Pressure-equalizing film is a slice of air film generated through exhausting and attached to the vehicle's exterior with nearly uniform inner pressure. Similar to ventilated cavity in composition, but of interest, here is the weakening of pitching moment and environment disturbance that the film offers, the film's forming speed and covering range upon vehicle determine the improvement effect of vehicle's trajectory stability as it emerges from water. This paper established a numerical approach to investigate the effect of single and double rows of venting holes on the evaluation of air film along vehicle's exterior, at the same time its influence on the trajectory stability of vehicle with three degrees-of-freedom (3DOF) motion is also analyzed. Results indicate that reverse flow forms between row-to-row spacing when exhausting with two rows of holes, which enhances the exhausting process with the film's size enlarged and axial length extended, meanwhile it brings about more complex vortices structure near venting holes compared to the single-row hole case. As for the 3DOF cases, the pressure difference between vehicle's front and back sides is dramatically reduced attributing to the existence of attached air film, consequently the rotation of vehicle is weaken, leaving a better attitude to vehicle after it piercing water surface. Besides, the rapid formation of air film in double-row hole cases is advantage for the timely inhibiting of vehicle's pitching motion compared to the single-row hole cases, and their weaker stagnation high pressure near film's closure region is also good for the reduction of vehicle's lateral load.
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September 2018
Research-Article
Effect of Pressure-Equalizing Film on Hydrodynamic Characteristics and Trajectory Stability of an Underwater Vehicle With Injection Through One or Two Rows of Venting Holes
Guihui Ma,
Guihui Ma
School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: 15B902026@hit.edu.cn
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: 15B902026@hit.edu.cn
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Fu Chen,
Fu Chen
School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: chenfu@hit.edu.cn
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: chenfu@hit.edu.cn
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Jianyang Yu,
Jianyang Yu
School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: yujianyang@hit.edu.cn
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: yujianyang@hit.edu.cn
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Yanping Song,
Yanping Song
School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: songyanping@hit.edu.cn
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: songyanping@hit.edu.cn
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Zenan Mu
Zenan Mu
School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: muzenan@foxmail.com
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: muzenan@foxmail.com
Search for other works by this author on:
Guihui Ma
School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: 15B902026@hit.edu.cn
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: 15B902026@hit.edu.cn
Fu Chen
School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: chenfu@hit.edu.cn
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: chenfu@hit.edu.cn
Jianyang Yu
School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: yujianyang@hit.edu.cn
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: yujianyang@hit.edu.cn
Yanping Song
School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: songyanping@hit.edu.cn
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: songyanping@hit.edu.cn
Zenan Mu
School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: muzenan@foxmail.com
Harbin Institute of Technology,
Harbin 150001, Heilongjiang, China
e-mail: muzenan@foxmail.com
1Corresponding author.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 7, 2017; final manuscript received February 27, 2018; published online April 19, 2018. Assoc. Editor: Shawn Aram.
J. Fluids Eng. Sep 2018, 140(9): 091103 (14 pages)
Published Online: April 19, 2018
Article history
Received:
October 7, 2017
Revised:
February 27, 2018
Citation
Ma, G., Chen, F., Yu, J., Song, Y., and Mu, Z. (April 19, 2018). "Effect of Pressure-Equalizing Film on Hydrodynamic Characteristics and Trajectory Stability of an Underwater Vehicle With Injection Through One or Two Rows of Venting Holes." ASME. J. Fluids Eng. September 2018; 140(9): 091103. https://doi.org/10.1115/1.4039519
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