Body-force and mean-line models for the generation of axial compressor sub-idle characteristics

Righi, Mauro; Ferrer-Vidal, Luis E.; Pachidis, Vassilios

doi:10.1017/aer.2020.58

Cited by 7 publications

(7 citation statements)

References 14 publications

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“…Further discussion on the use of this model within an Euler code and its implementation in modeling sub-idle characteristics can be found in Ref. [35]. As seen for this specific geometry, the implementation of the blade model in a mean-line approach differs only slightly from the spanwise application of the same model in ACRoSS.…”

Section: Resultsmentioning

confidence: 99%

A Loss and Deflection Model for Compressor Blading at High Negative Incidence

Ferrer-Vidal

Schneider

Allegretti

et al. 2019

Journal of Turbomachinery

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While significant advances have come about for turbomachinery off-design performance characterization using computational fluid dynamics (CFD), the need for quick performance estimates at challenging off-design conditions still requires the use of lower-order models, such as mean-line analyses and through-flow tools. These inviscid tools require blade performance correlations formulated in terms of loss and turning angle as a function of blade geometric and aerodynamic parameters. Traditionally, such correlations have relied on the empirical data from blade cascade tests at nominal incidence conditions. This limitation on the applicability of the blade correlations has caused performance modeling of the sub-idle regime to be off-limits to this type of correlation-based approaches. This paper addresses the development of blade loss and deviation models applicable to the sub-idle regime using a parametric numerical approach. 2D CFD results are used to generate a model that is then applied to mean-line and through-flow analyses aimed at predicting the sub-idle map of an axial flow compressor. The model proves to be a valuable tool for quick sub-idle performance estimates and allows existing correlation-based performance prediction methods to be extended into the sub-idle regime.

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Section: Resultsmentioning

confidence: 99%

A Loss and Deflection Model for Compressor Blading at High Negative Incidence

Ferrer-Vidal

Schneider

Allegretti

et al. 2019

Journal of Turbomachinery

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“…This then provides at least a mathematically consistent way of establishing the coordinates along which interpolation will take place in this area of the map. The resulting interpolated characteristics may then be “chopped” in the stall region in accordance with a consistent stability line definition (such as peak PR) or by a more sophisticated method for determining the stall drop-in point 29,30 Figure 4. shows the stall region of the map where the use of this smoothing spline may be required to join peak pressure points to the zero flow condition.…”

Section: Map Generation Methodsmentioning

confidence: 99%

Generating axial compressor maps to zero speed

Ferrer-Vidal

Pachidis

Tunstall

2020

Proceedings of the Institution of Mechanical Engineers, Part A:

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Gas turbine performance models typically rely on component maps to characterize engine component performance throughout the operational regime. For the sub-idle case, the lack of reliable rig test data or inability to run design codes far from design conditions entails that component maps have to be generated from the extrapolation of existing data at higher speeds. This undermines the accuracy of whole-engine sub-idle performance models, at times impacting engine development and certification of aviation engines and the accuracy of start-up performance prediction in industrial gas turbines. One of the main components driving this issue is the core compression system, which can present operability concerns during light-up and which also sets the combustor airflow required for ignition. This paper presents, discusses, and draws on previous approaches to describe a method enabling the creation of sub-idle compressor maps from analytical and physical grounds. The method relies on the calculation of zero-speed and torque-free lines to generate a map down to zero speed along with analytical interpolation. A method for the interpolation process is described. A sensitivity study is carried out to assess the effects that different elements of the map generation process may have on the accuracy of the resulting performance calculation. Overall, a method for the generation of accurate, consistent maps from limited geometry data is identified.

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“…A detailed description of the flow topology at free windmill is given by Courty-Audren et al [38]. An interesting update of loss correlations at high negative incidence has recently been published [39,40] and could be useful in future work to improve this point. However, it should be underlined that the hypotheses behind the body force approach are particularly challenged, since the flow structures observed from URANS exhibit high gradients in the blade-to-blade direction, involving smaller length scales than for the compressor-like operating point.…”

Section: Free Windmilling Operating Pointmentioning

confidence: 99%

Improvement of the Parallel Compressor Model and Application to Inlet Flow Distortion

Bénichou

Binder

Bousquet

et al. 2021

IJTPP

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This paper introduces a semi-analytical approach which enables one to deal with distorted inflow in axial fans or compressors. It is inspired by the classical parallel compressor (PC) theory but relies on a local flow-loading coefficient formalism. It is applied to non-uniform flow conditions to study the aerodynamic behavior of a low-speed fan in response to upstream flow distortion. Experimental measurements and 3D RANS simulations are used to evaluate the prediction of fan performance obtained with the local PC method. The comparison proves that, despite its simplicity, the present approach enables to correctly capture first order phenomena, offering interesting perspectives for an early design phase if different fan geometries are to be tested and if the upstream distortion maps are available.

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Body-force and mean-line models for the generation of axial compressor sub-idle characteristics

Cited by 7 publications

References 14 publications

A Loss and Deflection Model for Compressor Blading at High Negative Incidence

A Loss and Deflection Model for Compressor Blading at High Negative Incidence

Generating axial compressor maps to zero speed

Improvement of the Parallel Compressor Model and Application to Inlet Flow Distortion

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