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Specific signal imaging velocimetry for rarefied plasma flows

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Abstract

High-velocity and rarefied plasma flow has found great application in aerospace science and technology. However, it is difficult to characterize such a flow using traditional methods based on the continuous medium flow hypothesis. With principles similar to those of particle imaging velocimetry, a specific signal imaging velocimetry method is proposed to measure the fluid velocity. Instead of using tracing particles, a specific signal was used as a fingerprint, which facilitated better fluid followability and measurement accuracy. As a verification example, the axial velocity distribution of a plasma plume along the flow direction was experimentally measured. The results agreed well with intrusive electrostatic probe measured values, which shows that SSIV has a great potential for fast and two-dimensional velocity measurements in similar flows. Considering the abilities and requirements of the experimental equipment and the signal processing techniques, the applicability of the proposed specific signal imaging velocimetry method was discussed.

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Abbreviations

A :

Amplitude

D :

Diameter

f :

Frequency

I :

Intensity

L :

Characteristic length

m :

Integer number

n :

Integer number

N :

Integer number

px :

Pixel

r :

Radial position

t :

Time

U :

Velocity of fluid flow

v :

Environmental velocity

w :

Width

x :

Axial position

ε :

Dissipation rate per unit mass

μ :

Viscosity

ρ :

Density

τ :

Characteristic time

υ :

Kinematic viscosity

φ :

Phase of a signal

CCD:

Charge-coupled device

DC:

Direct current

FFT:

Fast Fourier transformation

FOV:

Field of view

MTV:

Molecular tagging velocimetry

OSR:

Object space resolution

PIV:

Particle imaging velocimetry

RF:

Radio frequency

SSIV:

Specific signal imaging velocimetry

WD:

Working distance

0 :

Initial value

∞ :

Infinite value

a :

Camera

i :

Index number in axial direction

j :

Index number in radial direction

max:

Maximum value

min:

Minimum value

p :

Particle

px :

Pixel

s :

Specific signal

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Acknowledgements

This work was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA17030100) and the National Natural Science Foundations of China under Grant 11735004 and Grant 11575273.

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Authors and Affiliations

  1. State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China

    Jinwen Cao, Heji Huang, Wenxia Pan, Xian Meng & Chengkang Wu

  2. School of Engineering Science, University of Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China

    Heji Huang, Wenxia Pan & Chengkang Wu

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  1. Jinwen Cao
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  2. Heji Huang
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  3. Wenxia Pan
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Correspondence to Heji Huang.

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Cao, J., Huang, H., Pan, W. et al. Specific signal imaging velocimetry for rarefied plasma flows. Exp Fluids 61, 247 (2020). https://doi.org/10.1007/s00348-020-03080-9

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