热能动力工程

作者：胡朝棕,郝子晗,杨星,丰镇平

单位：西安交通大学能动学院叶轮机械研究所；陕西省叶轮机械及动力装备工程实验室,,西安交通大学能动学院叶轮机械研究所；陕西省叶轮机械及动力装备工程实验室,,西安交通大学能动学院叶轮机械研究所；陕西省叶轮机械及动力装备工程实验室,,西安交通大学能动学院叶轮机械研究所；陕西省叶轮机械及动力装备工程实验室,

关键词：燃气涡轮;热斑;温比;用户自定义函数;颗粒物沉积

基金：国家自然科学基金（52276035）；航空发动机及燃气轮机基础科学中心项目（P2022-B-II-028-001）

Deposition of particulate pollutants on turbine vanes after being ingested into aircraft engines can lead to degradation of their thermomechanical performance under high temperature and high-velocity gas flow conditions. The high-pressure turbine guide vanes adjacent to the exit of the combustion chamber, experience the highest temperatures among all turbine components, making them more susceptible to severe deposition issues. The deposition problems on the vane surfaces become even more complex due to the influence of hot streaks originating from the combustion chamber. In this study, numerical simulations combined with user-defined functions were employed to investigate the migration and deposition characteristics of particles on the first-stage stator vane of a high-pressure turbine under actual operating conditions. A Gaussian temperature distribution was applied at the turbine inlet to simulate hot streaks, and variations in the hot streaks temperature ratio and their relative circumferential positions to the vane were considered. Results revealed significant temperature variations between adjacent vanes due to the presence of hot streaks. When the hot streaks were positioned directly in front of the vane leading edge, a large number of high-temperature particles impinged and deposited on the leading edge surfaces. As the hot streaks was aligned with the vane mid-passage, more high-temperature particles deposited on the mid-chord and trailing edge regions of the vane, as well as the leading edge of adjacent vanes. Increasing the hot streaks temperature ratio caused the high-temperature center of the hot streaks trail to concentrate towards the midspan position, reducing overall deposition levels on the vane surface. In contrast to a uniform inlet temperature case, the hot spot increased the deposition levels on two adjacent vanes and widened the gap of deposition efficiency between the vanes by up to 11.6%, thus intensifying the flow field non-uniformities towards downstream rotors.

来源：2024年第11期

《热能动力工程》期刊编辑部

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