Computational Fluid Dynamics Simulation of High Speed Jet Under Different Input Pressures
Computational Fluid Dynamics Simulation of High Speed Jet Under Different Input Pressures
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DOI：
10.11648/j.ijhep.20170401.12
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发表时间：
2017-05
期刊：
影响因子：
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通讯作者：
J. Gong;W. Xia;Jihua Li;X. Wei
中科院分区：
文献类型：
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作者：
J. Gong;W. Xia;Jihua Li;X. Wei
本研究的目的是对不同输入压力（80mpa、120mpa、160mpa、200mpa和240mpa）下的高速射流进行计算流体力学（CFD）模拟。本文重点研究高速射流中孔板的压力分布和流线，主要是因为孔板具有加速液体流动的作用，对高速射流的工作性能有重要影响。首先，根据实际工况建立了高速射流的二维几何模型；其次，利用ICEM CFD 16.0软件生成高速射流的非结构化网格。实际上，高速射流的计算流体动力学模拟是一个两相流（气液）问题，因此采用均匀的（欧拉-欧拉）两相模型来进行气液相互作用。特别地，采用基于reynolds -average Navier-Stokes （RANS）方程的程序进行了高速射流的湍流计算。由于高速射流的流动具有很强的湍流性，本研究采用了Yakhot et al.（1992）导出的RNG k- ε湍流模型。最后，利用ANSYS CFX 16.0中的CFX- solver实现了高速射流的计算流体动力学（CFD）仿真。仿真结果表明，当液体流过节流孔时，流体压力迅速下降，流速急剧上升至最大值后略有下降。此外，还得到了工作压力与输入压力的关系以及工作速度与输入压力的关系，为基于实际输入压力预测高速射流的工作压力和速度提供了一定的理论指导。
The aim of this study is to execute the computational fluid dynamics (CFD) simulation of high speed jet under different input pressures (i.e., 80, 120, 160, 200, and 240 MPa). In particular, this study focuses on the pressure distributions and streamlines of the orifice in high speed jet, primarily because the orifice plays a role in accelerating the flow of liquid, having significant effects on the working performance of high speed jet. Firstly, the two-dimensional geometric model of high speed jet is established on the basis of the actual operational conditions. Next, the unstructured grids of high speed jet are generated by means of ICEM CFD 16.0. Virtually, the computational fluid dynamics simulation of high speed jet is a two-phase flow (gas-liquid) problem, so the homogeneous (Eulerian-Eulerian) two-phase model is employed to carry out the gas-liquid interaction. Particularly, the turbulent flow computation of high speed jet is carried out with procedures based on the Reynolds-averaged Navier-Stokes (RANS) equations. As the flow of high speed jet is highly turbulent, the RNG k-ɛ turbulence model derived by Yakhot et al. (1992) is utilized in this study. Finally, the computational fluid dynamics (CFD) simulation of high speed jet is implemented by using the CFX-Solver in ANSYS CFX 16.0. The simulation results show that when liquid flows through the orifice, the pressure of flows decreases swiftly, whereas the velocity of flows skyrockets to the maximum value and then decreases slightly. In addition, the relationship between the working pressure and input pressure and the relationship between the working velocity and input pressure are achieved, which could provide certain theoretical guidance for predicting the working pressure and velocity of high speed jet based on real input pressures.