| A Study of Under-expanded Moist Air Jet Impinging on a Flat Plate |
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| 作者姓名： | Yumiko OTOBE Shigeru MATSUO Masanori TANAKA Hideo KASHIMURA Heuy-Dong KIM Toshiaki SETOGUCHI |
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| 作者单位： | Department of Control and Information Systems Engineering Kitakyushu National College of Technology，5-20-1，Shii，Kokuraminami-ku，Kitakyushu-shi，Fukuoka 802-0985，Japan，Department of Mechanical Engineering，Saga University，1，Honjo-machi，Saga-shi，Saga 840-8502，Japan，Department of Mechanical Engineering，Saga University，1，Honjo-machi，Saga-shi，Saga 840-8502，Japan，Department of Control and Information Systems Engineering，Kitakyushu National College of Technology，5-20-1，Shii，Kokuraminami-ku，Kitakyushu-shi，Fukuoka 802-0985，Japan，School of Mechanical Engineering，College of Natural Science，Andong National University，388，Song Cheon Dong，Andong，Kyung Pook，Korea，Department of Mechanical Engineering，Saga University，1，Honjo-machi，Saga-shi，Saga 840-8502，Japan |
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| 摘 要： | When a gas expands through a convergent nozzle in which the ratio of the ambient to the stagnation pressures is higher than that of the critical one, the issuing jet from the nozzle is under-expanded. If a flat plate is placed normal to the jet at a certain distance from the nozzle, a detached shock wave is formed at a region between the nozzle exit and the plate. In general, supersonic moist air jet technologies with non-equilibrium condensation are very often applied to industrial manufacturing processes. In spite of the importance in major characteristics of the supersonic moist air jets impinging to a solid body, its qualitative characteristics are not known satisfactorily. In the present study, the effect of the non-equilibrium condensation on the under-expanded air jet impinging on a vertical flat plate is investigated numerically in the case with non-equilibrium condensation, frequency of oscillation for the flow field becomes larger than that without the non-equilibrium condensation, and amplitudes of static pressure become small compared with those of dry air. Furthermore, the numerical results are compared with experimental ones.
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| 关 键 词： | 潮湿空气 射流 喷射碰撞 压力流程 非平衡浓缩 |
| 收稿时间： | 28 August 2005 |
A study of under-expanded moist air jet impinging on a flat plate |
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| Yumiko OTOBE,Shigeru MATSUO,Masanori TANAKA,Hideo KASHIMURA,Heuy-Dong KIM,Toshiaki SETOGUCHI.A Study of Under-expanded Moist Air Jet Impinging on a Flat Plate[J].Journal of Thermal Science,2005,14(4):334-340. |
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| Authors: | Yumiko Otobe Shigeru Matsuo Masanori Tanaka Hideo Kashimura Heuy-Dong Kim Toshiaki Setoguchi |
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| Affiliation: | (1) Department of Control and Information Systems Engineering, Kitakyushu National College of Technology, 5-20-1, Shii, Kokuraminami-ku, Kitakyushu-shi, 802-0985 Fukuoka, Japan;(2) Department of Mechanical Engineering, Saga University, 1, Honjo-machi, Saga-shi, 840-8502 Saga, Japan;(3) School of Mechanical Engineering, College of Natural Science, Andong National University, 388, Song Cheon Dong Andong, Kyung Pook, Korea |
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| Abstract: | When a gas expands through a convergent nozzle in which the ratio of the ambient to the stagnation pressures is higher than that of the critical one, the issuing jet from the nozzle is under-expanded. If a flat plate is placed normal to the jet at a certain distance from the nozzle, a detached shock wave is formed at a region between the nozzle exit and the plate. In general, supersonic moist air jet technologies with non-equilibrium condensation are very often applied to industrial manufacturing processes. In spite of the importance in major characteristics of the supersonic moist air jets impinging to a solid body, its qualitative characteristics are not known satisfactorily. In the present study, the effect of the non-equilibrium condensation on the under-expanded air jet impinging on a vertical flat plate is investigated numerically in the case with non-equilibrium condensation, frequency of oscillation for the flow field becomes larger than that without the non-equilibrium condensation, and amplitudes of static pressure become small compared with those of dry air. Furthermore, the numerical results are compared with experimental ones. |
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| Keywords: | compressible flow non-equilibrium condensation unpinging jet simulation |
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