Stability enhancement using a new combined casing treatment strategy in an ultra-highly loaded transonic compressor rotor

IF 5 1区 工程技术 Q1 ENGINEERING, AEROSPACE
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Abstract

Low-reaction compressors are promising for achieving high loads but face severe flow instability challenges. This study investigates a low-reaction transonic compressor rotor using casing treatment technologies to control unstable flow dynamics precisely. First, a design integrating self-recirculating and circumferential groove casing treatments near the leading edge is implemented. This design enhances flow capacity at the tip passage inlet. However, it causes a “stall transposition” phenomenon. The unstable flow structures shift from shock-tip leakage vortex interactions at the front to corner separation at the rear. Consequently, the stall mechanism transitions from an end-wall stall to a blade stall. To address this issue, a new casing treatment layout is proposed. Grooves are added after the mid-chord of the initial front casing configuration. This adaptation suppresses emerging unstable flow structures and extends the stall margin by approximately 12.07 %. Detailed flow field analysis shows that the rear grooves effectively reduced the trailing edge separation vortex. They also limit downstream corner separation and mitigate disturbances from tip leakage flows in the rear of the passage.

在超高负荷跨音速压缩机转子中采用新型组合套管处理策略增强稳定性
低反作用压缩机有望实现高负荷,但面临着严重的流动不稳定性挑战。本研究采用套管处理技术对低反作用跨音速压缩机转子进行了研究,以精确控制不稳定的流动动力学。首先,在前缘附近采用了自循环和圆周沟槽套管处理一体化设计。这种设计提高了叶尖通道入口的流动能力。然而,它会导致 "失速换位 "现象。不稳定的流动结构从前部的冲击尖端泄漏涡流相互作用转变为后部的角分离。因此,失速机制从端壁失速转变为叶片失速。为解决这一问题,提出了一种新的套管处理布局。在初始前机壳配置的中弦之后增加了凹槽。这种调整抑制了新出现的不稳定流动结构,并将失速裕度扩大了约 12.07%。详细的流场分析表明,后凹槽有效地减少了后缘分离涡。它们还限制了下游角分离,并减轻了通道后部尖端泄漏流的干扰。
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来源期刊
Aerospace Science and Technology
Aerospace Science and Technology 工程技术-工程:宇航
CiteScore
10.30
自引率
28.60%
发文量
654
审稿时长
54 days
期刊介绍: Aerospace Science and Technology publishes articles of outstanding scientific quality. Each article is reviewed by two referees. The journal welcomes papers from a wide range of countries. This journal publishes original papers, review articles and short communications related to all fields of aerospace research, fundamental and applied, potential applications of which are clearly related to: • The design and the manufacture of aircraft, helicopters, missiles, launchers and satellites • The control of their environment • The study of various systems they are involved in, as supports or as targets. Authors are invited to submit papers on new advances in the following topics to aerospace applications: • Fluid dynamics • Energetics and propulsion • Materials and structures • Flight mechanics • Navigation, guidance and control • Acoustics • Optics • Electromagnetism and radar • Signal and image processing • Information processing • Data fusion • Decision aid • Human behaviour • Robotics and intelligent systems • Complex system engineering. Etc.
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