弯曲通道中振荡跨音速流动的非独特机制

Q3 Earth and Planetary Sciences
Alexander Kuzmin
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引用次数: 0

摘要

以雷诺平均纳维-斯托克斯方程为基础,对 9° 弯道中的湍流跨声速二维气流进行了数值研究。气流在通道入口处为超音速,在出口处为亚音速。数值解揭示了在某些边界条件范围内流动状态的非唯一性。随着流入马赫数 M∞ 或攻击角或出口 pexit 压力的变化,形成的冲击波的位置会出现滞后现象。滞后现象的存在是由于冲击波与通道凸壁上的膨胀流区域相互作用造成的。讨论了冲击波在马赫数 M∞ 或压力 pexit 强制振荡下的行为。研究了滞后和非独特机制对 M∞、pexit 振荡幅度和周期的依赖性。结果表明,长通道中的滞后基本上比短通道中的滞后宽。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Non-unique regimes of oscillatory transonic flow in bent channels

Non-unique regimes of oscillatory transonic flow in bent channels

The turbulent transonic two-dimensional airflow in 9°-bent channels is studied numerically on the basis of the Reynolds-averaged Navier–Stokes equations. The flow is supersonic at the entrance of channels and subsonic at the exit. Numerical solutions reveal non-uniqueness of flow regimes in certain ranges of boundary conditions. The location of a formed shock wave exhibits hysteresis with changes in the inflow Mach number M, or the angle of attack, or pressure given at the exit pexit. The existence of hysteresis is caused by an interaction of the shock wave with an expansion flow region over the convex wall of channel. Shock wave behavior under forced oscillations of the Mach number M or pressure pexit is discussed. Dependencies of hysteresis and non-unique regimes on the amplitude and period of the oscillations of M, pexit are studied. It is shown that hysteresis in a long channel is essentially wider than that in a short one.

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来源期刊
Aerospace Systems
Aerospace Systems Social Sciences-Social Sciences (miscellaneous)
CiteScore
1.80
自引率
0.00%
发文量
53
期刊介绍: Aerospace Systems provides an international, peer-reviewed forum which focuses on system-level research and development regarding aeronautics and astronautics. The journal emphasizes the unique role and increasing importance of informatics on aerospace. It fills a gap in current publishing coverage from outer space vehicles to atmospheric vehicles by highlighting interdisciplinary science, technology and engineering. Potential topics include, but are not limited to: Trans-space vehicle systems design and integration Air vehicle systems Space vehicle systems Near-space vehicle systems Aerospace robotics and unmanned system Communication, navigation and surveillance Aerodynamics and aircraft design Dynamics and control Aerospace propulsion Avionics system Opto-electronic system Air traffic management Earth observation Deep space exploration Bionic micro-aircraft/spacecraft Intelligent sensing and Information fusion
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