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Optimal Design of two-chamber Gas Distributor with CFD Approach

Journal of Harbin Institute of Technology(New Series) 2015年第2期22卷 79-85页

作者： Dongfang Zhao Fengguo Liu Xueyi You Xinhua Wang School of Energy and Safety Engineering Tianjin Chengjian University School of Environmental Science and Engineering Tianjin University Tianjin Urban Construction Management and Vocational Technology College

Computational fluid dynamics( CFD) is used to investigate a new type of two-chamber natural gas distributor,which has a natural gas inlet and nine nozzle outlets. The uniformity at the outlet of distributor is practice proven to have significant degree influence on its comprehensive performance. To improve the uniformity at the nozzles of the gas distributor,CFD modeling with the RNG k-ε turbulence model is undertaken to understand the mass flow rate of nozzles with reference to different length of chambers and the most optimal length is obtained. The internal flow pattern of the natural gas distributor is analyzed. It is found that the local maximum deviation of the nozzle outflow rate increases with the increase of chambers length when the length is more than 64 mm. The results provide useful suggestions for the optimal design of two-chamber natural gas distributor.

关键词： gas distributor two-chamber CFD uniformity nozzle mass flow rate

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Genesis and evolution of subduction-zone andesites:evidence from melt inclusions

Genesis and evolution of subduction-zone andesites:evidence ...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Ming-Shuai Zhu Lai-Cheng Miao Shun-Hu Yang Institute of Geology and Geophysics Chinese Academy of Sciences

Andesite magmatism plays a major role in continental crustal growth,but its subduction-zone origin and evolution is still a hotly debated *** with whole-rock analyses,melt inclusions(MIs)can provide important direct information on the processes of magma *** this article,we synthesize data for melt inclusions hosted by phenocrysts in andesites, extracted from the GEOROC global *** data show that melt inclusions entrapped by different phenocrysts have distinct compositions:olivine-hosted melt inclusions have basalt and basaltic andesite compositions,whereas melt inclusions in clinopyroxene and othopyroxene are mainly dacitic to ***-hosted melt inclusions have rhyolite *** compositions of melt inclusions entrapped by plagioclase are scattered,spanning from andesite to rhyolite. On the basis of the compositional data,we propose a mixing model for the genesis of the andesite,and a two-chamber mechanism to account for the evolution of the ***,andesite melt is generated in the lower chamber by mixing of a basaltic melt derived from the mantle and emplaced in the lower crust with a felsic melt resulting from partial melting of crustal *** and minor plagioclase likely crystallize in the lower magma ***,the andesite melt ascends into the upper chamber where other phenocrysts *** to SiO-MgO diagrams of the MIs,evolution of the andesite in the upper chamber can be subdivided into two distinct *** early stage(Ⅰ)is characterized by a phenocrystal assemblage of clinopyroxene+othopyroxene + plagioclase,whereas the late stage(Ⅱ)is dominated by crystallization ofplagioclase + hornblende.

关键词： melt inclusions petrogenesis of andesite magma mixing two-chamber phenocryst assemblage

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