Nonlinear Analysis of Rotating Stall : 1st Report, Two-Dimensional Isolated Blade Row

浩之, 高田; 三郎, 永野

doi:10.1299/kikai1938.37.687

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“…Interference between cascades is thought to be important in determining the number of stall cells; however, this is an assumption as stalling is a nonlinear phenomenon and is also dependent on cascade geometry and dimensions. Takata and Nagano [22] stepped away from linear theory and developed a theory that considers constant amplitude or nonlinear cascade properties that determine the amplitude and nonlinear equations of motion with finite fluctuation. As a result, various properties of rotating stall including number of stall cells; magnitude and waveform of fluctuation; rotating speed; and the mechanism behind these became clear.…”

Section: History Of Research and Evaluationmentioning

confidence: 99%

Vibrations in Rotary Machines

2014

Flow-Induced Vibrations

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Section: History Of Research and Evaluationmentioning

confidence: 99%

Vibrations in Rotary Machines

2014

Flow-Induced Vibrations

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Study on countermeasure of infrasonic sound caused by rotating stall

Ishihara

Nagashima

Taga

2018

Transactions of the JSME (In Japanese)

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An infrasound sometimes occurs in an industrial field like a paper factory and it becomes a cause of complaints from neighborhood resident of the factory. The infrasound has acoustic features of a long wave length and little effects of conventional countermeasures such as an acoustic absorbent and sound insulator. Therefore once it happens, it has been difficult to do countermeasure. This paper describes that the rotating stall occurred in a fan (IDF: Induced Fan) becomes the cause of the infrasound generated from the EP (Electric dust collector) set in the factory. This is a very scarce and interesting phenomenon. So it is considered of value to describe the event. A lot of measurements were carried out to clarify the cause of this event. As a result, the cause of the infrasound is the resonance of the EP and the cause of the resonance is the rotating stall of the fan. Therefore the countermeasure is to exchange a new fan with P-Q characteristics of a large gradient (Q p   /). As a result, the infrasound disappeared.

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Nonlinear Analysis of Rotating Stall : 1st Report, Two-Dimensional Isolated Blade Row

Cited by 2 publications

References 0 publications

Vibrations in Rotary Machines

Vibrations in Rotary Machines

Study on countermeasure of infrasonic sound caused by rotating stall

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