颗粒两相激波/湍流边界层干扰的力热双向耦合机理研究
TWO-WAY MOMENTUM AND THERMAL COUPLING MECHANISMS IN PARTICLE-LADEN SHOCK WAVE/TURBULENT BOUNDARY LAYER INTERACTION
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摘要: 本文采用直接数值模拟方法, 开展激波/颗粒两相湍流边界层干扰研究, 考虑颗粒与流体的双向力热耦合, 阐明了不同温度的热非平衡颗粒对流动速度温度相关统计量以及温度脉动平衡输运关系的影响规律. 研究发现, 有限热惯性冷颗粒使流体温度降低, 热边界层变薄, 从流场中吸热. 热颗粒导致流体温度升高, 热边界层变厚, 在流场中放热, 热惯性越大, 颗粒放热最明显. 有限热惯性冷颗粒不仅降低了流体的平均温度, 还削弱了流体在整个边界层内的温度脉动. 颗粒放热主要调制能量输运的强度而非改变其空间分布. 颗粒的热惯性不仅会影响壁面热流的大小, 还会改变壁面热流的主要来源.Abstract: Direct numerical simulations (DNS) are conducted for particle-laden oblique shock wave/turbulent boundary layer interactions incorporating two-way momentum and heat coupling, to analyze the impacts of thermally non-equilibrium particles on fluid velocity, temperature turbulence statistics and the temperature fluctuation transport. Results indicate that finite thermal inertia cold particles absorb heat from the flow, decreasing mean fluid temperature and suppressing full temperature fluctuations in boundary layer. Hot particles release heat to elevate fluid temperature and broaden the thermal boundary layer, and heat release strengthens with growing particle thermal inertia. Particle heat feedback adjusts only the intensity of turbulent energy transport without changing its spatial pattern. Additionally, particle thermal inertia modulates both the magnitude and dominant contributing terms of wall heat flux.
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