扰流管束振荡流动强化换热研究

项目名称： 扰流管束振荡流动强化换热研究

项目编号： No.51306121

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 能源与动力工程

项目作者： 王治云

作者单位： 上海理工大学

项目金额： 25万元

中文摘要： 当流动不稳定和有一定扰流结构下，流体流动会形成偏斜流动或者自维持振荡，这是一种由系统内部的非线性本质引起的现象。这种在初始及边界条件完全均匀对称的情况下产生的自维持振荡在许多工业应用都曾出现，对该现象的研究具有重要意义。本项目通过数值模拟与实验相结合来研究流体自维持振荡现象出现的条件，形成和发展的过程及其对传热的影响，以及由自维持振荡引发的强化传热。数值模拟是研究流动非线性特征的有效方法，但数值模型的实验验证是研究工作进行的重要保证。实验采用采用激光干涉的方法测试流体的温度场，用烟可视化方法显示流场，由红外热像仪测量固体表面温度场。经过验证的数值模型可以研究多种参数下的自维持振荡流动与传热的特点，尤其是入口雷诺数从小到大的变化过程中也就是流动从层流向湍流发展过程中自维持振荡的产生、发展及其对流动和传热的影响，以及由自维持振荡引发的强化传热的机理。

中文关键词： 扰流圆管；强化传热；非线性特性；；

英文摘要： When the flow is instable or there is some spoiler structure in the flow field, the fluid flow will probably be asymmetric or be self-sustained oscillating. This is a phenomenon caused by the nonlinear nature of the system. Self-sustained oscillations occur in many industrial applications, in which cases initial and boundary conditions are completely steady and symmetrical, and the studies on the phenomenon is of great significance. The objective of this project is to investigate the conditions of the formation and development process of self-sustained oscillation as well as its impact on the flow and heat transfer by numerical simulation and experiment, and to study the heat transfer enhancement caused by the oscillation. The numerical simulation is an effective method to study the nonlinear characteristics of the flow, and the experimental validation of the numerical model is an important guarantee of the research work. For experiment, laser interferometry will be used to measure the temperature field; Smoke flow visualization method will be employed to visualize the flow field; Thermography will be used to record the temperature of the solid surface. The heat transfer and flow characteristics of self-sustained oscillation flow beyond the experimental conditions could be studied by validated numerical model, i

英文关键词： Fflow across the tubes；Heat transfer enhancement；Nonlinear characteristic；；