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首页> 外文会议>AIAA modeling and simulation technologies conference 2015 >Development of a Reduced Order Model to Study Rotor/Ship Aerodynamic Interaction
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Development of a Reduced Order Model to Study Rotor/Ship Aerodynamic Interaction

机译：降阶模型的研究以研究转子/船的空气动力相互作用

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Rotor/ship aerodynamic interaction is a challenging problem that significantly affects various aspects of shipboard rotorcraft operations, including performance, stability, control, and loads. Therefore it is essential to accurately capture this interaction for application in both engineering analysis and real time flight simulation. The complicated aerodynamic interaction requires a first principle based solution for needed accuracy. However, CFD is computationally expensive and cannot be directly used in flight simulation and therefore, CFD generated ship airwake has traditionally been applied using table lookup methods in rotorcraft analysis and flight simulation. These methods are limited by the capability of computational systems to store large amounts of pre-generated ship airwake interference data. Moreover, when mutual aerodynamic interaction is considered, the airwake table is governed by a large number of rotor and ship parameters which further dramatically increases the table dimension and the storage overhead and restricts the ability to perform a rigorous rotor/ship interaction study that can capture all the essential aerodynamic phenomena. A POD based Reduced Order Model (ROM) was developed to address the limitations of using a table lookup method. The ROM is an Ordinary Differential Equation (ODE) approximation of the CFD governing equations that can effectively model the fundamental physical phenomena in a computationally efficient manner. The ROM was calibrated to improve its stability and was validated for a 2-D cylinder case where it showed excellent correlation with CFD results. This ROM was further tested for an isolated ship case and one with a coupled rotor disk and ship model. The model shows reasonable predictions for both the cases, though the rotor/ship case is seen to be more complex to model using ROM due to the strong coupling between rotor and ship airwake that creates a highly unsteady aerodynamic environment.
机译：旋翼/舰船的气动相互作用是一个具有挑战性的问题，它会严重影响舰载旋翼飞机的各个方面，包括性能，稳定性，控制力和载荷。因此，至关重要的是要准确地捕获这种相互作用，以便在工程分析和实时飞行仿真中应用。复杂的空气动力学相互作用需要基于第一原理的解决方案才能获得所需的精度。但是，CFD的计算量很大，不能直接用于飞行仿真，因此，传统上，CFD生成的船舶空中唤醒通常是通过查表方法应用于旋翼飞机分析和飞行仿真中的。这些方法受到计算系统存储大量预先生成的船舶空中唤醒干扰数据的能力的限制。此外，当考虑到相互之间的空气动力相互作用时，空中唤醒表受大量的旋翼和轮船参数控制，这进一步极大地增加了表的尺寸和存储开销，并限制了进行可捕获的严格的旋翼/船相互作用研究的能力所有基本的空气动力学现象。开发了基于POD的降序模型（ROM）以解决使用表查找方法的局限性。 ROM是CFD控制方程的常微分方程（ODE）近似，可以有效地以计算有效的方式对基本物理现象进行建模。 ROM进行了校准，以提高其稳定性，并针对二维圆柱体情况进行了验证，该案例显示出与CFD结果的极佳相关性。对该ROM进行了进一步测试，以检查其是否是隔离的船壳以及带有耦合的转子盘和船模的船壳。该模型对这两种情况都给出了合理的预测，尽管由于使用转子和船舶尾气之间的强耦合会产生高度不稳定的空气动力学环境，因此使用ROM建模转子/船情况更为复杂。

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