船舶艏侧推器脉动压力数值计算

以艏侧推桨为研究对象,采用有限体积法,通过求解非定常RANS(Reynolds-Averaged Navier-Stokes)方程对槽道流场进行了数值模拟得到槽道壁的脉动压力,为结构减振优化设计提供初始数据输入.数值模拟得到的脉动压力与试验结果吻合良好,压力脉动集中在桨叶梢附近小块区域.通过对比不同来流方向的脉动压力,发现船舶正前方和正后方来流时,压力脉动值分别出现极小值和极大值,压力脉动情况与流场复杂性相关,水流越顺畅,压力脉动值越小,反之亦然.数值模拟得到的槽道内及螺旋桨叶片上完整的压力云图可为结构优化设计提供重要参考数据,具有工程实用价值.

Numerical Study of Pressure Fluctuation for Bow Thruster

Abstract： A bow thruster is the main research object. In order to obtain the initial data for the optimization of structural design, the flow field in the tunnel is numerically simulated through solving the unsteady Reynolds averaged Navier Stokes (RANS) equations by the finite volume method and the analysis on the pressure fluctuation is carried out. The numerical results agree very well with the measured data of the model test. The pressure fluctuation is concentrated in small area near the blade tip. By comparing the pressure fluctuation on the tunnel wall under different flow directions, it is found that the pressure fluctuation reaches the minimum and maximum value respectively when the flow is coming from the front and the back of the ship. Furthermore, the study shows that the fluctuating pressure is related to the complexity of the flow field. The smoother the flow is, the smaller the fluctuating pressure becomes, and vice versa. Due to the high precision of the numerical simulation, the results obtained in the paper are of great reference value for optimal design of structures. Therefore, the study is of profound practical significance in engineering.