Tracking characteristics of tracer particles for PIV measurements in supersonic flows

Chen, Fang; Li, Hong; Yang, Zifeng; Hu, Hui

doi:10.1016/j.cja.2016.12.033

Cited by 18 publications

(14 citation statements)

References 19 publications

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“…The boundary layer in the experiment [17] is 2.5mm and the incoming flow velocity is 514m/s, so the characteristic time τf is 4.8μs. And the response time of the 1μm tracer particles can be accurately calculated by the following equation [38]:…”

Section: Measurement Methodsmentioning

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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Section: Measurement Methodsmentioning

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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“…The rotor wake in ground effect and its investigation in a wind tunnel using the PIV technique was presented in Reference [ 12 ]. References [ 13 , 14 ] provide examples of the application of the PIV technique for testing transonic and supersonic flows, where the accurate representations of the shock wave position and the wave shape were of great importance. In Reference [ 15 ], calibration tests of the nozzle in the tunnel were performed with Mach numbers equal to 3.5 and 4.5.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Flow Field Generated by Multicopter Propellers

Czyż¹,

Karpiński

Stryczniewicz

2020

Sensors

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This paper presents the results of research on the airflow around a multirotor aircraft. The research consisted of the analysis of the velocity field using particle image velocimetry. Based on the tests carried out in a wind tunnel, the distribution of the velocity and its components in the vertical plane passing through the propeller axis were determined for several values of the angle of attack of the tested object for two values of airflow velocity inside the tunnel, i.e., vwt = 0 m/s and vwt = 12.5 m/s. Determining the velocity value as a function of the coordinates of the adopted reference system allowed for defining the range of impact of the horizontal propellers and the fuselage of the research object itself. The tests allowed for quantitative and qualitative analyses of the airflow through the horizontal rotor. Particular attention was paid to the impact of the airflow and the angle of attack on the obtained velocity field distributions.

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“…The Stokes number was derived by calculating the time constant of the equation of motion of the particle. Equation ( A1 ) represents the equation of motion of the particles introduced into the flow field [ 58 ].

Here,

(Pa·s),

(m/s),

(kg/m 3 ) and

(m) represent the viscosity coefficient, particle velocity, velocity of measurement object, particle density and particle size, respectively.…”

mentioning

confidence: 99%

…”

mentioning

confidence: 99%

Design and Experimental Evaluation of an Odor Sensing Method for a Pocket-Sized Quadcopter

Shigaki

Fikri

Kurabayashi

2018

Sensors

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In this study, we design and verify an intake system using the wake of a pocket-sized quadcopter for the chemical plume tracing (CPT) problem. Solving CPT represents an important technique in the field of engineering because it can be used to perform rescue operations at the time of a disaster and to identify sources of harmful substances. An appropriate intake of air when sensing odors plays an important role in performing CPT. Hence, we used the air flow generated by a quadcopter itself to intake chemical particles into two alcohol sensors. By experimental evaluation, we verified that the quadcopter wake intake method has good directivity and can be used to realize CPT. Concretely, even at various odor source heights, the quadcopter had a three-dimensional CPT success rate of at least 70%. These results imply that, although a further development of three-dimensional CPT is necessary in order to conduct it in unknown and cluttered environments, the intake method proposed in this paper enables a pocket-sized quadcopter to perform three-dimensional CPT.

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Tracking characteristics of tracer particles for PIV measurements in supersonic flows

Cited by 18 publications

References 19 publications

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

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

Measurement of the Flow Field Generated by Multicopter Propellers

Design and Experimental Evaluation of an Odor Sensing Method for a Pocket-Sized Quadcopter

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