Instantaneous and time-averaged flow structures around a blunt double-cone with or without supersonic film cooling visualized via nano-tracer planar laser scattering

Zhu, Yangzhu; Yi, Shihe; He, Lin; Tian, Ling; Zhou, Yue

doi:10.1088/1674-1056/22/1/014702

Cited by 19 publications

(8 citation statements)

References 30 publications

(25 reference statements)

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“…[25] It has been used to investigate the supersonic mixing layer, boundary layer, aerooptics, and so forth. [24][25][26][27][28][29][30][31] As shown in Fig. 3, the NPLS system is composed of a nanoparticle generator, a dual-cavity Nd:YAG laser, an interline transfer double-exposure CCD camera, a synchronizer, and a computer.…”

Section: Npls Techniquementioning

confidence: 99%

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Imaging of supersonic flow over a double elliptic surface

Qing-hu¹,

Yi²,

He³

et al. 2013

Chinese Phys. B

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The coherent structures of flow over a double elliptic surface are experimentally investigated in a supersonic lownoise wind tunnel at Mach number 3 using nano-tracer planar laser scattering (NPLS) and particle image velocimetry (PIV) techniques. High spatiotemporal resolution images and velocity fields of both laminar and turbulent inflows over the test model are captured. Based on the time-correlation images, the spatial and temporal evolutionary characteristics of the coherent structures are investigated. The flow structures in the NPLS images are in good agreement with the velocity fluctuation fields by PIV. From statistically significant ensembles, spatial correlation analysis of both cases is performed to quantify the mean size and the orientation of coherent structures. The results indicate that the mean structure is elliptical in shape and the structural angles in the separated region of laminar inflow are slightly smaller than that of turbulent inflow. Moreover, the structural angles of both cases increase with their distance away from the wall.

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Section: Npls Techniquementioning

confidence: 99%

“…Nano-tracer planar laser scattering (NPLS) is a new flow visualization technique for measuring the fine structures of a supersonic flow. [24] In the present work, the supersonic flow over a double elliptic surface is experimentally investigated using NPLS and PIV techniques. The rest of the paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Imaging of supersonic flow over a double elliptic surface

Qing-hu¹,

Yi²,

He³

et al. 2013

Chinese Phys. B

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“…Sun et al 15 and Gao et al 16 have gained the structure and the complex shock system of the transverse jet flow field by numerical simulation method, respectively. Zhu Yang-zhu et al 17,18 revealed the fine structure of the flow field of two-dimensional and three-dimensional, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Zhu Yang-zhu et al 17,18 revealed the fine structure of the flow field of two-dimensional and three-dimensional, respectively.…”

Section: Introductionmentioning

confidence: 99%

Research on drag reduction performance of turbulent boundary layer on bionic jet surface

Zhao

Liu

2016

Proceedings of the Institution of Mechanical Engineers, Part M:

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Based on the fact that jet formed in outer gill of sharks can reduce the wall friction during the breath process, a bionic jet surface model was established. The numerical simulations were carried out using shear stress transport k2v model, and the simulation results accorded with that of experiments. First, in the case of fixed flow-velocity ratio, the drag reduction performance would be better with the smaller jet's angle, and the impact that the angle has on the drag reduction would be greater with the increase in jet hole's aperture. Second, in the case of fixed jet's angle, the drag reduction had a nearly linear relationship with flow-velocity ratio. Namely, the drag reduction would be better as the flow-velocity ratio increased, and the larger the jet hole's aperture, the better the drag reduction. In addition, compared with the case of smoothing surface, the flow structure in turbulent boundary layer was changed by jet, increasing the thickness of viscous bottom layer and decreasing the gradient of normal velocity perpendicular to wall. Finally, the drag reduction mechanism was proposed based on the increased velocity effect of turbulent core, isolation effect of wall and the increased turbulent damping effect.

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“…NPLS is a flow visualization technique [22] with a high temporal-spatial resolution and can reveal fine structures of supersonic flow. The NPLS technique has been successfully applied in the experimental investigation of boundary layers, [23] backward-facing steps, [24] finite cylinders, [25] blunt double-cones, [26] supersonic mixing layers, [27] and so forth.…”

mentioning

confidence: 99%

The Effect of Micro-ramps on Supersonic Flow over a Forward-Facing Step

Qing-hu¹,

Yi²,

Zhu³

et al. 2013

Chinese Phys. Lett.

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The effect of micro-ramp control on fully developed turbulent flow over a forward-facing step (FFS) is investigated in a supersonic low-noise wind tunnel at Mach number 3 using nano-tracer planar laser scattering (NPLS) and supersonic particle image velocimetry (PIV) techniques. High spatiotemporal resolution images and the average velocity profiles of supersonic flow over the FFS with and without the control of the micro-ramps are captured. The fine structures of both cases, including the coherent structures of fully developed boundary layer and the large-scale hairpin-like vortices originated from the micro-ramps as well as the interaction of shock waves with the large-scale structures, are revealed and compared. Based on the time-correlation images, the temporal and spatial evolutionary characteristics of the coherent structures are investigated. It is beneficial to understand the dynamic mechanisms of the separated flow and the control mechanisms of the micro-ramps. The size of the separation region is determined by the NPLS and PIV. The results indicate that the control of the micro-ramps is capable of delaying the separation and diminishing the extent of recirculation zone.

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Instantaneous and time-averaged flow structures around a blunt double-cone with or without supersonic film cooling visualized via nano-tracer planar laser scattering

Cited by 19 publications

References 30 publications

Imaging of supersonic flow over a double elliptic surface

Imaging of supersonic flow over a double elliptic surface

Research on drag reduction performance of turbulent boundary layer on bionic jet surface

The Effect of Micro-ramps on Supersonic Flow over a Forward-Facing Step

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