高速滑行艇约束模式下的喷溅阻力特性研究

Research on spray resistance characteristics of a high-speed planing craft hydrostatic sailing

为了研究高速滑行艇瞬态喷溅流体动力特性,基于计算流体软件Fluent及自编写后处理程序,对体积傅汝德数、攻角分别为Fr▽=1.0、τ=10°,Fr▽=2.0、τ=8.0°,Fr▽=3.0、τ=5.0°,Fr▽=4.0、τ=2.5°这4种工况下,开展了高速滑行艇三维数值模拟.计算收敛后,从Fluent软件中导出艇体平均动压、对水相积分求出浸湿面积等相关参数、提出了关于计算喷溅阻力的4条假设和关于喷溅区的几何形状、特征雷诺数与喷溅阻力的计算方法.计算结果与试验值具有良好的一致性,摩擦阻力系数Cf通过Davidson经验公式和ITTC公式的反推验证,误差分别为2.58%和3.36%,表明采用此种方法研究高速滑行艇静水航行喷溅阻力是可行的.

The research study developed a three dimensional （3-D） numerical simulation of a high speed planing craft, for the purpose of examining the spray resistance characteristics of high-speed planing craft hydrostatic sailing. The study aims to examine the four conditions of different attack angle ^- and volume Froude number Frv where Fr▽= 1.0、τ= 10°,Fr▽= 2.0、τ= 8.0°,Fr▽=3.0、τ=5.0°,Fr▽=4.0、τ= 2.5°4 based on the computational fluid software Fluent and self programmed handler. As the computation converges, average dynamic pressure of the craft is exported from the Fluent, and other relevant parameters such as the wetted surface area are derived through the integration of aqueous phase. The authors raised four assumptions about calculating the splash resistance, and the methods for calculating the geometrical shape of the splash zone, characteristic Reynolds number and the splash resistance. The calculation results were well consistent with relevant tests. The friction factor C/was recalculated through Davidson＇s empirical formula and the ITI＇C formula, finding the errors of 2.58% and 3.36%, respectively. The results indicate the selected method for spray resistance of high-speed planing craft in still water splash displayed feasible outcomes