Simulation on Flow Rate Characteristics of Gas Fire Extinguishing Agent with Expansion Nozzle Based on AMESim

Xing, Enhao; Jin, Jiaming; Zhang, Zhaojun; Pan, Renming; Li, Qunwei; Zheng, J B

doi:10.1049/cp.2018.0262

CSAA/IET International Conference on Aircraft Utility Systems (AUS 2018) 2018

DOI: 10.1049/cp.2018.0262

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Simulation on Flow Rate Characteristics of Gas Fire Extinguishing Agent with Expansion Nozzle Based on AMESim

Enhao Xing¹,

Jiaming Jin²,

Zhaojun Zhang³

et al.

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2022

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Simulation Study on Aircraft Fire Extinguishing Pipeline with Different Filling Conditions and Pipeline Characteristics

Liu

Yuan

et al. 2022

Fire

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The filling conditions and pipeline characteristics of the aircraft fire extinguishing system determine the pressure of the fire extinguishing cylinder outlet, the discharge quality of the extinguishing agent, and the flow distribution during the discharge process. The simulation model of the fire extinguishing system pipeline of an aircraft was established by Amesim. The influence of filling conditions and pipeline characteristics was studied. It was found that the mass curves of the fire extinguishing agent were similar under filling pressures of 4, 5, and 6 MPa with a filling amount of 5.55 kg. The lower the initial temperature is, the pressure at the outlet of the cylinder decreases, but the emptying time is similar to 1.22 s. The lower the roughness is, the faster the discharge is. Under the ideal smooth pipe (ε = 0 mm), the emptying time of the fire extinguishing cylinder is 0.72 s. When the diameter of the short branch pipe is 10 mm, and the diameter of the long branch pipe is 14 mm, the discharge quality of the two pipes is close. The larger the diameter of the main pipe, the higher the discharge rate. The research results have a certain guiding significance for the pipeline design of certain aircraft.

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Simulation Study on Aircraft Fire Extinguishing Pipeline with Different Filling Conditions and Pipeline Characteristics

Liu

Yuan

et al. 2022

Fire

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Simulation of Fire Extinguishing Agent Transport and Dispersion in Aircraft Engine Nacelle

Liu

Shi

Zhou

et al. 2022

Fire

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The flow and dispersion characteristics of the fire extinguishing agent in the pipings and the concentration distribution in the nacelle are essential for optimizing the aircraft fire extinguishing system. In the present work, we developed a three-dimensional CFD model to simulate the transport and dispersion of the agent in piping and nacelle. The results show that the length and structure of the pipings near the nozzles affect the concentration, pressure, flow rate, and flow distribution of the extinguishing agent. The smaller the bend of the pipings near the nozzles and the angle of connection with the main piping, the less time it takes for the agent to reach the nozzles and the more mass flow rate of the agent is injected, which is more conducive to extinguishing fire rapidly. External ventilation and the blockage of the nacelle’s ribs and other components impact the concentration distribution of the fire extinguishing agent in the nacelle. The agent is mainly concentrated in the middle and rear areas of the engine nacelle. Agent concentration tests were carried out in the simulated engine nacelle. The experimental result is similar to the simulation result, which verifies the feasibility of the simulation method. The simulation method can be used to increase the concentration of fire extinguishing agent to meet the safety requirements by changing the outside ventilation and increasing the filling amount of fire extinguishing agent, so as to achieve the optimization of the fire extinguishing system.

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Simulation on Flow Rate Characteristics of Gas Fire Extinguishing Agent with Expansion Nozzle Based on AMESim

Cited by 2 publications

References 0 publications

Simulation Study on Aircraft Fire Extinguishing Pipeline with Different Filling Conditions and Pipeline Characteristics

Simulation Study on Aircraft Fire Extinguishing Pipeline with Different Filling Conditions and Pipeline Characteristics

Simulation of Fire Extinguishing Agent Transport and Dispersion in Aircraft Engine Nacelle

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