CN102068776A - Performance optimization method for fixed fire extinguishing system of airplane engine compartment - Google Patents
Performance optimization method for fixed fire extinguishing system of airplane engine compartment Download PDFInfo
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- CN102068776A CN102068776A CN2011100376707A CN201110037670A CN102068776A CN 102068776 A CN102068776 A CN 102068776A CN 2011100376707 A CN2011100376707 A CN 2011100376707A CN 201110037670 A CN201110037670 A CN 201110037670A CN 102068776 A CN102068776 A CN 102068776A
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Abstract
The invention relates to a performance optimization method for a fixed fire extinguishing system of an airplane engine compartment. The optimization method comprises the steps of pipeline optimization and simulation analysis. The performance optimization method for the fixed fire extinguishing system can completely simulate and optimize performance and part parameters of fire extinguishing systems in engine compartments of various types, wherein the performance and part parameters comprise selection of fire extinguishing dose in the fire extinguishing system, optimization determination of fire extinguishing pipeline diameter, flow and pressure of a fire extinguishing agent in the fire extinguishing pipeline, pressure and flow at a fire extinguishing nozzle, distribution condition of the concentration field of the fire extinguishing agent in the engine compartment, duration of the concentration of the fire extinguishing agent and the like. The method can provide theoretical support for research of the fixed fire extinguishing systems in the engine compartments of various airplane types, and avoids rework at the detailed scheme stage of the system so as to shorten the research period of the system, reduce the risk, improve the efficiency and reduce the research cost of the system.
Description
Technical field
The invention belongs to the aeronautical technology field, relate to a kind of aircraft engine nacelle fixed extinguishing system performance optimization method.
Background technology
At present, the aircraft engine nacelle fixed extinguishing system does not disclose complete system function optimization method.Traditional aircraft fixed extinguishing system calculates and only comprises that fire-fighting dose calculates, performance that can't computing system, and all adopt conservative dosage design, and system weight cost, manufacturing cost are higher.The performance of complete fire extinguishing system can only adopt full mould platform agent concentration to measure and verify, causes systematic function to be difficult to optimize, and system development cycle is long, the development cost height.
The fire protection sector standard is (as GB50163-92 both at home and abroad, ISO/DIS7075/1) fire extinguishing system design of pipe networks computational methods are provided, but these computational methods only relate to the designing and calculating of pipeline diameter, can not calculate extinguishing chemical flow accurately, the agent concentration field assessment in the zone of also can't putting out a fire.In order to calculate the system-wide performance of aircraft engine nacelle fixed extinguishing system, need obtain fire extinguishing system injection flow more accurately, and can carry out simulation analysis to reach the purpose of final assessment system-wide performance the agent concentration field in the zone of putting out a fire.
Summary of the invention
The performance computational methods that the purpose of this invention is to provide a kind of complete aircraft engine nacelle fixed extinguishing system.Solution of the present invention is that it optimizes step is that (one) optimizes pipeline:
Step a according to the aircraft fire suppression system scheme, sets fixed extinguishing system pipe network structure, target flow parameter;
Step b establishes 1 node in each bifurcation of fixed extinguishing system, is a plurality of pipeline sections according to node division, divides the pipeline section increase node that back length surpasses 3 meters, this pipeline section is further divided again;
Step c is a design object with system's design discharge, is design variable with system's caliber, and the design and calculation method among the employing GB50163-92 calculates flow, pressure, density of fire suppressant, the caliber of fixed extinguishing system;
Steps d judges according to the result of calculation of step c whether PIPE DIAMETER CALCULATION satisfies the flow design target, if do not satisfy Adjustment System caliber, repeating step c; If satisfy the flow design target, enter next step;
Step e according to steps d PIPE DIAMETER CALCULATION result, is to calculate variable with the flow system flow, calibration pipeline flow system flow;
Step f, output fire extinguishing system pipe network calculates caliber, flow, calculation of pressure result, as the input of system's design and simulation analysis;
(2) simulation analysis
Step a sets up the grid model of enging cabin;
Step b sets up analytical model with flow, the pressure of the output of fire extinguishing system pipe network as the design input;
Step c in step a and step b inlet flow body dynamics software for calculation, calculates, and obtains air velocity distribution, the regional temperature field of putting out a fire, the regional pressure field of putting out a fire in agent concentration field, the fire extinguishing zone.
