Analysis of Fire Water Monitor Jet Reaction Forces and Their Influences on the Roll Stabilities of Urban Firefighting Vehicle

Sun, Jingjing; Li, Wei; He, Min

doi:10.1007/s10694-019-00879-9

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…The influence of discharge flow and pressure [20], air resistance [21] and mean vector-velocity fields [22] on performance of water monitor systems have been evaluated. Also, several other studies have investigated the non-linear dynamics of the jet sprays from water monitors [23][24][25][26][27]. However, there is a need for characterizing the water distribution patterns from water monitor sprays to aid the development of computational models of fire suppression.…”

Section: Fire Technology 2022mentioning

confidence: 99%

Impact of Firefighting Sprays on the Fire Performance of Structural Steel Members

et al. 2022

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The feasibility of coupled computational fluid dynamics (CFD) and finite element (FE) simulations to aid the planning of fire intervention tactics and the effectiveness of structural cooling during firefighting were investigated. Water sprays, generated using fire monitors, were characterized using bucket tests and the results were used for calibrating the CFD spray model. The cooling ability of the sprays was measured experimentally by applying them onto a fire exposed steel beam. The experimental results showed that water application produces a sudden drop in steel temperatures and after 10–15 s, no significant further reduction in temperature was observed. The CFD-FE coupling was performed using the adiabatic surface temperature method, extended here to include the cooling by water droplets. The coupled CFD-FE model was validated using the experimental data and applied to simulate the intervention to a developing warehouse fire, showing how an attempt to cool the structure reduces the temperatures but does not stall the fire-spread. In fact, the intervention -induced vapor generation was found to enhance the flow of hot gases and accelerate the fire-spread if the water resources are inadequate. Thermal and stress analyses of the cooled and uncooled truss beams were performed, showing how the spray cooling halted the truss mid-span deformation.

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Section: Fire Technology 2022mentioning

confidence: 99%

Impact of Firefighting Sprays on the Fire Performance of Structural Steel Members

et al. 2022

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“…In France, three standards [?, ?, ?, ?, ?, ?, ?, ?, 2,3] Despite the fact that these nozzles are common tools for firefighters, few scientific studies have been performed to assess the efficiency of these extinction devices. To the best of our knowledge, the most recent studies on fire hose nozzle mainly concern the evaluation of the "backward reaction", as treated by Vera et al [5,6], Chin et al [7] or Sun et al [8]. However, no particular literature is devoted to the thermal efficiency of hose nozzles for firefighting operations.…”

Section: Introductionmentioning

confidence: 99%

Quantification of radiative attenuation provided by fire hose nozzles

Suzanne

Testa

Doelsch³

et al. 2022

Fire and Materials

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The aim of this study was to investigate the radiative protection provided by various fire hose nozzles used by several Fire Rescue Services in France and to propose an experimental set-up to quantify it. This study combined the use of radiative sources (a radiant panel or a fire inside a standard shipping container) and metrological devices (radiative heat sensors, IR camera and spectrometer) to estimate the radiative attenuation of water sprays used to protect the firefighters against thermal effects which occur during a fire. For all the fire hose nozzles tested in this work, the maximal effective attenuation reaches 75%. For most of them, an increase of the flow rate improves the radiative attenuation. However, this study shows that a similar attenuation can be reached for different flow rates, suggesting that the droplet size diameter and the droplet volume fraction also play a significant role in the efficiency of the provided spray.

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“…The results showed that when the fire monitor works under high pressure, the influence on the static rollover angle of the vehicle can reach 15.8 • . By establishing a virtual prototype model, Sun et al [20] analyzed the influence of jet reaction force on the lateral stability of urban main fire trucks. The results showed that when the water flow velocity of the fire monitor is 30 L/s to 120 L/s, the rollover angle of the fire engine ranges from 30.9 • to 20.57 • .…”

Section: Introductionmentioning

confidence: 99%

“…These models are not accurate enough for the water tower fire truck. Although the literature [1], [20] has studied the effects of the reaction force on the vehicle, they have not realized the control of the vehicle attitude. Therefore, in order to improve the stability of the high-pressure jet fire truck, it is necessary to study a new vehicle dynamics model and algorithm.…”

Section: Introductionmentioning

confidence: 99%

Integrated Control of Spray System and Active Suspension Systems Based on Model-Assisted Active Disturbance Rejection Control Algorithm

et al. 2022

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Due to the lack of body stability of emergency rescue vehicles, their attitude stability is insufficient and they are unable to realize working while driving, resulting in low rescue efficiency. Aiming at the water tower fire truck, which is equipped with an active suspension system, the vehicle attitude stability is studied. First, combined with the active suspension system and spray system, a 13-DOF integrated dynamic model for the water tower fire truck is established. Using the model-assisted active disturbance rejection control method, the controllers are designed for the vertical displacement, pitch angle, and roll angle of the vehicle attitude. Then, the computer simulation is carried out to verify the effectiveness of this control method. Finally, the water spray obstacle crossing experiment is carried out with a JP32G water tower fire truck. The results show that when the vehicle runs over the triangular obstacle on one side and two sides in the integrated spray-active suspension mode, the peak–peak values of body pitch angle and roll angle are reduced by 10.9% and 23.2%, and 23.7% and 16.3%, respectively, compared with the passive hydro pneumatic suspension.

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Analysis of Fire Water Monitor Jet Reaction Forces and Their Influences on the Roll Stabilities of Urban Firefighting Vehicle

Cited by 6 publications

References 17 publications

Impact of Firefighting Sprays on the Fire Performance of Structural Steel Members

Impact of Firefighting Sprays on the Fire Performance of Structural Steel Members

Quantification of radiative attenuation provided by fire hose nozzles

Integrated Control of Spray System and Active Suspension Systems Based on Model-Assisted Active Disturbance Rejection Control Algorithm

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