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Analysis and Experimental Testing of S-97 RAIDER Propeller

机译:S-97 Raider推进器的分析与实验测试

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The S-97 RAIDER helicopter uses an aft-mounted propeller for auxiliary propulsion. This propeller is designed to operate at high thrust coefficients relative to traditional fixed-wing aircraft propellers because of requirements that include reverse thrust capability at high speed and a propeller diameter constrained by different landing scenarios. The S-97 propeller was designed with boundary-layer-ingestion (BLI) in-mind to achieve optimal net propeller efficiency under these requirements. The combination of the expanded flight envelope and the BLI configuration (i.e., including fuselage) presents challenges for the analysis of this propeller. This paper describes analysis and experimental testing used in the development of the S-97 propeller. Subscale wind-tunnel experiments were conducted using an S-97 RAIDER airframe, an isolated propeller, and in combination with an axisymmetric simplification of the fuselage. The results were compared to Computational Fluid Dynamics (CFD) analysis using multiple solvers. The prediction from Navier-Stokes solver agreed well with test data in both isolated and BLI propellers. Fully coupled full-scale propeller and fuselage simulation showed a consistent BLI benefit in propeller performance. However, comparison of the computed airframe wake field with measured data indicated that challenges remain for current Reynolds-Averaged-Navier-Stokes simulation.
机译:S-97 Raider直升机采用拆卸螺旋桨进行辅助推进器。该螺旋桨设计成在高推力系数上操作,相对于传统的固定翼飞机螺旋桨,因为在高速下包括反向推力能力和由不同着陆场景受到限制的螺旋桨直径的要求。 S-97螺旋桨设计有边界层摄取(BLI)记忆,以实现这些要求的最佳净螺旋桨效率。扩展飞行包络和BLI配置的组合(即,包括机身)对该螺旋桨的分析提出了挑战。本文介绍了用于开发S-97螺旋桨的分析和实验测试。使用S-97攻略机身,隔离的螺旋桨,以及与机身的轴对称简化进行了副隧道实验。将结果与使用多个溶剂的计算流体动力学(CFD)分析进行比较。 Navier-Stokes Solver的预测很好地与隔离和BLI螺旋桨的测试数据很好。完全耦合的全尺寸螺旋桨和机身仿真在螺旋桨性能下表现出一致的BLI益处。然而,使用测量数据的计算机架唤醒场的比较表明当前雷诺平均-Navier-Stokes仿真仍然存在挑战。

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