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Title: Effects of Heat Transfer on Laminar-to-Turbulent Transition over a Compressor Blade Operating at Low Reynolds Number
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Authors: LU Lehan, WANG Mingyang, ZHANG Yanfeng, SUN Shuang, HUANG Zhen, WANG Maomao
作者：卢乐晗，王名扬，张燕峰，孙爽，黄禛，王茂茂
单位：中国民航大学航空工程学院，中国科学院工程热物理研究所，中国航天科技集团公司空气动力学国家重点实验室
Journal of Thermal Science, 2024, 33(5): 1826-1838.
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摘要
Abstract:To control the transition process in a laminar separation bubble (LSB) over an ultra-high load compressor blade at a Re of 1.5×105, the effects of wall heat transfer were considered and numerically investigated by large eddy simulations (LES). Compared with the adiabatic wall condition, the local kinematic viscosity of airflow was reduced by wall cooling; thus the effects of turbulent dissipation on the growth of fluctuations were weakened. As such, the transition occurred much earlier, and the size of LSB became smaller. On the cooled surface, the spanwise vortices deformed much more rapidly and the size of hairpin vortex structures was decreased. Furthermore, the rolling-up of 3D hairpin vortices and the ejection and sweeping process very close to the blade surface was weakened. Correspondingly, the aerodynamic losses of the compressor blade were reduced by 18.2% and 38.4% for the two cooled wall conditions. The results demonstrated the feasibility of wall cooling in controlling the transition within an LSB and reducing the aerodynamic loss of an ultra-highly loaded compressor blade.
摘要：为了控制超高负荷压气机叶片上的层流分离泡(LSB)内转捩过程，采用大涡模拟(LES)方法研究了叶片壁面传热对层流分离泡转捩的影响。与绝热壁面条件相比，壁面冷却降低了气流的局部运动粘度，从而减弱了湍流耗散对波动增长的影响。因此，这种转变发生得更早，LSB的规模变得更小。在冷却壁面，展向涡的变形速度大大加快，发夹涡结构的尺寸减小。此外，三维发夹涡的卷起和非常靠近叶片表面的引射和扫掠过程被削弱。相应地，两种冷却壁面条件下压气机叶片气动损失分别降低了18.2%和38.4%。结果表明，壁面冷却在控制LSB内部过渡和降低超高负荷压气机叶片气动损失方面是可行的。
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引用格式
LU Lehan, WANG Mingyang, ZHANG Yanfeng, SUN Shuang, HUANG Zhen, WANG Maomao, Effects of Heat Transfer on Laminar-to-Turbulent Transition over a Compressor Blade Operating at Low Reynolds Number, Journal of Thermal Science, 2024, 33(5): 1826-1838.
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