四股燃气射流在整装式液体中扩展特性的实验研究  

Experimental Study on Expansion Characteristics of Four Combustion-gas Jet in Bulk-loaded Liquid

作　　者：冯博声 薛晓春[1] FENG Bosheng;XUE Xiaochun(School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学能源与动力工程学院,江苏南京210094

出　　处：《含能材料》2017年第12期1004-1010,共7页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金资助(51506096);江苏省自然科学基金(BK20150765)

摘　　要：为了探索控制整装式液体发射药火炮燃烧稳定性的方法,设计了多结构的圆柱及圆柱渐扩型观察室,利用高速数字录像系统记录了四股燃气射流的扩展过程,通过处理射流扩展过程的序列图,得到不同时刻燃气射流头部的平均轴向位移,对比了采用不同渐扩比的A型、B型和G型观察室以及在A型观察室中不同喷孔压力、喷孔直径、喷孔中心间距等参数对四股燃气射流在液体工质中扩展特性的影响。实验结果表明:多级渐扩型结构能够通过台阶的诱导作用,增强射流径向扰动,当渐扩比(ΔD/L)从0.3增加到0.6,射流轴向位移减小了10.8%;随着喷孔压力增大,气体射流强度增大,喷孔压力从9.18MPa增大到15.30MPa,t=4ms射流轴向位移增加了20.9%;当喷孔直径从1.4mm增大到2.0mm时,轴向位移较快,气液掺混较剧烈,t=5ms射流轴向位移增加了24.1%;增大喷孔中心间距,可以使径向扩展更加充分,减慢轴向扩展,当喷孔间距从16mm增大20mm时,t=5ms射流轴向位移减小了20.6%。To explore the method of controlling the combustion stability of bulk-loaded propellant guns,the multi-structure cylindrical and cylindrical stepped-wall type observation chambers were designed to analyze the expansion processes of four combustion-gas jets by the high-speed digital recording system.The average axial displacements of the combustion-gas jet head at different times were obtained by processing the sequence diagrams of the jet expansion process.and the effects of A-type,B-type and G-type observation chambers with different expanding ratios and different jet pressures,nozzle diameters and nozzle center interval etc.parameters in A-type observation chamber on the expansion characteristics of four combustion-gas jet in liquid medium were compared.The experimental results show that the stepped-wall type structure can enhance the radial disturbance of the jet due to the induction of the step.When the expanding ratioΔD/L increases from0.3to0.6,the axial displacement of the jet decreases by10.8%.With increasing the injection pressure,the gas jet intensity increases.When the injection pressure increases from9.18MPa to15.30MPa,jet axial displacement increases by20.9%at4ms.When the nozzle diameter increases from1.4mm to2.0mm,the gas-liquid mixing is more intense,and the jet axial displacement increases by24.1%at5ms.Increasing the nozzle center interval can make the radial expansion more fully and reduce the axial expansion process.When the nozzle center interval increases from16mm to20mm,the axial displacement reduces by20.6%at5ms.

关 键 词：整装式液体发射药火炮 四股燃气射流 Taylor扩展特性 渐扩型观察室 

分 类 号：TJ301[兵器科学与技术—火炮、自动武器与弹药工程]