利用锥形孔板测量气液二相流量

Gas-liquid two-phase flow measurement with cone orifice plate

利用一种改进的防堵孔板和沿程管段的组合装置,基于考虑滑移比影响的均相流模型,应用伯努力方程和连续性方程推导出影响气液二相流干度的因素为p和Δp1-2/Δp3-4,建立了干度的测量模型;并通过支持向量机(SVM)以p和Δp1-2/Δp3-4作为输入变量,干度为输出值,得到干度的测量相对误差≤3.6%,在结合林氏流量测量模型后,在实验测量参数范围内,总质量流量的测量相对误差≤8.3%。实现了运用一个节流件完成流量的双参数测量,并完成了锥形孔板流出系数的标定和林氏模型中参数θ的拟合公式,分析得出它是影响林氏模型测量误差的重要因素。

Based on the homogenous-phase mode considering slip ratio, using a device combined straight tube and a modified anti-blocking orifice plate which can reduce permanent pressure loss and measure gas-liquid two-phase flow, the factors of p and Apl.JAp3.4 which affect the dryness of gas-liquid two-phase flow were derived by using Bernoulli equation and continuity equation. So it can obtain dryness by using support vector machine （SVM） to predict it. The relative error of dryness is below 3.6% ,and the relative error of the overall mass flow is below 8.3% based on Lin model. So it can only apply orifice plate to measure dryness and mass flow, and the calibration for discharge coefficient of cone orifice and the equation of parameter 0 in Lin model were obtained by experiment. It concludes that 0 is an important factor affecting the Lin model measurement error.