Introduction to the Working Principle of a 200 kW High-Pressure Centrifugal Fan

Introduction to the Working Principle of a 200 kW High-Pressure Centrifugal Fan

A 200 kW high-pressure centrifugal fan operates on the principle of converting kinetic energy into potential energy. It accelerates gas through a high-speed rotating impeller, then decelerates and alters its flow direction to transform kinetic energy into potential energy (pressure). In a single-stage 200 kW high-pressure centrifugal fan, gas enters the impeller axially. As it passes through the impeller, it becomes radial and enters the diffuser. Within the diffuser, the gas flow direction changes, the cross-sectional area of the duct increases, and the gas flow slows down, converting kinetic energy into pressure energy. Pressure rise primarily occurs on the propeller, after which the diffusion process continues. For multi-stage 200 kW high-pressure centrifugal fans, a counterflow device directs air into the next impeller, enabling higher pressure generation. The 200 kW high-pressure centrifugal fan is fundamentally a variable-flow, constant-pressure device. At a given speed, its theoretical pressure-flow curve becomes linear; the actual characteristic curve curves due to internal losses. The pressure generated by the 200 kW high-pressure centrifugal fan is significantly influenced by changes in the temperature and density of the intake air. For a specified intake air volume, the resulting pressure will be lower at lower ambient temperatures (where air density decreases). For a given pressure-flow characteristic curve, there exists a corresponding power-flow characteristic curve. When the 200 kW high-pressure centrifugal fan operates at a fixed speed, the required power increases as the intake air temperature decreases at a constant flow rate.