Research On Pneumatic Fire-extinguish Cannon For High-rise Building

For the situation that it’s difficult to put out high-rise and ultra-high-rise building fire byusing existing fire-extinguish equipment, Research on pneumatic fire-extinguish cannon forhigh-rise building is studied in this paper. The existing means to put out the high-rise buildingfire mainly is that people go into the internal fire scene and use small equipment for theregional fire-fighting and combine with using fire blisters for long-range spray from theoutside. This kind of fire-extinguishing method for high-rise building upper fire is oftenhelpless.Research on pneumatic fire-extinguish cannon for high-rise building studied in this papercan remotely emission the fire-extinguish bomb equipped with fire-extinguish agent to theinternal fire scene to carry out blasting for dispersion extinguishing, and it can compensate forthe inadequacies of fire-extinguish equipment. The system is equipped with movable vectorand fire control computer system, and its pneumatic emission method which is no power isadopted. According to the floor height and room size of existing buildings in China, thecorresponding research on firing data and missile-borne fire-extinguish doses are done. So thesystem has the reliable guarantee and applicability on the shooting accuracy, the urban useenvironment and the actual fire-Fighting effect. This system not only can be used for high-risebuilding fire extinguishing, but also can realize remote fire-fighting operations on severaloccasions, such as forest, airports, warehouses, petrochemical enterprise, storage tank area,port, etc.First of all, the characteristics of modern high-rise building fire, application anddevelopment status of high-rise building fire technology are studied in this paper. Accordingto actual demand, the pneumatic fire-extinguish gun system program which is suitable forremote high-rise fire-fighting extinguishing is determined. Then this paper investigates theworking mechanism of pneumatic fire-extinguish gun and carry out detailed research anddesign on firing mechanism. The design adopt servo launch by the associated tube, solvingthe problem that the total launch pressure transiently within the chamber when launching thecannon. Finally comprehensive and systematic research and design on mechanical structureand control system of fire-extinguish gun are carried out，and auxiliary equipment offire-fighting cannon are configured.Based on the structural characterizes of firing mechanism in the study, dynamic analysisof the firing process is carried out, and dynamic model of the firing process and the model ofgas parameters in the chamber are established, and motion equation of projectile during firingprocess is given. Through the simulation analysis of firing process at MATLAB environment,the variation characteristics of gas parameters in bore are obtained. The impact of differentfiring angle on the firing characteristics was studied, and the optimal firing angle wasobtained. The dynamic process of the firing mechanism is studied by using the softwareANSYS. The result shows that the firing mechanism with associated tube can effectively solve the problem of high-pressure gas reaching the total launching pressure within thechamber transiently.According to analysis of motion process of fire-Fighting bomb in the chamber, thedynamic model of projectile during motion process and the gas dynamic model during gasexpansion process in the space after projectile are established. By using the softwareMATLAB, kinematics and dynamic analysis calculation in firing and launching process arecarried on, and the relation curve of muzzle initial velocity and firing pressure in the chamberis established and the corresponding relation table is drawn. According to the interior ballisticequations, the change curve of recoil force in the firing process varied with time is deduced.By using dynamic analysis software, the simulation analysis of dynamic response of the gunbarrel in firing process is carried out, and the curve of dynamic response of the gun barrelwith different firing angle is gained and the emission stability of the fire-extinguish gun isverified.Based on the classic theory of artillery exterior ballistics, exterior ballistics of thefire-extinguish bomb is analyzed and the mathematical model of the external ballistics isestablished. According to the impact requirements of target shooting point for fire-extinguishbombs, such as the parameters of penetration angle, the optimization equations of exteriorballistics as fire bombs hit the target shooting point is established. And then correspondingrelationship between the parameters of the target shooting point and firing pressure and firingangle are determined. Thus fire-Fighting artillery table database is established, and then theinquiry way of the table is planned.According to the characterizes of different high-rise building fire scene, parametercalculation of the target shooting point in rectangular coordinates and sphere coordinatesystem is studied, and the mathematical model for parameter calculation of the target shootingpoint is established. According to the characterizes of the parameter calculation and theinquiry way of the table database, the structure of control system software of thefire-extinguish gun is studied, and then the software system of high-rise buildingfire-extinguish gun is studied and designed.According to the working characteristics of fire-fighting cannon and fire environment todetermine the overall program of fire-fighting bombs, and then emphatically describes themethods and processes of the airframe structure and fuse control system. On this basis, thesupported load condition as the bomb emission has been studied deeply, and under thisenvironment the launching security analysis of the key parts of the airframe is analyzed byusing ANSYS software.