Resistance characteristics of labyrinth throttle based on central composite design

[Background] Labyrinth throttle can greatly reduce pressure in a short distance and reduce fluid noise and vibration, hence is widely used in engineering fields such as nuclear power to control and adjust the flow, pressure and velocity of coolant fluid, ensuring the safety and stability of nuclear power plant system. Because the thermal hydraulic parameters of the reactor are often adjusted during design and operation, the pressure drop required to be achieved through the labyrinth throttle will also be adjusted. The local resistance coefficient of labyrinth throttle is determined by many factors, including the number of baffles ( n ), the distance between baffles ( d ) and the ratio of