2003 Fiscal Year Final Research Report Summary
Development of Air Jet Retrieval System of Gravel Scattered on Frozen Road Surface for Slip Prevention
| Project/Area Number |
14550137
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Kitami Institute of Technology |
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Principal Investigator |
MIYAKOSHI Katsumi Kitami Institute of Technology, Faculty of Engineering, Research Assistant, 工学部, 助手 (00142795)
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| Co-Investigator(Kenkyū-buntansha) |
HANIU Hiroyuki Kitami Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (70172955)
SUZUKI Soichiro Kitami Institute of Technology, Faculty of Engineering, Associate Professor, 工学部, 助教授 (30250541)
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| Project Period (FY) |
2002 – 2003
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| Keywords | Blow off Jet / Gravel / Frozen Road Surface / Slip Prevention / Jet Velocity / Blow off Distance / Retrieval System / Saltation |
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| Research Abstract |
Development of retrieval system of the gravel scattered on the road surface for slip prevention by means of recirculation type air jet is conducted. The purpose of this study is to clarify the optimum installation condition of the blow off jet nozzle and the suction nozzle for the gravel retrieval. The height of the blow off jet nozzle exit was h=5mm, and the width was 50mm. The inlet height of the suction nozzle was h=13mm, and the width was 90mm.The sealing jet nozzle which push back the gravel going through the gap between the road surface has been installed behind the suction nozzle. In changing blowing angle θ of the jet and standoff distance from the road surface y_0, the blow off regions of the gravel were photographed and velocity distributions over the road surface were measured by hot-wire anemometer.
As the result, optimum installation condition of the blow off jet nozzle were found to be y_0/h=3 and θ=15°, where the blow off distance of gravel is increased. The other results areas follows.
1) It is possible to estimate the blow off region of the dry gravel on the road surface from the jet velocity contour line of 10m/s measured at 1.5mm above the road surface.
2) The effect of ceiling installation for dustproof on the blow off distance was found to be small. How ever the blow off distance of the gravel is increased, when the sidewall was installed parallel to the centerline of the jet.
3) By the hydrodynamic force of the blow off jet, the gravel moves in rolling and saltation over the road surface.
4) The sealing jet can suppress the anti-acquisition rate of the gravel below 3%, when the gap between suction nozzle and road surface is less than 4mm.
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