Investigation of Mach number effects on flow over a flat plate at Reynolds number of 1.0 × 104by schlieren visualization

Kensuke Kusama; Takayuki Nagata; Masayuki Anyoji; Taku Nonomura; Keisuke Asai; Takayuki Nagata

doi:10.1088/1873-7005/abe04c

Investigation of Mach number effects on flow over a flat plate at Reynolds number of 1.0 × 10⁴by schlieren visualization

Kensuke Kusama, Takayuki Nagata, Masayuki Anyoji, Taku Nonomura, Keisuke Asai, Takayuki Nagata

ENG - Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Flow over a flat plate with a 5% thickness ratio is investigated by schlieren visualization in compressible low-Reynolds-number conditions. The results show that flow separates at the leading-edge and laminar separation-bubble forms. The position of the maximum root mean square of the schlieren image which is related to the position of the vortex shedding moves downstream as a Mach number increases. Furthermore, the two-dimensional structure of generated vortices is maintained up to the trailing edge at the Mach number of 0.66. The frequency analysis of the time-series intensity value of the schlieren images also shows that the flow is stabilized with increasing the Mach number. The position of the end of the pressure plateau region matches the position where the root-mean-square value of the intensity image becomes a maximum due to vortex shedding.

Original language	English
Article number	015513
Journal	Fluid Dynamics Research
Volume	53
Issue number	1
DOIs	https://doi.org/10.1088/1873-7005/abe04c
Publication status	Published - 2021 Feb

Keywords

Compressible flow
Laminar separation bubble
Low reynolds number

ASJC Scopus subject areas

Mechanical Engineering
Physics and Astronomy(all)
Fluid Flow and Transfer Processes

Access to Document

10.1088/1873-7005/abe04c

Cite this

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title = "Investigation of Mach number effects on flow over a flat plate at Reynolds number of 1.0 × 104by schlieren visualization",

abstract = "Flow over a flat plate with a 5% thickness ratio is investigated by schlieren visualization in compressible low-Reynolds-number conditions. The results show that flow separates at the leading-edge and laminar separation-bubble forms. The position of the maximum root mean square of the schlieren image which is related to the position of the vortex shedding moves downstream as a Mach number increases. Furthermore, the two-dimensional structure of generated vortices is maintained up to the trailing edge at the Mach number of 0.66. The frequency analysis of the time-series intensity value of the schlieren images also shows that the flow is stabilized with increasing the Mach number. The position of the end of the pressure plateau region matches the position where the root-mean-square value of the intensity image becomes a maximum due to vortex shedding. ",

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author = "Kensuke Kusama and Takayuki Nagata and Masayuki Anyoji and Taku Nonomura and Keisuke Asai and Takayuki Nagata",

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T1 - Investigation of Mach number effects on flow over a flat plate at Reynolds number of 1.0 × 104by schlieren visualization

AU - Kusama, Kensuke

AU - Nagata, Takayuki

AU - Anyoji, Masayuki

AU - Nonomura, Taku

AU - Asai, Keisuke

AU - Nagata, Takayuki

PY - 2021/2

Y1 - 2021/2

N2 - Flow over a flat plate with a 5% thickness ratio is investigated by schlieren visualization in compressible low-Reynolds-number conditions. The results show that flow separates at the leading-edge and laminar separation-bubble forms. The position of the maximum root mean square of the schlieren image which is related to the position of the vortex shedding moves downstream as a Mach number increases. Furthermore, the two-dimensional structure of generated vortices is maintained up to the trailing edge at the Mach number of 0.66. The frequency analysis of the time-series intensity value of the schlieren images also shows that the flow is stabilized with increasing the Mach number. The position of the end of the pressure plateau region matches the position where the root-mean-square value of the intensity image becomes a maximum due to vortex shedding.

AB - Flow over a flat plate with a 5% thickness ratio is investigated by schlieren visualization in compressible low-Reynolds-number conditions. The results show that flow separates at the leading-edge and laminar separation-bubble forms. The position of the maximum root mean square of the schlieren image which is related to the position of the vortex shedding moves downstream as a Mach number increases. Furthermore, the two-dimensional structure of generated vortices is maintained up to the trailing edge at the Mach number of 0.66. The frequency analysis of the time-series intensity value of the schlieren images also shows that the flow is stabilized with increasing the Mach number. The position of the end of the pressure plateau region matches the position where the root-mean-square value of the intensity image becomes a maximum due to vortex shedding.

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KW - Laminar separation bubble

KW - Low reynolds number

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