Three-dimensional flow analysis and improvement of slip factor model for forward-curved blades centrifugal fan

Abstract

This work developed improved slip factor model and correction method to predict flow through impeller in forward-curved centrifugal fan. Both steady and unsteady three-dimensional CFD analyses were performed to validate the slip factor model and the correction method. The results show that the improved slip factor model presented in this paper could provide more accurate predictions for forward-curved centrifugal impeller than the other slip factor models since the present model takes into account the effect of blade curvature. The correction method is provided to predict mass-averaged absolute circumferential velocity at the exit of impeller by taking account of blockage effects induced by the large-scale backflow near the front plate and flow separation within blade passage. The comparison with CFD results also shows that the improved slip factor model coupled with the present correction method provides accurate predictions for mass-averaged absolute circumferential velocity at the exit of impeller near and above the flow rate of peak total pressure coefficient.

Application of Numerical Optimization Technique to Design of Forward-Curved Blades Centrifugal Fan

“…(1)). Guo and Kim (4) performed three-dimensional unsteady calculation using a commercial CFD code for a multi-blade fan, which is similar to the model used in this work. Due to a large number of forward curved blades in the impeller, they used 794 435 grid points, of which number is an order of magnitude larger than the number of grid points, 47 064 used in this work.…”

“…Guo and Kim (4) in their numerical simulations performed both steady and unsteady threedimensional RANS analysis for a forward-curved blades centrifugal fan, and found that, except in the vicinity of the volute tongue, the steady results with frozen rotor condition are in good agreements with unsteady results. However, unsteadiness, asymmetry and three-dimensionality of the flow make the analysis very difficult and time-consuming.…”

Optimization of sirocco fan blade to reduce noise of air purifier using a metamodel and evolutionary algorithm

“…(9), which represents the kriging metamodel, is the correlation variable h k ; h k can be calculated as shown in Eq. (11) using maximum likelihood estimation (MLE) [26].…”

“…Additionally, there have been many studies [5][6][7][8] that used design of experiments (DOE), which maximizes the information gained through minimal testing by appropriately posting test points, as well as design optimization (DO), which aims to obtain an optimum solution by combining and approximating the estimated noise in each test point. Guo and Kim [9] identified the characteristics of internal flow through numerical analysis by applying the steady and unsteady 3D Reynolds-Averaged Navier-Stokes (RANS) equations to sirocco fans. Younsi et al [10] analyzed the characteristics of the flow and noise arising from interactions between the impeller and the scroll of sirocco fans by using unsteady 3D RANS analysis.…”

Aerodynamic and aeroacoustic optimization for design of a forward-curved blades centrifugal fan

“…8 developed a mathematical model of impeller forces to reduce the computing time and storage for the calculations of three-dimensional viscous flow in a forward-curved blade centrifugal fan. Guo and Kim 9 developed an improved slip factor model and correction method to predict flow in the impeller of a forward-curved blade centrifugal fan, and demonstrated their methods through both three-dimensional steady and unsteady Navier–Stokes analyses. Hayashi et al.…”