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首页> 外文会议>ASME Turbo Expo: Turbomachinery Technical Conference and Exposition >MODELLING AND DESIGN OF LPC COMPONENTS WITH SEMI-ANALYTICAL MODELS: PART II - DESIGN OF OPTIMAL OGV CASCADES
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MODELLING AND DESIGN OF LPC COMPONENTS WITH SEMI-ANALYTICAL MODELS: PART II - DESIGN OF OPTIMAL OGV CASCADES

机译：半分析模型LPC组件的建模与设计：第II部分 - 最佳OGV瀑布设计

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The growth in diameter of turbofan engines exacerbates problems related to the interaction of the Outlet Guide Vanes (OGV), pylon and intake because it reduces the ratio between components gaps and disturbance wavelength. The main components of this interaction are the potential fields generated by the intake and by structural components in the bypass, the pylon and the Radial Drive Fairing (RDF). The OGV bladerow and the fan are immersed in these potential fields and suffer performance degradation as well as integrity issues as a result. Simple actuator-disc analysis shows that a uniform OGV cascade amplifies the effect of the pylon potential flow. Therefore, a number of methods have been proposed over the years to compute OGV exit flow angle patterns that result in an approximately cir-cumferentially uniform static pressure field at fan exit. Within actuator disc approximations, the determination of the optimal exit flow angle pattern can be accomplished analytically but little information is obtained on how the geometry of the vanes ought to be modified. Consequently, it is not difficult to generate by this method OGV cascades that stall or choke locally. More recent contributions use CFD computations coupled to optimization methods to determine OGV patterns that reduce the distortion at the fan exit, while minimising some measure of OGV loss. Whilst in principle more rational, these methods encounter practical difficulties due the computational power needed to obtain reliable loss estimates while exploring large design spaces. In this paper the view is taken that the performance of the OGV bladerow can be preserved during the optimization process if the loading distribution of each vane is made to match the loading distribution of the nominal vane (i.e. the aerodynamic design intent with axisymmetric inlet and exit flow). As loading distributions are readily available from inviscid-type analysis, the generation of optimal OGV patterns can be accomplished with very reasonable computational expense using a method based on the model described in part I of this paper.
机译：涡轮通风发动机的直径增长加剧了与出口导叶（OGV），塔架和摄入的相互作用相关的问题，因为它降低了部件间隙与干扰波长之间的比率。该相互作用的主要部件是由进气和旁路，塔架和径向驱动整流罩（RDF）中的结构部件产生的潜在场。 OGV Bladerow和风扇浸入这些潜在的领域，并因此遭受性能下降以及诚信问题。简单的执行器 - 盘分析表明，均匀的OGV级联放大了塔电势流的效果。因此，多年来已经提出了许多方法，以计算在风扇出口处产生近似电感均匀的静态压力场的OGV出口流角度模式。在致动器盘近似下，可以分析地完成最佳出口流角度图案的确定，但是如何获得叶片的几何形状的改进的几何形状的信息。因此，通过这种方法产生OGV瀑布在本地停顿或扼流的方法并不困难。更新的贡献使用CFD计算耦合到优化方法来确定OGV模式，从而降低风扇出口处的失真，同时最小化OGV丢失的一些测量值。同时原则上更合理，这些方法由于在探索大型设计空间而获得可靠损失估计所需的计算能力，因此遇到了实际困难。在本文中，如果使每个叶片的装载分布匹配标称叶片的装载分布（即，轴对称入口的空气动力学设计意图和轴对称入口的空气动力学设计意图和轴对称入口的空气动力学设计意图和轴对称入口的空气动力学设计意图，则可以在优化过程中保存OGV Bladerow的性能。流动）。由于加载分布易于免活性型分析，因此可以使用基于本文第I部分中描述的模型的方法来实现最佳OGV图案的产生，以非常合理的计算费用。

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