光纤-激光测定循环湍动流化床关键截面的气-固两相流动特性

发布时间：2018-03-13 12:40

本文选题：光纤-激光　切入点：循环湍动流化床　出处：《激光杂志》2017年12期 　论文类型：期刊论文

【摘要】：针对循环湍动流化床关键截面的气-固两相流动特性测定缺乏相应的理论作为依据,测定的准确度低,影响循环湍动流化床的应用,导致气固之间传质传热性能差问题,提出一种利用激光-光纤对循环湍动流化床关键截面气固两相流动特性进行测定的方法,通过利用Diaspora曳力模型计算流体曳力、利用经验关系式计算气固对流传热通量,并采用中心探测法实现对循环湍动流化床关键截面中空隙率的计算,以流体曳力、气固对流传热通量、以及空隙率的计算结果为依据,建立循环湍动流化床关键截面气-固两相流动的动力学模型,在此基础上,利用有线容积法,确定循环湍动流化床关键截面气-固两相流动对流扩散问题的控制方程,提高循环湍动流化床关键截面的气-固两相流动特性测定的准确度。实验结果表明,本文所提方法能够准确实现对循环湍动流化床关键截面中气-固颗粒的流动特性测定,完成对气-固两相流动特性的测定。
[Abstract]:The measurement of gas-solid two-phase flow characteristics of critical section of circulating turbulent fluidized bed is based on the lack of relevant theory, and the accuracy of measurement is low, which affects the application of circulating turbulent fluidized bed and leads to poor heat transfer performance between gas and solid. A method of measuring the gas-solid two-phase flow characteristics of the critical section of a circulating turbulent fluidized bed using laser-fiber is presented. The fluxes of gas-solid convection are calculated by using the Diaspora drag model and the empirical equation. The central detection method is used to calculate the voidage in the critical section of the circulating turbulent fluidized bed, which is based on the results of fluid drag, gas-solid convection heat transfer flux and voidage. The dynamic model of gas-solid two-phase flow in critical section of circulating turbulent fluidized bed is established. Based on this model, the governing equation of convection-diffusion problem of gas-solid two-phase flow in critical section of circulating turbulent fluidized bed is determined by using wired volume method. The experimental results show that the proposed method can accurately measure the flow characteristics of gas-solid particles in critical sections of circulating turbulent fluidized beds. The gas-solid two-phase flow characteristics have been determined.
【作者单位】：四川理工学院过程装备与控制工程四川省高校重点实验室;
【基金】：四川省科技支撑计划(2015GZ0037) 四川省重点实验室开放基金(GK201608) 四川理工学院创新基金(y2016018)
【分类号】：TQ051.13

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