Noise Characteristics in Partial Discharge of Centrifugal Fans : 1st Report, Low Frequency Noise Due to the Rotating Stall

昭次, 鈴木; 義雄, 鵜飼; 英臣, 原田

doi:10.1299/kikai1938.43.3020

Cited by 3 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The spectrum information which was acquired by two microphones allows to detect the development of rotating stall in the vaneless diffuser and also to analyze its characteristics [12,25,26], as shown in figure 2, where ψ was defined as:…”

Section: Characteristics Of Rotating Stallmentioning

confidence: 99%

“…For two dimensional analysis, it was suggested the 2D core flow instability might be responsible for rotating stall. Generally, it is admitted that the effect of [11], Dazin et al [1,12], Dodds and Vahdati [13,14], Ferrara et al [15,16], Abdelhamid et al [17][18][19], Abidogun [20], Nishida and Kobayshi [21,22], Cellai et al [23], Tsurusaki et al [24], Suzuki et al [25], Caignaert et al [26]. The main research contents of these experimental studies were focused on several aspects: i.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Study and Theoretical Analysis of the Rotating Stall in a Vaneless Diffuser of Radial Flow Pump

Heng

Ouarzazi

2016

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

This paper reports an experimental and theoretical study of rotating stall in a vaneless diffuser which is coupled with a radial impeller. The experiments were conducted at 22 flow rates for two rotating speed: 1200rpm and 1800rpm. The measurements have consisted of: i/ unsteady pressure measurements delivered by two microphones flush mounted on the vaneless diffuser, ii/ 9 steady pressure taps mounted in one radial line on the diffuser to measure the pressure recovery in the vaneless diffuser. The stability of each stall mode was also studied by a 2D linear analysis; and the theoretical prediction was compared to experimental observations. The capabilities and limits of such an approach to predict the development of rotating stall have been evaluated. A non-dimensional analysis of the pressure losses at outlet was conducted to evaluate the effect of the instability development on the performance of the diffuser. It has shown that the arising of rotating stall has a positive effect on the diffuser performance.

show abstract

Section: Characteristics Of Rotating Stallmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Study and Theoretical Analysis of the Rotating Stall in a Vaneless Diffuser of Radial Flow Pump

Heng

Ouarzazi

2016

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

show abstract

A study of rotating stall in a vaneless diffuser of radial flow pump

Heng¹,

Ouarzazi²,

2018

Journal of Hydraulic Research

View full text Add to dashboard Cite

Rotating stall in a vaneless diffuser of radial flow pump is studied. The measurements have consisted of: i/ unsteady pressure measurements delivered by two microphones, ii/ 9 steady pressure taps mounted in one radial line to measure the pressure recovery in the vaneless diffuser. Spectrum analysis was used to identify and characterize rotating stall. An assumption was made to estimate the losses in the vaneless diffuser to evaluate the effect of the instability development on its performance. The result has shown that the arising of rotating stall has a positive effect on the diffuser performance. Two possible reasons are proposed: 1. A blockage in the diffuser due to the unstable cells which shortens the streamlines and decreased the friction losses along the vaneless diffuser. 2. The topology of rotating stall cells results in the convection of fluid coming from outside part of the pump model to the vaneless diffuser.

show abstract

Experiences with Flow-Induced Vibration and Low Frequency Noise Due to Rotating Stall of Centrifugal Fan

Okada¹

1987

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

In recently constructed electric power plants, the forced draft fan (FDF), induced draft fan (IDF) and boost up fan (BUF) centrifugal fans and duct-systems have become larger in capacity and limited in space every year. As a centrifugal fan is enlarged, the diameter of the impeller is enlarged and its rotating speed is lowered. Therefore, there is an increasing tendency to generate a low frequency noise.5 In the case of an IDF or BUF, the rotating stall of the centrifugal fan frequently causes low frequency noise, since the inlet flow is often throttled during operation. If the hydrodynamic and acoustical characteristics are insufficient, a strong flow-induced vibration with low frequency noise is generated in the fan-duct system, and not only are problems caused in terms of structural strength, but also physical and physiological problems are induced due to low frequency noise.

show abstract

Noise Characteristics in Partial Discharge of Centrifugal Fans : 1st Report, Low Frequency Noise Due to the Rotating Stall

Cited by 3 publications

References 0 publications

Experimental Study and Theoretical Analysis of the Rotating Stall in a Vaneless Diffuser of Radial Flow Pump

Experimental Study and Theoretical Analysis of the Rotating Stall in a Vaneless Diffuser of Radial Flow Pump

A study of rotating stall in a vaneless diffuser of radial flow pump

Experiences with Flow-Induced Vibration and Low Frequency Noise Due to Rotating Stall of Centrifugal Fan

Contact Info

Product

Resources

About