Buzz Saw Noise Propogation in Steady Distorted Intake Flows

噪声是影响民用航空环境的主要因素之一。降低飞机噪音对航空运输的发展和英国飞机工业的未来至关重要。该项目将侧重于预测超音速风扇噪声，俗称为“嗡嗡声”噪声，这是由高涵道比涡轮风扇发动机产生的。这种噪声源在起飞时特别明显。其主要目标是开发新的预测方法，能够模拟涡轮风扇进气道声的非线性传播和辐射，包括其通过非均匀流的传播和管道壁上声学衬里的吸收。这项工作将涉及计算流体动力学和计算航空声学、理论建模和利用罗尔斯·罗伊斯风扇台架试验的实验数据进行验证研究。

Noise is a major environmental impact of civil aviation. Reducing aircraft noise is critical to the growth of air transport and to the future of the UK aircraft industry. This project will focus on the prediction of supersonic fan noise, known colloquially as "buzz-saw" noise, which is generated by high-bypass-ratio turbofan engines. This noise source is particularly apparent at take-off. The key aim will be to develop new prediction methods which can simulate the nonlinear propagation and radiation of sound from turbofan intakes, including its propagation through non-uniform flow and absorption by acoustic lining on the duct walls. The work will involve computational fluid dynamics and computational aeroacoustics, theoretical modelling and validation studies using experimental data from Rolls-Royce fan rig tests.