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research-article

A Quantitative Evaluation Method for Impeller-Volute Tongue Interaction and Application to Squirrel Cage Fan with Bionic Volute Tongue

[+] Author and Article Information
Ke Wang

Department of Fluid Machinery and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049 China
niceheaven@stu.xjtu.edu.cn

Yaping Ju

Department of Fluid Machinery and Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049 China
yapingju@mail.xjtu.edu.cn

Chuhua Zhang

Department of Fluid Machinery and Engineering, School of Energy and Power Engineering, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049 China
chzhang@mail.xjtu.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4042372 History: Received July 19, 2018; Revised December 09, 2018

Abstract

The impeller-volute tongue interaction strongly influences the aerodynamic performance of squirrel cage fan. To quantitatively evaluate the level of impeller-volute tongue interaction, we propose two parameters, i.e., recirculated flow coefficient and reversed flow coefficient based on a careful inspection of flow pattern near the volute tongue of a squirrel cage fan. Inspired by the good aerodynamic characteristics of owl wing, particular effort is made to develop a bionic design of volute tongue to improve the impeller-volute tongue match. The aerodynamic erformances of both the squirrel cage fans with original volute tongue and bionic volute tongue are numerically and experimentally analyzed. The results show that, by employing the bionic design of volute tongue, the squirrel cage fan can achieve higher aerodynamic performance than that with original volute tongue. Better match between impeller and volute tongue is obtained with smaller recirculated flow coefficient and reversed flow coefficient, validating the effectiveness of the proposed parameters to quantitatively evaluate the level of impeller-volute tongue interaction. In addition, the bionic design of volute tongue is beneficial for the improvement of flow quality and for the relief of abrupt pressure variation and axial non-uniformity of flow near the volute tongue. This work is helpful for a deep understanding of complex flow pattern in squirrel cage fan.

Copyright (c) 2018 by ASME
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