The Effect of the Convergent Nozzle Fan on Air Pressure

Authors

  • X.A. Nurxonov Associate Professor, Department of Geology and Mining, Karshi State Technical University
  • A.A. Ravshanov Master of Production Education, Training-Course Combine, Southern Mining Department (“NKMK” JSC)
  • F.K. Khudaykulov Head of the Southern Department, Department of Labor Protection and Technical Safety (“NKMK” JSC)
  • U.A. Hamidov Emergency Situations Engineer, “Zarmitan” Mine, Southern Mining Department (“NKMK” JSC)
  • F.M. Bo‘riyev Senior Master of Production Education, Training-Course Combine, Southern Mining Department (“NKMK” JSC)

Keywords:

Convergent nozzle, confusor fan, air pressure, airflow rate, outlet resistance, aerodynamic efficiency, pressure–flow characteristics, contraction resistance, diffuser effect, ventilation systems.

Abstract

This paper discusses the influence of a convergent nozzle (confusor) on the pressure and flow characteristics of axial fans. It explains how the addition of a convergent nozzle increases the air velocity and enhances the ejection effect while partially reducing the fan’s overall capacity and static pressure. The study presents mathematical relationships describing pressure drop, outlet resistance, and total aerodynamic resistance, highlighting the role of geometric parameters such as the nozzle’s contraction angle and cross-sectional area ratio. The pressure–flow (ΔP–Q) characteristics of fans with and without a convergent nozzle are compared to demonstrate performance differences. The results show that, despite a slight reduction in airflow, the use of a convergent nozzle can significantly improve energy efficiency and flow stabilization when appropriately designed.

References

1.Ambareen Khan, Abdul Aabid, S. A. Khan. CFD analysis of convergent‑divergent nozzle flow and base pressure control using micro‑JETS.

2.Chetan Kumar Sain & Klaus Hoeschler. Aerodynamic assessment of nozzle area variation by core fairing modulation.

3.V. L. Zimont & S. V. Yagudin. Choking of ideal‑gas flow in convergent nozzles and integral nozzle characteristics.

4.Lingling Chen, Yongqiang Shi, Haoqi Yang, Yalin Shi & Qingzhen Yang. Detailed investigation of supersonic film cooling performance in a convergent divergent nozzle.

5.“On the Performance of Variable‑Geometry Ducted E‑Fans” (ASME, 2024). On the Performance of Variable‑Geometry Ducted E‑Fans.

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Published

2025-10-18

Issue

Section

Articles

How to Cite

The Effect of the Convergent Nozzle Fan on Air Pressure. (2025). International Journal of Scientific Trends, 4(10), 113-116. https://scientifictrends.org/index.php/ijst/article/view/649