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Research Papers: Multiphase Flows

A Contribution to Study on the Lift of Ventilated Supercavitating Vehicle With Low Froude Number

[+] Author and Article Information
Yu Kaiping

Department of Aeronautics Engineering and Mechanics, School of Aeronautics, Harbin Institute of Technology, Harbin 150001, Chinayukp@hit.edu.cn

Zhou Jingjun

Department of Aeronautics Engineering and Mechanics, School of Aeronautics, Harbin Institute of Technology, Harbin 150001, Chinajingjun4866@163.com

Min Jingxin, Zhang Guang

Department of Aeronautics Engineering and Mechanics, School of Aeronautics, Harbin Institute of Technology, Harbin 150001, China

J. Fluids Eng 132(11), 111303 (Nov 17, 2010) (7 pages) doi:10.1115/1.4002873 History: Received November 11, 2009; Revised October 12, 2010; Published November 17, 2010; Online November 17, 2010

A ventilated cavity was investigated using three-dimensional numerical simulation and cavitation water tunnel experiments under the condition of low Froude number. A two-fluid multiphase flow model was adopted in numerical predictions. The drag between the different phases and gravitational effect, as well as the compressibility of gas, was considered in the numerical simulations. By comparing the ventilated coefficient computational results of three different turbulence models with the Epshtein formula, the shear-stress-transport turbulence model was finally employed. The phenomenon of double-vortex tube gas-leakage was observed in both numerical simulations and experiments. Based on the validity of the numerical method, the change law of the lift coefficient on the afterbody was given by numerical predictions and accorded well with experimental results. The cause for the appearance of an abrupt increase in lift was difficult to get from experiments for the hard measurement, whereas the numerical simulations provided some supplements to analyze the reasons. The distribution of lift coefficient on the afterbody had important significance to the design of underwater vehicles.

Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of water tunnel

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Figure 2

The slender rod model

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Figure 3

The fore strut model and the six-component balance

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Figure 4

Single cavitator for comparing turbulence model

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Figure 5

Comparison of simulation results of the ventilation coefficient between three different turbulence models and the Epshtein formula

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Figure 6

Computational grid for the slender rod model

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Figure 7

(a) Gas volume fraction with different grid refinements and (b) absolute pressure with different grid refinements

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Figure 8

Double-vortex tubes gas-leakage way in numerical simulation

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Figure 9

Comparison of cavity scale with different ventilation mass rates where the upper is the simulation results and the nether is the experiment results: (a) simulation result: ṁ=0.000165 kg s−1, experimental result: ṁ=0.000197 kg s−1; (b) simulation result: ṁ=0.000302 kg s−1, experimental result: ṁ=0.000329 kg s−1; (c) simulation result: ṁ=0.000622 kg s−1, experimental result: ṁ=0.000685 kg s−1; and (d) simulation result: ṁ=0.000902 kg s−1, experimental result: ṁ=0.000954 kg s−1

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Figure 10

Cavity of fore-supporting model: (a) simulation result: ṁ=0.000175 kg s−1, experimental result: ṁ=0.000198 kg s−1; (b) simulation result: ṁ=0.000274 kg s−1, experimental result: ṁ=0.000290 kg s−1; (c) simulation result: ṁ=0.000369 kg s−1, experimental result: ṁ=0.000425 kg s−1; and (d) simulation result: ṁ=0.000538 kg s−1, experimental result: ṁ=0.000567 kg s−1

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Figure 11

The change curve of lift characteristic of the afterbody with the development of the supercavity

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Figure 12

Sketch map of the positions for Cp output

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Figure 13

Cp on line on the state of Fig. 1

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Figure 14

Cp on line on the state of Fig. 1

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Figure 15

Cp on curves (a) Cp on curve 1 on the state of Fig. 1 and (b) Cp on curve 2 on the state of Fig. 1

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