Possibility of detonation occurrence in high velocity flows

In the present study a method for investigation of possibility of detonation in high speed flows based on available experimental data have been described. For this purpose, different kind of important parameters that were needed for possibility of detonation were evaluated. These parameters are included; detonability limit of the mixture and effect of neutral additives, kind of confinement, geometry and dimensions, type of initiation including direct and DDT initiation and special properties of the mixture like; pressure, temperature and velocity. The information and how to use these parameters for analysis of problem was presented. This method is specifically used in discharging of a supersonic jet containing hydrogen in three different modes of operation. the results show the limit area of danger is located 2 to 8 meters in area outlet. On the other hand, considering of experimental data was demonstrated that the presence of water vapor can decrease the possibility of detonation and The maximum permitted percentage of water vapor has been determined about 30% for detonability of the mixture. With considering high percentage of water wapor in the area of danger it is determined that this region is not detonable.