Abstract
An optimized bellmouth shape of gas turbine casing with inlet reynolds number 50000 has been studied by using Computational Fluid Dynamics (CFD) procedure. The three dimensional governing equations of continuity, momentum in steady state and compressible condition are solved. Design variables for bellmouth shape optimization are inner radius, outer radius, height, and angle. From full factorial 81 case study, the fitted objective functions about reducing pressure drop and increasing uniformity in vane were found. The response surface for objective functions is introduced based on the relationship between 4 types of design variables. An increase of bellmouth inner diameter causes smaller pressure drop and low uniformity. By overlaid contour method, optimized shape of a bellmouth in gas turbine casing is introduced. Detailed results and discussions are quantitatively summarized.
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