| 周刚,汪家道,陈大融.小型水洞拐角导流片的数值设计[J].计算力学学报,2010,27(1):102~109 |
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| 小型水洞拐角导流片的数值设计 |
| Numerical deign of guide vanes in elbow bends of a minitype high-speed water-tunnel |
| 投稿时间：2007-12-20 |
| DOI：10.7511/jslx20101017 |
| 中文关键词: 导流片 拐角 水洞 数值模拟 RNG k-ε湍流模型 |
| 英文关键词:guide vanes elbow bends water tunnel fluid dynamic simulation RNG k-ε turbulent model |
| 基金项目:国家重点基础研究发展计划(973)2007CB707702;国家自然科学基金创新研究群体(50721004)资助项目. |
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| 中文摘要: |
| 拐角是回流式水洞的重要组成部分,对实验段流场的品质有着重要的影响。本文针对某小型高速水洞中的第四拐角,利用RNG k-ε湍流模型,对比模拟了导流片对拐角流场的影响。针对一种等厚圆弧形导流片的长度、布置等进行了对比计算。结果表明导流片的安装对提高流场均匀性、降低湍动能和减弱二次流等具有非常大的意义,其中半径／边长比为0.2、间距／弦长为0.15~0.25的导流片效果最为明显;文中两种非等间距的导流片分布方式以及-4°和+4°攻角的情形对流场影响较小。 |
| 英文摘要: |
| Elbow bends are necessary parts of pipes, which have an important influence on the flow field of the corner and later sections. Guide vanes are always employed in elbow bends. The influences on the flow field with ＆ without guide vanes were simulated and compared using RNG k-ε turbulent model. The improved 1／4-circle-shaped guide vanes were considered, which had different tail length and different dispositions. The numerical simulation showed that: ① guide vanes can improve the velocity uniformity, reduce the turbulent kinetic energy and decrease the secondary flow; ② 1／4-circle-shaped guide vanes with tails are better than no tail; ③ ratios of vane spacing to chord length between 0.15~0.25 is better; ④ non-equivalent vane spacing shows less improvement than equivalent ones; ⑤ the attack angles of -4 and +4° have less influence on the quality of the flow field. |
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