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jet noise
The discrete component in the jet noise spectrum has been studied in [1-7].
      
The results of an experimental study of the effects of different nozzle heads on turbulent jet noise are analyzed.
      
The acoustic properties of supersonic jet noise from a convergent-divergent nozzle with a baffle have been studied experimentally over the range of nozzle pressure ratios from 2.0 to 8.0.
      
The effect of reflector with sound-absorbing material on supersonic jet noise
      
This paper describes an experimental work to investigate the effect of a reflector on supersonic jet noise radiated from a convergent-divergent nozzle with a design Mach number 2.0.
      
The results obtained show that the acoustic characteristics of supersonic jet noise are strongly dependent upon the jet pressure ratio and the reflector size.
      
Measurement of supersonic jet noise with optical wave microphone system
      
Next, feasibility of this device to measure jet noise was examined.
      
It was found that the optical wave microphone system could measure the jet noise as well as a sound from speaker.
      
It is shown that these slots markedly influence the jet mixing and substantially decrease the jet noise generated in a wide frequency range.
      
In jet noise theory, Lighthill was able to obtain significant and useful qualitative results from the acoustic analogy.
      
The acoustic analogy has influenced the theoretical and experimental research on jet noise since the early 1950s.
      
This paper offers a new rational approach to jet noise suppression methodology.
      
Jet noise research was initiated by Sir James Lighthill in 1952.
      
Since that time, the development of jet noise theory has followed a very tortuous path.
      
This is, perhaps, not surprising for the understanding of jet noise is inherently tied to the understanding of turbulence in jet flows.
      
As a result, the primary focus of jet noise research was to quantify the noise from fine-scale turbulence.
      
Precision instrumentation and facilities for jet noise measurements became available in the mid-eighties.
      
This permitted a large bank of high-quality narrow band jet noise data to be gathered over the subsequent years.
      
Recent analysis of these data has provided irrefutable evidence that jet noise, in fact, is made up of two basic components; one from the large turbulence structures/instability waves, the other from the fine-scale turbulence.
      
 

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