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- W2001964094 abstract "Axial compressors for industrial application are usually assembled from a limited set of standardized stages and casings to meet the various customer specifications. The performance of the entire compressor is then often predicted by a stage stacking method where the characteristics of individual stages (“base characteristics”) are superpositioned. At MAN TURBO these “base characteristics” for a standard blade type are obtained from measurements in a test rig featuring variable stator blades. The geometry is then identical to the one used in compressors designed for fixed speed where the required operating range is obtained by the use of variable stator blades. In contrast, a variable speed already allows for a certain operating range and there is no need for variable stator blades. The fixed stator blades, however, do not include a gap between blade and casing. The question to be addressed in this paper is how this additional gap between stator blade and casing (“stator casing gap”) affects the characteristic of a single stage comprising a rotor and a stator. In order to assess this influence for a variety of geometric parameters such as stator blade settings, chord length and gap height a simple one-dimensional approach for tip leakage loss assessment was adapted and then modified in order to describe the loss mechanisms in a stator casing gap. The relevant mechanism itself and the calibration of the model were inferred from full 3D viscous flow calculations. These calculations were performed for a 8 1/2 stage test compressor, first for the true configuration, i.e., with stator casing gap, and then for a configuration without stator casing gap (as used for compressors with fixed stators). For the former case measurements of some aerodynamic parameters served as check for the CFD results. Despite some difficulties encountered during the calibration by means of CFD, the postulated correction led to a better agreement between the predicted performance by the stage stacking method and the measurements of built compressors." @default.
- W2001964094 created "2016-06-24" @default.
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- W2001964094 date "2008-01-01" @default.
- W2001964094 modified "2023-09-25" @default.
- W2001964094 title "Influence of Gap Between Casing and Variable Stator Blade on Axial Compressor Performance" @default.
- W2001964094 doi "https://doi.org/10.1115/gt2008-50301" @default.
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