Drag Reduction of a Cylinder/Endwall Junction Using the Iceformation Method
Drag Reduction of a Cylinder/Endwall Junction Using the Iceformation Method
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使用冰形成方法减少圆柱体/端壁连接处的阻力
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
L. Langston
中科院分区：
文献类型：
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作者：
R. S. Lafleur;L. Langston
采用结冰设计方法来减小圆柱与平板端壁连接处的阻力。冰是在温度低于冰点的平板端壁上，在较暖的层流中形成的。三维分离边界层和圆柱尾迹对冰的形状有影响，并改变了冰的形状。初步的实验被用来指示控制参数的关系。采用自适应选择理论确定最优控制参数。生成了一个样本最佳轮廓，并测试了接合处阻力性能。高雷诺数风洞阻力试验表明，在相同的上游边界层条件下，冰形轮廓的阻力比平板接合处平均低18%。流动显示表明，与Baker（1979）的层流四涡模型相比，冰形等值线产生了三个直径更大的涡。
The iceformation design method was used to reduce the drag of a juncture between a cylinder and flat endwall. Ice was formed on a subfreezing flat endwall in a warmer laminar water flow. The ice shape was influenced by and altered the three-dimensional separated boundary layer and the cylinder wake. Preliminary experiments were used to indicate control parameter relationships. An adaptive selection theory was used to determine optimal control parameters. A sample optimal contour was generated and tested for juncture drag performance. High Reynolds number wind tunnel drag tests showed that the iceform contour had an average of 18 percent lower drag than a flat plate juncture given the same upstream boundary layer conditions. Flow visualizations showed that the iceform contour produced three larger diameter vortices compared to the laminar four vortex model of Baker (1979).