|Alternative Title||Study of parametric modelling and cavitation characteristics of high-speed unmanned surface vehicle with small water-plane area|
|Keyword||小水线面 通气空化 自然空化 阻力特性 计算流体动力学|
|Place of Conferral||沈阳|
The submerged bodies of the SWATH high-speed USV are similar to underwater vehicles. Cavitation reduction methods used in the ultra high-speed underwater vehicles can be used as reference in high-speed navigation. In this thesis, with the drag reduction of the SWATH high-speed USV as the goal, with the cavitation drag reduction and computational fluid dynamic (CFD) as the means, research works about resistance, nature cavitation and ventilated cavitation hydrodynamic characteristics are carried out, which guide the configuration modeling and design of the SWATH high-speed USV. At last, design results are verified by water tuunel experiments and self-propulsion model tests. The detailed contents are as follows: (1) In order to provide a research object of resistance characteristics in non cavitation state, the research on the parameterized modeling method of the SWATH high-speed USV was first carried out. During modeling, based on the uniform rational B spline curve, a B spline curve generated and controlled by both value points and characteristic points was proposed, which was used to generate the profile of the submerged bodies' hull and struts. And the SWATH USV model was established. A calculation method of resistance characteristic with non cavitation based on CFD was studied. The numerical calculation method accuracy of resistance characteristics was validated by towing tank experimental datas. Various parameters in the numerical calculation process were calibrated. The validated numerical calculation method was adopted to analyze the resistance characteristics of the SWATH high-speed USV model in the whole speed range. (2) Aiming at the problem that the resistance of the SWATH high-speed USV increases with cruising speeds, the natural cavitation drag reduction method adopted by the supercavitating torpedo was used as reference. The natural cavitation characteristics of the submerged bodies on the SWATH high-speed USV were studied. The evaporation coefficient and condensation coefficient of cavitation model in natural cavitation numerical calculation are calibrated by previous experimental datas. And the accuracy of the numerical calculation method of natural cavitation was further verified by theoretical / empirical formula. The validated natural cavitation numerical calculation method was used to analyze cavitation characteristics of different submerged body types. For the demand of wet surface of the submerged bodies, partial super cavitation thought was proposed through analyzing cavity size ranges under different cavitation numbers. A partial supercavitation configuration was established, which consist of a cavitator, an ellipsoid streamline body and flankings. Natural cavitation characteristics of the partial supercavitation configuration were analyzed. Analysis results showed that the partial supercavitation configuration could meet the design requirements of the USV's submerged bodies. The results provided ideas to design the SWATH high-speed USV submerged bodies with the nature cavitation drag reduction method. (3) In view of the problem that the natural cavitation of the submerged bodies required a high speed and was not easy to control, the feasibility of applying the ventilated cavitation drag reduction method to the USV's submerged bodies was proposed. The accuracy of the ventilated cavitation numerical calculation method was validated by former water tunnel experimental results. Ventilated cavitation characteristics of the partial supercavitation configuration were numerically studied, which guide the improved design of the configuration. The submerged body configuration were finally formed which consist of a cavitator, an ellipsoidal streamline body and edges. Ventilated cavitation characteristics and resistance characteristics were studied by water tunnel experiments. The water tunnel experiment results verified the design method of the submerged body configuration guided by numerical calculation. Finally, the design guidelines of the submerged bodies on the SWATH high-speed USV with ventilated cavitation drag reduction method were formed. (4) The design guidelines of the SWATH high-speed USV submerged bodies were adopted to establish the submerged bodies. The B spline curves generated and controlled by both value points and characteristic points were used as strut lines. The strut models were generated. The SWATH high-speed USV model were established. The numerical calculation method were used to analyze the resistance characteristics with non cavitation and ventilated cavitation characteristics of the USV model. The influences of the distance between the submerged bodies, cruising speeds and draught depths on the drag characteristics and cavitation characteristics were analyzed. The shrinkage model of the SWATH high-speed USV was designed and developed. And self propulsion tests were carried out in a basin. The drag reduction mechanism of ventilated cavitation drag reduction method is demonstrated and verified for the SWATH high-speed USV model. The research results in this thesis provide theoretical basis and guidance standard for the design of the submerged body configuration for the SWATH high-speed USV with cavitation drag reduction method. They lay the technical foundation for the application of the ventilated cavitation drag reduction technology on the SWATH high-speed USV.
|王超. 小水线面高速无人艇参数化建模与空化特性研究[D]. 沈阳. 中国科学院沈阳自动化研究所,2018.|
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