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Effects of the Inlet Position of Blade on the Performance of a Centrifugal Impeller
Yunlong Li,Ruizi Zhang,Kaibin Wang,Jingyin Li 한국유체기계학회 2018 International journal of fluid machinery and syste Vol.11 No.3
The effects of the inlet position of blade on the performance of a centrifugal impeller are numerically investigated. The inlet position of the blade can be determined by the outer diameter, the leaning angle of the blade inlet, the shroud and hub angular momentums specified at the blade inlet. It is found that the flow fields of the optimal impeller are obviously superior to those of the impeller whose blade leading edge was installed at impeller eye. The range analyses reveal that angular momentum specified at the inlet hub is the least important factor in affecting the efficiency of impeller, while the outer diameter of blade leading edge plays the most important role in determining the pressure ratio.
Yingkun Zhang,Kunhang Li,Yunlong Li,Jingyin Li 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.1
The effects of the guiding tank on flow characteristics inside a double-suction squirrel-cage fan for the range hood were numerically investigated in this paper. Flow analysis was conducted by solving the three-dimensional steady Reynolds-averaged Navier-Stokes equations using the realizable k- turbulence model. Numerical results were validated with the experimental data for total pressure. Differences in flow characteristics between the fan model and the range hood model at the nearly maximum mass flow rate of 0.3214 kg/s were analyzed in detail. Numerical simulation results show that the incoming flow of the squirrel-cage fan will be distorted due to the guiding tank. The inlet distortion will deteriorate the aerodynamic performance of the squirrel-cage fan and cause obvious differences in the velocity field, the pressure field and the vortex structures inside the fan.
Aerodynamic Optimization of Squirrel-Cage Fan with Dual Inlet
Ruizi Zhang,Kaibin Wang,Yunlong Li,Jingyin Li 한국유체기계학회 2018 International journal of fluid machinery and syste Vol.11 No.3
In this paper, the rotor and the volute of the squirrel-cage fan with dual inlet were optimized to improve its aerodynamic performance. The blade inlet angle, blade exit angle and diameter ratio of the impeller were chosen as optimization variables using the response surface methodology (RSM) to improve the total pressure. Furthermore, another three optimization variables were adopted on the basis of previous optimum results, which are the width of impeller, the location of the impeller annular plate and the location of cutoff respectively. The simulation and experimental results show that the total pressure of the optimal model has been greatly improved without noise increase in comparison with the original model.
Aerodynamic Design and Multi-Objective Optimization of an Adjustable Blade Axial-Flow Fan
Fanjie Meng,Yingkun Zhang,Jin Xiong,Jingyin Li 한국유체기계학회 2022 International journal of fluid machinery and syste Vol.15 No.1
In this paper, the adjustable blade axial-flow fan is taken as the research object, and the primary aerodynamic design of the fan is carried out by the cascade method. Numerical calculation method is used to verify the aerodynamic performance of the preliminary design fan. The paper uses surrogate model and optimization algorithm to optimize the rotor of the preliminary design fan with a single objective, based on which the multi-objective optimization of the variable operating performance of the stator is carried out. The optimization results show that the total pressure and total pressure efficiency of the fan are significantly improved, and the bend angle and lean of the blade can improve the load distribution of the rotor and enhance the work capacity of the rotor. The optimization results for the stator reveal that there is a strong connection between the rotor and stator, and that a reasonable stator stagger angle will improve the variable operating performance of the fan.