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首页> 外文期刊>Thermal engineering >Research of Influence of the Installation of Perforated Plates on the Flow in the Diffuser Ducts with Turning of the Flow at 90°
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Research of Influence of the Installation of Perforated Plates on the Flow in the Diffuser Ducts with Turning of the Flow at 90°

机译：旋转90度时穿孔板的安装对扩压器管道中流动的影响的研究

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Diffuser channels with 90° rotation of the flow are used in a number of technical devices to slow down and turn the flow of the working fluid. Besides slowing down and turning of the flow at the outlet of the channels, it is necessary, as a rule, to possibly provide a uniform field of velocities. However, it is necessary to take into account the requirements for the compactness, which, in some cases, are crucial and lead to the need for nonoptimal channels in terms of aerodynamics, including wide-angle diffusers, which are highly likely to cause the flow breakaway with sharply uneven output velocity field. The results of experimental research method of alignment of the velocity field at the output of the wide-angle flat diffuser channel with 90° rotation of the flow by installing plates with round and square holes and varying degrees of perforation inside of the channel are presented in this paper. The studies were carried out on an open-type wind tunnel changing the dimensionless velocity at the inlet of the diffuser channel section in the range from 0.18 to 0.72. The values of the coefficients of the total energy loss in a channel were determined. Which of the installed perforated plates lead to the lowest increase of the energy loss was established. The optimal location of these plates within the duct was determined. The measurements of the velocity fields at the outlet of the channel were carried out. Simultaneously, the measurements of the pressure pulsations on the side wall at the outlet of the channel were carried out. It was shown that the minimal increase in energy losses due to the installation of plates can substantially equalize the output of the velocity field and reduce the dynamic loads on the walls. The obtained results allow us to recommend this method of aligning the output of the velocity field for real technical devices that require the simultaneous slowdown in the flow and its rotation.
机译：流量旋转90°的扩散器通道用于许多技术设备中，以减慢和转向工作流体的流量。通常，除了使通道出口处的流量减慢和转向外，通常还必须提供均匀的速度场。但是，必须考虑对紧凑性的要求，在某些情况下，紧凑性是至关重要的，并导致在空气动力学方面需要非最佳通道，包括广角扩散器，这很可能导致气流分离，输出速度场明显不均匀。通过安装带有圆孔和方孔以及孔道内不同程度的穿孔的板片，提出了在流向90°的旋转情况下使广角扁平扩散器通道的出口处的速度场对准的实验研究方法的结果。这篇报告。研究是在开放式风洞中进行的，该风洞将扩压器通道部分入口处的无量纲速度更改为0.18至0.72。确定通道中总能量损失的系数值。建立了哪个安装的穿孔板导致能量损失的增加最小。确定了这些板在管道内的最佳位置。在通道出口处进行速度场的测量。同时，对通道出口处的侧壁上的压力脉动进行了测量。结果表明，由于安装板而造成的能量损失的最小增加可以使速度场的输出基本相等，并减少了壁上的动态载荷。所获得的结果使我们可以推荐这种方法来对齐速度场的输出，以用于需要同时降低流量及其旋转速度的实际技术设备。

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