Hysteresis of oscillatory airflow in a supersonic intake model

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

Abstract

Supersonic airflow deceleration in a conventional mixed-compression intake is studied numerically. The simulation of turbulent two-dimensional flow is based on the Reynolds-averaged Navier–Stokes equations and the k-ω SST turbulence model. Numerical solutions are obtained with ANSYS-18.2 CFX finite-volume solver of second-order accuracy. The solutions reveal flow hysteresis with step-by-step changes in the free-stream Mach number M. The hysteresis is caused by the instability of an interaction of a shock wave with the local region of flow acceleration formed near the throat of intake. Oscillations of the Mach number M in time are considered as well, and the existence of hysteresis is confirmed at small values of the amplitude A and period τ of the oscillations. The hysteresis shrinks with increasing amplitude A and eventually disappears at sufficiently large amplitudes. The dependence of shock wave oscillations on the period τ is also studied and transitions between different flow regimes are discussed.

超音速进气模型中振荡气流的滞后现象
对传统混合压缩进气口中的超音速气流减速进行了数值研究。二维湍流模拟基于雷诺平均纳维-斯托克斯方程和 k-ω SST 湍流模型。数值求解采用二阶精度的 ANSYS-18.2 CFX 有限体积求解器。求解结果表明,随着自由流马赫数 M∞ 的逐步变化,会出现流动滞后现象。滞后是由于冲击波与进气口喉部附近形成的局部流动加速区域相互作用的不稳定性造成的。马赫数 M∞ 在时间上的振荡也被考虑在内,在振荡的振幅 A 和周期 τ 值较小时,滞后的存在被证实。滞后随着振幅 A 的增大而减小,最终在振幅足够大时消失。此外,还研究了冲击波振荡对周期 τ 的依赖性,并讨论了不同流动状态之间的过渡。
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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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