Non-Linear Aerodynamic simulations as a comprehensive component of aircraft program development

2008年，所有积极参与者签署了一项雅阁，目标是到2020年减少80%的氮氧化物排放和50%的二氧化碳排放。空气动力学的改进，如通过层流控制或新的飞机构型概念所带来的改进，被视为实现这些目标的潜在的（如果不是必要的）技术。 虽然正在进行研究以研究特定技术的影响，但需要在整体飞机设计的背景下进一步开发空气动力学分析，即必须维斯于飞机评估这些新技术的空气动力学影响作为一种交通工具，例如制造影响或认证要求。 该研究计划的目的是开发方法，用于评估整个飞行状态下的空气动力学效应，以进行认证，这超出了起飞/着陆和巡航条件的稳定飞行状态。 重点将放在分析非线性空气动力学模拟的背景下的稳定性和控制的飞机，如失速的开始和发展，和流动的控制表面，如副翼或稳定。 该方法将是两个层次。 第一是增强当前最先进的计算流体动力学（CFD）技术，以包括非定常和非对称空气动力学分析。 第二种方法将基于半经验方法，如经典的非线性升力线方法，但附加信息来自高保真计算流体动力学方法，而不是首次推导时的实验或风洞数据。这一建议的成果将是知识和工具，这些知识和工具将被插入到更大的模拟系统中，帮助飞机设计师、飞行模拟器工程师、认证专家和环保主义者评估关键空气动力学技术对未来航空运输概念的全球影响。

The air transport industry is launching international efforts towards reducing its environmental impact, following the 2008 accord signed by all active players with goals of reducing by 80% NOx and by 50% CO2 emissions by 2020. Aerodynamic improvements, such as those brought through laminar flow control or new aircraft configurations concepts, are being viewed as potential if not necessary technologies to achieve these objectives. Whereas research is being conducted to study the impact of specific technologies, there is a need to further develop aerodynamic analysis in the context of overall aircraft design, i.e. where the aerodynamics effects of these new technologies must be assessed vis-à-vis the aircraft as a vehicle, such as manufacturing effects or certification requirements. This research program aims at developing methodologies for the evaluation of aerodynamic effects in the entire flight regime for certification which goes beyond the steady flight regimes of take-off/landing and cruise conditions. Emphasis will be placed on analysis of non-linear aerodynamic simulations in the context of the stability and control of the aircraft, such as stall onset and progression, and flows over control surfaces such as ailerons or stabilizers. The approach will be two-level. The first is to enhance current state-of-the-art Computational Fluid Dynamics (CFD) techniques to include unsteady and asymmetrical aerodynamic analysis. The second approach will be based on semi-empirical methods such as classical non-linear lifting line methods but with additional information coming from the high-fidelity CFD methods as opposed to experimental or wind-tunnel data when they were first derived. The outcome of this proposal will be knowledge and tools that will be inserted into larger simulation systems that will help aircraft designers, flight simulator engineers, certification experts and environmentalist assess the global outcome of key aerodynamic technologies on future air transport concepts.