Time-Dependent Effects of Glaze Ice on the Aerodynamic Characteristics of an Airfoil

IF 0.9 Q4 ENGINEERING, MECHANICAL

International Journal of Rotating Machinery Pub Date : 2018-03-07 DOI:10.1155/2018/2981739

N. Tabatabaei, M. Cervantes, C. Trivedi

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引用次数: 3

Abstract

The main objective of this study is to estimate the dynamic loads acting over a glaze-iced airfoil. This work studies the performance of unsteady Reynolds-averaged Navier-Stokes (URANS) simulations in predicting the oscillations over an iced airfoil. The structure and size of time-averaged vortices are compared to measurements. Furthermore, the accuracy of a two-equation eddy viscosity turbulence model, the shear stress transport (SST) model, is investigated in the case of the dynamic load analysis over a glaze-iced airfoil. The computational fluid dynamic analysis was conducted to investigate the effect of critical ice accretions on a 0.610 m chord NACA 0011 airfoil. Leading edge glaze ice accretion was simulated with flat plates (spoiler-ice) extending along the span of the blade. Aerodynamic performance coefficients and pressure profiles were calculated and validated for the Reynolds number of 1.83 × 106. Furthermore, turbulent separation bubbles were studied. The numerical results confirm both time-dependent phenomena observed in previous similar measurements: (1) low-frequency mode, with a Strouhal number –0.02, and (2) higher frequency mode with a Strouhal number –0.69. The higher frequency motion has the same characteristics as the shedding mode and the lower frequency motion has the flapping mode characteristics.

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釉冰对翼型气动特性的时变影响

本研究的主要目的是估计动态载荷作用在一个釉冰翼型。本文研究了非定常雷诺平均纳维-斯托克斯(URANS)模拟在预测结冰翼型振荡中的性能。将时间平均涡旋的结构和大小与测量结果进行了比较。此外，研究了两方程涡黏湍流模型——剪切应力输运(SST)模型在覆釉翼型动载荷分析中的准确性。以0.610 m弦长的NACA 0011型为研究对象，采用计算流体力学方法研究了临界结冰对翼型的影响。采用沿叶片延伸的平板(扰流冰)模拟前缘釉冰的积冰。计算并验证了雷诺数为1.83 × 106时的气动性能系数和压力分布。此外，还对湍流分离气泡进行了研究。数值结果证实了在以前的类似测量中观察到的两种时间依赖性现象:(1)低频模式，斯特劳哈尔数为-0.02;(2)高频模式，斯特劳哈尔数为-0.69。高频运动具有与脱落模态相同的特征，低频运动具有扑动模态特征。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Rotating Machinery ENGINEERING, MECHANICAL-

CiteScore

2.40

自引率

0.00%

发文量

审稿时长

25 weeks

期刊介绍： This comprehensive journal provides the latest information on rotating machines and machine elements. This technology has become essential to many industrial processes, including gas-, steam-, water-, or wind-driven turbines at power generation systems, and in food processing, automobile and airplane engines, heating, refrigeration, air conditioning, and chemical or petroleum refining. In spite of the importance of rotating machinery and the huge financial resources involved in the industry, only a few publications distribute research and development information on the prime movers. This journal is the first source to combine the technology, as it applies to all of these specialties, previously scattered throughout literature.