油氣分離器的優化與分析

Analysis of Oil Separation System

李卓昱(Cho-Yu Lee) ； 林振鋒(Chin Fong Lim)

《燃燒季刊》 104期 (2019/02) Pp. 5-13

https://doi.org/10.30041/CQ.201902_(104).0001

摘要

增壓引擎對於油氣分離效率的要求很高，增壓器上若沾上油滴將會增加排放汙染。本研究主要針對渦輪引擎的迷宮式分離器進行分析，當油氣在迷宮内流速降低，粒徑較大的油滴撞擊壁面後會發生分離的現象。接著各別針對油氣分離器兩側（Clean side and Dirty side）進行優化工作，其主要概念為在小範圍的修改下有效的改善油滴分離效率。從對策後的結果觀察到Clean／Dirty side壓力損失增加，主要為縮小彎角截面積所導致，判斷能有效的提升分離效率。依兩者內部流場分析結果判斷氣流於迷宮内部流動順暢性，使得分離效率提高。兩者分析結果皆改善了滯留區域流速，提升彎角流速有助於分離較小油滴粒徑，因此分離效率較佳。Clean side對策迷宮的分離效率整體提升3.68至17.05%，分離效率落於85.92至100%；Dirty side對策迷宮的分離效率整體提升2.67至8.51%，分離效率落於88.67至100%。

關鍵字

油氣分離器 ； 油滴分離效率

並列摘要

If oil droplet attaches on the compressor wheel, it will increase the turbocharged engine's pollution emissions. Thus a higher efficiency oil separation system is acquired for the turbocharged engine. In this study, the oil mist separator was analyzed. The system is to collect oil droplets while they are colliding with the wall at low speed. Then the optimized work was carried out on both sides of the oil-gas separator (Clean side and Dirty side). The main concept is to effectively improve the oil droplet separation efficiency with small modifications. The optimized oil separator has been analyzed for the pressure loss of both sides. Reducing the cross-sectional area of the corner was able to enhance separation efficiency. According to the internal flow field analysis results, the smoothness of the airflow inside the labyrinth improves the separation efficiency effectively. Analytical results of both sides show that the flow rate in the retention zone was improved. The higher angular velocity the better separation efficiency is. The separation efficiency of the clean side improves 3.68 to 17.05%, which is in the range of 85.92 to 100%. The separation efficiency of the Dirty side improves 2.67 to 8.51%, which is in the range of 88.67 to 100%.

並列關鍵字

Oil Separation system ； Oil and droplet separation efficiency