差圧振動によるクオリティ推定(FR2 計測制御の最先端)

概要

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The oscillation of differential pressure (DP) in two-phase flow is very important not only for the design of heat exchangers but also for the estimation of flow behavior by detecting the vibration or noise transferred from components. The skilled engineers sometimes can determine the two-phase behavior with vibration or noise from components such as heat exchangers or steam generators. To understand the oscillation behavior and possibility to estimate the flow behavior, the air-water two-phase flow experiments were conducted with small vertical tubes of 1 to 10mm in inner diameter. The differential pressure was measured at the long observation span more than fifty times diameter to avoid the static pressure oscillation due the fluctuation of void fraction. The time-averaged value of DP was well predicted with the conventional correlations for pressure loss and void fraction. The FFT analysis on the oscillatory DP was conducted and the spectrum peak shifts due to the change of flow behavior were observed. The root mean square (RMS) value of DP was well correlated with Lockhart-Martinelli parameter. It was also demonstrated that the two-phase quality could be estimated with the proposed correlation for RMS values when the liquid flow rate and RMS value were known.
社団法人日本機械学会の論文
2004-06-22