Numerical investigation on fluid dynamic characteristics around shoulder ventilation of submarine-launched vehicle

潜射航行体肩部通气流体动力特性数值研究

¹ School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China
² Key Laboratory of Unmanned Underwater Vehicle Technology, Northwestern Polytechnical University, Xi’an 710072, China

施瑶(1988-), 西北工业大学副研究员, 主要从事跨介质航体水动力特性研究。e-mail: shiyao@nwpu.edu.cn

Received: 25 September 2020

Abstract

In order to study the influence of the ventilating cavitation flow at the shoulder of a submerged-launched vehicle on the surface hydrodynamic characteristics, a three-dimensional potential model for the shoulder ventilation of the vehicle was established based on the homogeneous multiphase flow theory, standard RNG k-ε model, Singhal cavitation model and overlapping grid technology, and the numerical simulation of the unsteady evolution process of the ventilated cavitation flow was carried out, and the cavitation flow morphology evolution, surface pressure distribution and resistance characteristics under different ventilation rates were compared. The results showed that the thickness and length of the ventilated cavitation flow in the early stage of fusion continue increased with the increasing of ventilation volume, and its thickness and length changed slightly in the later stage; when the exhaust position did not change and the ventilation volume was within a certain range, the differential pressure resistance coefficient and viscous resistance coefficient decreased with the increasing of internal pressure of the ventilated cavity.

摘要

为研究潜射航行体肩部通气空泡流对其表面流体动力特性的影响，基于均质多相流理论、标准RNG k-ε模型、Singhal空化模型以及重叠网格技术，建立三维潜射航行体肩部通气模型，开展通气非定常空泡流演变过程数值模拟研究，对比了不同通气量下空泡流形态演化、表面压力分布以及阻力特性。结果表明：当通气量增加到一定值后，通气空泡流在融合前期其厚度与长度不断增大，后期其厚度和长度基本保持不变；当排气位置不变、通气量在一定范围的条件下，通气空泡内压增大，压差阻力系数和黏性阻力系数呈减小趋势。