Unsteady Lift of an Oscillating Wing below Free-Surface
自由表面下振荡机翼的非定常升力
基本信息
- 批准号:01550354
- 负责人:
- 金额:$ 1.09万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for General Scientific Research (C)
- 财政年份:1989
- 资助国家:日本
- 起止时间:1989 至 1990
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
A new numerical method has been developed to analyze unsteady hydrodynamic forces of 3D lifting surface of arbitrary plan form in infinite flow, in which velocity potential is expressed by the doublet distribution over wing and the wake. The results by this method show good agreement with existing theories and experiments for some rectangular and triangular wings in steady and unsteady problems.For 2D wings below free-surface, an integral equation method which includes the free-surface effects and the thickness of the wing exactly is developed. Following conclusions are obtained from numerical calculations and experiments.1) There is non-zero attack angles where the lift of the wing becomes zero.2) Thickness of the wing section does not affect hydrodynamic forces so much that thin wing would give good approximation.3) Free-surface effects on hydrodynamic forces appear at the ratio of the oscillating frequency to the uniform flow velocity takes some values.
本文提出了一种新的数值方法来分析无限大来流中任意平面形状的三维升力面的非定常水动力,其中速度势用机翼和尾流的偶极子分布来表示。对于矩形和三角形机翼的定常和非定常问题,该方法的计算结果与已有的理论和实验结果吻合较好;对于自由面以下的二维机翼,建立了一种精确考虑自由面效应和机翼厚度的积分方程方法。通过数值计算和实验研究,得到了以下结论:1)机翼升力为零时存在非零攻角; 2)机翼厚度对水动力的影响不大,薄机翼可以给出很好的近似; 3)自由面对水动力的影响出现在振荡频率与均匀流速之比取一定值时。
项目成果
期刊论文数量(11)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Kyozuka, Y., Hori, T. and Koterayama, W.: "Experimental Study on Unsteady Lift of Oscillating Wings" Proc. First Pacific/Asia Offshore Mech. Symp.Vol. 2. 87-93 (1990)
Kyozuka, Y.、Hori, T. 和 Koterayama, W.:“振荡翼非定常升力的实验研究”Proc。
- DOI:
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Kyozuka, Y., Hori, T. and Koterayama, W.: "Unsteady Hydrodynamic Forces on a Lifting Body, (First Report)" J. Soc. Nav. Archit. Japan. Vol. 167. 43-53 (1990)
Kyozuka, Y.、Hori, T. 和 Koterayama, W.:“升力体上的不稳定水动力,(第一份报告)”J. Soc。
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経塚 雄策,堀 勉,小寺山 亘: "水中揚力体に加わる非定常流体力について(第二報)" 日本造船学会論文集. 168. 245-253 (1990)
Yusaku Kyozuka、Tsutomu Hori、Wataru Koterayama:“关于应用于水下提升体的非定常流体力(第二份报告)”日本造船学会汇刊 168. 245-253 (1990)。
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- 影响因子:0
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経塚 雄策, 堀 勉, 小寺山 亘: "水中揚力体に加わる非定常流体力について(第二報)" 日本造船学会論文集. 168. 245-253 (1990)
Yusaku Kyozuka、Tsutomu Hori、Wataru Koderayama:“关于应用于水下提升体的不稳定流体力(第二份报告)”日本造船学会汇刊 168. 245-253 (1990)。
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- 影响因子:0
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Y.Kyozuka,T.Hori,W.Koterayama: "Experimental Study on Unsteady Lift of Oscillating Wings" Pacific/Asia Offshore Mechanics Symposium. (1990)
Y.Kyozuka,T.Hori,W.Koteayama:“振荡翼非定常升力实验研究”太平洋/亚洲海上力学研讨会。
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KYOZUKA Yusaku其他文献
KYOZUKA Yusaku的其他文献
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