OS9-09 マルチウェイブ超音波流速分布計測法を用いた気液二相流動計測の試み : 第2報:相関法を用いた気泡上昇速度分布計測の高度化(OS9 動力エネルギーシステムにおける熱流動)

概要

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This paper proposes a new measurement technique for multi-phase flow. To measure two kinds of phases at the same place and the time. Multi-wave TDX was newly developed. This TDX includes the two different ultrasonic elements. Applying the effects of measuring volume, the liquid velocity and me bubbles' rising velocity are obtained using the UDM in two-phase bubbly flow. Furthermore, applying ultrasound correlation method (UTDC) for the Multi-wave TDX, the bubbles' rising velocity can be obtained at more accurately. With emitting two kinds of ultrasonic at the same time, two different signals can be obtained. Comparing with the each signal, the bubbles' velocity information can be eliminated from the other signal. Using the UTDC and the signal comparison method, the velocity distribution can be obtained at the same time and the position. This method does not need the velocity difference between two objects, such as the bubbles and the liquid. Hence, this method can be applied for other multi-phase flow.
2005-06-28