Noise Characteristics of Centrifugal Blower with Low Solidity Cascade Diffuser (Noise Reduction by means of Small Groove Located at LSD Blade Leading Tip) |
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摘 要: |
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关 键 词: | 叶片前缘 离心风机 级联 低硬度 降噪 散光 噪声 性能恶化 |
收稿时间: | 21 June 2004 |
Noise characteristics of centrifugal blower with low solidity cascade diffuser (Noise reduction by means of small groove located at LSD blade leading tip) |
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Authors: | Tengen Murakami Masahiro Ishida Daisaku Sakaguchi Yu Koba |
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Affiliation: | Graduate School of Science and Technology, Nagasaki University, 1-14 Bunkyo-machi Nagasaki 852-8521 JAPAN |
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Abstract: | This paper deals with the effect of the blade tip-groove of the low solidity cascade diffuser (LSD) on the blower characteristic
and the noise generated by the LSD. The small grooves were set up at the root and/or tip near the leading edge of the LSD
blade. In order to clarify the mechanism of noise increase due to LSD and also to reduce the noise, the relationships between
the noise increase based on the LSD, the LSD performance and the secondary flow formed additionally by the tip-groove were
investigated experimentally as well as numerically, especially analyzing flow behaviors in the LSD in view points of flow
separation on the suction surface of the LSD blade and the secondary flow on the side walls. By reducing the stagnation region
smaller near the root and/or tip of the LSD blade leading edge, the secondary flow behavior changes remarkably around the
LSD blade, as a result, the noise level and the blower characteristics vary. It can be concluded that, by means of a small
tip-groove located only at the shroud side near the LSD blade leading edge, the noise generated by the LSD can be reduced
without deteriorations of the LSD performance and the blower characteristics as well. |
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