Zhangming Zeng , Szu-Fu Huang , William N. Alexander , Anupam Sharma
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引用次数: 0
Abstract
A novel aerodynamic-whistle-based ultrasonic tone generator is proposed that has the potential to serve as a bat deterrent when installed on wind turbine rotor blades. The device uses blade-relative flow to excite resonance in cavities that are geometrically tailored to generate tones at the desired ultrasonic frequencies. A comprehensive experimental and numerical study is presented wherein two such deterrent designs are investigated. Experiments are performed in an anechoic wind tunnel where the deterrents are mounted on a blade section with the NACA 0012 profile. Measurements show that the deterrents produce the desired tonal spectrum when the tunnel flow speed exceeds a threshold value. There is also a maximum flow speed above which the deterrents do not generate tones. Variations with flow speed and blade angle of attack are investigated. Acoustic beamforming is used for source localization with partial success.
The compressible unsteady Reynolds-averaged Navier-Stokes equations are solved with the SST turbulence model to simulate the aeroacoustics of the deterrents. Two-dimensional simulations capture the tonal frequencies and the trends with flow speed and blade angle of attack observed in the experiments. Three-dimensional simulations are performed with span-periodic boundaries for two deterrent configurations – one with one resonator modeled and another with two resonators modeled. The flow unsteadiness is higher in the two-resonator configuration; however, the unsteady pressures in the two resonators are nearly out of phase. The Ffowcs Williams-Hawkings acoustic analogy is used to compute the far-field acoustics. The simulations capture the tonal sound pressure levels at the fundamental frequency and the second harmonic.
期刊介绍：
Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense.
Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems.
Manuscripts that address all fields of applications of acoustics ranging from medicine and NDT to the environment and buildings are welcome.
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