Optimization design of natural laminar flow nacelle based on PARSEC curve and genetic algorithm
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摘要:
为提升短舱外罩层流区域面积以降低阻力,基于PARSEC(parametric section)曲线的型线参数化方法,同时采用遗传算法,以推后短舱外罩转捩位置为优化目标,对短舱特征型线进行优化。同时,研究不同来流马赫数下短舱型面优化结果;对比分析优化前后型面的气动性能与阻力发散特性。结果表明:优化后短舱型面较优化前在设计点阻力降低2.25×10−3,但在高来流马赫数的非设计点工况,阻力恶化现象较为严重,导致优化后短舱在较低马赫数即产生阻力发散。
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关键词:
- 自然层流(NFL)短舱 /
- PARSEC曲线 /
- 遗传算法 /
- 转捩 /
- 阻力发散特性
Abstract:In order to improve the laminar flow area of the nacelle surface to reduce the drag, the parametric method of the profile based on PARSEC (parametric section) curve and genetic algorithm were used to optimize the nacelle, with its goal to push back the transition position of the nacelle. At the same time, the optimization results of nacelle under different Mach numbers were studied; the aerodynamic performance and drag divergence characteristics of the nacelle before and after optimization were compared and analyzed. The results showed that: the drag at the design point of the optimized nacelle was 2.25×10−3 lower than original nacelle, but the drag deterioration was more serious at the off design points of high Mach number, which led to the optimized nacelle drag divergence at lower Mach number.
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表 1 NFL(1)-0416层流翼型模拟与试验结果对比
Table 1. Comparison between simulation and test results of NFL (1)-0416 laminar airfoil
表 2 短舱特征型线优化前后主要型线参数对比
Table 2. Comparison of main profile parameters before and after optimization
优化特征参数 优化前 优化后 $ {r}_{\mathrm{l}\mathrm{e}\mathrm{u}\mathrm{p}} $ 34 86 $ {r}_{\mathrm{x}\mathrm{x}\mathrm{u}\mathrm{p}} $ 8916 10600 $ {X}_{\mathrm{u}\mathrm{p}} $ 890 1002 $ {Y}_{\mathrm{u}\mathrm{p}} $ 1800 1867 -
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