On the interaction of a planar shock with a three-dimensional light gas cylinder
On the interaction of a planar shock with a three-dimensional light gas cylinder
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平面激波与三维轻气缸的相互作用
DOI：
10.1017/jfm.2017.528
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发表时间：
2017-09
影响因子：
3.7
通讯作者：
Luo Xisheng
中科院分区：
文献类型：
--
作者：
Ding Juchun;Si Ting;Chen Mojun;Zhai Zhigang;Lu Xiyun;Luo Xisheng
对平面激波与二维和三维轻气瓶的相互作用进行了实验和数值研究。重点分析了初始界面曲率对流动形态、波型、涡量分布和界面运动的影响。在实验中，采用了基于肥皂膜技术的线束约束方法，生成了形状特征良好的N2柱体，包括凸柱体、具有最小曲面特征的凹柱体和二维柱体。高速纹影图像表明，与前人的研究相比，流场中的扰动波较少，界面演化的对称性更强。将高阶加权基本无振荡结构与双通量格式相结合，对三维流动结构进行了详细的数值模拟。结果表明，由于水平速度和垂直速度的同时存在，沿垂直方向不同平面上的三维气柱的形状和大小逐渐发生变化。在非常早期的阶段，复杂波引起的演化界面附近的压力振荡对三维气瓶的变形有很大的贡献。随着时间的推移，界面上沉积的斜压涡度将主导激波体积的发展。与二维情况相比，凹(或凸)SF6/N2边界的相反符号主曲率引起了复杂的高压区和额外的涡量沉积，且凹(或凸)N2圆柱体对称切片的上游界面有抑制(或促进)运动。最后，提出了预测不同气瓶上游界面运动的广义三维理论模型，并对实验结果和数值结果进行了较好的预测。
Experimental and numerical investigations on the interaction of a planar shock wave with two-dimensional (2-D) and three-dimensional (3-D) light gas cylinders are performed. The effects of initial interface curvature on flow morphology, wave pattern, vorticity distribution and interface movement are emphasized. In experiments, a wire-restriction method based on the soap film technique is employed to generate N $_{2}$ cylinders surrounded by SF $_{6}$ with well-characterized shapes, including a convex cylinder, a concave cylinder with a minimum-surface feature and a 2-D cylinder. The high-speed schlieren pictures demonstrate that fewer disturbance waves exist in the flow field and the evolving interfaces develop in a more symmetrical way relative to previous studies. By combining the high-order weighted essentially non-oscillatory construction with the double-flux scheme, numerical simulation is conducted to explore the detailed 3-D flow structures. It is indicated that the shape and the size of 3-D gas cylinders in different planes along the vertical direction change gradually due to the existence of both horizontal and vertical velocities of the flow. At very early stages, pressure oscillations in the vicinity of evolving interfaces induced by complex waves contribute much to the deformation of the 3-D gas cylinders. As time proceeds, the development of the shocked volume would be dominated by the baroclinic vorticity deposited on the interface. In comparison with the 2-D case, the oppositely (or identically) signed principal curvatures of the concave (or convex) SF $_{6}$ /N $_{2}$ boundary cause complex high pressure zones and additional vorticity deposition, and the upstream interface from the symmetric slice of the concave (or convex) N $_{2}$ cylinder moves with an inhibition (or a promotion). Finally, a generalized 3-D theoretical model is proposed for predicting the upstream interface movements of different gas cylinders and the present experimental and numerical findings are well predicted.
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影响因子：
2.2
作者：
Lindl, John;Landen, Otto;Baxamusa, S. H.
通讯作者：
Baxamusa, S. H.
影响因子：
3
作者：
RICHTMYER, RD
通讯作者：
RICHTMYER, RD
影响因子：
3.7
作者：
C. Niederhaus;J. Jacobs
通讯作者：
C. Niederhaus;J. Jacobs
影响因子：
3.7
作者：
Zhai Zhigang;Wang Minghu;Si Ting;Luo Xisheng
通讯作者：
Luo Xisheng
影响因子：
4.6
作者：
P. Chapman;J. Jacobs
通讯作者：
P. Chapman;J. Jacobs