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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
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中文摘要:
      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9.18 MPa增大到15.30 MPa, t=4 ms射流轴向位移增加了20.9%;当喷孔直径从1.4 mm增大到2.0 mm时,轴向位移较快,气液掺混较剧烈, t=5 ms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20 mm时, t=5 ms射流轴向位移减小了20.6%。
中文关键词: 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
英文摘要:
      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 ratio ΔD/L increases from 0.3 to 0.6, the axial displacement of the jet decreases by 10.8%. With increasing the injection pressure, the gas jet intensity increases. When the injection pressure increases from 9.18 MPa to 15.30 MPa, jet axial displacement increases by 20.9% at 4 ms. When the nozzle diameter increases from 1.4 mm to 2.0 mm, the gas-liquid mixing is more intense, and the jet axial displacement increases by 24.1% at 5 ms. Increasing the nozzle center interval can make the radial expansion more fully and reduce the axial expansion process. When the nozzle center interval increases from 16 mm to 20 mm, the axial displacement reduces by 20.6% at 5 ms.
英文关键词: bulk-loaded propellant guns  four combustion-gas jets  Taylor expansion characteristics  stepped-wall type observation chamber
DOI:10.11943/j.issn.1006-9941.2017.12.006
基金项目:国家自然科学基金资助(51506096);江苏省自然科学基金(BK20150765)
引用文献:冯博声,薛晓春.四股燃气射流在整装式液体中扩展特性的实验研究[J].含能材料,2017,25(12):1004~1010
作者单位E-mail
冯博声 南京理工大学能源与动力工程学院, 江苏 南京 210094 fengbs720@163.com,xiaochun13476@163.com 
薛晓春 南京理工大学能源与动力工程学院, 江苏 南京 210094 xiaochun13476@163.com 
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