Mode-switching and nonlinear effects in supersonic jet noise
Source abstract
Abstract
The paper employs STFT (Short Time Fourier Transform) to extract and analyze the noise components of a supersonic jet through four rectangular nozzles with different AR (Aspect Ratio) since it can capture and represent the evolution of screech and its harmonics more directly. The results indicate that the screech of jet noise becomes pure and the fundamental frequency increases as the AR is reduced, and the more noticeable dominant interval moves towards lower pressure regions. Various oscillation modes of the shock cells results in the different fundamental frequencies of screech in free jet noise. The results also suggest more complicated components of screech and harmonics in the jet through an AR=2 nozzle. In addition, no multi-frequency relation is found between the fundamental frequency and the harmonics, and a relatively long switching duration of oscillation modes is observed that may cause more complicated interactions between Mach waves, screech, harmonics, and shock cells. The AR1 nozzle is recommended in engineering applications, however, small scale resonance may be initiated due to its high screech frequency and result in structural damage. STFT is the better method in applications for fast identification of the signal components of jet noise.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Aerodynamics and Acoustics in Jet Flows · Acoustic Wave Phenomena Research · Fluid Dynamics and Turbulent Flows
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Mechanical Engineering and the State Key Laboratory for Strength and Vibration of Mechanical Structure, Xi’an Jiaotong University 1 , Xi’an 710049, People’s Republic of China
Aviation Key Laboratory of Science and Technology on Life-support Technology, AVIC Aerospace Life-support Industries, Ltd. 2 , Xiangyang, Hubei 441000, China
Aeronautics and Astronautics Engineering Institute of Air Force Engineering University 3 , Xi’an 710038, China
Funding
National Natural Science Foundation of China
References (44)
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