Numerical Assessment of Acoustic Installation Effects Characterizing NASA/LaRC Quiet Flow Facility using Computational AeroAcoustics
نویسندگان
چکیده
منابع مشابه
Numerical investigation of the refraction effects by jet flows in anechoic wind tunnels
In regard to the problem of aircraft noise mitigation, the present study focuses on the refraction effects to be possibly induced by anechoic facility jet flows on the measured acoustic signatures, during typical airframe noise experiments. To this end, Computational AeroAcoustics (CAA) calculations based on the solving of the Perturbed Euler Equations (PEE) are conducted, enabling the estimati...
متن کاملA Model for Shear Layer Effects on Engine Noise Radiation
Prediction of aircraft engine noise is an important aspect of addressing the issues of community noise and cabin noise control. The development of physics based methodologies for performing such predictions has been a focus of Computational Aeroacoustics (CAA). A recent example of code development in this area is the ducted fan noise propagation and radiation code CDUCT-LaRC. Included within th...
متن کاملAeroacoustics of Propulsion Airframe Integration: Overview of NASA’s Research
The integration of propulsion and airframe is fundamental to the design of an aircraft system. Many considerations influence the integration, such as structural, aerodynamic, and maintenance factors. In regard to the acoustics of an aircraft, the integration can have significant effects on the net radiated noise. Whether an engine is mounted above a wing or below can have a significant effect o...
متن کاملAn Overview of Computational Aeroacoustic Modeling at Nasa Langley
The use of computational techniques in the area of acoustics is known as computational aeroacoustics and has shown great promise in recent years. Although an ultimate goal is to use computational simulations as a virtual wind tunnel, the problem is so complex that blind applications of traditional algorithms are typically unable to produce acceptable results. The phenomena of interest are inher...
متن کاملInvestigation of Interpolation Strategies for Hybrid Schemes in Computational Aeroacoustics
One key challenge in the numerical simulation of aeroacoustic fields is the huge disparity of scales between flow structures and audible acoustic wavelengths. A volume discretization, resolving both scales from the generating vortex to the desired microphone position, not only leads to a very high number of cells but also to a very small time step size in order to minimize dissipation of the ac...
متن کامل