Square-wave pressure generator using a novel rotating valve

To generate dynamic pressure precisely at low- and medium-pressure levels a nd in a low-frequency range, we have developed a square-wave pressure gener ator using a novel rotating valve. The main features of the valve are chamb ers in the rotor and grooves inside the stator. Pressurized air from two so urces is continuously supplied to each chamber through the grooves. The val ve switches the pressure alternately by its rotation, producing square-wave pressure. The amplitude and fundamental frequency of the generated pressur e can be changed arbitrarily. The measured waveform is a periodic well-shap ed square wave. The experimental results show that the repeatability of the system is good for a dynamic pressure source.