本文選題：翅片管式換熱器　切入點：顆粒物　出處：《西安建筑科技大學》2013年碩士論文

【摘要】：翅片管式換熱器是空調(diào)系統(tǒng)的重要設備之一。顆粒物在翅片管式換熱器表面的沉積，不僅影響翅片管換熱器的換熱效率，而且會間接影響室內(nèi)空氣品質(zhì)。通過研究顆粒物在翅片管換熱器表面的沉積規(guī)律，可以為減少顆粒物沉積提供可靠的理論依據(jù)，同時對翅片管換熱器的結構改造，以及清洗工作具有現(xiàn)實意義。本文利用模擬和實驗方法，對顆粒物在翅片管換熱器表面的沉積規(guī)律進行研究。并且結合實際情況，，對降低翅片管換熱器表面顆粒物沉積提出相關建議。 采用模擬方法對不同粒徑的顆粒物在平直型翅片管換熱器表面的沉積特性進行研究，分析不同粒徑顆粒物在翅片間的運動軌跡，以及在翅片管換熱器表面的沉積率。結果顯示，在低風速1~3m/s范圍內(nèi)，粒徑在1~10μm之間的顆粒物軌跡呈現(xiàn)光滑曲線型，氣流的湍流脈動對顆粒物影響很大；粒徑大于50μm的顆粒物，隨著風速增加，慣性力起到主要作用，軌跡呈現(xiàn)直線型，沉積率也增加。 不同風速和翅片間距對顆粒物的沉積影響也較大。在1~6m/s風速范圍內(nèi)，10μm的顆粒物隨著風速增加，顆粒物沉積率減�。�50μm顆粒物，在1~3m/s風速范圍內(nèi)，隨著風速增加沉積率減小，在4~6m/s風速范圍內(nèi)，隨著風速增加沉積率增加。并且通過模擬得出，翅片間距越大，粒徑大于20μm的顆粒物沉積率越大，粒徑小于10μm的顆粒物沉積率越小。 本文通過實驗對模擬得出的顆粒物沉積規(guī)律進行了驗證，證明了模擬的可行性和準確性。并對控制顆粒物在翅片管式換熱器表面沉積提出相關建議。
[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.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU831.4

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