Open Access

ARTICLE

Numerical Simulation of Axial Inflow Characteristics and Aerodynamic Noise in a Large-Scale Adjustable-Blade Fan

Lin Wang¹, Chunguo An², Nini Wang², Yaming Ping¹, Kun Wang¹, Ming Gao^1,*, Suoying He¹

1 School of Energy and Power Engineering, Shandong University, Jinan, 250061, China
2 Shandong Electric Power Engineering Consulting Institute Co., Ltd., Jinan, 250013, China

* Corresponding Author: Ming Gao. Email:

(This article belongs to the Special Issue: High-Speed and High-Temperature Flows)

Fluid Dynamics & Materials Processing 2020, 16(3), 585-600. https://doi.org/10.32604/fdmp.2020.09611

Received 08 January 2020; Accepted 16 March 2020; Issue published 25 May 2020

Abstract

Numerical simulation are conducted to explore the characteristics of the axial inflow and related aerodynamic noise for a large-scale adjustable fan with the installation angle changing from −12° to 12°. In such a range the maximum static (gauge) pressure at the inlet changes from −2280 Pa to 382 Pa, and the minimum static pressure decreases from −3389 Pa to −8000 Pa. As for the axial intermediate flow surface, one low pressure zone is located at the junction of the suction surface and the hub, another is located at the suction surface close to the casing position. At the outlet boundary, the low pressure is negative and decreases from −1716 Pa to −4589 Pa. The sound pressure level of the inlet and outlet noise tends to increase monotonously by 11.6 dB and 7.3 dB, respectively. The acoustic energy of discrete noise is always higher than that of broadband noise regardless of whether the inlet or outlet flow surfaces are considered. The acoustic energy ratio of discrete noise at the inlet tends to increase from 0.78 to 0.93, while at the outlet it first decreases from 0.79 to 0.73 and then increases to 0.84.

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Keywords

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