在冲击道中对超音速边界层过渡的鼻尖度影响的实验研究
Jinhwi Kim1, Junhyuk Nam1, Jungmu Hur1
1Department of Aerospace Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
Scientific reports
|November 3, 2025
概括
在高超音速圆上,鼻尖越来越,延迟了边界层的过渡. 这项研究使用先进的诊断来揭示直言不讳如何影响不稳定模式,这对于设计高速车辆至关重要.
科学领域:
- 流体动力学 流体动力学
- 航空航天工程 航空航天工程
- 超音速技术是一种高超音速技术.
背景情况:
- 边界层的过渡对于空气动力学性能和热负荷至关重要.
- 鼻尖的几何形状在高超音速系统中显著影响流动稳定性.
研究的目的:
- 实验性地研究鼻尖粗对边界层过渡的影响.
- 分析不同鼻尖半径对马赫6.76.6的流动不稳定性的影响.
主要方法:
- 在超音速冲击道中进行的实验.
- 利用高速的schlieren可视化,表面热量流和压力测量.
- 应用光谱正确直角分解和光谱分析.
主要成果:
- 增加了鼻尖的凸,延迟了边界层过渡的开始.
- 观察到的第二模式不稳定性转移到更低的频率,具有更大的直率.
- 鉴定了一种新型的低频不稳定性 (200 kHz) 对于非常粗的圆.
结论:
- 鼻尖是控制高超音速边界层稳定性的关键因素.
- 在超音速车辆设计中必须考虑多种不稳定模式.
- 这些发现有助于设计更稳定,更高效的高超音速飞行器.
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