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1996 Fiscal Year Final Research Report Summary

STUDY ON PREVENTION OF SNOW SMOKE BEHIND TRUCKS IN COLD REGIONS

Research Project

Project/Area Number 07455088
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionHOKKAIDO UNSTITUTE OF TECHNOLOGY

Principal Investigator

TOYODA Kuniaki  INSTITUTION,DEPARTMENT,TITLE OF POSITION Hokkaido Institute of Technology, Faculty of Engineering, Professor, 工学部・機械工学科, 教授 (50048039)

Co-Investigator(Kenkyū-buntansha) SHIRAHAMA Yoshikuni  INSTITUTION,DEPARTMENT,TITLE OF POSITION Hokkaido Institute of Technology, Facul, 機械工学科, 助教授 (30048061)
Project Period (FY) 1995 – 1996
KeywordsCold regions / Trucks / Smoke of snow / Vortex / Spoiler / Three-dimensional perturbation
Research Abstract

The object of the research project is to make clear the generating mechanism of snow smoke behind trucks in cold regions in winter season, and to obtain the basic ideas to prevent the generation of snow smoke. The experimental work was carried out by using wind tunnels, and the results are as follows.
1. The evolution of large-scale vortices behind a model truck was confirmed by the visualization techniques in wind tunnel. The large-scale vortices generate the snow smoke behind trucks.
2. In order to prevent the evolution of large-scale vortices, the spoiler with three-dimensional roughness at the trailing edge was attached under the truck. The three-dimensional perturbation was very effective to break up the large-scale vortices, and the spoiler is a useful device to prevent the snow smoke.
3. The velocity fields behind the model truck on the moving belt were measured by hot-wire anemometer, and the suppression of turbulence intensity and large-scale vortices was confirmed quantitatively.
4. The above-mentioned spoiler was installed to an actual truck, and the performance of the spoiler was checked by the driving test. The result snows that the spoiler is very effective to prevent the mud adhesion to the rear surface of the truck, suggesting the suppression of the large-scale vortices behind the truck.
5. The technique to detect the three-dimensional vortical structures was developed : the complicated vortical structure in a rectangular jet was educed by the measurements of pressure fluctuations. The technique is useful to make clear the details of the vortex motions behind the spoiler.
The present work suggested the basic ideas to prevent the snow smoke behind trucks, and the further study is needed to develop the ideas.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 平元理峰: "長方形噴流中の三次元渦構造に関する研究" 日本機械学会論文集(B編). 62・598. 2202-2207 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 平元理峰: "励起された長方形噴流の拡散促進機構に関する研究" 日本機械学会論文集(B編). 63・605. 101-105 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 豊田国昭: "圧力・速度同時測定に関する研究" 日本機械学会講演論文集. 96-9. 59-60 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 豊田国昭: "励起された長方形噴流中の渦構造と拡散促進機構" 乱流の解明と制御に関するシンポジウム講演論文集. (発表予定). (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 豊田国昭: "噴流中の渦の挙動と制御" ターボ機械. 25・9(発表予定). (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 豊田国昭: "大型車両走行に伴う雪煙に関する研究" 混相流シンポジウム'97講演論文集. (発表予定). (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] R.Hiramoto: "Three-Dimensional Vortical Structures in a Rectangular Jet" Trans.of the JSME. 62-598. 2202-2207 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] R.Hiramoto: "Diffusion Enhancement Mechanism of an Excited Jet" Trans.of the JSME. 63-605. 101-105 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Toyoda: "Simultaneous Measurements of Fluctuating Static-Pressure and Velocity" Proc.of the JSME meeting. 96-9. 59-60 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Toyoda: "Vortical Structure and Diffusion Enhancemnet Mechanism in an Excited Rectangular Jet" Proc.of Symp.on the Investigation and Control of Turbulent flows. (to be appeared). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Toyoda: "Motions and Control of Vortices in Jets" Turbomachinery. 25-9 (to be appeared). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Toyoda: "Study on Snow Smoke behind Trucks" Proc.of Symp.on Multiphase flows '97. (to be appeared). (1997)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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