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Modelling the aerodynamics of propulsive system integration at cruise and high-lift conditions

机译：在巡航和高升空条件下对推进系统集成的空气动力学建模

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摘要

Due to a trend towards Ultra High Bypass Ratio engines the corresponding engine/airframe interference is becoming a key aspect in aircraft design. The present economic situation increases the pressure on commercial aviation companies to reduce the Direct Operating Cost, and the environmental situation requires a new generation of aircraft with a lower environmental impact. Therefore detailed aerodynamic investigations are required to evaluate the real benefits of new technologies.The presented research activity is part of a long-term project with the main objective of generating a reliable and accurate tool to predict the performance of an aircraft over the whole flight domain. In particular the aim of this research was to perform advanced CFD in order to establish a tool able to evaluate engine installation effects for different configurations and attitudes. The developed tool can be provided with correlations of the Net Propulsive Force (NPF), the force exerted by the power-plant to the aircraft, as a function of position. This can be done in principle at cruise, hold, climb, descent, take-off and landing, to model the different integration effects at different phases.Due to the complexity of the problem it was only possible at an initial stage to determine these correlations at cruise condition. Two parametric test cases were evaluated, showing that the engine horizontal positioning can influence the mission fuel burn by up to 6.4%. According to the extensive literature review that has been done, this study can be regarded as the first open literature engine position-NPF parametric study using CFD.Even though no correlations were extracted for other conditions; a deployed high-lift wing configuration was also studied in detail, defining the main aerodynamics effects of the engine integration at high angle of attack. A topological study of the high-lift installation vortices is presented in this work and it can be considered the first in the open literature. It should be pointed out that extensive research is currently underway to correctly evaluate the high-lift aerodynamic using CFD. The Propulsive System Integration (PSI) in high-lift conditions is adding flow features to an already demanding problem, making it a real challenge for the numerical methods.Nevertheless the additional effects of a nacelle chine on the maximum lift were also evaluated.The main outcomes of this PhD research were: a coupled performance modelling tool able to handle the effects of engine-airframe integration as a function of geometry and attitude, and a topological study of the high-lift installation vortices.During the course of the work, this research was successfully suggested as an extra activity for the European NEWAC project (New Aero Engine Core Concepts), and resulted in a new deliverable for that project.
机译：由于超高旁路比发动机的发展趋势，相应的发动机/机身干扰已成为飞机设计中的关键方面。当前的经济形势增加了商用航空公司降低直接运营成本的压力，而环境形势要求新一代飞机对环境的影响较小。因此，需要进行详细的空气动力学研究，以评估新技术的真正益处。所进行的研究活动是长期项目的一部分，其主要目的是生成可靠且准确的工具来预测飞机在整个飞行域内的性能。 。特别地，该研究的目的是执行高级CFD，以便建立能够评估不同配置和姿态的发动机安装效果的工具。可以为开发的工具提供净推进力（NPF）的相关性，净推进力是动力装置施加到飞机的力，它是位置的函数。原则上，这可以在巡航，保持，爬升，下降，起飞和着陆时完成，以对不同阶段的不同整合效果建模。由于问题的复杂性，只能在初始阶段确定这些相关性在巡航条件下。对两个参数测试用例进行了评估，结果表明，发动机的水平位置最多可影响6.4％的燃油消耗。根据已经进行的广泛文献综述，该研究可以被视为第一个使用CFD的开放文献引擎位置-NPF参数研究。还对展开的高升力机翼配置进行了详细研究，确定了高攻角发动机集成的主要空气动力学效果。这项工作提出了对高扬程涡旋的拓扑研究，并且可以认为是公开文献中的第一个。应该指出的是，目前正在进行广泛的研究，以使用CFD正确评估高升空气动力学。高升程条件下的推进系统集成（PSI）正在为已经很苛刻的问题增加流动特性，这对数值方法来说是一个真正的挑战，尽管如此，还评估了机舱脊椎对最大升程的附加影响。这项博士研究的成果是：一个能够处理发动机-机身集成的几何形状和姿态的函数的耦合性能建模工具，以及对高扬程安装涡旋的拓扑研究。研究被成功建议为欧洲NEWAC项目（新航空发动机核心概念）的一项额外活动，并为该项目带来了新成果。

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    Sibilli Thierry;

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  • 年度 2012
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  • 原文格式 PDF
  • 正文语种 {"code":"en","name":"English","id":9}
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