渦による変動揚力を利用した質量流量計

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  • Mass Flowmeter Using Fluctuating Lift Caused by Vortex
  • ウズ ニ ヨル ヘンドウ ヨウリョク オ リヨウシタ シツリョウ リュウリョウ

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The indirect mass flowrate masurement has been widely used, combining volumetric flowmeters with temperature and/or pressure compensation of fluid density.<br>Meanwhile, this approach has such disadvantages as complicated compensating algorithm and the restriction that the approach is only applicable to ideal gases, except for highly pressurised gases, etc.. Mass flowmeter for direct mass flow measurement is more suitable to overcome these defects.<br>The authors propose one of the direct mass flow measurement approach, applying vortex flowmeter. That is to say, Karman vorteces are generated by a vortex shedder and fluctuating lift and its frequency are detected by the stress sensors built in the vortex shedder. The amount of the lift is divided by the frequency to yield signals proportional to mass flowrate.<br>The proposed sensing approach features simplicity both in principle and in sensor constuction.<br>As a result of applying this approach to water, air, and heavy oil, satisfactory results are obtained.

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