用环形翼改善螺旋桨上游流场，降低振动噪声。
Thin ring wing as a means of flow improvement upstream of a propeller
- 采用环形翼作为被动涡发生器，主动调控螺旋桨前流场。
- 理论与实验均证实其能有效抑制不规则流场引起的扰动。
- 适合船舶推进系统优化，尤其适用于稳定鳍集成设计。
当前存在多种旨在减少螺旋桨上游流场不规则性并由此降低螺旋桨诱发振动和噪声的装置。其中许多是翼型涡发生器，通过自身诱导的（即被动的）纵向涡流影响流场。本文研究一种环形翼作为高效被动涡发生器的应用，可对螺旋桨叶片最负荷区域附近的流场进行控制。针对具有非对称几何形状的薄环形翼在非均匀定常流中的问题，采用线性方法求解，并估算出诱导纵向涡流强度随流场不规则性和环形翼几何形状的变化关系。拖曳水池实验结果与理论模型高度吻合，验证了该装置的有效性。同时探讨了将环形翼集成至稳定鳍结构中的若干附加优势。
原文摘要 · Abstract (English)
There are numerous devices currently known with the purpose of reducing the irregularity of the flow upstream of the propeller and to decrease by that means the propeller-induced vibration and noise. Many of these devices are wing-shaped vortex-generators that affect the flow with their induced (i.e. passive) longitudinal vortices. The paper's subject is the use of a ring-shaped wing as a highly effective passive vortex-generator which allows to control the flow closer to the most charged sections of propeller blades. The problem of a thin ring-shaped wing with irregular (asymmetric) geometry in the irregular steady flow has been solved in a linear approach and the intensity of the induced longitudinal vortices as a function of the irregularity of the flow and the geometry of the ring wing has been estimated using that solution. Experiments in the towing tank showing good concordance with the theoretical model confirmed the effectiveness of such a device. Some additional advantages of a ring-shaped wing incorporated into the construction of stabilizers are considered.
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