ABSTRACT

Hydrodynamic coefficients including thrust, torque and efficiency at different advance ratios are investigated for all components of a Linear-Jet propulsion system. Ansys-CFX software is utilised and URANS equations are solved by the SST $k-\omega$ turbulent model. Pressure on high- and low-pressure sides of the stator at different spans is computed based on different axial gap size between stator and rotor as well as chord of the rotor in the propulsion system. The computed thrust and torque coefficient as well as efficiency are validated by available experimental data for a ducted propeller. The obtained pressure distribution indicates different fluctuations caused by the interaction of rotor and stator. These oscillations and vibrations are the main cause of damage to the ship hull and the propulsion system. To study these phenomena, unsteady forces applied on the stator at different distances between the rotor and the stator for various time steps are investigated.

摘要

研究了线性喷气推进系统的所有组件在不同提前比下的水动力系数，包括推力、扭矩和效率。使用 Ansys-CFX 软件，通过 SST 求解 URANS 方程$ķ-\omega$湍流模型。根据定子和转子之间不同的轴向间隙尺寸以及推进系统中转子的弦长，计算不同跨距的定子高压侧和低压侧的压力。计算出的推力和扭矩系数以及效率已通过导管螺旋桨的可用实验数据进行验证。获得的压力分布表明转子和定子相互作用引起的不同波动。这些振荡和振动是损坏船体和推进系统的主要原因。为了研究这些现象，研究了在不同时间步长下，在转子和定子之间不同距离处施加在定子上的非定常力。