The Experts below are selected from a list of 9 Experts worldwide ranked by ideXlab platform
H U Liyua - One of the best experts on this subject based on the ideXlab platform.
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an analysis of Acoustic Natural Frequency of boiler combustion system
Power System Engineering, 2005Co-Authors: H U LiyuaAbstract:The Acoustic Natural Frequency of the simplified boiler model is analyzed in order to efficiently eliminate the Acoustically coupled combustion oscillations in the boiler combustion system.The complicated Acoustic modes are studied with examples showing the complexity of the Acoustic Natural frequencies.The general methods to calculate the Natural frequencies of the boiler system are summarized.
Taisuke Tamehira - One of the best experts on this subject based on the ideXlab platform.
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on effects of baffle plate insertion on Acoustic Natural Frequency of duct in boiler tube banks
Transactions of the Japan Society of Mechanical Engineers. C, 2011Co-Authors: Kunihiko Ishihara, Masanori Tsuji, Taisuke TamehiraAbstract:In heat exchangers such as a boiler and a gas heater, the tube bank is set up in a duct. When the Frequency of Karman vortex generated behind tubes becomes close to the Natural Frequency of the duct, the self-sustained tone is generated. As countermeasures of self-sustained tone, the absorbent is used on the duct wall in order to give an Acoustic damping and the dense tube array is adopted not to generate vortexes strongly. As another countermeasure the insertion against baffle plates is often used. The suppression mechanism of this insertion of baffle plates has been considered that the Natural Frequency of the duct increases and the resonance is avoided. However the Natural Frequency of the duct does not increase but decrease a little by inserting baffle plates. That is to say, the effect of inserting baffle plates on the Natural Frequency of the duct has not been clarified yet. Then, the aim of this paper is to clarify the effect of the insertion of baffle plates on the Natural Frequency of the duct by carrying out the experiment and the FEM analysis.
Kunihiko Ishihara - One of the best experts on this subject based on the ideXlab platform.
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on effects of baffle plate insertion on Acoustic Natural Frequency of duct in boiler tube banks
Transactions of the Japan Society of Mechanical Engineers. C, 2011Co-Authors: Kunihiko Ishihara, Masanori Tsuji, Taisuke TamehiraAbstract:In heat exchangers such as a boiler and a gas heater, the tube bank is set up in a duct. When the Frequency of Karman vortex generated behind tubes becomes close to the Natural Frequency of the duct, the self-sustained tone is generated. As countermeasures of self-sustained tone, the absorbent is used on the duct wall in order to give an Acoustic damping and the dense tube array is adopted not to generate vortexes strongly. As another countermeasure the insertion against baffle plates is often used. The suppression mechanism of this insertion of baffle plates has been considered that the Natural Frequency of the duct increases and the resonance is avoided. However the Natural Frequency of the duct does not increase but decrease a little by inserting baffle plates. That is to say, the effect of inserting baffle plates on the Natural Frequency of the duct has not been clarified yet. Then, the aim of this paper is to clarify the effect of the insertion of baffle plates on the Natural Frequency of the duct by carrying out the experiment and the FEM analysis.
Fumio Shimizu - One of the best experts on this subject based on the ideXlab platform.
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Acoustic Natural Frequency and damping ratio of cavity with tube bundle
Transactions of the Japan Society of Mechanical Engineers. C, 1998Co-Authors: Jungo Matuzoe, Hiroki Tanaka, Kazuhiro Tanaka, Fumio ShimizuAbstract:Ducts containing a tube bundle undergo Acoustic resonant vibrations. It is more reasonable to think that the vibration is a kind of mutual excited vibration between fluid dynamic force and sound pressre(1). In this case, it is very important to obtain the damping ratio and the Natural Frequency of sound pressure in the duct. Frequency responses of the sound pressure were calculated by boundary element method. Natural Frequency and damping ratio were obtained by the least error method using the Frequency response curve. Calculated Natural frequencies in closed square box with no tube bundle are in good agreement with theoretical values and the damping ratios are very small. Square box with tube bundle also has very small damping ratio but the Natural Frequency increases with the tube diameter. In the case of box having holes, the Natural Frequency and damping ratio increases with the open rate of the holes. Natural frequencies and damping ratios of the other type of boxes and tube bundles were also calculated and the results are shown in this paper.
Masanori Tsuji - One of the best experts on this subject based on the ideXlab platform.
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on effects of baffle plate insertion on Acoustic Natural Frequency of duct in boiler tube banks
Transactions of the Japan Society of Mechanical Engineers. C, 2011Co-Authors: Kunihiko Ishihara, Masanori Tsuji, Taisuke TamehiraAbstract:In heat exchangers such as a boiler and a gas heater, the tube bank is set up in a duct. When the Frequency of Karman vortex generated behind tubes becomes close to the Natural Frequency of the duct, the self-sustained tone is generated. As countermeasures of self-sustained tone, the absorbent is used on the duct wall in order to give an Acoustic damping and the dense tube array is adopted not to generate vortexes strongly. As another countermeasure the insertion against baffle plates is often used. The suppression mechanism of this insertion of baffle plates has been considered that the Natural Frequency of the duct increases and the resonance is avoided. However the Natural Frequency of the duct does not increase but decrease a little by inserting baffle plates. That is to say, the effect of inserting baffle plates on the Natural Frequency of the duct has not been clarified yet. Then, the aim of this paper is to clarify the effect of the insertion of baffle plates on the Natural Frequency of the duct by carrying out the experiment and the FEM analysis.
