Research Papers: Flows in Complex Systems

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

[+] Author and Article Information
Guihui Ma

School of Energy Science and Engineering,
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

Jianyang Yu

School of Energy Science and Engineering,
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

Zenan Mu

School of Energy Science and Engineering,
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 140(9), 091103 (Apr 19, 2018) (14 pages) Paper No: FE-17-1644; doi: 10.1115/1.4039519 History: Received October 07, 2017; Revised February 27, 2018

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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Fig. 1

(a) Schematic of vertical launching process of an underwater vehicle with horizontal motion and (b) schematic of pressure-equalizing exhaust as well as its relevant basic physical problem

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Fig. 2

(a) Geometry model, (b) computational domain of 1DOF, and (c) computational domain of 2DOF and 3DOF

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Fig. 3

Schematic of vertical gas ejection system of a projectile with horizontal moving ability

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Fig. 4

Experimental and numerical results of a projectile and its trail bubble at a certain typical moment

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Fig. 5

Comparison of pressure coefficient p¯ among different amounts of mesh at T¯=1.0 and the nearby mesh of exhaust holes in case 3: 9,490,000

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Fig. 6

(a) Evolution of air film as vehicle moves (numbers in each picture isT¯) and (b) distribution of streamlines and phase volume fraction α on the symmetry and exterior of vehicle at T¯=2.0

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Fig. 7

(a) and (b) Distribution of pressure coefficient p¯ along the axial line of vehicle surface at different T¯ in single-row and double-row hole case, and (c) distribution of phase volume fraction α and pressure coefficient p¯ on vehicle surface and symmetry plane at T¯=0.5,1.0,2.0

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Fig. 8

Temporal variation of exhaust mass flow rate and film length

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Fig. 9

Distribution of phase volume fraction α, pressure coefficient p¯, surface streamlines and three-dimensional streamlines near the exhaust holes at T¯=0.5,1.0,2.0

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Fig. 10

Distribution of phase volume fraction α, and streamlines on the vehicle surface and some axial sections

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Fig. 11

Distribution of phase volume fraction α, streamlines on vehicle surface and symmetry plane and the relevant flow pattern at T¯=2.0

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Fig. 12

(a) The schematic of the circumferential plane expanded from vehicle surface, (b), and (c) the distribution of phase volume fraction α, and pressure coefficient p¯ on the circumferential expanded plane

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Fig. 13

Temporal variation of pressure coefficient and mass flow rate of holes and chamber on windward and leeward sides of vehicle

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Fig. 14

Distribution of phase volume fraction α and pressure coefficient p¯ on the circumferential expanded plane in 3DOF condition at T¯=1.5

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Fig. 15

(a) Definition of nondimensional F¯x,M¯x, and (b) their distribution along the axial line of vehicle at T¯=1.5

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Fig. 16

Distribution of phase volume fraction α and pressure coefficient p¯ on the circumferential expanded plane of no exhaust, single-row hole exhaust and double-row hole exhaust in 3DOF condition

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Fig. 17

Distribution of nondimensional F¯x,M¯x along the axial line of vehicle at T¯=2.0

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Fig. 18

Temporal variation of nondimensional angle velocity, pithing moment, and attitude of vehicle, as well as the nondimensional trajectory of vehicle in xy-plane




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