| Summary: | Theoretically, detonation wave propagated in combustible gas mixture can be suppressed by chemical and physical method. Although both methods are possible to be implemented in industrial fields, the
physical method is more interesting due to its simplicity and flexibility. In physical method, the detonation wave is transformed to be deflagration wave by mechanism of diffraction by an expansion wave. However, the diffraction mechanism itself is very difficult to be analyzed due to 3-dimensional effects of detonation flow field. In this experiment, the 3-dimensional effects are reduced by using single gap orifice diffracting detonation to 2 directions. Single gap orifice made from aluminum material was installed into detonation tube filled by stoichiometric condition of hydrogen-oxygen mixture with an initial pressure of 50 kPa. The detonation wave diffracted from the model in over driven mode is quickly decayed to condition which lower than Chapman-Jouguet condition. The decreasing of the detonation wave velocity along diffraction process is caused by an expansion wave around corner of the model and it reduces pressure and temperature behind the shock wave. The decreasing of pressure and temperature behind the shock wave will reduce rate of the chemical
reaction and detach it from the shock wave.
Keywords: deflagation, detonation, shock wave, diffraction
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