| Project/Area Number |
12555048
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Fluid engineering
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
MIYAZATO Yoshiaki (2002) KYUSHU UNIVERSITY, Interdisciplinary Graduate School of Engineering Sciences, Associate Professor, 大学院・総合理工学研究院, 助教授 (30253537)
松尾 一泰 (2000-2001) 九州大学, 大学院・総合理工学研究院, 教授 (30037759)
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| Co-Investigator(Kenkyū-buntansha) |
KATANODA Hiroshi THE UNIVERSITY OF KITAKYUSHU, Faculty of Environmental Engineering, Lecturer, 国際環境工学部, 講師 (40336946)
HANDA Taro KYUSHU UNIVERSITY, Interdisciplinary Graduate School of Engineering Sciences, Research Associate, 大学院・理工学研究院, 助手 (30284566)
AOKI Toshiyuki KYUSHU UNIVERSITY, Interdisciplinary Graduate School of Engineering Sciences, Professor, 大学院・理工学研究院, 教授 (20150922)
NORIMATSU Yasufumi MITSUBISHI HEAVY INDUSTRIES, LTD., Hiroshima Research & Development Center, Researcher, 広島研究所, 主査(研究職)
宮里 義昭 九州大学, 大学院・総合理工学研究院, 助教授 (30253537)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥11,800,000 (Direct Cost: ¥11,800,000)
Fiscal Year 2002: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2001: ¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2000: ¥4,800,000 (Direct Cost: ¥4,800,000)
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| Keywords | Sootblower / Plug nozzle / Compound choking / Jet burner / High velocity oxygen coating / Supersonic jet / 超音速ノズル / 適正膨張 |
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| Research Abstract |
The purpose of the present investigation is to develop a supersonic plug nozzle system for high efficiency of industrial machinery including sootblowers, gas atomization, jet burner and high velocity oxygen fuel coatings. It has been clarified that the choking phenomena due to the confluence of the some streams in a single duct, i.e., compound flow choking phenomena are of importance to develop the supersonic plug nozzle system. Therefore, we have carried out a study on compound choking as well as on a plug nozzle. The conclusions obtained in the present study are summarized as the following.
(1)The characteristics of the overexpanded , correctly-expanded, and underexpanded flows from a plug nozzle have been qualitatively clarified by TVD numerical computations.(2)Flowfield around a circular cylinder placed in correctly-expanded supersonic jets has been studied. As the results, the pressure coefficient on the cylinder is found smaller than that obtained by potential flow theory around a cylinder, especially, when the cylinder is located in the potential core region of the jets. The velocity distribution on the cylinder strongly depends on the flow Mach number just downstream of the shock wave generated in front of the cylinder. (3)The critical pressure ratio across a convergent duct when the compound choking occurs at the duct exit were calculated by a simple flow model where the mixing of the two streams was taken into consideration. The calculated results agree well with the experimental data. (4)The form of the shock waves observed downstream of the duct exit when compound choking occurs is almost symmetric with respect to the duct centerline. TVD computation shows the same results with the experiments. (5)One can qualitatively explain compound choking phenomena by a one-dimensional theory of compound sound waves.
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