Control of flow in forced jets: a comparison of round and square cross sections

Trushar B. Gohil; Arun K. Saha; K. Muralidhar

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Control of flow in forced jets: a comparison of round and square cross sections

机译：控制强制射流中的流量：圆形和方形截面的比较

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Direct numerical simulation of incompressible, spatially developing round and square jets at a Reynolds number of 1,000 is performed. The effect of two types of inlet perturbation on the flow structures is analyzed. First, dual-mode excitation, which is a combination of axisymmetric perturbation at preferred mode frequency and helical perturbation at sub-harmonic frequency is used, having a disturbance frequency ratio equal to R_f = 2. It is observed that the circular and square jets bifurcate and spread on one of the orthogonal planes forming a Y-shape jet in the downstream while no spreading is visible on the other plane. The second type of perturbation is a flapping excitation at a sub-harmonic frequency, St_F = 0.2. It leads to a Y-shape bifurcation for both square and circular jets. On the other hand, for flapping excitation at the preferred mode frequency, namely, St_F = 0.4, a circular jet bifurcates into a Ψ-shape whereas the square jet reveals simple spreading.

机译：对雷诺数为1,000的不可压缩的，在空间上发展的圆形和方形射流进行直接数值模拟。分析了两种类型的入口扰动对流动结构的影响。首先，使用双模式激励，它是在首选模式频率下的轴对称扰动和在次谐波频率下的螺旋扰动的组合，其扰动频率比等于R_f =2。观察到圆形和方形射流分叉在一个正交平面上扩散，在下游形成Y形射流，而在另一个平面上看不到扩散。第二种扰动是在次谐波频率St_F = 0.2处的拍动激励。它导致方形和圆形喷嘴的Y形分叉。另一方面，对于在最佳模式频率（即St_F = 0.4）上的拍动激励，圆形射流分叉成Ψ形，而方形射流则显示出简单的扩散。

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《Journal of visualization》 |2010年第2期|p.141-149|共9页
作者
Trushar B. Gohil; Arun K. Saha; K. Muralidhar;
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作者单位

Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India;

rnDepartment of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India;

rnDepartment of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India;

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正文语种 eng
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关键词
jet control; round jets; square jets; DNS; bifurcating jets;

机译：喷射控制圆形喷嘴方形喷气机DNS;分叉射流;

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机译：HERA的NC DIS中的包含喷嘴横截面和 k T ，反- k T 和SIScone jet算法
2. Measurement of three-jet differential cross sections d σ 3 jet / d M 3 jet in p p ˉ collisions at s = 1.96 TeV [J] . V.M. Abazov, B. Abbott, B.S. Acharya, Physics letters . 2011,第5期

机译：三喷嘴差动横截面的测量 d σ 3 jet / d M 3 jet 在 p p ˉ 在 s = 1.96 TeV
3. Measurement of the differential γ + c -jet cross section and the ratio of differential γ + c and γ + b cross sections in p p ˉ collisions at s = 1.96 TeV [J] . V.M. Abazov, B. Abbott, B.S. Acharya, Physics letters . 2013,第4a5期

机译：差分 γ + c -射流截面和差值 γ + c 和 γ + b 截面si4.gif“ display =” inline“ overflow =” scroll“> p p < mml：mo>ˉ 在 s = 1.96 TeV
4. Is it Round, Square or Oval: Repair of a Culvert with Multiple Cross Sections [C] . Mo Ehsani, Alex Christensen, Marvin Murphy NASTT's No-Dig Show 2018 - Full Conference Proceedings . 2018

机译：它是圆形，方形还是椭圆形：修复具有多个横截面的涵洞
5. The constructal evolution of the cross sections of jets toward the round shape. [D] . Ziaei, Shiva. 2013

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6. Evolution: Why all plumes and jets evolve to round cross sections [O] . A. Bejan, S. Ziaei, S. Lorente -1

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7. Measurement of inclusive jet cross sections in Z/gamma*(-->e+e-) + jets production in pp[over ] collisions at square root s = 1.96 TeV. [O] . Aaltonen, T, Adelman, J, Akimoto, T, 2008

机译：测量Z / gamma *（-> e + e-）中包含的射流横截面+在平方根s = 1.96 TeV处pp [over]碰撞中产生的射流。

Control of flow in forced jets: a comparison of round and square cross sections

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