数值模拟在航空发动机传动齿轮流体动力损失分类中的适用性

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Accounts of Chemical Research Pub Date : 2023-10-11 DOI:10.1115/1.4063713
Hidenori Arisawa, Mitsuaki TANAKA, Hironori HASHIMOTO, Tatsuhiko Goi, Takahiko Banno, Hideyuki Imai
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引用次数: 0

摘要

摘要在航空发动机高速齿轮系统中,降低占动力损失大部分的流体动力损失,可以显著提高燃油经济性。然而,关于高速气液两相流涉及齿轮啮合和齿轮护套(有效降低损失的齿轮外壳)的实际数值例子很少。因此,本研究采用包括齿轮啮合在内的物体边界的孔隙度法、流体体积法和气液界面的表面压缩法作为快速且数值稳定的计算方法。此外,在齿轮齿面接触面处设置间隙以提高计算稳定性,并考虑两相流与单相流流动阻力的差异(由于油颗粒的分离)来设置油的性质,以提高计算精度。为了验证数值模拟方法的有效性,采用最大外缘转速为100 m/s、规格相当于航空发动机齿轮的两轴螺旋齿轮箱,对空气流量、油流量和流体动力损失进行了验证。在确定了实际精度后,利用数值模拟来了解气、油流动、扭矩和叶冠效应之间的关系。因此,流体动力损失可以从现象学上进行分类。
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Applicability of Numerical Simulation to the Classification of Fluid Dynamic Loss in Aeroengine Transmission Gears
Abstract In high-speed gear systems for aeroengines, reducing the fluid dynamic loss, which accounts for the majority of power loss, can significantly improve fuel economy. However, few practical numerical examples are available regarding high-speed gas-liquid two-phase flows involving gear meshing and gear shrouds (gear enclosures, which are effective for loss reduction). Therefore, in this study, the porosity method for object boundaries including the gear meshing, the volume of fluid method, and the surface compression method for the gas-liquid interface were used as fast and numerically stable calculation methods. In addition, a gap was provided at the contact surface of the gear tooth surface to improve the calculation stability, and the oil properties were set considering the difference between the flow resistance in a two-phase flow and that in a single-phase flow (due to the separation of oil particles) to improve the calculation accuracy. To validate the numerical simulation method, a two-axis helical gearbox with a maximum peripheral speed of 100 m/s with specifications equivalent to aeroengine gears was used, and the air flow, oil flow, and fluid dynamic losses were validated. Once the practical accuracy was confirmed, the numerical simulation was used to understand the relationship among air and oil flows, torque, and the effect of the shroud. Consequently, the fluid dynamic loss could be classified phenomenologically.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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