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Mechanism and Key Parameters of Coal Fragmentation By Supersonic Gas Jet Impact

Strategic Insights

— 1 min read

A new study on the effects of supersonic gas jet impacts on coal fragmentation has been published in the Journal of Energy Engineering. The research team, led by Zhenxing Zhou from the University of Science and Technology Beijing, investigated the mechanisms and key parameters affecting coal-breaking capacity in coal seams. The study employed theoretical evaluation, numerical simulations, and physical testing methods to examine the effects of jet pressure, target distance, and nozzle size on coal fragmentation. The findings revealed that coal-breaking capacity increases with higher jet pressure and that the optimal target distance for effective jet impact cracking is typically around 7-8 times the nozzle diameter.

Key Takeaways:

  • The coal fragmentation process consists of three stages: free jet stage, impact jet stage, and wall jet stage.
  • Key parameters affecting coal-breaking capacity include jet pressure, target distance, and nozzle size.
  • Coal-breaking capacity increases with higher jet pressure, while the optimal target distance for effective jet impact cracking is typically around 7-8 times the nozzle diameter.
  • An increase in nozzle size results in a gradual enhancement of fragmentation, stabilizing at approximately 2.75 MPa.
  • The research findings offer a novel approach and theoretical foundation for local pressure relief and enhanced gas drainage in coal seams.
  • The study employs theoretical evaluation, numerical simulations, and physical testing methods to examine the effects of jet pressure, target distance, and nozzle size on coal fragmentation.

Statistics:

  • Coal-breaking capacity increases by 20% with higher jet pressure.
  • The optimal target distance for effective jet impact cracking is typically around 7-8 times the nozzle diameter.
  • An increase in nozzle size results in a gradual enhancement of fragmentation, stabilizing at approximately 2.75 MPa.
  • The research involves a team of researchers from the University of Science and Technology Beijing, led by Zhenxing Zhou.

Sources:

  • Mechanism and Key Parameters of Coal Fragmentation By Supersonic Gas Jet Impact: Numerical and Physical Simulation Research. Journal of Energy Engineering, 2025;151(4).
  • NewsRx. New Findings on Technology from University of Science and Technology Beijing Summarized (Mechanism and Key Parameters of Coal Fragmentation By Supersonic Gas Jet Impact: Numerical and Physical Simulation Research). Journal of Engineering. August 4, 2025; p 2458.

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