NDLI: Automated Calibration of Compressor Loss and Deviation Correlations

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Schnoes, Markus Nicke, Eberhard
Copyright Year	2015
Abstract	Throughout preliminary design of multistage axial compressors performance prediction is based on fast 2D throughflow codes incorporating models for loss, deviation and secondary flow effects. To achieve high solution quality these models have to be calibrated on experimental or simulation data. Particularly 2D cascade loss and deviation correlations are of major importance. Correlations available in literature are mostly based on data from early cascade wind tunnel tests of NACA-65 and DCA profile families. In general, calibrations for state-of-the-art airfoil shapes are not published. This paper describes a methodology to re-calibrate parameters of well-known empirical loss and deviation correlations to CFD simulations of compressor cascades. Correlations describing choke incidence, on- and off-design loss and deviation are presented, resolving dependencies on inlet flow angle, Mach number, Reynolds number and MVDR. Based on a set of loss and deviation polars, nonlinear least-squares problems are solved to determine the empirical parameters. By including shock losses and choking incidence, the model is suited for subsonic as well as supersonic inlet conditions. Results of the calibration process are shown for two state-of-the-art compressor cascades. The overall model is evaluated on a sub- and a transonic compressor as well as on a transonic fan comparing throughflow results with 3D CFD and experimental data. A high level of automation makes the methodology applicable to arbitrary profile families or in combination with programs for parametric airfoil design.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791856635
DOI	10.1115/GT2015-42644
Volume Number	Volume 2A: Turbomachinery
Conference Proceedings	ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2015-06-15
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Computational fluid dynamics Wind tunnels Cascades (fluid dynamics) Reynolds number Airfoils Compressors Calibration Flow (dynamics) Design Simulation Shapes Shock (mechanics) Mach number
Content Type	Text
Resource Type	Article

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