Computational analysis of high-speed axial fan cascade flows

Rozerrio E. Camel, Purdue University

Abstract

It is apparent that all fluid flows behave in a transient manner, particularly with fluid flows across turbomachinery blade rows. In a turbofan engine, the transient flow behavior across the fan blades is a primary impetus for the generation of work done by the system so that successful operation is achieved by the engine [7]. The current methods in determining whether the flow is steady or transient around the fan at each operating condition for industrial applications are efficient because they reduce complexities and satisfy the need for quick, economical solutions. These methods however are more likely to depict an incomplete perspective of the flow physics around the fan, since the flow field is always transient at all engine operating conditions, even for cases where the flow field is classified as steady-state. A proposed solution is to develop a strategy that presents a realistic scope of transient flow effects across fan blades in a turbofan engine. The objective in the present research is to investigate the transient flow behavior around an isolated fan stage when the turbofan engine operates from choked to stall conditions at three representative near-tip blade speeds. Finally, the research serves to establish a classification of flow behavior ranging from a small degree to a substantial degree of unsteadiness with respect to the overall performance of a turbofan engine.

Degree

M.S.M.E.

Advisors

Merkle, Purdue University.

Subject Area

Mechanical engineering

Off-Campus Purdue Users:
To access this dissertation, please log in to our
proxy server
.

Share

COinS