Aerodynamic shape optimization framework for engine installation in an unconventional airframe

用于非常规机身中发动机安装的空气动力学形状优化框架

• 批准号: RGPIN-2022-03586
• 负责人: Germain, Patrick
• 金额: $ 2.04万
• 依托单位: École de technologie supérieure
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=754441
• 关键词: Aerodynamic; shape; optimization; framework; engine

The major challenge for the transport aircraft industry in the next 20-30 years is the reduction of its carbon dioxide emissions in operation. The development of technologies to increase the energy efficiency of the aircraft must continue in parallel with the efforts to switch the source of energy from fossil fuel to a carbon-free source, such as hydrogen or electricity. The contribution to the jump in efficiency from the change of aircraft configuration alone could be large, up to 30% in the case of the blended-wing body (BWB) through drag reduction. Such revolutionary development however represents an important financial and technological risk, until its associated technology roadblocks are removed. One of these roadblocks is that even though modern engines also improve from generation to generation, their operability and high efficiency remain susceptible to the quality of the flow at the face of the engine or the fan. As the fan blades rotate through successive pockets of changing flow properties, too much spatial gradients from pocket to pocket can lead to issues of stability and structural integrity for the engines. This problem is exacerbated by unconventional configurations, such as the flying wing or the BWB, particularly when the engines are integrated (buried) in the airframe. It is thus important to elevate the maturity of these unconventional configurations to reduce the technological risk. If the flow behavior is not examined early in the design phase and sufficiently stabilized, there is the high risk that the aircraft configuration becomes impractical and that the efficiency gain above is neither protected nor realized. It is proposed to elaborate aircraft configurations with highly integrated propulsion systems beyond the conceptual level, achieving low drag (high efficiency) and taking advantage of passive flow control to maintain adequate flow uniformity at the engine(s) with demanding spatial requirements. With examples of unconventional configurations in the available literature, it is proposed to review, explore and determine aerodynamic shapes for their inlet (S-duct) and the portions of their external surfaces that are affected by the installation of the engine(s), such that these will operate satisfactorily at any flight conditions, thereby removing the technological roadblock associated with propulsion/airframe integration (PAI). Multiple constraints that are representative of the realistic aircraft operating envelope will be considered. A virtual aerodynamics laboratory or test bed will be created through the construction of a design framework for automatic shape optimization. For example, the impact of aero-shaping of the airframe and the inlet will be quantified. The efficiency of a powerplant installed in nacelles on pylon will be compared accurately with that embedded in the airframe.

未来20 - 30年内，运输飞机行业的主要挑战是减少其运营二氧化碳的排放。提高飞机能源效率的技术的发展必须与将能源从化石燃料转换为无碳源的努力（例如氢或电力）的努力。仅飞机配置的变化可能会大大提高效率的贡献，在混合翼主体（BWB）的情况下，通过减少拖动最高30％。然而，这种革命发展代表了重要的财务和技术风险，直到消除其相关的技术障碍为止。这些障碍之一是，即使现代发动机也一代也有所改善，但它们的可操作性和高效率仍然容易受到发动机或风扇的流量质量。随着风扇叶片在不断变化的流动性能的连续口袋中旋转，从口袋到口袋的空间梯度过多会导致发动机的稳定性和结构完整性问题。非常规配置（例如飞行翼或BWB）加剧了这个问题，尤其是当发动机在机身中集成（埋藏）时。因此，重要的是提高这些非常规配置的成熟度以降低技术风险。如果未在设计阶段早期检查流动行为，并且足够稳定，则飞机配置变得不切实际，并且效率增长既不保护也没有实现。提议使用高度集成的推进系统来详细介​​绍超出概念水平的高度集成的推进系统，从而达到低阻力（高效率），并利用被动流量控制，以保持发动机在发动机（S）的适当流动均匀性，并具有苛刻的空间要求。借助可用文献中非常规配置的示例，提议审查，探索和确定其入口（S导管）的空气动力学形状及其外部表面的一部分，其外部表面的一部分会受到发动机安装的影响（S），以使这些飞行条件在任何飞行条件下都可以拆卸，从而与prop-apir propivion propirip profions cop air clandion propiription profions firpirip air firmiation firmiation firpirip。将考虑代表现实飞机操作信封的多个约束。通过构建设计框架以进行自动形状优化，将创建虚拟空气动力学实验室或测试床。例如，将量化机身和入口的空气形状的影响。将在塔架上安装在塔架上的动力装置的效率将与机身嵌入的速度准确比较。