快艇气泡减阻的原理研究与相似比分析

分析了高速气泡船气液两相流动的特征,进而将气泡船复杂的三维流动简化为两维人工气泡绕流的两相流物理模型,并提出了两维人工气泡绕流的相似律.采用有限体积法和VOF方法,建立了两维人工气泡绕流的数学模型.应用该数学模型,研究了气泡船在无气泡、气泡封闭、气泡半开三种典型绕流时的气液流场特性,得到了气泡长度、气泡形状随来流速度、气泡腔压力、气体流量的变化规律,分析得出了在高速气泡船底部形成稳定气泡的力学条件.相关研究结果对高速气泡船底部气泡腔的设计具有指导意义.

Principle Study of Bubble Drag Reduction and Silmlarity Analysis for High Speed Vehicles

The hydrodynamic characteristic of flow around high speed vehicles is analysed. The complicated 3-dimensional flow field is simplified into 2-dimension. Three flow patterns, named by au thor as no-bubble, closed-bubble and half-open-bubble, are conceived for the bubble boat flow and the similarity principles are presented for every flow pattern. By infinite element and VOF method, a math model is constructed for the 2-dimensional flow around bubble. The relationship among the bubble and the variables, such as water speed, air pressure, air volume speed, is studied through numerical tests. The results of the study can guide the design of bubble boat.