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A fire extinguisher that uses pressurized water relies on fluid dynamics principles to generate a high-velocity stream capable of suppressing flames. The water is stored at a much higher pressure inside the extinguisher than the surrounding atmosphere. This pressure difference forces the water to flow rapidly when the extinguisher is activated, and the behavior of the water as it exits the nozzle can be understood using fundamental equations of fluid dynamics.
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Optimum Efficiency of a Steam Ejector for Fire Suppression Based on the Variable Mixing Section Diameter.

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  • 1School of Mechanical and Electrical Engineering, Suqian University, Suqian 223800, China.

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Summary

Steam ejectors enhance fire suppression by optimizing fluid mixing and steam droplet generation, reducing water usage. This study found that adjusting the diffuser throat diameter significantly impacts entrainment ratio and pumping efficiency.

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Area of Science:

  • Engineering
  • Fire Safety Technology

Background:

  • Steam ejectors are crucial for fire suppression due to their fluid-carrying and mixing capabilities.
  • The steam droplet strategy offers efficient fire extinguishment with reduced water consumption.

Purpose of the Study:

  • To investigate the effect of varying mixing section diameters on steam ejector pumping performance.
  • To analyze how ejector geometry influences fire suppression efficiency.

Main Methods:

  • Experimental analysis of steam ejector performance.
  • Systematic variation of diffuser throat diameter and primary fluid pressure.
  • Evaluation of entrainment ratio and critical back pressure under different operating conditions.

Main Results:

  • Increasing the diffuser throat diameter by 4 mm significantly enhanced the entrainment ratio and pumping efficiency.
  • The critical back pressure of the ejector decreased with increased throat diameter.
  • The entrainment ratio initially rose with primary fluid pressure, then diminished, reaching a maximum of 0.5 at 0.36 MPa.

Conclusions:

  • Ejector geometry, particularly the mixing section diameter, critically influences performance.
  • An optimal constant diameter can maximize ejector pumping efficiency under specific conditions.
  • Balancing exhaust efficiency and capacity is essential for practical steam ejector design in fire suppression.