Effects of unsteady oblique shock wave on mixing efficiency of two-dimensional supersonic mixing layer

Zha, Zhangming; Ye, Zhengyin; Hong, Zheng; Ye, Kun

doi:10.1016/j.actaastro.2020.07.028

Cited by 24 publications

(5 citation statements)

References 40 publications

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“…In this article, a 2-D model is used to simulate the shock/mixing interaction, which is essentially a three-dimensional problem, and the two-dimensional model is a serious approximation. However, this article is an internal flow study in the context of fuel–air mixing in a scramjet; many studies 28,34 on the relevant internal flow are approximated by two-dimensional models. Previous studies 35 have shown that the mixing layer will show 2-D characteristics when the convective Mach number is not greater than .6 (for the current simulation, Mc= 0.6).…”

Section: The Cfd Methods and Its Validationmentioning

confidence: 99%

“…The code has been used many times to study the interaction between shock waves and turbulence, including the shock/mixing interaction. 28,31…”

Section: Governing Equationsmentioning

confidence: 99%

“…Based on the above research status and problems, unsteady shock waves are proposed to enhance mixing. 28 As a typical internal flow problem, especially in the presence of a very complex surge structure in the flow field, the wall height will inevitably affect the mixing efficiency in the scramjet. In this article, the shock structure, total pressure loss, mixing layer thickness, and turbulence intensity of the unsteady shock/mixing layer interaction at different wall heights are calculated and compared, aiming to provide a design reference for fast mixing of fuel and air in scramjet engines.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of unsteady shock/mixing interaction in confined space

Zha

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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Unsteady shock wave enhancement is an effective technical approach to achieve air/fuel mixing under high speed and compressible conditions. However, unsteady shock/mixing interactions are always accompanied by complex wave structures, so the height of the combustion chamber will inevitably have a significant impact on shock waves and engine performance. In this regard, shock/mixing interactions in confined space are studied in this article by direct numerical simulation to investigate the effect of wall constraint on shock wave enhancement. Shock wave structure, total pressure loss, thickness of mixing layer, and turbulence intensity of flow field with different confinement degrees are calculated and compared. The results show that the unsteady shock wave can dramatically enhance the thickness of the mixing layer and the turbulence intensity, thus improving the mixing efficiency. In addition, as the wall constraint increases, the intensity of the shock wave and the total pressure loss increase; the flow field is more prone to Mach reflection. The average total pressure loss caused by steady shock wave and unsteady shock wave is essentially the same for an identical wall height, but the total pressure distortion caused by the unsteady shock wave is more substantial. Furthermore, the enhancements of mixing efficiency by the shock wave are also affected significantly by the degree of wall constraint; therefore, a suitable wall height needs to be determined in order to achieve the highest mixing efficiency.

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Section: The Cfd Methods and Its Validationmentioning

confidence: 99%

“…The code has been used many times to study the interaction between shock waves and turbulence, including the shock/mixing interaction. 28,31…”

Section: Governing Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical study of unsteady shock/mixing interaction in confined space

Zha

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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“…5a. The shock and expansion waves shaped by the fuel struts play an essential role on supersonic mixing and combustion processes [40,41]. The fuel stream from one strut into the high-speed air flow is oriented by the shock-expansion waves created by the entire set of struts.…”

Section: Design Variablesmentioning

confidence: 99%

Reduced-order modeling of supersonic fuel–air mixing in a multi-strut injection scramjet engine using machine learning techniques

et al. 2023

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“…The modifications suggested are seen to improve the applicability of the existing correlations. [8] studied the effects of unsteady oblique shock waves on the mixing efficiency of a two-dimensional supersonic mixing layer. They used direct numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Oblique Shock Wave

Ali

2023

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This study aims to investigate some physical parameters in presence of an oblique shock wave numerically. Computational fluid dynamics has been used to analyze fluid behavior upstream and downstream of the shock wave. To obtain a good resolution, the computational domain is constructed by fine meshing. Due to its wide use in engineering applications, Air has been used as fluid material. A wedge of half-angle q = 22° has been used to intercept the airflow path and founding the oblique shock wave of anglef. For gathering comprehensive information, the air flows have been tested for three Mach numbers, namely slightly higher than 1, slightly higher than two, and slightly higher than three (M1~=1, M2~=2, and M3~=3) and represented as a case (a), (b) and (c) respectively. The continuity equation, momentum equation, and energy equation have been solved numerically. Velocity, turbulent viscosity, total pressure, and total enthalpy have been investigated upstream and downstream of the shockwave for the three different Mach numbers. The results showed that the total pressure downstream of the shock wave was less than that of the upstream shock wave. In addition, the turbulent viscosity area around the object becomes thicker as the Mach numbers become bigger. Also, the total pressure was slightly different for the three different Mach numbers. These behaviors of the above-mentioned parameters are attributed to the shock wave effects. In addition, the oblique shock wave angle f is appeared to be decreased as the Mach number increased.

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Effects of unsteady oblique shock wave on mixing efficiency of two-dimensional supersonic mixing layer

Cited by 24 publications

References 40 publications

Numerical study of unsteady shock/mixing interaction in confined space

Numerical study of unsteady shock/mixing interaction in confined space

Reduced-order modeling of supersonic fuel–air mixing in a multi-strut injection scramjet engine using machine learning techniques

Numerical Study of Oblique Shock Wave

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