含典型装药裂纹模拟发动机点火瞬态试验研究

The Experimental Research on Ignition Transient in Simulative Motors with Typical Crack

对典型装药裂纹在模拟发动机点火瞬间的压强变化情况进行试验研究,研究了不同深度裂纹在不同点火升压速率、不同裂纹开口方向情况下裂纹尖端、裂纹入口以及燃烧室的压强变化情况。试验结果表明:裂纹开口方向对裂纹内压强变化影响不大,裂纹尖端压强峰值以及与燃烧室压强比的最大值受增压和几何条件的影响;增压越大,裂纹越深,压强峰值和压强比越大。

The pressure in the typical crack of simulative motor was studied by test in order to analyze the effects of pressurization rate,crack-gap depth and crack orientation on the crack tip pressure,crack inlet pressure and chamber pressure.The result indicates the crack orientation has little effect on the pressure in the crack;the maximum pressure in crack tip and the pressure rate between crack tip pressure and chamber pressure increases with an increase in pressurization rate and the depth of crack.