| 等腰三角形湍流射流的流动特性实验研究 |
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| 作者姓名： | 栾剑 徐敏义 马梓然 李敏 刘晓鹏 |
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| 作者单位： | 大连海事大学轮机工程学院，辽宁大连 116026 |
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| 基金项目： | 国家自然科学基金51506019辽宁省自然科学基金2012025012 |
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| 摘 要： | 对喷嘴等效直径相同出口Reynolds数均为15000的3种等腰三角形（顶角分别为30，60和90°）以及圆形孔口射流进行了流场显示与速度场测量.结果表明:相比于圆形射流，等腰三角形射流的出口中心线速度衰减更快，湍流度更高，三角形射流卷吸周围流体能力显著增强.随着三角形顶角减小，近场区涡结构三维性更强，卷吸效果更明显.此外，对不同射流的中心线湍动能谱概率密度函数Taylor尺度和Kolmogorov尺度进行了分析讨论，发现出口形状对湍流小尺度运动的影响较小.
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| 关 键 词： | 非圆形射流 多尺度 频谱 热线风速仪 |
| 收稿时间： | 2016-11-30 |
Experimental Investigation of Flow Characteristics Issuing from Isosceles Triangular Orifices |
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| Institution: | Marine Engineering College, Dalian Maritime University, Dalian 116026, China |
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| Abstract: | The present study systematically investigated the statistical properties of the free air jets issuing from isosceles triangular orifices with apex angles of 30, 60 and 90°. The velocity was measured by a hot-wire anemometer at the exiting Reynolds number (Re) being 15000 for all jets, based on the equivalent diameter of the triangular orifices. The results show that the centreline mean velocity decays faster and turbulence intensity grows higher as AR decays. With jet flows developing downstream, the turbulence energy spectrum, probability density function and turbulence length scales of triangular jets approach to those of circular jets. |
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