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方形旋风分离器内气固两相流湍流特性的研究

注意：本论文已在《热能动力工程》2002,17（2）:147-150发表
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苏亚欣1 岑可法2 骆仲泱2
（1：东华大学环境科学与工程学院，上海，200051；2：浙江大学热能工程研究所，杭州，310027）

摘 要: 应用三维颗粒动态分析仪（3D-PDA）对方形下排气旋风分离器内气固两相流场进行了实验研究。本文对流场、脉动速度、颗粒浓度、湍动能、湍流强度等的分布做了讨论。方形旋风分离器内的流动具有Rankine涡的特点，即中心部分为强制涡区，边壁附近是准自由涡区。边角处因颗粒/壁面间的相互碰撞引起的准层流运动使得颗粒湍流脉动强烈，湍流动能和局部湍流强度在边角附近取得较大值，表明在这里两相流消耗了气流的能量较多，是造成分离器压力损失的主要区域之一。边角有利于颗粒分离，主要原因是脉动强烈，消耗了颗粒和气流的旋流运动的动能。研究结果为结构优化提供了基础数据，并为今后的数值模拟研究提供了实验对比。
　
关键词: 方形下排气分离器 气固两相湍流运动 三维颗粒动态分析仪（3D-PDA）

Experimental study on the turbulent characteristics of the gas-solid suspension in a square cyclone separator

Yaxin Su1 Kefa Cen2 Zhongyang Luo2
( 1: College of Environmental Science and Engineering, Donghua University, Shanghai, 200051; 2: Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027 )

Abstract:Three-dimensional Particle Dynamics Analyzer was employed to study the gas-solid flow in a square-shaped cyclone separator which was designed for large CFB application. Distribution of flow vector, fluctuating velocity, turbulent kinetic energy ,turbulent intensity and particle concentration were discussed. The swirling flow inside the cyclone showed the Rankine vortex characteristics, i e, strong swirling vortex at the central region of the cross-section and weak swirling quasi-free vortex near the wall. The quasi-laminar motion of particles at the corners due to particle-particle/wall collision enhanced the turbulent movement there, which led to the local peak value of the turbulent kinetic energy and turbulent intensity. The corner is one of the major region to cause pressure drop because the suspension at the corners consumed more energy of the flow. The corners were found to be beneficial to particle separation mainly because the strong fluctuating flow consumed much of the kinetic energy of both the particle and gas.
Keywords: square-shaped cyclone separator; heat transfer model

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1、方形旋风分离器内颗粒浓度分布特性的实验研究

2、方形分离器内部两相流场的PDA实验研究

3、循环流化床颗粒团更新传热模型的修正

4、方形冷却型分离器内壁面和两相流间的传热理论模型

5、钉肋肋列传热的最小熵产优化分析

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