Experimental Setup Detonation Tube

The detonation facility used for these experiments is a vertical. 5.8-meter-long stainless-steel tube with an inner diameter of 10.25 cm and a wall thickness of approximately 1.9 cm. It is made up of 56 modules, 10.16 cm in height. Each module features four tapped holes separated by 90. Each hole can be fit with a plug, an ionization detector, a pressure transducer, a gas inlet, or a fuel injector. 

The top 4 modules in the tube serve as the initiation section. The bottom 12 modules provide null space that prevents a transition to detonation in the vicinity of the bottom flange (which can lead to dangerously high local pressures). These 16 modules contain only plugs and gas inlets. The remaining 40 modules, in the middle of the tube, are outfitted as described in the previous section with two Siemens DI fuel injectors (for a total of 80 injectors), a plug, and an ionization detector. The detonation facility is shown in Fig. 1.2. 

Initiation of spray detonation is achieved using an incident gas-phase detonation wave. The top section of the detonation tube (which includes the top two-phase modules) is filled with a stoichiometric mixture of ethylene and oxygen immediately prior to firing the fuel injectors. The fuel injectors are then fired. After a predetermined delay period, a plasma jet in the top flange is fired, which 

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