Performance Predicting Modeling of Axial-Flow Compressor at Design and Off-Design Conditions

Abstract

Axial flow compressor is one of the most important parts of gas turbine units. Therefore, its design and performance prediction are very important. One-dimensional modeling is a simple, fast and accurate method for performance prediction of any type of compressors with different geometries. In this approach, inlet flow conditions and compressor geometry are known and by considering various compressor losses, velocity triangles at rotor, and stator inlets and outlets are determined, and then compressor performance characteristics are predicted. Numerous models have been developed theoretically and experimentally for estimating various types of compressor losses. In present work, performance characteristics of the axial-flow compressor are predicted based on one-dimensional modeling approach. In this work, models of Lieblein, Koch-Smith, Herrig, Johnsen-Bullock, Pollard-Gostelow, Aungier, Hunter-Cumpsty Reneau are implemented to consider compressor losses, incidence angles, deviation angles, stall and surge conditions. The model results are compared with experimental data to validate the model. This model can be used for various types of single stage axial-flow compressors with different geometries, as well as multistage axial-flow compressors.

A Novel Method for Developing Compressor’s Characteristic Curves Due to the Guide Vane Stagger Angle Variation

“…Taking advantage of equations (1) and (4), as well as mathematical rules; the changing process of coefficients of pressure and flow compared to stagger angle variations (directly equal to variations in inlet flow angle α1) would be presented as equations (5) and (6), through discretization:…”

“…where "1" means values before curve displacement and "2" means values after displacement of diagram curve. Values of α in both relationships (5) and (6) are absolute inlet flow angle.…”

“…Such models are very effective in real-world control systems and are being used in power and electricity generation plants [1][2][3][4]. Air compressor as one of the main components of gas turbines has to be modeled in one-dimensional form, while gas turbine is being modeled as one-dimensional [5]. One of the appropriate methods of onedimensional modeling of an axial flow compressor is using characteristic curves of each stage.…”

Performance prediction of transonic axial multistage compressor based on one-dimensional meanline method

“…At speeds near 100% Nd(100% design speed), Koch's model does not produce the desired results. 13,14 At speeds lower than 85%Nd(85% design speed), the flow profile typically becomes extremely distorted that the Aungier's model with inviscid through-flow analysis maybe a little pessimistic. 10 The deviation angle model also has some disputes.…”

Algorithm development for aerodynamic preliminary design of multi-stage axial compressors

“…This is for the generation of the required geometrical inputs of the abovementioned simulators by the APD block. There are many publications available on the developed meanline and streamline simulators [13,14] or the CFD application in the compressor simulation [15,16], but small attention has been paid to the development of the compressor design modules. However, two research works [17,18] have evaluated the e ects of some parameters such as solidity, blade angles, or chord on the performance of a single-stage compressor and have optimized these parameters through the meanline method.…”