G. V. R. Seshagiri Rao ¹, V. V. Subba Rao ², Ch. Prabakara Rao ³

Affiliations
1 JNTUK, Kakinada - 533003, Andhra Pradesh, IN
2 Mechanical Engineering Department, JNTUK, Kakinada - 533003, Andhra Pradesh, IN
3 Mechanical Engineering Department, Raghu Engineering College, VSP - 531161, Andhra Pradesh, IN

Abstract

Objectives: In this work Rapid prototype model is used to reduce the noise of an axial cooling fan. Methods/Analysis: Reverse engineering is considered for modeling the fan and computational fluid dynamics methods are applied to the existing fan to evaluate the noise levels. Changed the existed axial fan blade profile with NACA 63-006 airfoil to decrease noise levels. The local flow field of the fan was computed with rapid prototype model. The flow patterns throughout the fan are visualized using numerical techniques. Findings: By decreasing the no. of blades with airfoil cross section, noise is reduced and also increased fan performance. The overall sound intensity levels are observed for modified fan a series of NACA Airfoil and it has been observed that the minimum noise level of NACA 63-006 RPT fan is 60.5 dB. Novelty/ Improvement: Large broadband noise reduction is obtained due to RPT fan a NACA 63-006 airfoil profile of blade geometry.

Keywords

Axial Cooling Fan, CFD, Noise Evaluation, NACA Series, Rapid Prototyping.

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