Research on Detonation of Moving Fuel and Air Mixtures in Large Scale

Author:Wang Zuo

Supervisor:bai chun hua

Database:Doctor

Degree Year:2017

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Pages:132

Size:4127K

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Fuel air mixture detonation refers to fuel under movement condition mixing with air,and then is detonated.Detonation of fuel air mixtures are preceding issue in safety science and engneering and detonics research.In this paper,the methods for detonation of moving large-scale fuel air mixtures are established.The dispersal characteristics and detonation of moving large-scale fuel air mixtures are studied by using the new methods.The main research results are as follows:(1)The experiment systems for detonation characteristics of moving large-scale fuel air mixtures are established.The issue research on dispersal and detonation characteristics of moving large-scale fuel air mixtures has been achieved.The system consists of air release subsystem,parachute fuel device subsystem and testing subsystem,etc.Based on the experiment system,movement,dispersal and detonation characteristics of moving large-scale fuel air mixtures are studied.(2)The movement characteristics of umbrella fuel device subsystem are studied.The motion attitude for parachute fuel device and spread of secondary initiation point are analyzed.The falling process of parachute fuel device accords with damping swing.The longer the parachute rope is,the bigger the swinging angle is.The falling trajectory of initiation device after fuel dispersion accords with uniform motion.Swinging angle of parachute,the velocity of secondary initiation device and delayed time influence initiationdevice trajectory.And the spread area of secondary initiation point is obtained.(3)The dispersion process for liquid-solid fuel mixing with air under movement is studied.The dispersion process for moving fuel air mixtures under different canister and falling velocity is obtained.The difference of moving and stastic dispersion parameters are compared and analyzed.The results show that radius of moving mixture comparing with static mixture have a significant difference.Under stiffener device structure,radius of moving mixture comparing with static mixture present the tendency to become smaller after the first equals.The difference between maximum radius for moving and static mixture under stability condition is 12.02%;the difference under non-stiffener device structure is 16.06%.(4)Based on the studied in the above,the moving detonation process for gas-solid-liquid three-phase mixture is studied.The difference of moving and stastic peak overpressure parameters are compared and analyzed.The results show that the peak overpressure increas 18.5%,comparing with static peak overpressure under the stiffener device structure.However,the peak overpressure increase 23.4%,comparing with static peak overpressure under the non-stiffener device structure.In this paper,the new methods for detonation characteristics of moving large fuel air mixtures are established.The dispersal and detonation characteristics of moving large fuel air mixtures are obtained.Also,the differences between dispersal and detonation characteristics of moving and static mixture are obtained.The research results could be a direct guidance for prevetion and control gas-solid-liquid three-phasemixture explosion accident.Meanwile,it could make contributions to the development of multiphase detonics.