刘亦鹏,陈莹,高云海,郭传亮,焦仁山.雷诺数对增升装置流动特性影响的计算研究II——缝道流动特性[J].民用飞机设计与研究,2018,(1):39-
雷诺数对增升装置流动特性影响的计算研究II——缝道流动特性
Calculation Research on the Effect of Reynolds Number on the High Lift Device Flow Characteristcs II—Slot Flow Characteristics
  
DOI:10.19416/j.cnki.1674-9804.2018.01.008
中文关键词:增升装置  缝道流动  边界层  雷诺数  数值模拟
英文关键词:high lift device  slot flow  boundary layer  Reynolds number  numerical simulation
基金项目:
作者单位
刘亦鹏,陈莹,高云海,郭传亮 上海飞机设计研究院上海201210 
焦仁山 中国航空工业空气动力研究院哈尔滨150001 
中文摘要:在1×106~30×106的雷诺数范围内,马赫数为0.197的情况下,计算并分析了NHLP 2D多段翼型的缝道流动规律,提出了依据缝道出口速度分布定义名义边界层厚度δ/c的方法。研究发现,δ/c随雷诺数的增大而单调减小,且减小速度随雷诺数的增大而明显减缓,符合雷诺数对边界层的影响规律,说明本文定义的δ/c可用于多段翼型边界层厚度的定量研究。对于缝翼缝道,主翼壁面处的δ/c高于缝翼尾缘处的,且二者随迎角的变化规律相反。襟翼缝道处于主翼的强下洗流场中,襟翼上的δ/c随迎角几乎不变。当1×106≤Re≤2×106时,缝道边界层总厚度δT/c随雷诺数有明显的变化,当Re≥3×106时,δT/c随雷诺数的变化率减小。本文研究范围内,δT/c都没有严格地进入雷诺数自准区。当Re≥15×106时,δT/c随雷诺数接近线性变化趋势,为雷诺数规律的外推提供了参考。
英文摘要:The slot flow characteristcs of NHLP 2D multi element airfoil was calculated and analysed within the Reynolds number range from 1×106 to 30×106 and Mach number 0.197. A nominal boundary layer thickness δ/c was defined according to the velocity distribution at the exit of slot. δ/c decreases monotonically as Reynolds number increases. And the decreasing rate of δ/c also decreases with Reynolds number which is in accordance with the effect of Reynolds number on boundary layer. The δ/c defined here can be used in the quantitative research on multi element airfoil boundary layer thickness. For the slat slot, δ/c on main element is higher than that on slat trailing edge. And δ/c changes oppositely on the two region. The flow in flap slot is strongly affected by the down wash of main element. As a result, δ/c on flap hardly changes with incidence. At the range of 1×106≤Re≤2×106, total boundary layer thickness δT/c changes significantly with Reynolds number. At the range of Re≥3×106, δT/c decreases slowly with Reynolds number. Within the scope of current study, δT/c does not enter the prospective area of Reynolds number. The δT/c shows a linear reduction with Reynolds number as Re≥15×106 which provides reference for extrapolation of Reynolds number effect.
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