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RISS 인기검색어
- 검색키워드
- 저자 : Feiran Cheng (검색결과 3 건)
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Chang Guo,Feiran Lv,Ming Gao,Wei Wei,Shen Cheng 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.10
Aiming at the quiet centrifugal pump design, the effect of number of blades on the flow-induced noise is explored. The results show that the sound pressure fluctuation is generated due to the influence of sound source fluctuation and adjacent spatial locations, and the fluctuation ranges of sound source and sound pressure at the same location change little with the change in the number of blades. Additionally, the total sound source intensity increases along the flow direction in the volute under the same rotational radius, while it increases slowly and even decreases near the outlet of the impeller, which causes similar evolution characteristics of noise. Besides, the volume-weighted standard deviation of sound source (V-STDSS) is proposed to characterize the overall sound intensity, and the V-STDSS proportion of impeller is more than 0.6. The impeller with an even number of blades has a better sound performance, while the noise induced by volute with an odd number of blades is lower. Generally, the centrifugal pumps with an even number of blades have a better sound performance. This research can guide the noise control and optimization design of centrifugal pumps.
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Tao, Bo,Lei, Wen,Cheng, Feiran,Xia, Hua Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.6
Two cobalt(II) compounds $[Co(2,2{^\prime}-bipy)(H_2O)_2(SO_4)]_n$ (1) and $[Co_2(2,2^{\prime}-bipy)_2(btec)(H_2O)_6]{\cdot}2H_2O$ (2) (2,2'-bipy = 2,2'-bipyridine, $H_4btec$ = 1,2,4,5-benzenetetracarboxylic acid), have been simultaneously synthesized by a one-pot slow solvent evaporation reaction. Their structures were determined by single-crystal X-ray diffraction and further characterized by X-ray powder diffraction (XRPD), IR, elemental and thermogravimetric analysis (TGA). The structural analysis reveals that compound 1 exhibits an infinite 1D chain structure with the octahedral Co(II) centers bridging by the tetrahedral ${\mu}_2-SO{_4}^{2-}$ ligands, while compound 2 possesses a dinuclear $Co_2(2,2^{\prime}-bipy)_2(btec)(H_2O)_6$ unit and the two adjacent octahedral Co(II) ions are linked by the bismonodentately coordinated btec ligand. Additionally, compound 2 exhibits blue fluorescent emission in the solid state at room temperature.
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Bo Tao,Wen Lei,Feiran Cheng,Hua Xia 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.6
Two cobalt(II) compounds [Co(2,2'-bipy)(H2O)2(SO4)]n (1) and [Co2(2,2'-bipy)2(btec)(H2O)6]·2H2O (2) (2,2'- bipy = 2,2'-bipyridine, H4btec = 1,2,4,5-benzenetetracarboxylic acid), have been simultaneously synthesized by a one-pot slow solvent evaporation reaction. Their structures were determined by single-crystal X-ray diffraction and further characterized by X-ray powder diffraction (XRPD), IR, elemental and thermogravimetric analysis (TGA). The structural analysis reveals that compound 1 exhibits an infinite 1D chain structure with the octahedral Co(II) centers bridging by the tetrahedral μ2-SO4 2− ligands, while compound 2 possesses a dinuclear Co2(2,2'-bipy)2(btec)(H2O)6 unit and the two adjacent octahedral Co(II) ions are linked by the bismonodentately coordinated btec ligand. Additionally, compound 2 exhibits blue fluorescent emission in the solid state at room temperature.
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