2018/5/16 Empirical Noise Methods-ESDU 图上唐大学 Typical Noise Levels 国上清大学 Engine noise [ESDU02020] -Jet noise -Fan and compressor noise -Turbine noise -Core noise,including combustion noise -Propeller noise 60 Airframe noise[ESDU90023] Undercarriageo吵y Wing only -Wings -Landing gear (main and nose) -Horizontal tail -Vertical tail 40 Flaps Cabin noise-structure fatigue [ESDU02020] 6125250500100020004008000 Frequency (Hz) Computational Aeroacoustics 圈上活大坐 Computational Aeroacoustics 圈上活大整 Closely related to CFD,but there are significant differences Overall framework Basic elements Analytic RANS+SNGR URANSDES LES DNS oae Acoustic Sources Euler (non-in) URANS LEE-ORP Buffen'soonge zone Kcf元8 URANS+SNGR LEE-comoact Grid strelching E LES LEE-DGM PML LEE-polantia DNS DtN+other NRBC LES FW-H equation Kirchhotsra8E☐ DNS Ref CAA notes.pdf Ref:CAA notes.pdf Experimental Aeroacoustics 圆上清文大警 Some Typical Noise Reduction Technologies (1) 国上洋大学 。 Noise test is a challenge Flap Side Edge Noise data:Use of m 。 Validation to CAA models Certification requirements Noise reduction research GIn DNW-LLE ource:NASA rslty-Dr.V(enbin Song 52018/5/16 5 © Shanghai Jiao Tong University – Dr. Wenbin Song School of Aeronautics and Astronautics Empirical Noise Methods - ESDU • Engine noise [ESDU02020] – Jet noise – Fan and compressor noise – Turbine noise – Core noise, including combustion noise – Propeller noise • Airframe noise[ESDU90023] – Wings – Landing gear (main and nose) – Horizontal tail – Vertical tail – Flaps • Cabin noise – structure fatigue [ESDU02020] © Shanghai Jiao Tong University – Dr. Wenbin Song School of Aeronautics and Astronautics Typical Noise Levels © Shanghai Jiao Tong University – Dr. Wenbin Song School of Aeronautics and Astronautics Computational Aeroacoustics • Closely related to CFD, but there are significant differences • Basic elements Ref: CAA notes.pdf © Shanghai Jiao Tong University – Dr. Wenbin Song School of Aeronautics and Astronautics Computational Aeroacoustics • Overall framework Ref: CAA notes.pdf © Shanghai Jiao Tong University – Dr. Wenbin Song School of Aeronautics and Astronautics Experimental Aeroacoustics • Noise test is a challenge – Test facilities: closed/open sections with anechoic facilities (消声室) – Measurement and processing of noise data: Use of microphone arrays – Scale effect difficult to model, real size model tests are necessary for LG, HLD • Validation to CAA models • Certification requirements • Noise reduction research © Shanghai Jiao Tong University – Dr. Wenbin Song School of Aeronautics and Astronautics Some Typical Noise Reduction Technologies (1) • Flap Side Edge Noise