Self-ignition of hydrogen-air mixtures behind reflected explosive waves

Experimental results are given, which reveal the special features of selfignition of hydrogen-air gas mixtures behind reflected explosive pressure waves at moderate (below 1200 K) temperature and elevated pressure. The experiments are performed in a modified shock tube which provides for generation of explosive pressure waves. The explosive waves are characterized by a jump of parameters of shock-compressed gas (pressure, temperature) at the front with their subsequent continuous decrease. This is how undesirable gas-dynamic effects are attenuated, which are due to hypothetical pre-explosion preheating of combustible mixture by compression waves. As previously, the experiments involving standard shock waves (with constant pressure/temperature levels) revealed a significant (by a factor often and more) deviation of measured values of delay of selfignition from the calculated values towards decreasing.