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Supervised by Ministry of Industry and Information Technology of The People''s Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Related citation:Qingtong Chen,Guanggen Yang.Study on the Effect of Two-Dimensional Helicopter V-buoy’s Way of Water Entry on Water Impact[J].Journal of Harbin Institute Of Technology(New Series),2019,26(3):91-96.DOI:10.11916/j.issn.1005-9113.18047.
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Study on the Effect of Two-Dimensional Helicopter V-buoy’s Way of Water Entry on Water Impact
Qingtong Chen,Guanggen Yang
(China Helicopter Research and Development Institute, Jingdezhen 333000, Jiangxi,China)
Abstract:
To analyze the effect of the way of water entry on water impact, the FLUENT software was adopted to simulate a two-dimensional (2D) helicopter V-buoy’s free fall and forced fall at a constant velocity. Combining with the UDF program and the dynamic mesh model, the standard k-ε turbulence model was used and the VOF technique was adopted to capture free surface. The physical parameters such as velocity and force were calculated and compared with those results of boundary element method with good agreement obtained. It was found that the force of 2D V-buoy at a constant velocity was much greater than that in free fall motion. Meanwhile, the maximum pressure coefficients Cpmax in both cases were almost equal and the dimensionless water-entry depths y' corresponding to Cpmax were also similar.
Key words:  helicopter  2D V-buoy  the way of water entry  water impact  FLUENT  VOF
DOI:10.11916/j.issn.1005-9113.18047
Clc Number:V219
Fund:
Descriptions in Chinese:
  

直升机二维V型浮筒着水方式对着水砰击影响的研究

陈庆童、杨广根

(中国直升机设计研究所, 江西 景德镇 333000)

创新点说明:

为分析二维楔形浮筒不同着水方式(自由落体着水和恒定速度着水)对着水砰击的影响,探讨着水方式对着水砰击计算的适用性。基于fluent软件,选取标准K–ε湍流模型,采用VOF方法捕捉自由液面,结合UDF程序和动网格模型来模拟二维楔形浮筒自由着水和定速着水时的着水问题,得出着水过程中的速度、砰击载荷等,结果表明fluent计算值与理论计算值相对应;对自由着水和定速着水所受到的砰击力进行了对比分析,结果表明定速着水时所受到的砰击力远远大于自由落体;对自由着水和定速着水时的压力系数Cp和无量纲着水深度Z进行了对比分析,结果表明两者Cpmax几乎一样,且Cpmax所对应的Z也是相等的.

研究目的:

验证着水砰击计算方法,详尽分析比较不同着水方式的影响,同时也为下一步的着水仿真及着水试验提供技术基础及参考思路。

研究方法:

本文基于fluent软件,基于标准K–ε湍流模型,采用VOF捕捉自由液面,结合UDF程序及动网格技术,对二维楔形浮筒自由着水和定速着水进行数值模拟,将自由着水的过程中的速度、加速度以及砰击力和Wu的理论计算模型进行了对比分析;并讨论了自由着水和定速着水对砰击力F、砰击压力以及压力系数Cp的影响,探讨了着水方式对着水砰击计算的适应性

研究结果:

对二维楔形浮筒自由着水和定速着水时的砰击现象进行了数值模拟,得出了自由着水过程中速度、加速度以及砰击载荷等参数,并与Wu的理论模型以及El-Mahdi的试验结果进行了对比分析,对比结果表明计算值与理论模型值以及试验值符合的很好

结论:

1)对于自由着水,随着着水时间的增加,砰击压力峰值逐渐减小,压力峰值位置随着楔形浮筒的下落而沿楔形浮筒的边缘移动,最大砰击压力发生在楔形浮筒斜边的底部;而对于定速着水,随着着水时间的增加,砰击压力峰值逐渐增大,压力峰值的位置随着楔形浮筒的下落而沿楔形浮筒的斜边向上移动,最大砰击压力发生在楔形浮筒斜边的顶部;

2)对于砰击压力P和砰击载荷F,定速着水对应的砰击压力和载荷均要大于自由着水;

3)对于压力系数Cp,定速着水的压力系数Cpmax以及所对应的无量纲着水深度Z和自由着水时是相当的。

关键词:直升机;二维V型浮筒;着水方式;着水砰击;FLUENT;VOF

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