气相爆轰波在半圆形弯管中传播现象的实验研究  

Experimental investigation on gaseous detonation propagation through a semi-circle bend tube

作　　者：王昌建[1] 徐胜利[1] 郭长铭[1] 

机构地区：[1]中国科学技术大学力学和机械工程系,安徽合肥230026

出　　处：《爆炸与冲击》2003年第5期448-453,共6页Explosion and Shock Waves

基　　金：国家自然科学基金项目(10172083);国家自然科学基金委员会和中国工程物理研究院联合基金项目(10076018)

摘　　要：对气相(2H2/O2/Ar系统)爆轰波在半圆形弯管中的传播现象进行实验研究。用烟迹膜记录了弯管中爆轰波的胞格结构,采用压电传感器测量了沿弯管内外母线指定点的压力时间曲线,得到了爆轰波沿弯管内、外母线的平均速度和胞格尺寸的变化。结果表明:当平面爆轰波进入弯管后,受壁面的几何形状作用,诱导激波阵面发生弯曲。沿诱导激波阵面,自内母线到外母线方向,激波强度逐渐增大。同时,爆轰波后的化学反应区也受到影响,胞格尺寸发生较明显的变化。在本文条件下,当初压p0≥8.00kPa,受扰动的爆轰波在弯管出口下游仍恢复为强度不变的稳定爆轰。胞格记录的三波点迹线表明:受扰动的爆轰波在出口段发生了马赫反射。实验结果还表明:当p0降至5.33kPa,平面稳定爆轰波经过半圆形弯管后,其强度发生衰减并直至出现熄灭。The paper presents the results of experimental investigation on gaseous detonation of 2H2/O2/Ar mixture propagation through a semi-circle bend tube with a square cross-section. The pressure time history at specific ports was recorded by pizeo-electric transducers and cellular patterns were recorded by smoked foil respectively. The average velocity of detonation along the concave and convex wall and the change of cell size were obtained. Experimental results indicate that originally planer precursor front is curved when detonation wave enters the bend tube due to the interactions among the detonation wave, rarefaction wave and reflected shock wave. Along the front, from convex to concave wall, the precursor strength is increased. Influenced by this change, the chemical reaction behind the front is also disturbed, and the cell size is obviously changed. Under the conditions in our experiments, when initial pressure P0 is larger than 8.00kPa, the stable detonation wave with the same cell size as the undisturbed one is re-established in the downstream region. The trajectory of triple points in cellular patterns denotes the Mach reflection occurs in downstream region of bend tube. Detonation extinguishes in downstream region of the bend tube, as the initial pressure decreases to 5.33kPa.

关 键 词：气相爆轰波 半圆形弯管 传播现象 实验研究 爆炸力学 诱导激波 胞格结构 马赫反射 

分 类 号：O382.3[理学—流体力学]