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Related Concept Videos

Free Jet01:14

Free Jet

Free jets describe the flow of liquid exiting a reservoir through an opening into the atmosphere without resistance. The velocity (v) of the liquid jet is derived using Bernoulli's principle and expressed as:
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Bernoulli's Equation

In the middle of the nineteenth century, it was observed that two trains passing each other at a high relative speed get pulled towards each other. The same occurs when two cars pass each other at a high relative speed. The reason is that the fluid pressure drops in the region where the fluid speeds up. As the air between the trains or the cars increases in speed, its pressure reduces. The pressure on the outer parts of the vehicles is still the atmospheric pressure, while the resultant...
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Cryogenic Liquid Jets for High Repetition Rate Discovery Science
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A multi-mode screech frequency prediction formula for circular supersonic jets.

J H Gao1, X D Li

  • 1School of Jet Propulsion, Beihang University, Beijing 100191, People's Republic of China.

The Journal of the Acoustical Society of America
|March 25, 2010
PubMed
Summary

This study reveals how instability waves, shock cells, and screech tones interact in jets. A new formula predicts screech tone frequencies based on wave interactions within shock cells.

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Area of Science:

  • Acoustics
  • Fluid Dynamics
  • Computational Physics

Background:

  • Jets generate complex acoustic phenomena, including screech tones.
  • Understanding the interaction between instability waves and shock cells is crucial for predicting jet noise.
  • Previous numerical simulations provide a foundation for this time evolution analysis.

Purpose of the Study:

  • To analyze the time evolution of interactions between instability waves, shock cells, and screech tones.
  • To identify the mechanism of upstream feedback in the screech loop.
  • To develop a prediction formula for screech tone frequencies.

Main Methods:

  • Time evolution analysis of numerical simulation data.
  • Phase variation analysis of dominant pressure fluctuations.
  • Identification of effective sound source regions based on shock cell count.

Main Results:

  • Identified an attachment and reinforcement process as part of the screech loop.
  • Determined the effective sound source region to be the first five shock cells.
  • Found a relationship between wave counts and screech modes (5 for A1, B, D; 6 for A2, C).

Conclusions:

  • Proposed a screech tone frequency prediction formula based on the identified wave-shock cell relationship.
  • The formula shows good agreement with experimental data for various jet conditions.
  • Classified previously observed A0 modes into the proposed A1 and A2 modes.