代數螺旋線型渦卷式壓縮機之三維熱流場數值模擬分析

Numerical Analysis on The Three Dimensional Thermal-Flow Field of Scroll Compressor with Algebraic Spiral

王偉勳(Wey-Xuin Wang)

指導教授 ： 黃博全

國立臺北科技大學/機電學院/能源與冷凍空調工程系碩士班/碩士(2012年)

摘要

隨著變頻直流無刷馬達於渦卷式壓縮機的廣泛應用，具有高能源效率之渦卷式壓縮機在空調、冷凍設備的使用率也大幅增加。但目前渦卷式壓縮機的發展因排氣量限制，在應用上仍僅於中小噸數場合使用，因此本文於現有商用渦卷式壓縮機之運轉機構下，將其渦卷線型改為能增加排氣量及內容積比的代數螺旋線渦卷來做為性能增進研究，本文透過數值模擬的方式來分析並比較商用渦卷式壓縮機使用圓形漸開線渦卷及代數螺旋線渦卷在不同壁面熱傳條件以及不同入口溫度下的性能，而後於商用壓縮機標準測試條件下進行各線型渦卷之壓縮機內流場氣流分析，探討其流場對壓縮機運作之影響。
模擬結果發現：(1)不論在何種運作條件，代數螺旋線渦卷之壓縮室內部壓力特性曲線斜率變化區段皆較圓形漸開線渦卷多; (2)在同一高度及渦卷圈數下，隨著k值縮小代數螺旋線渦卷之排氣量愈大; (3)在k=0.8時排氣量較圓形漸開線渦卷增大了8.56%，且在入口溫度較低的高壓縮比運作條件下，k=0.8之代數螺旋線渦卷除了耗功減少了5.78%外，其質量流率更是增加16.67%; (4)從流場分析觀察到渦卷順時針向移動時，左側壓縮室之物理量均較右側略大，入口氣流在第一壓縮室逐漸閉合時，壓縮室與周圍氣流將形成迴流區域; (5)動渦卷體對排氣口的遮蔽面積大小將影響兩側壓縮室物理量分佈均勻性。

關鍵字

代數螺旋線 ； 渦卷式壓縮機三維數值模擬 ； 非等壁厚渦卷、渦卷洩漏氣流分析

並列摘要

With more applications of variable frequency inverter and the high volume efficiency, scroll compressor are widely used in air conditioning and refrigeration. In this research, we modified the scroll type with algebraic spirals in the scope of the same operation mechanism of commercial scroll compressor for the increase of displacement volume and built in volume ratio.
In this study, the commercial CFD code is used to perform simulation, the different operating conditions of compressor were analyzed with the conventional involute scroll and with the algebraic spiral scrolls, various scroll wall heat transfer, diverse inlet temperature and the standard compressor test situation were included. Moreover, in this study, we also explore the thermal flow field of compressor chambers with various scroll type in the standard compressor test situation by simulations.
The results are as follows: (1)The less the exponential value k, the larger the displacement volume of compressor with algebraic scroll had, and for all cases the discharge position delayed 90 degree angle than involue scroll; (2)whatever the operating condition, the slope of curve segment of pressure performance curve in the algebraic spiral scroll shows multiple changes than that for the involute scroll; (3)the displacement volume of compressor with the algebraic spiral scroll at k=0.8 was increased by 8.56% and the pressure work was reduced by 5.78%, the mass flow rate increase by 16.67% than that of involute spiral scroll; (4)on the visualization of flow field, physical properties on the left side of compressor chambers are larger than the right side one as orbiting scroll moved clockwise, and inlet flow conformed recirculation zone with the surrounding flow when the first chamber came closely; (5)the shading area of orbiting scroll to discharging port resulted in asymmetric distribution of physical property between both side of chambers in compressor.

並列關鍵字

algebraic spiral ； 3-D scroll compressor simulation ； leakage flow analysis

參考文獻

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