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首页> 外文会议>1998 National Academy of Engineering Fourth Annual Symposium on Frontiers of Engineering, September 17-19, 1998 >Role of simulation in the design of next-generation engines for military aircraft
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Role of simulation in the design of next-generation engines for military aircraft

机译：模拟在军用飞机下一代发动机设计中的作用

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To stimulate and enable the emergence of new concepts for affordable advanced flight vehicles and propulsion systems, fast, adequate, and affordable models are necessary to support computational fluid dynamics (CFD)-based design in realistic complex flows. Complex turbomachinary flows, such as those used in current and future military aircraft engines, exhibit unsteady aerodynamics, forced blade response and high-cycle fatigue, complex confluent interacting flows with strong rotation, compressor surge and stall instabilities, and losses and extremely high temperatures in both the combustor and turbine components. In addition to the complexity of the systems themselves, the flows exiting these propulsion systems are complex three-dimensional shear flows characterized by large temperature, velocity, and density fluctuations. Such exit flows can be detrimental to other components of the aircraft such as control surfaces like flaps because of extremely high heat loading. They also impact the acoustic and thermal signatures of the flight vehicle. In this paper, a brief overview of current uses of CFD methods will be presented and elucidated by example. We will begin at the compressor, skip the combustor for now (we will discuss an exciting very recent development for simulating combustor flows later), move to the turbine, and finally discuss applications to exit flows. Problem areas as well as successes will be noted and future directions discussed.
机译：为了刺激并实现可负担得起的先进飞行器和推进系统的新概念的出现，必须有快速，适当和可负担得起的模型来支持现实复杂流中基于计算流体动力学（CFD）的设计。复杂的涡轮机流，例如当前和将来的军用飞机发动机中使用的流，表现出不稳定的空气动力学，强制叶片响应和高循环疲劳，复杂的合流相互作用流，强烈的旋转，压缩机喘振和失速失稳以及损失和极高的温度。燃烧室和涡轮组件。除了系统本身的复杂性之外，离开这些推进系统的流是复杂的三维剪切流，其特征是温度，速度和密度波动较大。由于极高的热负荷，这种出口流可能不利于飞机的其他部件，例如襟翼等控制表面。它们还会影响飞行器的声学和热信号。在本文中，将简要介绍CFD方法的当前用途，并通过示例进行说明。我们将从压缩机开始，现在跳过燃烧器（我们将在稍后讨论燃烧器流量的激动人心的最新进展），移至涡轮机，最后讨论退出流量的应用。将指出问题领域以及成功之处，并讨论未来的方向。

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