Thermal safety of modular charge which is fed into and retained in the chamber after gun fires consecutively is first investigated with cook-off method.A two-dimensional cook-off model of modular charge in gun chamber is established and the cook-off process of modular charge in gun chamber is numerically simulated.Then the effects of module number and firing condition on charge thermal safety are evaluated by researching the cook-off response characteristics of modules.The results show that,under conditions of different module numbers the cook-off responses all occur on the module closest to the boundary of missile,and the single-base propellants located at the inner surface of cartridge ignite first.When the number of loaded module changes from 1 to 6,the cook-off response temperatures vary little,only in a small range of 478.1 K-482.4 K.The cook-off response times decrease logarithmically in the range of 211.2 s-166.7 s with the increasing length of residual air gap in gun chamber.The simulation results are well matched with the experimental data.Furthermore,different firing conditions have great influence on the cook-off response time,minor influence on the initial response position and little in-fluence on the response temperature.Under the three conditions of consecutive 32 launches with 5 rounds/min,43 launches with 1 round/min,and 41 launches with different firing frequencies,the cook-off response temperatures are 479.2 K,481.1 K and 479.9 K respectively and the response times are 709.2 s,211.2 s and 214.4 s respectively.The response position is near the middle area of the inner cartridge surface in the former condition and near the right area in the latter two conditions.

Huan-yu Qian;Yong-gang Yu;Jing Liu

School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing,210094,China;Academy of Opto-Electronic,China Electronics Technology Group Corporation (AOE CETC),Tianjin,300308,China

防务技术

[1]Huan-yu Qian;Yong-gang Yu;Jing Liu-.Effects of module number and firing condition on charge thermal safety in gun chamber)[J].防务技术,2022(01):27-37

cartridge,ignite

Effects,firing,charge,thermal,safety,gun,chamber,Thermal,modular,which,fed,into,retained,after,fires,consecutively,first,investigated,cook,off,method,two,dimensional,model,established,process,numerically,simulated,Then,effects,evaluated,by,researching,characteristics,modules,results,show,that,under,conditions,different,numbers,responses,occur,closest,boundary,missile,single,base,propellants,located,inner,surface,When,loaded,changes,from,temperatures,vary,little,only,small,range,times,decrease,logarithmically,increasing,length,residual,air,gap,simulation,well,matched,experimental,data,Furthermore,have,great,influence,minor,initial,position,Under,three,launches,rounds,frequencies,respectively,near,middle,area,former,right,latter

0.407702