| 基于双eN方法的短舱层流转捩影响因素 |
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| 引用本文： | 孟晓轩,白俊强,张美红,王美黎,何小龙,汪辉. 基于双eN方法的短舱层流转捩影响因素[J]. 航空学报, 2019, 40(11): 123040-123040. DOI: 10.7527/S1000-6893.2019.23040 |
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| 作者姓名： | 孟晓轩 白俊强 张美红 王美黎 何小龙 汪辉 |
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| 作者单位： | 西北工业大学航空学院,西安,710072;西北工业大学无人系统技术研究院,西安,710072;中国商用飞机有限责任公司上海飞机设计研究院,上海,201210 |
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| 基金项目： | 国家自然科学基金（11802245） |
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| 摘 要： | 发展自然层流短舱对提升现代民机的经济性和环保性具有重要意义,而对影响短舱层流转捩的因素进行研究有助于更好地开展短舱的层流设计。本文基于线性稳定性分析方法,将双eN方法同RANS方程求解器耦合,建立了一套可同时计算T-S（Tollmien-Schlichting）波和横流（CF）驻波诱导转捩的流动转捩预测方法,通过标准椭球算例验证了该方法的正确性,进而研究了来流马赫数、雷诺数、湍流度以及迎角对短舱转捩的影响。结果表明：马赫数和迎角会带来压力梯度的明显改变从而引起转捩位置发生变化;而在此构型的高雷诺数工况下,雷诺数和湍流度对转捩位置影响相对较小,转捩位置移动的区域不超过短舱长度的5%。因此在设计阶段,在高雷诺数条件下保持层流设计要尽量避免较大的逆压梯度,保持顺压梯度。
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| 关 键 词： | 自然层流短舱 双eN方法 线性稳定性分析 转捩判断 转捩影响因素 |
| 收稿时间： | 2019-04-01 |
| 修稿时间： | 2019-04-25 |
Laminar transition influencing factors of nacelle based on double eN method |
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| MENG Xiaoxuan,BAI Junqiang,ZHANG Meihong,WANG Meili,HE Xiaolong,WANG Hui. Laminar transition influencing factors of nacelle based on double eN method[J]. Acta Aeronautica et Astronautica Sinica, 2019, 40(11): 123040-123040. DOI: 10.7527/S1000-6893.2019.23040 |
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| Authors: | MENG Xiaoxuan BAI Junqiang ZHANG Meihong WANG Meili HE Xiaolong WANG Hui |
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| Affiliation: | 1. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;2. Unmanned System Research Institute, Northwestern Polytechnical University, Xi'an 710072, China;3. Shanghai Aircraft Design and Research Institute, Commercial Aircraft Corporation of China, Ltd., Shanghai 201210, China |
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| Abstract: | The development of natural laminar flow nacelle is of great significance to enhance the economy and environmental friendliness of modern civil transport aircrafts. The study on the laminar-to-turbulent transition influencing factors of the nacelle can better guide the design of laminar flow nacelle. Based on the linear stability analysis method, the double eN-method coupled with the RANS equation solver is used to establish an instability prediction method that can simultaneously calculate the N-factors of the induced transition of T-S (Tollmien-Schlichting) wave and cross flow. The method is verified through the spheroid with detailed experimental data. Then the influence factors including flow Mach number, Reynolds number, turbulence, and angle of attack on the transition of the nacelle are examined. The results show that the obvious change of pressure gradient caused by Mach number and angle of attack or sideslip angle will lead to the change of transition position, whereas the Reynolds number and the turbulence intensity have relatively little influence on transition position under high Reynolds number condition, because the range of transition position movement is no more than 5% of the nacelle length. Therefore, in the design stage, it is better to maintain the positive pressure gradient on the upstream of the nacelle as large as possible. |
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| Keywords: | natural laminar flow nacelle double eN method linear stability analysis transition judgment transition influencing factors |
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