B22 Noise Characteristics of Centrifugal Blower with Low Solidity Cascade Diffuser : Control of Secondary Flow by Local Tip-Groove

2009 ◽  
Vol 2009.62 (0) ◽  
pp. 55-56
Author(s):  
Yu KOBA ◽  
Keiichi NAGOSHI ◽  
Tengen MURAKAMI ◽  
Masahiro ISHIDA ◽  
Daisaku SAKAGUCHI ◽  
...  
Keyword(s):  
Secondary Flow ◽  
Centrifugal Blower ◽  
Noise Characteristics ◽  
Low Solidity Cascade Diffuser

Analysis of Secondary Flow Behavior in Low Solidity Cascade Diffuser of a Centrifugal Blower

2010 ◽  
Author(s):  
Masahiro Ishida ◽  
Tengen Murakami ◽  
Daisaku Sakaguchi ◽  
Hironobu Ueki ◽  
Hiroshi Hayami ◽  
...  
Keyword(s):  
Secondary Flow ◽  
Flow Behavior ◽  
Vortex Formation ◽  
Leading Edge ◽  
Centrifugal Blower ◽  
Flow Rates ◽  
Noise Characteristics ◽  
Small Flow ◽  
Blade Tip ◽  
Low Solidity Cascade Diffuser

Aiming at reducing noise without deterioration of diffuser performance in a low solidity cascade diffuser (LSD) of a centrifugal blower, the authors have proposed to locate a shallow and short groove or a slot between the diffuser wall and the LSD blade tip limiting to near the blade leading edge. The effect of the LSD blade tip-groove on the blower characteristics and the noise characteristics were investigated experimentally as well as numerically. The mechanism being able to maintain the high LSD blade loading even at small flow rates was pursued in view points of the vortex formation and the induced secondary flow. In addition, the effect of the tip-groove length on the vortex formation in the shroud tip-groove and the secondary flow behavior in the LSD were analyzed numerically and an optimum tip-groove configuration was proposed. It is concluded that formations of the stable and intense vortex in the shroud tip-groove and the recirculating secondary flow along the shroud wall toward the impeller exit are the key factors for achieving a high LSD performance and reducing noise simultaneously at small flow rates.

E21 Noise Characteristics of Centrifugal Blower with Low Solidity Cascade Diffuser : Reduction of LSD Noise by Local Tip-Groove

2008 ◽  
Vol 2008 (0) ◽  
pp. 203-204
Author(s):  
Tengen MURAKAMI ◽  
Yu KOBA ◽  
Daisaku SAKAGUCHI ◽  
Masahiro ISHIDA ◽  
Yasutoshi SENOO
Keyword(s):  
Centrifugal Blower ◽  
Noise Characteristics ◽  
Low Solidity Cascade Diffuser

D31 Noise Characteristics of Centrifugal Blower with Low Solidity Cascade Diffuser : Effect of radial position of LSD

2007 ◽  
Vol 2007.60 (0) ◽  
pp. 135-136
Author(s):  
Daisaku SAKAGUCHI ◽  
Tengen MURAKAMI ◽  
Masahiro ISHIDA ◽  
Hiroshi HAYAMI ◽  
Yasutoshi SENOO ◽  
...  
Keyword(s):  
Radial Position ◽  
Centrifugal Blower ◽  
Noise Characteristics ◽  
Low Solidity Cascade Diffuser

C13 Noise Characteristics of Centrifugal Blower with Low Solidity Cascade Diffuser : Mechanism of Broadband Noise

2008 ◽  
Vol 2008.61 (0) ◽  
pp. 79-80
Author(s):  
Yu KOBA ◽  
Tengen MURAKAMI ◽  
Daisaku SAKAGUCHI ◽  
Masahiro ISHIDA ◽  
Hironobu UEKI
Keyword(s):  
Broadband Noise ◽  
Centrifugal Blower ◽  
Noise Characteristics ◽  
Low Solidity Cascade Diffuser

2410 Noise Characteristics of Centrifugal Blower with Low Solidity Cascade Diffuser

2006 ◽  
Vol 2006.2 (0) ◽  
pp. 139-140
Author(s):  
Daisaku SAKAGUCHI ◽  
Masahiro ISHIDA ◽  
Hiroshi HAYAMI ◽  
Yasutoshi SENOO ◽  
Hironobu UEKI
Keyword(s):  
Centrifugal Blower ◽  
Noise Characteristics ◽  
Low Solidity Cascade Diffuser

Investigation of Off-Design Performance of Vaned Diffusers in Centrifugal Compressors: Part II — A Low-Solidity Cascade Diffuser

2002 ◽  
Author(s):  
Jong-Sik Oh
Keyword(s):  
Secondary Flow ◽  
Flow Rate ◽  
Centrifugal Compressor ◽  
Three Dimensional ◽  
Flow Fields ◽  
Performance Parameters ◽  
Design Performance ◽  
And Performance ◽  
Compressor Map ◽  
Low Solidity Cascade Diffuser

As the second part of the author’s study, off-design behavior of the design and performance parameters in the low-solidity cascade diffuser in a centrifugal compressor is investigated. The experimental flange-to-flange compressor map serves the validity of application of the present CFD work to the detailed investigation of the low-solidity cascade diffuser. Some meanline design and performance parameters as well as three-dimensional internal secondary flow fields are studied when the flow rate is changed from deep choke to stall.

C14 Improvement of Stall Characteristics in a Centrifugal Blower by Inlet Ring Groove Arrangement and Low Solidity Cascade Diffuser

2008 ◽  
Vol 2008.61 (0) ◽  
pp. 81-82
Author(s):  
Yasunobu TOYOSHI ◽  
Tengen MURAKAMI ◽  
Daisaku SAKAGUCHI ◽  
Masahiro ISHIDA ◽  
Hironobu UEKI
Keyword(s):  
Centrifugal Blower ◽  
Ring Groove ◽  
Low Solidity Cascade Diffuser
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