关键词: 自由射流, 结冰试验, 流场特性, 多目标优化设计, 流场均匀度

Abstract: In order to meet the airworthiness certification requirements for high-altitude ice crystal icing tests of aero-engines, this paper proposes a free jet-based high-altitude ice crystal icing test chamber and conducts research on its flow field characteristics and structural optimization. Using computational fluid dynamics (CFD), the development of the jet flow in the test chamber was simulated, with a focus on analyzing the effects of the jet core length and the distance between the nozzle and the engine on the flow field uniformity. Additionally, aerodynamic performance and structural constraints were incorporated into a multidisciplinary optimization framework to optimize key parameters such as nozzle size and chamber layout. The results show that the optimized test chamber meets the environmental requirements for the engine and significantly improves the velocity and pressure uniformity at the engine inlet. This paper innovatively applies multidisciplinary design optimization methods to the design of the free jet ice crystal icing test chamber, providing a reference for enhancing the ground icing test capability of aero-engines.

Key words: free jet, icing test, flow field characteristics, multi-target design optimization, flow field uniformity