The development and requirements of a body force database from two-dimensional and streamline curvature calculations

Abstract

This thesis presents a methodology for development of a body force database, from design conditions to flows below the stall point, for compressor stability analysis. The methodology is based on two-dimensional blade element calculations and a streamline curvature procedure to calculate the axisymmetric flow, although it can be extended to use three-dimensional calculations where available. The methodology is demonstrated by assembling the body force database and using it for a stability calculation. The connection between the stall onset behavior and the body forces near and below the stall point is established through a sensitivity assessment of the radial and axial distribution of the body forces. Comparisons are made with stall onset data obtained in a single stage axial compressor. Capturing the axial component of the body force is found to be key element in estimation of the stall point and stall inception type.