resonance in tube banks. We measured a spectrum, coherence function, phase delay of velocity fluctuations in the tube banks and sound pressure level at the duct exit. A model of tube banks had used the same pitch ratio as that of a boiler heat exchanger of a commercial use. As a result, we found three types of vortex shedding with different Strouhal number, 0.29, 0.22 and 0.19. The vortex shedding of St = 0.29 and 0.22 were generated inside of the tube banks. On the other hand St = 0.22 and 0.19 were in the wake of the last row of the tube banks. The velocity fluctuation and the periodicity of the vortex shedding were the most intense in the wake of the second row of the tube banks in whole area of the tube banks. When acoustic resonance generated at the natural frequency of the duct, 342.5Hz, at a gap velocity of 39.2m/s, we found two types of vortex shedding with different frequencies, mainly about 342.5Hz (St = 0.29) and 262.5Hz (St = 0.22), inside of the tube banks. The amplitude of velocity fluctuation due to the vortex shedding became large in accordance with the generation of the acoustic resonance which has the fundamental natural frequency of the acoustic resonance in the transverse direction of the duct.

242 Vortex Shedding from In-line Tube Banks on Acoustic Resonance

2008 ◽  
Vol 2008 (0) ◽  
pp. _242-1_-_242-6_
Author(s):  
Hiromitsu HAMAKAWA ◽  
Hiroto MATSUE ◽  
Seiko SUEHIRO ◽  
Eiichi NISHIDA ◽  
Tohru FUKANO
Keyword(s):  
Vortex Shedding ◽  
Acoustic Resonance ◽  
Tube Banks

305 Acoustic Resonance and Vortex Shedding from In-line Tube Banks

2006 ◽  
Vol 2006 (0) ◽  
pp. _305-1_-_305-6_
Author(s):  
Hiromitsu HAMAKAWA ◽  
Ryouji SASYOU ◽  
Eiichi NISHIDA ◽  
Tohru FUKANO
Keyword(s):  
Vortex Shedding ◽  
Acoustic Resonance ◽  
Tube Banks

501 Vortex Shedding and Acoustic Resonance in In-line Tube Banks

2005 ◽  
Vol 2005 (0) ◽  
pp. 157-158
Author(s):  
Ryouji SASYOU ◽  
Hiromitsu HAMAKAWA ◽  
Tohru FUKANO ◽  
Eiichi NISHIDA ◽  
Norihito FUJIMURA ◽  
...  
Keyword(s):  
Vortex Shedding ◽  
Acoustic Resonance ◽  
Tube Banks

scholarly journals Acoustic Resonance and Vortex Shedding from Tube Banks of Boiler Plant

2008 ◽  
Vol 74 (747) ◽  
pp. 2336-2343
Author(s):  
Hiromitsu HAMAKAWA ◽  
Hiroto MATSUE ◽  
Ryouji SASYOU ◽  
Eiichi NISHIDA ◽  
Tohru FUKANO
Keyword(s):  
Vortex Shedding ◽  
Acoustic Resonance ◽  
Boiler Plant ◽  
Tube Banks

scholarly journals 849 Modeling Method of Vortex Shedding Synchronization in Heat Exchanger Tube Banks on Acoustic Resonance

2012 ◽  
Vol 2012 (0) ◽  
pp. _849-1_-_849-8_
Author(s):  
Hiromitsu HAMAKAWA ◽  
Eiichi NISHIDA ◽  
Tatsuaki NAKAMURA ◽  
Kenta ASAKURA ◽  
Eru KURIHARA
Keyword(s):  
Heat Exchanger ◽  
Vortex Shedding ◽  
Acoustic Resonance ◽  
Modeling Method ◽  
Heat Exchanger Tube ◽  
Tube Banks ◽  
Exchanger Tube
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