Experimental determination of the tonal noise sources in a centrifugal fan

Velarde-Suáréz, Sandra; Ballesteros-Tajadura, Rafael; Hurtado-Cruz, Juan Pablo; Santolaria-Morros, Carlos

doi:10.1016/j.jsv.2006.01.049

Cited by 61 publications

(12 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The overall SPLs are the lowest at the BEPs and increase rapidly when the flow rates deviate from the BEP. This result agrees with the findings of Velarde‐Suárez et al 11,12 that the lowest SPL corresponds to the BEP for a forward‐ and a backward‐curved fan. Figure 6b shows that the overall SPLs of fans #VNL–#R1h8 at off‐design flow rate increase relatively slowly.…”

Section: Resultssupporting

confidence: 93%

The Effect of Half Vane Diffuser on the Noise Generated from a Centrifugal Fan

Zhang

Gong

Fan

et al. 2010

Experimental Techniques

View full text Add to dashboard Cite

In this paper an experimental study is conducted to investigate the influence of a half vane diffuser on the noise behavior of a centrifugal fan, used in a vacuum cleaner. The diffuser vane height h/b is varied as follows: 0 (vaneless), 0.2, 0.4, 0.6, 0.8 and 1.0 (full vane) at two diffuser inlet radii R3/R2 = 1.03 and 1.07. The experiments were carried out on a high speed centrifugal fan. The sound pressure level (SPL) and pressure rise of the centrifugal fan were measured in a semi‐anechoic chamber. The fan flow coefficient was in the range of 0.02 to 0.14, and the rotational speed of the impeller varied from 20,000 to 35,000 rpm. The experimental result shows that by using a half vane diffuser, the sound pressure levels are respectively reduced by 5.5 dB(A) and 3.5 dB(A) at R3/R2 = 1.03 and 1.07. Meanwhile, the half vane diffuser improves the fan performance and extends the flow range. The optimal value of the half vane height is about 0.6 times of the diffuser width.

show abstract

Section: Resultssupporting

confidence: 93%

The Effect of Half Vane Diffuser on the Noise Generated from a Centrifugal Fan

Zhang

Gong

Fan

et al. 2010

Experimental Techniques

View full text Add to dashboard Cite

show abstract

“…Jeon 25 calculated the effects of design parameters on the performance and noise of a centrifugal fan. Few researchers 26–28 have studied the tonal noise sources in centrifugal fans by experimental test.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on the performance and noise characteristics of a forward-curved fan with the stepped tongue

Yang

Xu³

et al. 2019

Measurement and Control

View full text Add to dashboard Cite

This work presents an experimental study to investigate the influence of step volute tongue on aerodynamic performance and aeroacoustic behavior of a forward-curved fan. The noise characteristics are analyzed and controlled based on measured acoustic pressures for various stepped tongues; meanwhile, fan performance is detected and optimized. The design parameters of the stepped tongues are presented to provide significant physical insight into increasing the static pressure as well as the efficiency of static pressure and reducing the fan noise generation. The comparison of the test results indicates that the improved static pressure and its efficiency of the HLHL model have increased by 15.67 Pa and 3.57%, respectively, by comparing with those of the baseline model. At 740 m3/h, a great correlation between different arrays of stepped tongue and the noise generation was observed. The tonal noise level of the HLHL model is a better optimization scheme because it decreases as much as 1.2 dB for the noise generation of forward-curved fan. In particular, it is found that some stepped tongues of the volute tongue achieved the goal of reducing noise generation and improving the performance of fan by experimental measurement at the same time.

show abstract

“…Neise and Koopmann investigated experimentally a method by which an acoustic resonator can be used to reduce at source the aerodynamic noise generated by turbo machinery [21]. Velarde-Suárez et al carried out an experimental study about the aerodynamic tonal noise sources in a centrifugal fan with backward curved blades [22]. Filleul made measurements of noise from fans designed for military vehicle cooling installations and two fan rotors in particular have been run under varied test conditions [23].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Broadband Noise Sources of an Axial Fan under Rotating Stall Conditions

Zhang

Wang

2014

Advances in Mechanical Engineering

View full text Add to dashboard Cite

Study on the influence of rotating stall on the aerodynamic noise of axial fan has important value to warn of the occurrence of stall through monitoring the noise variations. The present work is to analyze the aerodynamic noise before and after the phenomenon of rotating stall by solving Navier-Stokes equations, coupled with the throttle condition and the broadband noise sources model. The impeller exit rotational Mach number and rotational Reynolds number are separately 0.407 and 8.332 × 106 . The results show that the aerodynamic noise source of the fan is mainly the rotation noise under the design condition. The vortex noise accounts for the major part of fan noise after the occurrence of stall, and the maximum acoustic power level of the fan appears in the rotor domains. In the evolution process from the stall inception to the stall cell, the high noise regions of the rotor develop along the radial, circumferential, and axial directions, and the area occupied by high noise regions increases from 33% to 46% impeller channels area. On rotating stall condition, the high noise regions occupying about 46% impeller channels area propagate with the stall cell along the circumferential direction at a half of rotor speed.

show abstract

Experimental determination of the tonal noise sources in a centrifugal fan

Cited by 61 publications

References 8 publications

The Effect of Half Vane Diffuser on the Noise Generated from a Centrifugal Fan

The Effect of Half Vane Diffuser on the Noise Generated from a Centrifugal Fan

Experimental investigations on the performance and noise characteristics of a forward-curved fan with the stepped tongue

Simulation of Broadband Noise Sources of an Axial Fan under Rotating Stall Conditions

Contact Info

Product

Resources

About