迴轉式壓縮機熱流模擬分析;Numerical Analysis of Thermal Flow for Rotary Compressors

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题名:	迴轉式壓縮機熱流模擬分析;Numerical Analysis of Thermal Flow for Rotary Compressors
作者:	方鎮豪;Fang,Jhen-Hao
贡献者:	機械工程學系
关键词:	迴轉式壓縮機;過濾瓶;動網格;計算流體力學
日期:	2016-01-27
上传时间:	2016-03-18 09:42:41 (UTC+8)
出版者:	國立中央大學
摘要:	本文利用FLUENT軟體進行迴轉式壓縮機熱流模擬，分析模型包含過濾瓶及壓縮腔兩個部分。過濾瓶模擬的目的為了解冷媒經過過濾瓶內部的流動後，流入壓縮腔的流動特性，以便設定壓縮腔入口邊界條件；在壓縮腔的模擬中，使用動網格模擬轉子運動，分析壓縮腔出口的週期流動特性。本文應用k-?紊流模型以穩態模擬過濾瓶，並以實驗壓力為邊界條件，模擬結果顯示過濾瓶壓力差主要在流場尺寸出現變化的位置（入口管與瓶身連接處、內管入口處），過濾瓶出口溫度可視為均勻溫度場，而出口速度在彎管處外側較高，內側較低。以非穩態計算搭配動網格模擬壓縮腔，得到壓縮腔的壓力、速度與溫度的週期性變化，在開口開啟前，壓縮區內壓力隨著轉子轉動造成壓縮作用而使冷媒增壓增溫，當壓縮區內在0.6個週期時壓力達到開啟開口的壓力條件，開口開啟而腔內壓力會維持直到轉子轉過滑片，壓縮區與進氣區連通，使開口關閉。比較邊界條件為定壁溫與絕熱的差異，定壁溫造成冷媒的升溫比壁面絕熱多了10%的升溫。; This thesis presents the numerical simulation of the rotary compressor including the accumulator and the compression chamber by using the software FLUENT. The analysis the periodic flow characteristics of the outlet in compression chamber is executed by simulation of dynamic meshes of rotor motion. The k-? turbulent model is applied for the calculation of the accumulator. The results predict that the pressure varies at the different flow region (the connection between inflow tube and accumulator, the connection between the accumulator, and the outflow tube). The temperature at the outlet of the accumulator is predicted as uniformly distributed, and the velocity is higher at the outer than at the inside of the bend on the outflow tube. The refrigerant’s pressure in the compression zone increases with rotor motion before the outlet valve opened. At about 0.6 period, the pressure reaches the condition of valve-opening. The outlet valve opens and the pressure maintains a constant value until rotor sweep across the vane so that the compression zone and intake zone are connected, and the outlet valve closed. Compare two thermal boundary conditions of the compression chamber (constant wall temperature and insulated wall), the refrigerant’s temperature is 10% higher than that of the insulated wall.
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