Quantitative computational fluid dynamic analyses of oil droplets deposition on vaneless diffusor walls of a centrifugal compressor,Energy Science & Engineering

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Quantitative computational fluid dynamic analyses of oil droplets deposition on vaneless diffusor walls of a centrifugal compressor
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2019-11-29 , DOI: 10.1002/ese3.561
Liwei Sun _{1,

2} , Chaochen Ma ₁ , Panpan Song ₁ , Hang Zhang ₁

Affiliation

In the vehicle turbocharger operating process, the diffusor walls are susceptible to oil droplet deposition. This deposition may cause deterioration in the diffusor flow performance, consequently resulting in the deterioration of compressor performance. In this paper, a three‐dimensional steady computational fluid dynamic (CFD) numerical investigation was performed to study droplet deposition on the walls of a centrifugal compressor diffusor. Firstly, the theoretical basis of oil droplet distribution and formation on the diffusor were presented. On the basis of these, the distribution rules of the capture efficiency and particle concentration for the diffusor were investigated considering six different droplet diameters (0.25 μm, 0.5 μm, 0.75 μm, 1.00 μm, 1.25 μm, 1.5 μm). The results indicate that the particle mass concentration on the hub side increased gradually, and the concentration on the shroud side decreased inversely. Furthermore, the area of high particle mass concentration focused on the small radius area of the hub side or at the downstream of the channel in the direction of the streamline. And the particle mass concentration on the shroud is equally distributed. Finally, the combination of turbulent diffusion and inertial theory was proposed to analyze the mentioned phenomenon, and the droplet deposition mechanisms on the centrifugal compressor diffusor were summarized.

中文翻译：

离心压缩机无叶片扩散壁上油滴沉积的定量计算流体动力学分析

在车辆涡轮增压器的运行过程中，扩散器壁易受油滴沉积的影响。这种沉积可能导致扩散器流动性能下降，因此导致压缩机性能下降。在本文中，进行了三维稳态计算流体动力学（CFD）数值研究，以研究液滴在离心式压缩机扩散器壁上的沉积。首先，介绍了扩散器上油滴的分布和形成的理论基础。在此基础上，研究了六种不同液滴直径（0.25μm，0.5μm，0.75μm，1.00μm，1.25μm，1.5μm）的扩散器捕获效率和颗粒浓度的分布规律。结果表明，轮毂侧的颗粒质量浓度逐渐增加，而护罩侧的颗粒质量浓度则相反地降低。此外，高颗粒质量浓度的区域集中在轮毂侧的小半径区域上或在流线方向上的通道的下游。并且罩上的颗粒质量浓度是均匀分布的。最后，结合湍流扩散和惯性理论对上述现象进行了分析，总结了离心压缩机扩散器上的液滴沉积机理。高颗粒质量浓度的区域集中在轮毂侧的小半径区域或流线方向上通道的下游。并且罩上的颗粒质量浓度是均匀分布的。最后，结合湍流扩散和惯性理论对上述现象进行了分析，总结了离心压缩机扩散器上的液滴沉积机理。高颗粒质量浓度的区域集中在轮毂侧的小半径区域或流线方向上通道的下游。并且罩上的颗粒质量浓度是均匀分布的。最后，结合湍流扩散和惯性理论对上述现象进行了分析，总结了离心压缩机扩散器上的液滴沉积机理。

更新日期：2019-11-29

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