Effects of the Second-Stage of Rotor with Single Abnormal Blade Angle on Rotating Stall of a Two-Stage Variable Pitch Axial Fan

Lei Zhang, Liang Zhang, Qian Zhang, Kuan Jiang, Yuan Tie and Songling Wang
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Lei Zhang: School of Energy, Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China
Liang Zhang: School of Energy, Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China
Qian Zhang: School of Energy, Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China
Kuan Jiang: School of Energy, Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China
Yuan Tie: School of Energy, Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China
Songling Wang: School of Energy, Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China

Energies, 2018, vol. 11, issue 12, 1-18

Abstract: It is of great value to study the impact of abnormal blade installation angle on the inducement mechanism of rotating stall to achieve the active control of rotating stall in an axial fan. Based on throttle value function and SST k-ω turbulence model, numerical simulations of the unsteady flow process in stall condition of an axial flow fan with adjustable vanes were carried out, and the influence mechanism of abnormal stagger angle of a single blade in the second stage rotor on induced position and type of stall inception and evolution process of rotating stall were analyzed. The results show that compared with synchronous adjustment of blade angle, the blade with abnormal stagger angle will cause the increase of flow rate at the beginning of stall and make the fan fall into an unstable condition in advance. The existence of blade with abnormal angle does not cause the change of the induced position and type of stall inception and the inducement mechanism of rotating stall, which are the same as the axial fan with normal blade angle. Moreover, the single blade with abnormal deviation angle has important impacts on the 3D unsteady evolution process from stall inception to stall cell formation in two rotors.

Keywords: two-stage axial fan; numerical simulation; abnormal blade installation angle; rotating stall (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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