Hokkaido University · Engineering
노조무 하시모토 교수의 연구실은 초유체 헬륨의 난류 거동과 미세입자 운동을 중심으로 한 유체역학 및 연소역학 분야에서의 기초 연구를 수행하고 있습니다. 특히 초유체 헬륨에서의 비틀림 진동을 이용한 비틀림 라인 생성 및 난류 발생 메커니즘, 연소장 내 입자 궤적과 스모크 입자 크기 분포 측정 등 고해상도 실험 기법을 접목한 정밀한 현상 분석이 특징입니다. 또한 하이브리드 로켓의 연소 효율 향상을 위한 신개념 설계 기법 개발을 통해 응용 연구까지 확장하고 있습니다.
Figures are computed from collected data and may differ slightly.
Turbulence in boundary layers of superfluid $^{4}\mathrm{He}$ is studied using a vibrating wire. We developed a vortex filtering method for providing a superfluid practically free of remanent vortices in which a vibrating wire cannot generate turbulence. Based on this superfluid, we find that vortex lines are nucleated by cooling through the superfluid transition and remain forming bridges between the wire and a surrounding wall. Vibration of the wire causes instability of bridged vortex lines,
A three-dimensional numerical simulation is applied to a pulverized coal combustion field in a furnace equipped with three burners, and the trajectories of the coal particles with respect to each burner, which are hardly obtained experimentally, are also investigated in detail. Simulation results are compared with experimental results. The results show that the numerical and experimental results are consistent generally. Also, the examination of the particle trajectories shows that most of the u
To develop accurate models for the numerical simulation of coal combustion field, detailed experimental data using laser techniques, which can figure out the basic phenomena in a coal flame, are necessary. In particular, soot is one of the important intermediate substances in a coal flame. This paper is the first paper in the world reporting soot particle size distributions in a coal flame. The spatial distribution of the primary soot particle diameter were measured by the combination of the tim
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