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3次元変動風場における断面可変箱桁の空力特性に関する研究
1Aulin College, Northeast Forestry University, Harbin, 150040, China.
Scientific reports
|January 31, 2026
まとめ
変動風は箱桁の空力特性を著しく変化させ、抗力と揚力を減少させるが、一部の断面ではトルクを増加させる。乱流場の歪みは空力相関を増強する。
科学分野:
- 航空宇宙工学;土木工学;流体力学
背景:
- 断面可変箱桁の不規則な空力形状は、流れ場の乱れを引き起こす。;変動風は空間的な流れの特性をさらに変化させるため、調査が必要である。
研究 の 目的:
- 変動風下における断面可変箱桁の空力特性を探求すること。;周辺気流特性とその桁への影響を分析すること。
主な方法:
- 数値解析に3次元大規模渦シミュレーション(3D-LES)を用いた。;狭帯域合成乱れ生成(NSRFG)を用いて、5つの異なる変動風場をシミュレーションした。
主要な成果:
- 変動風は、風上端付近を除き、ほとんどの表面で負圧を減少させた。;抗力係数と揚力係数は、それぞれ最大13.67%と34.18%減少した。;ねじり係数は、小さい断面幅比の断面で最大21.43%増加した。
結論:
- 変動風における乱流場の歪みは、空力的な広がり相関を増強する。;変動風は渦放出の強度を変化させるが、その周波数は変化させない。
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