共查询到16条相似文献,搜索用时 156 毫秒
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采用燃烧转爆轰(DDT)管法研究了p(BAMO-AMMO)热塑性推进剂主要固体组分RDX和AP含量、AP粒度及级配等对其燃烧转爆轰响应规律的影响。结果表明,在相同试验条件下,含质量分数65%AP的p(BAMOAMMO)推进剂发生了燃烧转爆轰响应,而含等量RDX的p(BAMO-AMMO)推进剂仅发生了燃烧反应。当RDX质量分数从65%增加到85%时,样品由燃烧反应变为燃烧转爆轰反应。含等量细粒度(d50=1.0μm)AP的推进剂发生燃烧转爆轰的倾向较含粗粒度AP(d50=105μm)的低。当粗、细AP以质量比为10∶3级配时,p(BAMOAMMO)推进剂未发生燃烧转爆轰反应。 相似文献
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用ACP提高固体推进剂的燃速 总被引:3,自引:2,他引:3
用快燃物ACP提高改性双基推进剂、AP/HTPB复合推进剂和N-15D推进剂的燃速,取得了非常显著的效果。在HMX和RDX改性双基推进剂配方中加入不同粒度不同含量的ACP,推进剂的燃速均能提高,压强指数基本无变化。在AP基复合推进剂配方中加入ACP,其燃速均有不同程度的提高,而且在7~15MPa的压强范围内,压强指数小于0.45。成功地进行Ф64mm发动机试验,并获得稳定的P-t曲线。N-15D推进剂配方的燃速较低,加入ACP后,燃速也有提高,压强指数稍有增大。结果表明,加入ACP后燃速提高效率分别是:HMX改性双基推进剂配方为40.62%,RDX改性双基推进剂配方为38.00%,复合推进剂配方为37.35%,N-15D推进剂配方为9.90%。 相似文献
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利用俄国Flame数据库中若干个具有100℃(初温)燃速值的双基系推进剂配方及其它数据资料,分析了初温为100℃时双基及改性双基推进剂的燃烧特性及组分对燃烧特性的影响。 相似文献
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NEPE推进剂的燃烧转爆轰特性 总被引:1,自引:3,他引:1
介绍了燃烧转爆轰的研究方法、表征参数和影响因素.用DDT管、光电管、应变片、验证板研究了NEPE推进剂混合过程中的燃烧转爆轰特性.研究结果表明,NEPE推进剂药浆的诱导爆轰距离与其在DDT管中的装填密度存在典型的U形曲线关系;当实际装填密度大于理论装填密度的95%时,NEPE推进剂药浆在试验条件下无法发生燃烧转爆轰,同时,NEPE推进剂药浆的诱导爆轰距离与DDT管的破碎程度具有较好的相关性,诱导爆轰距离越小,DDT管的破碎程度越严重.由于立式混合机的密闭性及混合过程中推进剂药浆的不均匀性,NEPE推进剂在混合过程中存在燃烧转爆轰的可能性. 相似文献
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Taihua Zhang YilongL. Bai ShiyingY. Wang PeideD. Liu 《Propellants, Explosives, Pyrotechnics》2003,28(1):37-42
In order to assess the safety of high‐energy solid propellants, the effects of damage on deflagration‐to‐detonation transition (DDT) in a nitrate ester plasticized polyether (NEPE) propellant, is investigated. A comparison of DDT in the original and impacted propellants was studied in steel tubes with synchronous optoelectronic triodes and strain gauges. The experimental results indicate that the microstructural damage in the propellant enhances its transition rate from deflagration to detonation and causes its increased sensitivity. It is suggested that the mechanical properties of the propellant should be improved to reduce its damage so that the probability of DDT might be reduced. 相似文献
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铝粉-空气混合物的燃烧转爆轰过程 总被引:2,自引:0,他引:2
利用自行设计的长29.6 m、内径199 mm配有40套喷粉扬尘装置的大型水平爆轰管,研究了细片状铝粉-空气混合物在40 J弱点火条件下火焰从发生到加速、最后实现爆轰转捩的全过程,探讨了铝粉浓度和点火延迟时间对爆轰参数的影响.结果表明,铝粉-空气混合物燃烧转爆轰(DDT)过程可分为慢速反应压缩阶段和快速反应冲击阶段.当点火延迟时间为370 ms,铝粉质量浓度为300 g/m~3时,在管道中距离点火位置83倍长径比处峰值超压为9.8 MPa,爆速为1 670 m/s,发生了DDT过程.在铝粉-空气混合物自持爆轰波的传播过程中,由于呈现螺旋爆轰波结构,爆速和峰值超压随着传播距离振荡. 相似文献
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Qingming Liu Chuhua Bai Wenxi Dai Li Jiang 《Combustion, Explosion, and Shock Waves》2011,47(4):448-456
The characteristics and stages of the deflagration-to-detonation transition (DDT) in isopropyl nitrate (IPN) mist/air mixtures
are studied and analyzed. A self-sustained detonation wave forms, as is observed from the existence of a transverse wave and
a spinning wave structure. The run-up distance of the DDT process and the pitch size of the self-sustained spinning detonation
wave in IPN/air mixtures are analyzed. Moreover, a retonation wave forms during the DDT process. Two propagation modes, the
high-speed deflagration mode and the self-sustained detonation mode, of the shock-reaction complex (SRC) in IPN mist/air mixtures
are found and analyzed. The influence of the mist concentration on the SRC propagation mechanism is studied. The minimum and
the optimum IPN mist concentrations for DDT occurrence in IPN mist/air mixtures are determined. The propagation velocity and
overpressure of the self-sustained detonation wave in IPN mist/air mixtures are measured and calculated. 相似文献
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A. A. Vasil’ev 《Combustion, Explosion, and Shock Waves》2006,42(2):205-209
An estimate is proposed for the critical Mach number of the shock wave that can ensure the deflagration-to-detonation transition
(DDT): Mmin ≈ 0.56M0 for expanding waves and Mmin ≈ 0.33M0 for plane waves propagating in a constant-section straight tube (M0 is the Mach number of an ideal Chapman—Jouguet detonation wave). The condition M > Mmin ensures the DDT mode, whereas only laminar or turbulent burning without the DDT is observed for lower Mach numbers. The estimate
is based on the equiprobable transition from the compressed state of the initial mixture both to the detonation and to the
deflagration branch of the adiabat of reaction products (with respect to the initial state of the combustible mixture).
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Translated from Fizika Goreniya i Vzryva, Vol. 42, No. 2, pp. 91–96, March–April, 2006. 相似文献