变角度尾压浪板对断级滑行艇阻力性能的影响

为了研究尾压浪板安装角对断级滑行艇阻力性能的影响,对尾压浪板安装角β=2°,3°,4.5°的双断级滑行艇模型进行试验研究,并利用计算流体动力学软件CFX对容积Froude数Fr_▽=0.44~5.20的模型绕流场进行模拟,分析了尾压浪板的作用机制,以及不同β角的尾压浪板的水动力特性,探讨了尾压浪板安装角对断级后空穴和各滑行面负荷系数的影响.结果表明,增大尾压浪板安装角,可使断级滑行艇得到较好的低速阻力性能,并且在对高速段阻力影响较小的同时提高发生海豚运动的临界速度.

Influence of Angle Variable Stern Flap on#br#Resistance Performance of Stepped Planing Hull

Abstract： In order to study the effects of the mounting angle of stern flap on the resistance performance of stepped planing hull, we carried out a series of model tests for a double stepped planing hull with flap mounting angle β=2°, 3°, 4.5°. A finite volume method (FVM) based computational fluid dynamics (CFD) software CFX was used to simulate the flow field around the tested models at the volume based Froude numbers ranging from 0.44 to 5.20. The operating mechanism of the flap and the effects of mounting angle on the hydrodynamic characteristics were analyzed. Comparisons of air cavities after steps and load coefficient of planing surfaces between different models were presented and discussed. The experimental and numerical results showed that increasing the mounting angle could improve the low speed resistance performance and increase the critical velocity at which porpoising would happen, whereas only less resistance increase could be observed at high speed.