应用粗糙度减轻螺旋桨叶尖涡流
Propeller Tip Vortex Mitigation By Roughness Application
摘要：
在这项研究中，表面粗糙度的应用模型和全尺寸的船用螺旋桨，以减轻尖端涡空化进行了评估。为了对湍流进行建模，采用SST kOmegamodel和曲率修正来模拟叶尖涡流传播的适当网格分辨率上的流动，根据我们之前的指南，每个涡流直径至少有32个单元。粗糙度的影响是由修改后的壁函数。分析的重点是两种类型的涡出现在船舶螺旋桨：尖端涡发展在较低的前进比号码和前缘尖端涡发展在较高的前进比号码。结果表明，由于这两种类型的涡流的起源和形成不同，需要不同的粗糙度模式，以减轻它们相对于性能退化的螺旋桨性能。我们的研究结果表明，叶尖粗糙度和前缘有限面积的组合是最佳粗糙度模式，可以实现叶尖涡空化缓解和性能下降之间的合理平衡。这种模式在模型比例条件下，导致平均TVC减轻37%，平均性能下降1.8%，而在全尺寸条件下，平均TVC减轻22%，性能下降1.4%。
英文摘要：
In this study, the application of surface roughness on model and full scale marine propellers in order to mitigate tip vortex cavitation is evaluated. To model the turbulence, SST kOmegamodel along with a curvature correction is employed to simulate the flow on an appropriate grid resolution for tip vortex propagation, at least 32 cells per vortex diameter according to our previous guidelines. The effect of roughness is modeled by modified wall functions. The analysis focuses on two types of vortices appearing on marine propellers: tip vortices developing in lower advance ratio numbers and leading-edge tip vortices developing in higher advance ratio numbers. It is shown that as the origin and formation of these two types of vortices differ, different roughness patterns are needed to mitigate them with respect to performance degradation of propeller performance. Our findings clarify that the combination of having roughness on the blade tip and a limited area on the leading edge is the optimum roughness pattern where a reasonable balance between tip vortex cavitation mitigation and performance degradation can be achieved. This pattern in model scale condition leads to an average TVC mitigation of 37% with an average performance degradation of 1.8% while in full scale condition an average TVC mitigation of 22% and performance degradation of 1.4% are obtained.
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