scholarly journals Noise Reduction in Butterfly Valve Cavitation by Semicircular Fins and Visualization of Cavitation Flow

10.5772/38760 ◽  
2012 ◽  
Author(s):  
Kazuhiko Ogawa
Keyword(s):  
Noise Reduction ◽  
Butterfly Valve ◽  
Cavitation Flow

1002 Cavitation Reduction around a Butterfly Valve : Noise Reduction by Flow Velocity Profile

2010 ◽  
Vol 2010.85 (0) ◽  
pp. _10-2_
Author(s):  
Kazuhiko OGAWA ◽  
Tomonao MIYAMAE ◽  
Takehiro KUSUMOTO ◽  
Toshimitsu FUTIMOTO ◽  
Yousuke MIYAI
Keyword(s):  
Velocity Profile ◽  
Noise Reduction ◽  
Flow Velocity ◽  
Butterfly Valve ◽  
Flow Velocity Profile

1021 A study on cavitation around a butterfly valve : Noise Reduction by Riblets

2006 ◽  
Vol 2006.81 (0) ◽  
pp. _10-21_
Author(s):  
Kazuhiko OGAWA ◽  
Tomoya UCHIDA ◽  
Kentarou YAMASHITA ◽  
Daisuke KINOSITA
Keyword(s):  
Noise Reduction ◽  
Butterfly Valve

1014 Cavitation Reduction around a Butterfly Valve : Noise Reduction by Fins

2007 ◽  
Vol 2007.82 (0) ◽  
pp. _10-14_
Author(s):  
Kazuhiko OGAWA ◽  
Takuma OTANI ◽  
Takasi TUKUDA ◽  
Kousuke NAKANO
Keyword(s):  
Noise Reduction ◽  
Butterfly Valve

Cavitation Noise Reduction Around a Butterfly Valve by Semicircular Fins

2007 ◽  
Author(s):  
K. Ogawa
Keyword(s):  
Noise Reduction ◽  
Experimental Results ◽  
Simple Construction ◽  
Butterfly Valve ◽  
Cavitation Noise ◽  
Valve Body

Butterfly valves are widely used in industry because of their compactness and simple construction. Many kinds of valves have been proposed to prevent cavitation. However, those valves are fairly expensive and the structures of the valve are complicated. In this paper, the attachment of fins to the valve body is proposed to reduce cavitation noise. The cavitation around the butterfly valve occurs because of the interference of the flow from the nozzle side and the flow from the orifice side. To avoid this interference, semicircular fins were attached to the valve body. From the experimental results, it was confirmed that the attachment of the fins was very effective in reducing the cavitation noise.

Hydrodynamic characteristics of a butterfly-valve and the noise reduction of cavitation

2003 ◽  
Vol 2003.78 (0) ◽  
pp. _9-53_-_9-54_
Author(s):  
Kazuhiko OGAWA ◽  
Akiyuki OHNISHI ◽  
Yasunobu TAKAKI ◽  
Satoshi KONDO ◽  
Takao SAKURAI ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Hydrodynamic Characteristics ◽  
Butterfly Valve

Satisfaction With Noise Reduction Circuits

1993 ◽  
Vol 2 (1) ◽  
pp. 51-53 ◽  
Author(s):  
Ruth A. Bentler
Keyword(s):  
Noise Reduction

КОНЦЕПЦІЯ СТВОРЕННЯ СИЛОВОЇ УСТАНОВКИ СІМЕЙСТВА РЕГІОНАЛЬНИХ ПАСАЖИРСЬКИХ ЛІТАКІВ АН-148/АН-158

2019 ◽  
pp. 50-63
Author(s):  
О. Д. Донець ◽  
В. П. Іщук
Keyword(s):  
Power Plant ◽  
Noise Reduction ◽  
Fuel Consumption ◽  
Electronic System ◽  
Electronic Control ◽  
Level Of Automation ◽  
Auxiliary Power ◽  
Power Plant Control ◽  
Technical Status ◽  
Air Intake

The basic results of calculation and research works carried out in the process of creation of power unit of regional passenger airplanes’ family are given. The design features of the propulsion engines and engine of the auxiliary power plant are described. The aforementioned propulsion system includes propulsion engines D-436-148 and engine AI-450-MS of auxiliary power plant. In order to comply with the requirements of Section 4 of the ICAO standard (noise reduction of the aircraft in site), in part of ensuring the noise reduction of engines, when creating the power plant of the An-148/An-158 aircraft family, a single- and double-layer acoustic filler was used in the structure of the engine nacelle and air intake. The use of electronic system for automatic control of propulsion engines such as FADEC and its integration into the digital airborne aircraft complex ensured the operation of engines, included in the power plant provided with high specific fuel consumption, as well as increased the level of automation of the power plant control and monitoring, and ensured aircraft automation landing in ICAO category 3A. In addition, the use of the aforementioned electronic system, allowed to operate the power plant of the aircraft in accordance with technical status. The use of the AI-450-MS auxiliary power plant with an electronic control system such as FADEC, and the drive of the service compressor from a free turbine, eliminated the effect of changes in power and air takeoff, on the deviation of the engine from optimal mode, which also minimized the fuel consumption. The use of fuel metering system TIS-158, allowed to ensure control of its condition and assemblies, without the use of auxiliary devices, built-in control means. In the fire protection system, the use of the electronic control and monitor unit, as well as the use of digital serial code for the exchange of information between the elements of the system and the aircraft systems, has reduced the number of connections, which increased the reliability of the system and reduced its weight characteristics.

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