Study on the stability of small fluctuation of water level in impedance pressure regulating chamber

According to the flow characteristics of the bottom water flow when the water level of the impedance pressure regulating chamber fluctuates, the change law of impedance loss under small fluctuations is analyzed, and it is considered that it is more reasonable to consider the impedance effect in proportion to the impedance loss and the first square of the velocity. After introducing it into the basic equation for stability analysis, the stability condition and critical stability section calculation formula of the water level of the impedance pressure regulating chamber under small fluctuations are derived. The results show that selecting an appropriate impedance type can help to improve the stability of small fluctuations in the water level of the pressure regulating chamber, and the critical stability section of the corresponding pressure regulating chamber will be smaller than that of Thoma.