热液体动力扭带清洗动力学及其工程应用  

A DYNAMIC THEORY OF THE SELF-ROTATING AND FOULING PREVENTING TWISTED STRIP DRIVEN BY THERMOFLUID AND ITS ENGINEERING APPICATION

作　　者：蒋少青[1] 俞天兰[1] 彭德其[1] 俞秀民[1] 

机构地区：[1]湖南工业大学机械清洗研究所

出　　处：《力学与实践》2005年第4期42-46,共5页Mechanics in Engineering

基　　金：国家科技部火炬计划项目(99D231D7700584)教育部重点项目(00208)湖南省基金项目资助(02JJY2070)

摘　　要：为了解决传统扭带存在自转动力矩弱和传热强化幅度低的问题,研究入口反旋斜齿扭带的动力学理论,方法是将总动力矩分解为虚拟的光滑扭带动力矩和虚拟光滑扭带下的螺旋液流对斜齿的冲推力矩之和,运用动量矩定理分析建立了动力矩计算式.以此式指导结构优化和工程应用,使自转动力矩和传热系数均比传统扭带有了成倍提高,设备总阻力仍然在工程许可范围内,成为可以广泛应用于较低流迷下自动清洗防垢与高效强化传热的新元件.This paper gives a set of calculating formula of the driving force moment that is responsible for the tube-insert self-rotating and automatical cleaning in heat transfer tubes, using the principle of momentum moment and kinematics. It can be used to optimize the structure of the tube-insert with spiral flange. Based on the formula, several tube-inserts of different structure are designed and compared through experiments. The optimal insert （No. D） can be used reliably at low flowing velocity of more than 0.4 m/s. The driving force moment and heat transfer coefficient are increased by 141% and 50%, respectively. The flow resistance is in the limit of industrial standards.

关 键 词：热液体动力扭带 动力学 自动清洗功能 动力矩 光滑扭带 换热器 传热设备 

分 类 号：TK172[动力工程及工程热物理—热能工程]