Visualization of ambient air motion and entrainment into a transient gas jet impinging on a flat wall

Eiji Tomita; Yoshisuke Hamamoto; Hiroyuki Tsutsumi; Shiro Takasaki; Toru Watanabe; Sadami Yoshiyama

doi:10.4271/952513

Visualization of ambient air motion and entrainment into a transient gas jet impinging on a flat wall

Eiji Tomita, Yoshisuke Hamamoto, Hiroyuki Tsutsumi, Shiro Takasaki, Toru Watanabe, Sadami Yoshiyama

Research output: Contribution to journal › Conference article

9 Citations (Scopus)

Abstract

A turbulent gas jet impinging on a flat wall was visualized by a laser sheet method. Velocity fields were determined from the images with a high speed video system by processing them in terms of the cross correlation method for the jet and particle tracking method for the ambient air from the same images. The vortex flow near the transient jet tip impinging on the wall was visualized and analyzed successfully. The velocity field obtained from the above methods was compared to that determined with a laser Doppler anemometer. The path line of a certain period which was taken with a CCD camera with controlled shutter was analyzed and the mean rate of air entrainment was determined quantitatively. The spatial and temporal change of the entrainment rate was estimated and it was found that the entrainment rate near the upstream part of the jet tip region is larger because of the vortex.

Original language	English
Journal	SAE Technical Papers
DOIs	https://doi.org/10.4271/952513
Publication status	Published - Jan 1 1995
Event	Fuels and Lubricants Meeting and Exposition - Toronto, ON, Canada Duration: Oct 16 1995 → Oct 19 1995

ASJC Scopus subject areas

Automotive Engineering
Safety, Risk, Reliability and Quality
Pollution
Industrial and Manufacturing Engineering

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Tomita, E., Hamamoto, Y., Tsutsumi, H., Takasaki, S., Watanabe, T., & Yoshiyama, S. (1995). Visualization of ambient air motion and entrainment into a transient gas jet impinging on a flat wall. SAE Technical Papers. https://doi.org/10.4271/952513

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abstract = "A turbulent gas jet impinging on a flat wall was visualized by a laser sheet method. Velocity fields were determined from the images with a high speed video system by processing them in terms of the cross correlation method for the jet and particle tracking method for the ambient air from the same images. The vortex flow near the transient jet tip impinging on the wall was visualized and analyzed successfully. The velocity field obtained from the above methods was compared to that determined with a laser Doppler anemometer. The path line of a certain period which was taken with a CCD camera with controlled shutter was analyzed and the mean rate of air entrainment was determined quantitatively. The spatial and temporal change of the entrainment rate was estimated and it was found that the entrainment rate near the upstream part of the jet tip region is larger because of the vortex.",

author = "Eiji Tomita and Yoshisuke Hamamoto and Hiroyuki Tsutsumi and Shiro Takasaki and Toru Watanabe and Sadami Yoshiyama",

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AU - Tomita, Eiji

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AU - Watanabe, Toru

AU - Yoshiyama, Sadami

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N2 - A turbulent gas jet impinging on a flat wall was visualized by a laser sheet method. Velocity fields were determined from the images with a high speed video system by processing them in terms of the cross correlation method for the jet and particle tracking method for the ambient air from the same images. The vortex flow near the transient jet tip impinging on the wall was visualized and analyzed successfully. The velocity field obtained from the above methods was compared to that determined with a laser Doppler anemometer. The path line of a certain period which was taken with a CCD camera with controlled shutter was analyzed and the mean rate of air entrainment was determined quantitatively. The spatial and temporal change of the entrainment rate was estimated and it was found that the entrainment rate near the upstream part of the jet tip region is larger because of the vortex.

AB - A turbulent gas jet impinging on a flat wall was visualized by a laser sheet method. Velocity fields were determined from the images with a high speed video system by processing them in terms of the cross correlation method for the jet and particle tracking method for the ambient air from the same images. The vortex flow near the transient jet tip impinging on the wall was visualized and analyzed successfully. The velocity field obtained from the above methods was compared to that determined with a laser Doppler anemometer. The path line of a certain period which was taken with a CCD camera with controlled shutter was analyzed and the mean rate of air entrainment was determined quantitatively. The spatial and temporal change of the entrainment rate was estimated and it was found that the entrainment rate near the upstream part of the jet tip region is larger because of the vortex.

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