The advantageous effect that the present invention has:
This fixed extinguishing system performance optimization method can complete simulation optimization goes out the performance and the parameters of operating part of fire extinguishing system in the enging cabin of various types, comprise the selection of the fire-fighting dose that relates in the fire extinguishing system, the optimization of fire-fighting pipeline caliber is determined, the flow and the pressure of extinguishing chemical in the fire-fighting pipeline, the pressure at fighting nozzle place and flow, the distribution situation of agent concentration field in the enging cabin, the duration of agent concentration etc., can provide theoretical to the development of the fixed extinguishing system in the enging cabin of various aircraft models supports, avoid system's detailed protocol stage to occur doing over again, thereby shortening system development cycle, reduce risk, raise the efficiency, reduce the system development cost.
Description of drawings
Fig. 1 is an enging cabin fire extinguishing system performance optimization flow chart of the present invention;
Fig. 2 is an enging cabin fire extinguishing system configuration picture of the present invention.
The specific embodiment
(1) optimize pipeline:
Step a according to the aircraft fire suppression system scheme, sets fixed extinguishing system pipe network structure, target flow parameter;
Step b establishes 1 node in each bifurcation of fixed extinguishing system, is a plurality of pipeline sections according to node division, divides the pipeline section increase node that back length surpasses 3 meters, this pipeline section is further divided again;
Step c is a design object with system's design discharge, is design variable with system's caliber, and the design and calculation method among the employing GB50163-92 calculates flow, pressure, density of fire suppressant, the caliber of fixed extinguishing system;
Steps d judges according to the result of calculation of step c whether PIPE DIAMETER CALCULATION satisfies the flow design target, if do not satisfy Adjustment System caliber, repeating step c; If satisfy the flow design target, enter next step;
Step e according to steps d PIPE DIAMETER CALCULATION result, is to calculate variable with the flow system flow, calibration pipeline flow system flow;
Step f, output fire extinguishing system pipe network calculates caliber, flow, calculation of pressure result, as the input of system's design and simulation analysis;
(2) simulation analysis
Step a sets up the grid model of enging cabin;
Step b sets up analytical model with flow, the pressure of the output of fire extinguishing system pipe network as the design input;
Step c in step a and step b inlet flow body dynamics software for calculation, calculates, and obtains air velocity distribution, the regional temperature field of putting out a fire, the regional pressure field of putting out a fire in agent concentration field, the fire extinguishing zone.
Embodiment:
Carry out performance optimization for certain type aircraft engine nacelle fire extinguishing system, implementation step is as follows:
A, according to the system pipeline deployment scenarios, provide system configuration figure, see shown in Figure 2ly, comprise fire-suppression bottle 1 among the figure, check valve 2, fire-fighting pipeline 3, fighting nozzle 4; Determine design parameters such as aims of systems flow, fire-suppression bottle filling state;
B, 6 nodes (seeing Fig. 2, node 1～node 6) are set divide pipeline 3, pipe network is divided into 5 pipeline sections;
C, calculate ductwork pressure, flow, density of fire suppressant piecemeal, tentatively determine each pipeline section caliber by GB50163-92;
D, judge whether caliber that previous step is calculated satisfies the calculation requirement of GB50163-92;
E, if the caliber that calculates does not satisfy calculation requirement, the redesign pipeline;
F, if the caliber that calculates satisfies calculation requirement, carry out traffic alignment and calculate;
G, according to each pipeline section diameter of system pipeline that step c determines,, carry out traffic alignment and calculate as calculating variable with the extinguishing chemical flow;
H, each pipeline section caliber of output fire extinguishing system, flow, pressure are as system's design considerations and the input of agent concentration field simulation analysis;
Adopt business software Gambit and Fluent to divide and the simulation analysis instrument in i, the present embodiment as grid.At first set up the regional grid model of fire extinguishing, be input among the Fluent, start the discrete items model, calculate nozzle flow, the pressure determined according to pipeline the extinguishing chemical nozzle is set by Gambit.Media property, boundary condition, turbulence model etc. are set, start solver and carry out the calculating of extinguishing chemical injection transient;
J, inspection result of calculation, analysis extinguishing chemical are sprayed the situation of change in the regional interior agent concentration field of back fire extinguishing, air velocity distribution, pressure field, temperature field.
