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Numerical investigation of a swirl diffuser with a novel design using large eddy simulations

机译：具有大涡模拟的新颖设计旋流扩散器的数值研究

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摘要

In the present study, a swirl diffuser with a novel design is proposed, in which three geometrical parameters, the angle of the guide vanes cp, the height of the convergent chamber h, and the radius of the diffuser outlet r, can be varied independently. Large eddy simulations were conducted to examine the airflow characteristics downstream of the swirl diffuser. Grid independence was obtained for the grid number 4000,000, and this result was validated by comparison with an experiment. The vorticities, the instantaneous and averaged velocities, and the evolution of the age of air were investigated. The turbulent kinetic energy budget and the momentum balance in the time-averaged Navier-Stokes equations were then studied in an attempt to clarify the mechanism of the swirl diffuser's high diffusing performance. With the increasing swirling strength, the pressure gradient force could not balance the centrifugal force in the radial direction. As a result, the vortex core expanded, generating turbulence. A non-dimensional swirl number parameter was suggested which can be used for determining the structure of the swirl diffuser airflow. To validate this non-dimensional parameter, different combinations of cp, h, and r were examined. It was found that only if the swirl number is the same, will the airflow structure be similar. The results of our study are likely to be useful for obtaining deeper insights about the swirl diffuser airflow, and for better understanding of the effect of the controlling parameter on the swirl diffuser's performance.
机译：在本研究中，提出了一种新颖设计的旋流扩压器，其中三个几何参数，导叶的角度cp，会聚室的高度h和扩压器出口的半径r可以独立变化。 。进行了大涡模拟，以检查旋流扩散器下游的气流特性。获得了网格数为4000,000的网格独立性，并通过与实验的比较验证了此结果。研究了涡度，瞬时速度和平均速度以及空气年龄的演变。然后研究时间平均Navier-Stokes方程中的湍动能预算和动量平衡，以阐明旋流扩散器高扩散性能的机理。随着回旋强度的增加，压力梯度力无法平衡径向上的离心力。结果，涡旋核膨胀，产生湍流。建议使用无量纲的旋流数参数，该参数可用于确定旋流扩散器气流的结构。为了验证此无量纲参数，检查了cp，h和r的不同组合。已经发现，只有旋流数相同，气流结构才会相似。我们的研究结果可能有助于获得对旋流扩散器气流的更深入的了解，并有助于更好地了解控制参数对旋流扩散器性能的影响。

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