| 叶片形状对倒伞曝气机性能的影响 |
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| 引用本文： | 明加意,董亮,刘厚林,赵宇琪,姚瀚.叶片形状对倒伞曝气机性能的影响[J].排灌机械工程学报,2018,36(2):104-110. |
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| 作者姓名： | 明加意 董亮 刘厚林 赵宇琪 姚瀚 |
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| 作者单位： | 1.江苏大学国家水泵及系统工程技术研究中心, 江苏 镇江 212013; 2.过程装备与控制工程四川省高校重点实验室, 四川 自贡 643000; 3.沈阳鼓风机集团石化泵有限公司, 辽宁 沈阳 110869 |
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| 摘 要： | 为了探究直叶片和倾斜叶片对倒伞曝气机性能的影响,获得不同叶片形状倒伞曝气机驱动下氧化沟的流场特性,以1个符合几何相似、运动相似和动力相似理论的缩比双倒伞曝气机驱动下的氧化沟模型为研究对象,采用VOF自由液面模型与标准k-ε湍流模型相结合的方法,对不同叶片形状的倒伞曝气机驱动下的氧化沟内部流动进行了三维数值模拟.结果表明,2类倒伞曝气机消耗的功率相近,叶片形状的不同影响着倒伞曝气机的充氧能力和推流能力:直叶片倒伞曝气机驱动下,氧化沟过轴截面的气相体积分数较倾斜叶片大0.66%;直叶片倒伞曝气机对表层水域的推动能力较强,而倾斜叶片倒伞曝气机则对底层流体有较强的推动能力,沟底死水区相较于直叶片倒伞曝气机减小0.70%,且倒伞曝气机附近的流体能以较快的速度流向壁面;在双倒伞曝气机驱动下,氧化沟内的流动呈对称分布,下游倒伞曝气机能够明显提升和加速来流速度.
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| 关 键 词： | 倒伞曝气机 氧化沟 叶片形状 VOF 数值模拟 |
| 收稿时间： | 2016-05-09 |
Influence of blade shape on performance in inverse umbrella aerator |
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| MING Jiayi,DONG Liang,LIU Houlin,ZHAO Yuqi,YAO Han.Influence of blade shape on performance in inverse umbrella aerator[J].Journal of Drainage and Irrigation Machinery Engineering,2018,36(2):104-110. |
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| Authors: | MING Jiayi DONG Liang LIU Houlin ZHAO Yuqi YAO Han |
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| Institution: | 1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Sichuan Provincial Key Lab of Process Equipment and Control, Zigong, Sichuan 643000, China; 3. Shenyang Blower Group, Petrochemical Pump Co. Ltd., Shen-yang, Liaoning 110869, China |
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| Abstract: | In order to study the effect of radial straight blade and leaned blade on the performance of inverse umbrella aerator and obtain the flow characteristic of a oxidation ditch driven by two inverse umbrella aerators with different kinds of blade shape, a lab scale oxidation ditch according with geometric similarity, kinematic similarity and dynamic similarity was taken as the research object. The volume of fluid(VOF)model was adopted and the standard k-ε turbulence model was applied to close the governing equations. Through changing the blade shape of inverse umbrella aerator, three-dimensional numerical simulations were conducted. The results show that the power assumption of these two kinds of inverse umbrella aerators is much the same, the blade shape has a significant impact on oxygenation capacity and plug-flow capacity on the inverse umbrella aerator: under the drive of inverse umbrella aerator with radial straight blade, the gas volume fraction of the section crossing the driving shaft in the oxidation ditch is 0.66% higher than that in the oxidation ditch driven by the inverse umbrella aerator with leaned blade; while the inverse umbrella aerator with radial straight blade has a stronger ability to promote the fluid near the surface, the inverse umbrella aerator with leaned blade does better on driving fluid at the bottom of the ditch, with the dead water zone 0.70% less than that in the ditch driven by the inverse umbrella aerator with radial straight blade. The fluid stirred by the inverse umbrella aerator with leaned blade flows to the wall at a higher speed. The flow distribution of the oxidation ditch driven by two inverse umbrella aerators is symmetrical. The downstream inverse umbrella aerator has an ability to lift and accelerate the incoming flow. |
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| Keywords: | inverse umbrella aerator oxidation ditch blade shape VOF numerical simulation |
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