Claims (1)
1. the performance optimization method of an aircraft engine nacelle fixed extinguishing system, it optimizes step is that (one) optimizes pipeline:
Step a according to the aircraft fire suppression system scheme, sets fixed extinguishing system pipe network structure, target flow parameter;
Step b establishes 1 node in each bifurcation of fixed extinguishing system, is a plurality of pipeline sections according to node division, divides the pipeline section increase node that back length surpasses 3 meters, this pipeline section is further divided again;
Step c is a design object with system's design discharge, is design variable with system's caliber, and the design and calculation method among the employing GB50163-92 calculates flow, pressure, density of fire suppressant, the caliber of fixed extinguishing system;
Steps d judges according to the result of calculation of step c whether PIPE DIAMETER CALCULATION satisfies the flow design target, if do not satisfy Adjustment System caliber, repeating step c; If satisfy the flow design target, enter next step;
Step e according to steps d PIPE DIAMETER CALCULATION result, is to calculate variable with the flow system flow, calibration pipeline flow system flow;
Step f, output fire extinguishing system pipe network calculates caliber, flow, calculation of pressure result, as the input of system's design and simulation analysis;
(2) simulation analysis
Step a sets up the grid model of enging cabin;
Step b sets up analytical model with flow, the pressure of the output of fire extinguishing system pipe network as the design input;
Step c in step a and step b inlet flow body dynamics software for calculation, calculates, and obtains air velocity distribution, the regional temperature field of putting out a fire, the regional pressure field of putting out a fire in agent concentration field, the fire extinguishing zone.
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| CN2011100376707A CN102068776A (en) | 2011-02-15 | 2011-02-15 | Performance optimization method for fixed fire extinguishing system of airplane engine compartment |
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| CN2011100376707A CN102068776A (en) | 2011-02-15 | 2011-02-15 | Performance optimization method for fixed fire extinguishing system of airplane engine compartment |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553119A (en) * | 2011-12-22 | 2012-07-11 | 中国科学技术大学 | Device for testing concentration of gas extinguishing agent and testing method thereof |
| CN107122516A (en) * | 2017-03-17 | 2017-09-01 | 浙江工业大学 | A kind of fire extinguishing system loses determination method from segment pipe along stroke pressure |
| CN110064155A (en) * | 2018-01-24 | 2019-07-30 | 开利公司 | Agent injection, evaporation and dispersion calculator |
| CN110082139A (en) * | 2019-04-30 | 2019-08-02 | 中国科学技术大学 | A kind of aircraft engine nacelle Halon Replacement fire extinguishing system lowest performance experimental cabin |
| CN110990942A (en) * | 2019-11-05 | 2020-04-10 | 天津航空机电有限公司 | Aircraft cabin fluid fire extinguishing agent concentration simulation method |
| CN113806863A (en) * | 2021-09-10 | 2021-12-17 | 中国航空工业集团公司沈阳飞机设计研究所 | Design method of fire protection system in aircraft power cabin |
| CN115845290A (en) * | 2022-12-27 | 2023-03-28 | 中国航空工业集团公司西安飞机设计研究所 | Fire extinguishing pipe network for engine compartment |
-
2011
- 2011-02-15 CN CN2011100376707A patent/CN102068776A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102553119A (en) * | 2011-12-22 | 2012-07-11 | 中国科学技术大学 | Device for testing concentration of gas extinguishing agent and testing method thereof |
| CN102553119B (en) * | 2011-12-22 | 2014-01-29 | 中国科学技术大学 | Device for testing concentration of gas extinguishing agent and testing method thereof |
| CN107122516A (en) * | 2017-03-17 | 2017-09-01 | 浙江工业大学 | A kind of fire extinguishing system loses determination method from segment pipe along stroke pressure |
| CN110064155A (en) * | 2018-01-24 | 2019-07-30 | 开利公司 | Agent injection, evaporation and dispersion calculator |
| CN110082139A (en) * | 2019-04-30 | 2019-08-02 | 中国科学技术大学 | A kind of aircraft engine nacelle Halon Replacement fire extinguishing system lowest performance experimental cabin |
| CN110082139B (en) * | 2019-04-30 | 2020-06-26 | 中国科学技术大学 | Minimum performance test cabin of aircraft engine cabin Halon replacing fire extinguishing system |
| CN110990942A (en) * | 2019-11-05 | 2020-04-10 | 天津航空机电有限公司 | Aircraft cabin fluid fire extinguishing agent concentration simulation method |
| CN113806863A (en) * | 2021-09-10 | 2021-12-17 | 中国航空工业集团公司沈阳飞机设计研究所 | Design method of fire protection system in aircraft power cabin |
| CN115845290A (en) * | 2022-12-27 | 2023-03-28 | 中国航空工业集团公司西安飞机设计研究所 | Fire extinguishing pipe network for engine compartment |
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Application publication date: 20110525 |