Experimental Study of Flow Characteristics of Mobile Fans under Real Operating Conditions (Case Study)
Aim: The aim of this article is to evaluate the effect of selected positioning parameters of the fan (positioning distance and impeller angle) on the ability to pump a volumetric airflow stream through a construction object. Project and methods: Mobilne wentylatory wykorzystywane podczas działań rat...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Scientific and Research Centre for Fire Protection - National Research Institute
2022-12-01
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| Series: | Safety & Fire Technology |
| Subjects: | |
| Online Access: | https://sft.cnbop.pl/pdf/SFT-Vol.-60-Issue-2-2022-pp.-104-117.pdf |
| Summary: | Aim: The aim of this article is to evaluate the effect of selected positioning parameters of the fan (positioning distance and impeller angle) on the ability
to pump a volumetric airflow stream through a construction object.
Project and methods: Mobilne wentylatory wykorzystywane podczas działań ratowniczych stanowią ważne narzędzie pozwalające ograniczyć rozprzestrzenianie
się dymu podczas pożarów wewnętrznych obiektów budowlanych. Z uwagi na charakter wykorzystania tych urządzeń, cechy warunkujące
ich skuteczność działania powinny być poddane badaniom z wykorzystaniem metodyk badawczych o charakterystyce zbliżonej do ich rzeczywistych
warunków stosowania. W artykule przedstawiono autorską metodę badań objętościowego strumienia przepływu powietrza. Ponadto zaprezentowane zostało stanowisko badawcze FRC (ang. flow resisting curtain) przeznaczone do wyznaczania charakterystyk przepływowych w rzeczywistych układach
obiektów budowlanych. Badania przepływowe wykonano na terenie obiektu o kubaturze 282 m3 stanowiącego salę szkoleniową Centrum Naukowo-
-Badawczego Ochrony Przeciwpożarowej – Państwowego Instytutu Badawczego.
Methodology: Mobile fans used during rescue operations are an important tool to reduce the spread of smoke during interior fires in buildings. Due to
the nature of the use of these devices, the characteristics that determine their performance should be tested using test methodologies with characteristics
similar to their actual conditions of use. The article presents the author's method for studying the volumetric flow rate of air. In addition, a flow resisting
curtain (FRC) test stand for determining flow characteristics in real building systems was presented. The flow tests were carried out at a facility with
a volume of 282 m3, which is a training room of the Scientific and Research Centre for Fire Protection – National Research Institute.
Results: As part of the performed research, the flow characteristics for the mobile fan sample were determined. The completed tests showed that the
fan pumped a volumetric flow rate ranging from 2471 to 17997 m3/h. It was determined that the most favourable positioning distance of the tested fan
calculated from the inlet opening to the room is 5 meters. At this distance, the highest values of volumetric flow rate were obtained for both studied slope
angles – 0 and 8° (recorded values are 17298 and 17997 m3/h, respectively).
Conclusions: Proper positioning of the mobile fan has a significant impact on the amount of airflow pumped through the building. The positioning
parameters of the mobile unit are, respectively, the mechanism for changing the angle of the air supply and its mobility – the ability to move to another
location. This article presents the results of a test of the volumetric flow characteristics of an air jet generated by a mobile fan. The test results showed
that the parameters of fan positioning have a significant impact on the effectiveness of tactical mechanical ventilation during rescue operations. Observations
made during the tests indicate that it is reasonable to implement requirements for the mandatory use of information boards showing the optimal
positioning parameters for mobile units to achieve the highest possible expenditure.
Keywords: Positive Pressure Ventilator (PPV), mobile fan, full scale experiment, open flow, air flow rate |
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| ISSN: | 2657-8808 2658-0810 |