Research Analysis on Radially Bent Flat Blades for Stainless Steel High-Temperature Fans

Research Analysis on Radially Bent Flat Blades for Stainless Steel High-Temperature FansIn industrial production, stainless steel high-temperature fans serve as indispensable critical process equipment. During operation, the blades significantly influence the actual flow within the impeller. By rationally optimizing blade profiles and blade types, the overall performance of fluid machinery such as stainless steel high-temperature fans can be effectively enhanced. Currently, numerical simulations of the internal flow field within stainless steel high-temperature fans enable more thorough investigation into the effects on the performance of radially curved blades. Based on actual simulation results, it was found that the efficiency of forward-curved blades in stainless steel high-temperature fan units is 0.4% higher than that of backward-curved blades. Analysis of the internal flow field reveals that once the inlet flow rate drops below a certain threshold, the flow state within the stainless steel high-temperature fan undergoes a drastic change, leading to rotational stall phenomena. Furthermore, vortex structures—particularly vortex cores and their adjacent vortex paths—typically exert a substantial influence on low-flow airstreams. It is well-known that the impeller constitutes the critical working component in the operation of stainless steel high-temperature fan units. When the engine rotates the propeller, the blades within it forcibly rotate the fluid. That is, the blades act upon the fluid along its direction of movement, thereby increasing the fluid's potential and kinetic energy. Under the influence of inertial forces, the fluid flows from the center of the propeller toward one end, exiting the propeller at high speed into the compression chamber, and then discharging through the diffuser. This sequence constitutes the air compression process. Within the stainless steel high-temperature fan assembly, fluid at the impeller's center gradually flows toward one end, creating a low-pressure zone at the impeller's core. When sufficient vacuum is established, fluid enters the impeller from the suction chamber at the suction side pressure. This entire sequence is termed the suction process. Due to the continuous rotation of the impeller, fluid is continuously drawn in and discharged, forming a continuous operation. Simultaneously, examining the efficiency curve of the stainless steel high-temperature fan unit reveals that forward-curved blades exhibit 0.4% higher efficiency than backward-curved blades, with both blade types showing broadly similar curve trends. This aligns with the original stainless steel high-temperature fan design.