垂直上升气液两相流中三角形柱体两相斯托拉赫数的研究

Study of Gas-Liquid Two-Phase Strouhal Number for Triangle Cylinder in Vertically Upward Gas-Liquid Two Phase Flow

本文试验研究了两种规格三角形柱体,在垂直上升气液两相流中,发生气液两相涡街时,气液两相斯托拉赫数的变化规律。在测得大量数据的基础上,得出了发生气液两相涡街时,气液两相斯托拉赫数的通用关系式,研究表明,气液两相斯托拉赫数在两相工况下为一变数,与来流截面含气率、涡街发生体形状和特征尺寸、来流方向等因素有关。应用此关系式。

In this paper, the Strouhal number of two normal triangle cylinders, occuring in gas liquid two phase vortex street (the Karmen vortex street), are studied experimentally in vertically upward gas liquid two phase flow. On the basis of a large number of experimental data, a universal equation for gas liquid two phase vortex street is obtained. Results show that the two phase Strouhal number is a variable and is influenced by void fraction, body shape, body size and flow direction etc. By using this equation, according to the two phase vortex street frequency, the vortex street emission can be used as an element for measuring the two phase flowrate or components.