Method for simulating concentration of aircraft cabin fluid extinguishing agent

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...

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.

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