An improved micro-vortex generator in supersonic flows

Zhang, Binbin; Zhao, Qingjun; Xiang, Xin; Xu, Jinliang

doi:10.1016/j.ast.2015.09.029

Cited by 30 publications

(10 citation statements)

References 12 publications

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“…In addition to strengthening the boundary layer, vortex generators also increase the drag. The wall normal extent of their wake increases the boundary layer thickness and may affect the outer flow field [5,6]. The micro vortex generator (MVG), submerged in the boundary layer, is aimed to reduce these adverse effects [2,7,8].…”

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confidence: 99%

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Relation Between Geometry and Wake Characteristics of a Supersonic Microramp

2021

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mentioning

confidence: 99%

“…Various past studies have assessed the effectiveness of micro ramps for flow control [1,2,6,[9][10][11][12][13][14]. The flow structure of the micro ramp wake has been explored in detail both computationally and experimentally [5,15,24,[16][17][18][19][20][21][22][23].…”

mentioning

confidence: 99%

Relation Between Geometry and Wake Characteristics of a Supersonic Microramp

2021

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“…Generally, VGs could change the flow direction of the boundary layer cross-flow near the end-wall as well as transport high-energy fluid from the main flow into the boundary layer to suppress the corner separation, which has become one of the most effective ways to improve the aerodynamic performance of a compressor. With the development of researches about VGs, an increasing number of keywords such as sub-merged VGs, 18 micro-VGs, 19 low-profile VGs, 20 micro vanes 21 appear in studies, which means that the structural development of VGs has shown a trend of “micro,” and the height is between 0.1 and 0.5 inflow boundary layer thicknesses. Numerous studies have shown that micro-vortex generators (MVGs) show more advantages than traditional VGs.…”

Section: Introductionmentioning

confidence: 99%

Effects of modified micro-vortex generators on aerodynamic performance in a high-load compressor cascade

Chu

Zhang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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In the current study, the effects of micro-vortex generators on the flow characteristics of a high-load compressor cascade are investigated, and four types of micro-vortex generators including “rectangular,” “curved rectangular,” “trapezoidal,” and “curved trapezoidal” are considered and named VGR, VGCR, VGT, and VGCT separately. The calculated results show that a rising reverse flow region, which is considered a main reason for occurring stall at +8° incidence, collapses rapidly from the leading edge in the cascade. Therefore, the micro-vortex generators are all mounted on the end-wall in front of the passage to suppress the development of the secondary flow, and the stall occurrence is delayed from +8° to +11° incidence by applying VGCT. At the design condition, the VGT can make the total pressure loss decrease by 0.54%. The modified micro-vortex generators show an obvious superiority when the range of incidence is between +3° and +8°. At the stall condition, the VGCT can make the total pressure loss decrease by 9.36%. Moreover, the reduction of the secondary flow loss is considered a main goal of the adoption of micro-vortex generators which is an achievement for decreasing the total pressure loss, and the highest reduction of the secondary flow loss reaches 34.6% at the stall condition in the cascade with VGCT.

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“…The micro vortex generator (MVG), a class of passive control device, is used to eliminate flow separation. Optimization of MVG geometry has been carried out by Zhang [2], Lee [3], and Verma [4]. Lu [5] explored MVG's flow control mechanism .…”

Section: Introductionmentioning

confidence: 99%

Characterization of transverse plasma jet and its effects on ramp induced separation

Tang

Wang

et al. 2018

Experimental Thermal and Fluid Science

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Plasma synthetic jet actuator (PSJA), which produces pulsed jets, is used to control the shock wave boundary layer interaction at a compression ramp at Ma=2.0. The flow topology of the wall jets from the PSJA is first visualised through particle laser scattering (PLS) photography. The PSJA aperture effect is also examined by comparing the jets out of the apertures of 1,2 mm and 2 mm respectively. The control effect is later investigated by both PLS and particle image velocimetry (PIV). , which was erupted from different jet apertures of 1.2mm and 2mm, were compared experimentally in a wind tunnel of Mach 2. Further, the interaction between the TPJ and the ramp induced separation was explored. The phase-locked two-component particle image velocimetry (PIV) and particle laser scattering (PLS) were used for flow visualizations. The K-H vortices and hairpin vortices due to the shear stress between the jet plume and high-speed mainstream were identified.The results show that the TPJ in supersonic flow is characterized by two typical parts: the attached jet plume (AJP) and the detached jet plume (DJP). The penetration height of the jet plume, which is closely related to the jet aperture, plays a dominant role in the proportion of the two parts. The higher jet penetration height leads to the more detached jet plume. As for the interaction between the jet plume and separation zone, the attached jet plume was blocked by the separation zone, which formed a recirculation zone and contributed to an expansion of the separation. In contrast, the detached jet plume transited along the shear layer and then enhanced the velocity exchange between the shear layer and mainstream. Ultimately, the reduction of the separation zone was revealed with the overall shear layer reduced. Furthermore, a conceptual model based on two typical morphological features was suggested to reveal the interaction mechanism.

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An improved micro-vortex generator in supersonic flows

Cited by 30 publications

References 12 publications

Relation Between Geometry and Wake Characteristics of a Supersonic Microramp

Relation Between Geometry and Wake Characteristics of a Supersonic Microramp

Effects of modified micro-vortex generators on aerodynamic performance in a high-load compressor cascade

Characterization of transverse plasma jet and its effects on ramp induced separation

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