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首页> 外文期刊>Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow >Investigation of turbulence modification in a non-reactive two-phase flow
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Investigation of turbulence modification in a non-reactive two-phase flow

机译：非反应性两相流中湍流变化的研究

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In a two-phase flow the influence of a dispersed phase on the turbulence properties of a continuous phase, known as turbulence modification, is investigated. An experimental approach is discussed that is suitable for studying the decay of grid-generated turbulence in a vertically orientated wind tunnel with a cross-section large enough to avoid influences from walls. Phase Doppler anemometry is used to characterize both single and two-phase flow by measuring mean axial and radial velocity components, velocity fluctuations, turbulent kinetic energy, and integral time scales. By direct comparison of results from single- and two-phase flows, the feedback of the dispersed phase on the continuous phase can be isolated. The data is used to deduce a source term for particle-induced turbulence production appropriate for a numerical simulation of the flow, based on the Reynolds-averaged Navier-Stokes equations. Although of special importance for a detailed understanding of turbulent two-phase combustion, additional complexity introduced by evaporation and chemical reactions is avoided by using glass beads as dispersed phase. [References: 46]
机译：在两相流中，研究了分散相对连续相湍流特性的影响，称为湍流修正。讨论了一种实验方法，该方法适用于研究横截面足够大以避免墙体影响的垂直定向风洞中网格产生的湍流的衰减。通过测量平均轴向和径向速度分量，速度波动，湍动能和积分时标，使用相位多普勒风速仪来表征单相和两相流。通过直接比较单相和两相流的结果，可以隔离分散相在连续相上的反馈。数据用于根据雷诺平均Navier-Stokes方程推导适用于流动数值模拟的，由粒子引起的湍流产生的源项。尽管对于详细了解湍流两相燃烧具有特别重要的意义，但是通过使用玻璃珠作为分散相可以避免由于蒸发和化学反应而导致的额外复杂性。 [参考：46]

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