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Hydrodynamic modeling and experimental validation of a cycloidal propeller

机译：摆线螺旋桨的流体动力学建模和实验验证

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In this paper, a lower-order unsteady hydrodynamic model of a cycloidal propeller along with in-house experiments to validate the model is presented. Towards this, the hydrodynamics of a cycloidal propeller is investigated thoroughly and various underlying physical phenomena such as dynamic virtual camber, effects of near and shed wake, leading-edge vortices are rigorously modeled. It is shown that the chord-wise variation of incidence velocity angle on cycloidal propeller blade is manifested as dynamic virtual camber, which depends on curvilinear flow geometry, pitch angle, pitch rate and inflow distribution. By including all these effects together, a generalized expression of additional lift due to virtual camber effect is developed. To capture the effects of near wake, a nonlinear lifting line model is incorporated. Rapid pitching of rotor blades produces unsteady phenomena such as strong leading-edge vortices and shed wakes. Polhamus leading-edge-suction analogy is applied to model leading edge vortex. To capture the effects of shed wake, a method based on Theodorsen's approach is developed. A modified Double Multiple Streamtube (D-MS) model is used for modeling the complex inflow characteristics of a cycloidal propeller. The present hydrodynamic model is validated with measured time-history of forces obtained from in-house experiments at low Reynolds numbers.
机译：本文提出了摆线螺旋桨的低阶非定常流体力学模型，并进行了室内实验以验证该模型。为此，对摆线螺旋桨的流体动力学进行了深入研究，并对各种潜在的物理现象（例如动态虚拟外倾角，近尾流和尾流的影响，前沿涡旋）进行了严格建模。结果表明，摆线螺旋桨叶片入射速度角的弦向变化表现为动态虚拟外倾角，其取决于曲线的流动几何形状，桨距角，桨距速率和流入分布。通过将所有这些效果放在一起，可以开发出由于虚拟外倾效应而产生的附加升力的通用表达。为了捕获接近尾声的影响，引入了非线性提升线模型。转子叶片的快速变桨会产生不稳定的现象，例如强大的前缘涡旋和脱落的尾流。 Polhamus前缘吸力类比应用于前缘涡旋模型。为了捕获流苏的影响，开发了一种基于Theodorsen方法的方法。改进的双重多重流管（D-MS）模型用于对摆线螺旋桨的复杂流入特性进行建模。本流体力学模型通过在低雷诺数下从室内实验获得的力的时间历程进行了验证。

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