弯曲压缩坡道流动的双稳态性
The bistability of curved compression ramp flows
AI总结：
本文通过思想实验与三维直接数值模拟，揭示了弯曲压缩坡道流动在相同边界条件下存在分离与附着两种稳定状态的双稳态性，并指出其对超声速/高超声速飞行器全局气动热力学特性的重要影响。
摘要：
本文研究了弯曲压缩坡道（CCR）流动的双稳态性。报告指出，即使在相同的边界条件下，分离和附着状态也能稳定建立，这表明CCR流动的最终稳定状态还取决于初始条件和演化历史。首先，我们设计了一个涉及CCR流动两种建立路径的思想实验，分别构建了两种截然不同的稳定状态。随后，通过三维直接数值模拟（DNS）精心实现了该思想实验，验证了双稳态的存在。最后，我们对比了两种稳定状态下的压力、壁面摩擦和热流分布。作为激波-边界层相互作用的典型类型，局部CCR流动常出现在飞行器上，因此双稳态必然对全局气动热力学特性带来显著变化，这是超声速/高超声速飞行必须应对的问题。
英文摘要：
This paper investigates the bistability of curved compression ramp (CCR) flows. It reports that both separated and attached states can be stably established even for the same boundary conditions, revealing that the ultimate stable states of CCR flows also depend on the initial conditions and evolutionary history. Firstly, we design a thought experiment involving two establishment routes of CCR flows, constructing two distinct-different stable states, respectively. Subsequently, three-dimensional direct numerical simulations are meticulously performed to instantiate the thought experiment, verifying the existence of the bistable states. Finally, we compare the pressure, wall friction, and heat flux distributions under two stable states. As a canonical type of Shock wave-Boundary layer interactions, local CCR flows often appear on aircraft, hence the bistability will certainly bring noteworthy changes to the global aerothermodynamic characteristics, which supersonic/hypersonic flight has to deal with.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
