| Project/Area Number |
04555040
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| Research Category |
Grant-in-Aid for Developmental Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Fluid engineering
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| Research Institution | Tohoku University |
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Principal Investigator |
KOBAYASHI Ryoji Tohoku Univ., Faculty of Engineering, Prof., 工学部, 教授 (70006170)
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| Co-Investigator(Kenkyū-buntansha) |
HORIUCHI Takeshi Daikin Industries, Ltd., Chief Engineer, 油機事業部, 室長
FUKUNISHI Yu Tohoku Univ., Faculty of Eng., Assoc.Prof., 工学部, 助教授 (60189967)
SHOJI Tetsuo Tohoku Univ., Faculty of Engineering, Prof., 工学部, 教授 (80091700)
TAKAYAMA Kazuyoshi Tohoku Univ., Inst.of Fluid Science, Prof., 流体科学研究所, 教授 (40006193)
SHIMA Akira Tohoku Univ., Inst.of Fluid Science, Prof., 流体科学研究所, 教授 (30006168)
小曽戸 博 ダイキン工業(株), 油機事業部, 主任研究員
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥8,600,000 (Direct Cost: ¥8,600,000)
Fiscal Year 1993: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1992: ¥6,100,000 (Direct Cost: ¥6,100,000)
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| Keywords | Water Jet / Abrasive Jet / Cutting Processing / Nozzle / Multiphase Flow / Impact Fracture |
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| Research Abstract |
The water jet technology is applied to the special processing of metallic and non-metallic materials, the high pressure cleaning and the dismounting of buildings. The objective of the present research is to find the processing characteristics of the water jet for different metallic and non-metallic materials. The main results obtained are as follows :
1. The experiments of abrasive jet cutting were carried out for different solid materials. Wave analysis was made for stripe-pattern roughness which appeared on the cutting surfaces. The appearance of the striation is closely related with the accuracy of cutting processing. After systematic experiments, the most suitable condition of the cutting processing was found, in which the roughness due to the striation remains less as much as possible.
2. The velocity of the abrasives, which were accelerated by the water jet, was successfully measured by using two sets of the photography system. The velocity was more than 80% of the water jet velocity. The present theoretical consideration supported the experimental results.
3. The pressure in the nozzle head was measured under different cutting conditions.
4. The best condition for the acceleration of the abrasives was found in the case of the abrasive nozzle diameter 3 times the water nozzle diameter, where the cutting ability was also in the best condition.
5. It was found that the abrasives reduced markedly to smaller particles in the abrasive nozzle.
6. The appearance of the striation on the cutting surface was simulated theoretically.
7. The possibility and the problems were considered to apply the water jet cutting for soft materials such as marine products and vegetables.
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