How to Ensure the Stability of Blades in Explosion-Proof, High-Temperature Fans

How to Ensure the Stability of Blades in Explosion-Proof, High-Temperature Fans

Regarding the flow characteristics of vibration dampers for explosion-proof, high-temperature fans, the resistance coefficient of the initial rotation coefficient serves as the primary indicator for comprehensively evaluating the performance of these dampers. Taking into account the uniformity of water flow and pre-rotation factors, and based on the distribution characteristics of radial and axial flow parameters, it is recommended to improve the shape by extending the length of the central blade’s cord in the grille and flow channel, thereby optimising the high stability of the straight blades and the cascade. Using computational fluid dynamics (CFD) techniques and acoustic analysis theory, the fundamental frequency noise generated by dual and sub-sources and the surface of explosion-proof, high-temperature fan blades at three different flow rates was investigated. Through CFD simulations, the three-dimensional transitional flow field of the explosion-proof, high-temperature fan can be obtained. Based on the aeroacoustic equations, the dual and sub-sources are extracted from the interior of the vortices, and the blade noise equations are employed for simulation. To enhance the realism of the computational model, a multi-zone acoustic boundary element model was employed to account for the dispersion effects in sound propagation. In the unstable flow field of the explosion-proof, high-temperature-resistant fan, pressure fluctuations on the vortex surface are primarily influenced by the fundamental frequency, whereas pressure variations within the blades do not exhibit a distinct fundamental frequency component. The vortex tongue is a significant contributor to the fundamental noise. As the flow rate of the explosion-proof, high-temperature-resistant fan increases, the noise radiated by the vortex rises sharply, whilst the fundamental frequency noise generated by the blades is smaller than that from the vortex. A new design method for explosion-proof, high-temperature-resistant fans has been proposed, particularly for high-flow conditions. Utilising the developed technology, on-site performance tests and evaluations were conducted for the aerodynamic optimisation design of the explosion-proof, high-temperature-resistant fan. It is important to note that there are issues with the numerical simulation of three-dimensional viscous flow fields. Based on this method, various prototypes were developed, resulting in significant improvements in aerodynamic and noise performance. Practice has proven this method to be correct. Using a mature system configuration, a three-dimensional simulation of the flow field within the explosion-proof, high-temperature-resistant fan was conducted to determine velocity and pressure. This analysis captured many important phenomena within the fan.