翅片管式换热器表面颗粒物沉积规律研究

发布时间：2018-04-01 00:24

本文选题：翅片管式换热器　切入点：颗粒物　出处：《西安建筑科技大学》2013年硕士论文

【摘要】：翅片管式换热器是空调系统的重要设备之一。颗粒物在翅片管式换热器表面的沉积，不仅影响翅片管换热器的换热效率，而且会间接影响室内空气品质。通过研究颗粒物在翅片管换热器表面的沉积规律，可以为减少颗粒物沉积提供可靠的理论依据，同时对翅片管换热器的结构改造，以及清洗工作具有现实意义。本文利用模拟和实验方法，对颗粒物在翅片管换热器表面的沉积规律进行研究。并且结合实际情况，，对降低翅片管换热器表面颗粒物沉积提出相关建议。采用模拟方法对不同粒径的颗粒物在平直型翅片管换热器表面的沉积特性进行研究，分析不同粒径颗粒物在翅片间的运动轨迹，以及在翅片管换热器表面的沉积率。结果显示，在低风速1~3m/s范围内，粒径在1~10μm之间的颗粒物轨迹呈现光滑曲线型，气流的湍流脉动对颗粒物影响很大；粒径大于50μm的颗粒物，随着风速增加，惯性力起到主要作用，轨迹呈现直线型，沉积率也增加。不同风速和翅片间距对颗粒物的沉积影响也较大。在1~6m/s风速范围内，10μm的颗粒物随着风速增加，颗粒物沉积率减小；50μm颗粒物，在1~3m/s风速范围内，随着风速增加沉积率减小，在4~6m/s风速范围内，随着风速增加沉积率增加。并且通过模拟得出，翅片间距越大，粒径大于20μm的颗粒物沉积率越大，粒径小于10μm的颗粒物沉积率越小。本文通过实验对模拟得出的颗粒物沉积规律进行了验证，证明了模拟的可行性和准确性。并对控制颗粒物在翅片管式换热器表面沉积提出相关建议。
[Abstract]:Finned tube heat exchanger is one of the important equipments in air conditioning system.The deposition of particulate matter on the surface of finned tube heat exchanger not only affects the heat transfer efficiency of finned tube heat exchanger, but also indirectly affects indoor air quality.By studying the deposition rule of particulate matter on the surface of finned tube heat exchanger, it can provide a reliable theoretical basis for reducing the deposition of particulate matter. At the same time, it is of practical significance for the structural transformation of finned tube heat exchanger and the cleaning of finned tube heat exchanger.In this paper, the deposition of particulate matter on the surface of finned tube heat exchanger was studied by means of simulation and experiment.Combined with the actual situation, some suggestions are put forward to reduce the deposition of particulate matter on the surface of finned tube heat exchanger.The deposition characteristics of particles with different particle sizes on the surface of flat finned tube heat exchangers were studied by means of simulation. The motion trajectories of particles with different particle sizes between fins and the deposition rates on the surface of finned tube heat exchangers were analyzed.The results show that in the range of low wind speed 1~3m/s, the trajectory of particles with particle size between 1 渭 m and 10 渭 m shows a smooth curve, the turbulence pulsation of the air flow has a great influence on the particles, and the inertial force plays a major role with the increase of wind speed for particles with particle size larger than 50 渭 m.The trajectory is linear and the deposition rate increases.Different wind speed and fin spacing have great influence on the deposition of particulate matter.In the range of 1~6m/s wind speed, the deposition rate of particles with 10 渭 m decreases by 50 渭 m with the increase of wind speed. In the range of 1~3m/s wind speed, the deposition rate decreases with the increase of wind speed, and in the range of 4~6m/s wind speed, the deposition rate increases with the increase of wind speed.The results show that the larger the fin spacing, the greater the deposition rate of particles with diameter larger than 20 渭 m, and the smaller the deposition rate of particles with diameter less than 10 渭 m.This paper proves the feasibility and accuracy of the simulation.Some suggestions on controlling the deposition of particulate matter on the surface of finned tube heat exchanger are put forward.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU831.4

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