Progressive improvement in the dynamic characteristics of thermofluid sensors by adaptive response compensation techniques and its application to the visualization of velocity and temperature fields

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K06117
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Thermal engineering
• Research Institution: Nagoya Institute of Technology
• Principal Investigator: TAGAWA Masato 名古屋工業大学, 工学(系)研究科(研究院), 教授 (80163335)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 熱流体計測 / 可視化計測 / 温度センサ / 熱電対 / 熱線流速計 / 画像計測 / 温度分布 / 速度分布

Outline of Final Research Achievements

A novel measurement technique called a “fluid temperature-field scanner” has been developed. This technique enables us to visualize the spatial temperature distribution of a non-isothermal fluid flow by tracking the trajectory of a rod-like probe equipped with many temperature sensors by using a high-speed CCD camera. The key technique is an adaptive response-compensation scheme by which the response lag of the temperature sensors can be adequately compensated to reconstruct the temperature profile accurately.
Furthermore, a new measurement technique to visualize the spatial “velocity” distribution of an inhomogeneous flow field has been proposed. In the same manner as the fluid temperature-field scanner, a two-dimensional velocity profile can be visualized quantitatively. The rod-type probe consists of ten hot-wires operated by the constant-temperature anemometers. It is demonstrated that an inhomogeneous velocity field of an air jet flow can be visualized readily and accurately.

Free Research Field

熱流体工学，乱流伝熱．乱流輸送現象，熱流体計測，乱流モデル

Academic Significance and Societal Importance of the Research Achievements

気流の速度や温度の分布をその場で簡単に可視化できれば，熱流体が関与する機器の開発設計や性能評価に役立つだけでなく，機器の設置や設定等の様々な場面で有用な情報を得ることができる．熱電対，抵抗線，サーミスタ等の温度センサや熱線流速計は接触法ではあるが，散乱粒子や蛍光物質等を流体中に導入する必要がなく，安全かつ簡便に計測できる点で優れている．このようなことが背景にあり，レーザ応用計測などの高価で複雑なシステムによらずに熱流動を簡便に可視化できる計測法を実現することは，熱流体機器の研究開発のスピードを高めるだけでなく，点検や整備などの日常業務の効率向上と負荷軽減にも大きく寄与する期待される．