Numerical Study of the Effect of Sprinkler Structure during Water Discharge in Dry Fire Fighting System

Document Type : Original Article

Authors
Saeed Vahidifar 1
Sadegh Farahi 2
1 Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran
2 DEPARTMENT OF MECHANICAL ENGINEERING, KHAYYAM UNIVERSITY,MASHHAD
10.22034/stme.2023.376178.1024
Abstract
In the fire extinguishing system of large buildings in the winter season, preventing of the water from freezing inside the sprinkler system is an important issue. For this purpose, the dry pipe sprinkler system is being used. In this method, instead of water, there is air inside the system, and during a fire, a pressure drop is created when the sprinkler bulb bursts, and water is injected into the pipes by using the firefighting pumping system, and it must reach the most remote sprinkler in the minimum time. In this numerical study, by using of Ansys Fluent software, and changing the sprinkler structure and the water outlet nozzle with different angles, the duration of water discharge is investigated. The results show that adding the convergence angle of the nozzle of the sprinkler’s outlet has increased the velocity of the air flow at the outlet of the nozzle, which has reduced the time for water to reach the the most remote sprinkler 0f the system is also reduced.
Keywords
Dry Pipe Sprinkler
Convergent-Divergent Nozzle
Convergence-Divergence Angle
Supersonic
Flow
Subjects
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  • Receive Date 10 December 2022
  • Revise Date 20 July 2023
  • Accept Date 26 August 2023
  • First Publish Date 26 August 2023
  • Publish Date 22 June 2023