Method for simulating concentration of aircraft cabin fluid extinguishing agent

A simulation method and fire extinguishing agent technology, applied in design optimization/simulation, geometric CAD, etc., can solve the problems of inability to fully obtain the volume concentration distribution of fire extinguishing agent, poor test repeatability, waste of manpower and material resources, etc., to save research and development costs and time, The effect of improving system design efficiency

Pending Publication Date: 2020-04-10
天津航空机电有限公司
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AI Technical Summary

Problems solved by technology

However, the spray test has many disadvantages. Firstly, due to the limitation of the concentration detector, it is impossible to fully obtain the global volume concentration distribution of the fire extinguishing agent in the test chamber; in addition, carrying out the spray test under normal cruise state will waste a lot of manpower and material resources, and the test repeatability is poor.

Method used

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  • Method for simulating concentration of aircraft cabin fluid extinguishing agent
  • Method for simulating concentration of aircraft cabin fluid extinguishing agent
  • Method for simulating concentration of aircraft cabin fluid extinguishing agent

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with drawings and embodiments.

[0044] In the present invention, taking a certain type of engine compartment as an example, the numerical simulation method is used to analyze the concentration distribution of the fire extinguishing agent in the compartment during the spraying process of the halon fire extinguishing agent, figure 1 Implementation flowchart for the present invention, concrete steps are as follows:

[0045] figure 2 is a simplified three-dimensional geometric model of a certain type of engine compartment, image 3 is the slope map of the flow field.

[0046] Simplify the nozzle holes through the layout of the fire extinguishing pipe network, Figure 4 In order to simplify the layout position of the fire extinguishing pipe network before, Figure 5 Injection points for pipelines after simplification.

[0047] Divide calculation mesh: use Mesh module to carry out automatic mesh divis...

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Abstract

The invention belongs to the technical field of aircraft fire prevention and extinguishing, and particularly provides an aircraft cabin liquid fire extinguishing agent concentration simulation methodwhich comprises the following steps: 1) adding a physical field and a research type; 2) importing a geometric model of the cabin and simplifying; 3) carrying out simulation equivalence on a fire extinguishing spraying position; 4) setting a grid type and a grid size, and dividing grids; 5) setting a simulation model; 6) setting Haron fire extinguishing agent material parameters and initial boundary conditions; 7) initializing the system; according to the method, the fluid fire extinguishing agent spraying process is simulated through the finite volume principle, waste of manpower and materialresources in a traditional concentration test is effectively avoided, and cabin fire extinguishing agent distribution data obtained through the method have certain guiding significance in actual airplane cabin fire extinguishing system design.

Description

technical field [0001] The invention belongs to the technical field of aircraft fire prevention and extinguishing, and specifically provides an aircraft cabin liquid fire extinguishing agent concentration simulation method. Background technique [0002] According to the design requirements of "GJB3275 Aircraft Fire Extinguishing System Installation and Test Requirements" on military aircraft engine compartment fire extinguishing system, the volume concentration of the fire extinguishing agent formed in the engine compartment protection area after HALON1301 fire extinguishing agent injection should be at least 6% (mass concentration should reach at least 22%) %), under normal cruising status, the fire extinguishing agent concentration should last no less than 0.5s in the protected area. At present, the fire extinguishing system of the existing aircraft cabin is mostly limited to the spray test in the design of the fire extinguishing system. However, the spray test has many d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/15G06F30/23
Inventor 王胜东张志伟
Owner 天津航空机电有限公司
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