CAMBRIDGE UGTP WHOLE ENGINE COMPUTATIONAL AEROACOUSTICS CONSORTIUM

预计到2020年，全球飞机机队对航空运输的需求将增加一倍，因此采取措施减少飞机起飞噪音对环境的影响变得迫在眉睫。在最坏的情况下，噪音可能不仅仅是烦人，还可能是导致高血压等疾病的一个因素。因此，欧洲航空研究咨询委员会（ACRE）设定了到2020年将感知噪音水平降低50%的目标。一个关键的噪声源是由与航空航天流动相关的高雷诺数下产生的强大湍流流场引起的。因此，声学专家必须能够准确地预测湍流流场及其与燃烧的相互作用，然后对其进行处理以减小声学特征。唯一可靠地预测湍流的方法是直接或近直接地模拟纳维-斯托克斯方程。在实际雷诺数下，这需要大量的计算资源。因此，HECToR资源被用于研究各种航空发动机流程/系统，以产生降噪。考虑的区域包括发动机入口转子/风扇区域，燃烧室，涡轮和排气。

With the projected demand for air transport set to double the world aircraft fleet by 2020 it is becoming urgent to take steps to reduce the environmental impact of take off noise from aircraft. In worst case noise can be more than just annoying, potentially being a contributory factor towards illnesses such as hypertension. Hence, the Advisory Council for Aeronautics Research in Europe (ACRE) has set the target of reducing perceived noise levels by 50% by the 2020. A key noise source is caused by the powerfully turbulent flow field generated at the high Reynolds numbers associated with aerospace flows. Hence, the acoustician must be able to accurately predict the turbulent flow field, and its interaction, where necessary with combustion, and then manipulate it to reduce the acoustic signature. The only means of reliably predicting turbulence is through direct or near direct simulation of the Navier-Stokes equations. This, at realistic Reynolds numbers needs massive computational resources. Hence, access to the HECToR resource is sought to study various aeroengine flows/systems to produce noise reductions. The areas considered include the engine inlet rotor/fan zones, the combustor, turbine and exhaust.