Methods for obtaining and using generalized models for full and elementary stages and airfoil cascades of RW, GV and NGV in the design of compressors and turbines

Abstract

Methods of obtaining and using the Smith diagrams are considered not only for complete, but also for elementary stages and airfoil cascades of RW, GV and NGV compressors and turbines. It is shown that in this case, in the Smith diagrams for each stage points can be determined not only for the average section "av", but also for the end section "k" and the sleeve section "w". To obtain the Smith diagrams not only for complete, but also for elementary stages and cascades, the development of the methods by G.A. Bykov [1], L.E. Olshtein [2], A. Howell [3], as well as 3D CAD/CAE modeling (in AnsysCFX) are proposed. Additionally, it is proposed to use the results of the airfoil cascades purges of A.I. Bunimovich, A.A. Svyatogorov [4] and Emery (NASA). When using such Smith diagrams in the first approximation (for the uniform distribution of works and axial speeds along the height of the IF), taking into account the diametral dimensions (at selected Dk and d ), the position of the points "k" (for the end section), "av" (for the mass average section), and "w" (for the sleeve section), as well as the efficiency values in these sections are determined on the selected parabolas. In the next phase, adjustment is performed taking into account the conditions of radial equilibrium. Thus, the optimal change in the work along the height of the IF and the optimal scheme of the IF compressors and turbines are determined. doi 10.54708/19926502_2024_28310591