The experimental apparatus was consisted of an explosion vessel, a gas supply system, a mist generation system, an ignition system, and a process control and data acquisition system, as shown in Fig. 8.1. The dimension of the explosion vessel is 910 mm × 150 mm × 150 mm and the design pressure is 1.50 MPa. Two tempered glasses were installed in the front and back sides of the explosion vessel for the visualization of the flame evolution process. A pair of ignition electrodes with a gap of 5 mm was set 8 cm apart from the bottom of the vessel to activate the explosion. The high-frequency data acquisition card (PCI8348AJ), with high-speed parallel analog inputs and programmable digital outputs, was adopted in the process control and data acquisition system to start the ignition and pressure acquisition in proper sequence. A 50 kHz piezoresistive pressure sensor (MDHF20) with a dynamic responding time of 1 ms was installed in the middle of the explosion vessel to acquire the pressure history. A high-speed camera (FASTCAM SA4) was used to record the flame propagation process. The frame rate and saving format (videos or photos) of the shooting process were controlled by program.