Kunihiko Ishihara
Tokushima Bunri University
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Kunihiko Ishihara.
ASME 2015 Pressure Vessels and Piping Conference | 2015
Kunihiko Ishihara; Masanori Nakaoka
Vortices occur when gas flow passes through a duct with a tube bank of heat exchangers, such as a gas heater and/or a boiler. Very high level noise called a “self-sustained tone” occurs due to the interference of the vortices and the sound field in the duct. In general, baffle plates are used to suppress the self-sustained tone. However, it is difficult to use them effectively, because insertion conditions are vague. Then, perforated plates are used in both sides of the duct walls to suppress the self-sustained tones. Because we thought that the perforated plate might have acoustic damping and resonance mode of the duct perpendicular direction to the flow may be suppressed by its damping effect, when the self-sustained tone occurred. Some experiments were carried out to examine the suppression effect of the perforated plates installed. As a result, the suppression effect appeared in all cases. The purpose of this study is to clarify the effectiveness of the perforated plates for self-sustained tones.© 2015 ASME
ASME 2014 Pressure Vessels and Piping Conference | 2014
Kunihiko Ishihara
Vortices occur when gas flow passes through a duct with a tube bank of heat exchangers, such as a gas heater and/or a boiler. Very high level noise called a “self-sustained tone” occurs due to the interference of the vortices and the sound field in the duct. In general, baffle plates are used to suppress the self-sustained tone. However, it is difficult to use them effectively, because insertion conditions are vague. Then, rubber sheets as flexible walls are installed in both sides of the duct to suppress the self-sustained tone. The reasoning being that the resonant mode of the duct perpendicular to the flow may be suppressed by rubber sheet vibrations when the self-sustained tone occurred. Some experiments were carried out to examine the suppression effect of the installed rubber sheets. As a result, the suppression effect appeared at a certain condition. The purpose of this study is to clarify the effectiveness of the rubber sheet for self-sustained tones.© 2014 ASME
Applied Acoustics | 2017
Masaaki Mori; Takayuki Masumoto; Kunihiko Ishihara
Advances in Applied Acoustics | 2016
Masaaki Mori; Takayuki Masumoto; Kunihiko Ishihara
Transactions of the JSME (in Japanese) | 2018
Kunihiko Ishihara; Tatsuya Nagashima; Tomoharu Taga
The Proceedings of Conference of Kansai Branch | 2018
Kunihiko Ishihara; Satoru Kudo
The Proceedings of Conference of Chugoku-Shikoku Branch | 2018
Kunihiko Ishihara; Serina Yokoi
The Proceedings of Conference of Chugoku-Shikoku Branch | 2018
Satoru Kudo; Kunihiko Ishihara
Transactions of the JSME (in Japanese) | 2017
Kunihiko Ishihara; Satoru Kudo; Takayuki Masumoto; Masaaki Mori
The Proceedings of the Symposium on Environmental Engineering | 2017
Kunihiko Ishihara; Tomoya HAMADASakura; Toshinobu Iwamoto
