CFD GRID GENERATION AND FLOW ANALYSIS OF A COUNTER ROTATING OPEN ROTOR PROPULSION SYSTEM
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Date
2010-06
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Publisher
The Ohio State University
Abstract
Counter Rotating Open Rotor (CROR) systems promise a light weight, fuel efficient means for propulsion for the aerospace industry. The only drawback is its high level aerodynamic noise, which could be analyzed using Computational Aeroacoustic (CAA) methods such as FW-H or AIBM. However, for a better performing CAA tool, a good CFD model and flow solution is first needed. This study focuses on creating both structured and unstructured meshes for two CROR configurations, one with 12x12 blades count and the other with 12x10 count. Three unstructured CFD mesh domains, with varying domain sizes and differing boundary conditions, were solved in FLUENT for a normal sea-level take-off condition for the CROR, with a flow mach number M = 0.2, and compared to each other to see which one is a better fit for accurate flow solutions with less computation time. The results showed that the most suitable CFD model for aerodynamic noise analyses is the single passage unstructured mesh, with periodic boundary conditions and a domain breadth or radius that is about ten times larger than the mean rotor radius. Furthermore, the CFD model developed in this study is also perfectly suitable for any further CAA investigation in order to reduce noise of the CROR.
Description
UnderGraduate Research Grant
Keywords
CFD, Aeroacoustics, CROR, Open Rotor, Counter Rotating