On some Features of the Use of High-Speed Conical Valve for the Incident Shock Wave Formation in Shock Tubes
This article describes some features of the use of a high-speed electric pneumatic valve in the hypersonic aerodynamic shock tube (HAST) capable of generating well-formed incident shock waves. The use of this device is due to the requirements for the implementation of automation processes and good repeatability of the initial gas-dynamic parameters of experiments, for which conventional methods of diaphragm rupture are not suitable. The valve performs reliable operation in a wide pressure range at the driver section of shock tube; there is no need to adjust it and for setting it from run to run. Shock waves with a Mach number of up to 3 were generated in air at a pressure of 1 mbar. One of the features of the valve is to provide a good level of flow around the device separating the sections of the shock tube, which helps to optimize the efficiency of the installation and automate the experiment procedure. The results of the comparison of the data obtained in experiments conducted using diaphragm and the valve are given. It is shown that the device is capable of generating a well-formed incident shock wave in the shock tube.