前混合磨料水射流切割HTPB推进剂的可行性研究
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摘要
针对前混合磨料水射流切割HTPB推进剂的过程安全性和效率,开展了理论分析与试验验证。在理论分析的结果上,分别开展了基于固定和移动两种试验模式下的安全性和效率试验。该切割方式由于有效降低了出口压力,在保证切割能力的前提下其冲击压力远远低于推进剂的冲击感度,导致推进剂内部升温不明显,安全性有足够保证。研究结果表明,在90%的置信水平下,切割的安全可靠度不低于99.52%。而磨料粒子的添加极大地提高了射流的切割效率。试验结果表明,当保持出口压力30 MPa以上、磨料质量分数不低于50%时,磨料水射流约为相同条件下纯水射流切割效率的2倍。由此得出可行性结论:由于前混合磨料水射流具有极强的冷态冲蚀磨削作用,在安全性和效率方面均能够满足对三组元HTPB推进剂的切割作业。
Process safety and efficiency of cutting test of HTPB propellant by pre-mixed abrasive water jet was stu-died. Based on theoretical analysis, safety and cutting efficiency of the cutting process were tested by fixed and moving cutting modes.It shows that, the cutting method effectively reduces the outlet pressure, and the impact pressure is far lower than the impact sensitivity under the premise of ensuring the cutting ability. The internal temperature rise is insignificant, so the safety is guaranteed. The research results show that at 90% confidence level, the safety of cutting is no less than 99.52%. Mereover,addition of abrasive particles greatly improves the cutting efficiency of the jet. When the outlet pressure is maintained above 30 MPa and the abrasive concentration is no less than 50%, cutting efficiency of the abrasive water jet is twice of that of the pure water jet under the same conditions. The study shows that the pre-mixed abrasive water jet has a strong cold erosion grinding effect, which can meet the cutting operation of the three component HTPB propellant in terms of safety and efficiency.
Process safety and efficiency of cutting test of HTPB propellant by pre-mixed abrasive water jet was stu-died. Based on theoretical analysis, safety and cutting efficiency of the cutting process were tested by fixed and moving cutting modes.It shows that, the cutting method effectively reduces the outlet pressure, and the impact pressure is far lower than the impact sensitivity under the premise of ensuring the cutting ability. The internal temperature rise is insignificant, so the safety is guaranteed. The research results show that at 90% confidence level, the safety of cutting is no less than 99.52%. Mereover,addition of abrasive particles greatly improves the cutting efficiency of the jet. When the outlet pressure is maintained above 30 MPa and the abrasive concentration is no less than 50%, cutting efficiency of the abrasive water jet is twice of that of the pure water jet under the same conditions. The study shows that the pre-mixed abrasive water jet has a strong cold erosion grinding effect, which can meet the cutting operation of the three component HTPB propellant in terms of safety and efficiency.
引文
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[2] 朱左明,高鑫,王煊军,等.高压水射流冲击HTPB推进剂的安全性分析[J].爆炸与冲击,2015,35(3):366-371.ZHU Z M, GAO X, WANG X J, et al.Safety analysis of high-pressure waterjet impacting HTPB propellant[J].Explosion and Shock Waves,2015,35(3): 366-371.
[3] BOGGS T L, ATWOOD A I, LINDFORS A J, et al. Hazards associated with solid propellants[M]//THOMAS B B, REN W Z, YANG V.Solid Propellant Chemistry, Combustion and Motor Interior Ballistics. Virginia:Ame-rican Institute of Aeronautics and Astronautics,2000: 221-262.
[4] 卫玉章.非均匀炸药的冲击引爆综合判据[J].爆炸与冲击,1982,2(1): 117-121.WEI Y Z. A complete criterion for shock initiation of detonation in heterogeneous explosives[J].Explosion and Shock Waves,1982,2(1): 117-121.
[5] 李晓红,卢义玉,向文英.水射流理论及在矿业工程中的应用[M].重庆:重庆大学出版社,2007.
[6] LABUS T J.Fluid jet technology:fundamentals and application[M].USA:American Water Jet Technology Asso-ciation,1995.
[7] 何远航,郁红陶,张庆明.固体推进剂在高压水射流作用下的点火模式[J].北京理工大学学报,2008, 28(2): 97-99.HE Y H, YU H T, ZHANG Q M.Ignition mode of solid propellant with high-pressure waterjet[J].Transactions of Beijing Insititute of Technology,2008, 28(2): 97-99.
[8] 蒋旭平,胡寿根,钟声玉.高压水射流冲击特性分析及实验研究[J].上海机械学院学报,1991, 13(2): 107-110.JIANG X P, HU S G, ZHONG S Y.Experimental investigations of impact pressure in high-pressure waterjet [J].Journal of Shanghai Institute of Mechanical Engineering,1991, 13(2): 107-110.
[9] ORBANIC H,JUNKAR M.Analysis of striation formation mechanism in abrasive water jet cutting[J].Wear,2008,26(5):821-830.
[10] 李宝玉.易燃易爆环境下安全切割装置的研制[J].流体机械,2005, 33(2): 42-44.LI B Y. Development of safe cutting device in inflam-mable and explosive place[J].Fluid Machinery,2005, 33(2): 42-44.
[11] 廖勇.高围压下磨料水射流切割的模糊建模和实验研究[D].重庆:重庆大学,2003.LIAO Y. Fuzzy modeling and experiment research on AWJ cutting under the high confining pressure[D].Chongqing:Chongqing University,2003.
[12] 蒋大勇. 废弃HTPB推进剂预处理与再利用中关键问题研究[D].西安:第二炮兵工程学院,2011.