模拟重复脉冲加热对超音速横流中横向射流边界微扰形成的影响

Q4 Computer Science
Luka Sergeyevich Volkov, A. A. Firsov
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引用次数: 0

摘要

当超声速气流通过平面壁面上的孔口与注入该气流的横向二次射流相互作用时,形成了一种特殊的流动结构。这种流动发生在超音速飞机发动机燃烧室的燃油喷射过程中;因此,近年来,一些国家提出并研究了各种强化这类流动中气体混合的方法。在这项工作中提出的方法意味着使用火花放电对气体进行脉冲加热,并在二次射流边界的剪切层中产生不稳定。利用FlowVision 3.13软件进行仿真,得到了喷油嘴迎风侧壁面不存在和存在脉冲周期性局部热释放时的流动特性。比较了脉冲加热不同周期下的局部特性(对应于Strouhal数0的值)。25和0。31)。结果表明,脉冲加热可以刺激射流边界剪切层中扰动的形成。对于不加热的情况和两种脉冲加热模式,计算了混合效率的积分判据值。结果表明,脉冲加热既可以导致平均混合效率的降低,也可以导致平均混合效率的提高(在考虑的加热模式下可达到9%)。采用非定常reynolds -average Navier - Stokes方程和修正k - ε湍流模型的计算方法,通过考虑二次横向射流与超声速流动相互作用的典型案例进行了验证,该典型案例由几个独立的研究小组进行了研究,并有文献记载。在FlowVision中对该典型案例进行了网格收敛仿真。将FlowVision计算结果与实验数据和其他程序的计算结果进行了定量比较。这项研究的结果对研究超声速气流中气体混合和燃烧问题的专家以及超声速航空发动机的开发都是有益的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modeling the influence of repetitively pulsed heating on the formation of perturbations at the boundary of a transverse jet in a supersonic crossflow
When a supersonic air flow interacts with a transverse secondary jet injected into this flow through an orifice on a flat wall, a special flow structure is formed. This flow takes place during fuel injection into combustion chambers of supersonic aircraft engines; therefore, in recent years, various approaches to intensifying gas mixing in this type of flow have been proposed and studied in several countries. The approach proposed in this work implies using spark discharges for pulsed heating of the gas and generating the instabilities in the shear layer at the boundary of the secondary jet. Using simulation in the software package FlowVision 3.13, the characteristics of this flow were obtained in the absence and presence of pulsed-periodic local heat release on the wall on the windward side of the injector opening. A comparison was made of local characteristics at different periodicities of pulsed heating (corresponding to the values of the Strouhal number 0 . 25 and 0 . 31 ). It is shown that pulsed heating can stimulate the formation of perturbations in the shear layer at the jet boundary. For the case of the absence of heating and for two modes of pulsed heating, the values of an integral criterion for mixing efficiency were calculated. It is shown that pulsed heating can lead both to a decrease in the average mixing efficiency and to its increase (up to 9 % in the considered heating mode). The calculation method used (unsteady Reynolds-averaged Navier – Stokes equations with a modified k - ε turbulence model) was validated by considering a typical case of the secondary transverse jet interaction with a supersonic flow, which was studied by several independent research groups and well documented in the literature. The grid convergence was shown for the simulation of this typical case in FlowVision. A quantitative comparison was made of the results obtained from FlowVision calculations with experimental data and calculations in other programs. The results of this study can be useful for specialists dealing with the problems of gas mixing and combustion in a supersonic flow, as well as the development of engines for supersonic aviation.
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来源期刊
Computer Research and Modeling
Computer Research and Modeling Computer Science-Computational Theory and Mathematics
CiteScore
0.80
自引率
0.00%
发文量
82
审稿时长
15 weeks
期刊介绍: The journal publishes original research papers and review articles in the field of computer research and mathematical modeling in physics, engineering, biology, ecology, economics, psychology etc. The journal covers research on computer methods and simulation of systems of various nature in the leading scientific schools of Russia and other countries. Of particular interest are papers devoted to simulation in thriving fields of science such as nanotechnology, bioinformatics, and econophysics. The main goal of the journal is to cover the development of computer and mathematical methods for the study of processes in complex structured and developing systems. The primary criterion for publication of papers in the journal is their scientific level. The journal does not charge a publication fee. The decision made on publication is based on the results of an independent review. The journal is oriented towards a wide readership – specialists in mathematical modeling in various areas of science and engineering. The scope of the journal includes: — mathematical modeling and numerical simulation; — numerical methods and the basics of their application; — models in physics and technology; — analysis and modeling of complex living systems; — models of economic and social systems. New sections and headings may be included in the next volumes.
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