Estimations of Compressor Stall and Surge Using Passage Stall Behaviors

Akhlaghi, Mitra; Azizi, Yahya; Nouri, Nourouz Mohammad

doi:10.3390/machines10080706

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…The procedures to detect stall inception in the numerical simulation have been discussed in Ref. [46].…”

Section: Compressor Characteristicsmentioning

confidence: 99%

Investigation of Vaned-Recessed Casing Treatment in a Low-Speed Axial-Flow Compressor, Part II: Unsteady Results

Akhlaghi,

Azizi

2023

Aerospace

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In this paper, unsteady characteristics of a modified vaned-recessed casing treatment with 23.2% rotor blade tip axial chord exposure were studied numerically. The modifications to the traditional vaned-recessed casing treatments were composed of geometrical amendments to the casing treatment’s guide vanes and the top of the treated casing. The solid casing and the casing treatment configurations were simulated using the Unsteady Reynolds-Averaged Navier–Stokes equations (URANS), and the results were validated by experimental results. Firstly, standard deviation and frequency analysis were performed to find the sources of unsteadiness. Secondly, velocity components analysis, including velocity triangles, was presented instantaneously to clarify their effects on rotor tip flow fields as well as stall margin improvement. Thirdly, unsteady interactions between the rotor and casing treatment flow fields, including flow structure and pressure distributions, were discussed. In the end, flow streamline patterns, in addition to the physical mechanism of the vaned-recessed casing treatment, were also discussed. The results indicated that unsteadiness plays an important role in the flow mechanism and cannot be ignored. The unsteadiness increases as the mass flow is reduced toward the stall/surge condition. Moreover, the analysis of velocity components demonstrated that the casing treatment has distinct behavior at the last operating points before the onset of the stall for solid casing and casing treatment configurations in terms of axial velocity change.

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“…The procedures to detect stall inception in the numerical simulation have been discussed in Ref. [46].…”

Section: Compressor Characteristicsmentioning

confidence: 99%

Investigation of Vaned-Recessed Casing Treatment in a Low-Speed Axial-Flow Compressor, Part II: Unsteady Results

Akhlaghi,

Azizi

2023

Aerospace

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“…More details on the detection of the onset of stall for the investigated compressor based on a new approach and using secondary flow total energy and spectral entropy can be found in Akhlaghi [20].…”

Section: Stall Detectionmentioning

confidence: 99%

Investigation of Vaned-Recessed Casing Treatment in a Low-Speed Axial Flow Compressor, Part I: Time-Averaged Results

Akhlaghi,

Azizi

2023

Aerospace

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This paper investigates the effects of two modifications to a vaned recessed casing treatment. First, the shape of a circular curve was used in the top of the treated casing. Second, a fully curved guide vane was also applied. The goals of the modifications are to enhance the flow recirculation as well as to relieve the low-speed flow, which is normally accumulated within the corners of the vaned recessed casing treatment. The solid casing in addition to the two vaned recessed configurations with 23.2% and 53.5% rotor blade tip axial chord exposure have been studied numerically. The results indicated that two mechanisms are involved in the stall margin enhancement. First, the circumferential pressure gradient is reduced for both configurations. The reduction in pressure gradient largely reduces the development of tip leakage vortex and, thus, the generation of low-speed fluid is diminished. Second, the main flow/tip leakage interface moves toward downstream and the movement of interface toward the leading edge is delayed. The second configuration with a greater rotor blade tip exposure enables extra flow recirculation due to decreasing surface area and, therefore, could be superior to the application of the first casing treatment configuration. The major streamlines within the casing treatment are also discussed. The time-averaged results are presented in this paper, while the unsteady results including instantaneous flow fields, origins of the unsteadiness and frequency analysis are discussed in part II.

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“…In addition, if the dirt contains corrosive elements, it may cause high-temperature corrosion in the combustion chamber and turbine parts. When the cleaning effect is not ideal, the presence of dirt will affect the clearance space between the blades during the operation of the unit, change the airflow velocity streamline between the blades, and even cause rotation stall [15][16][17][18] . Therefore, it is particularly important to use efficient intake filters and water washing techniques to keep the compressor clean [19,20] .…”

Section: Introductionmentioning

confidence: 99%

Experimental research on water washing process of gas turbine blades

Chen,

Jia,

Liu

et al. 2024

Fourth International Conference on Mechanical Engineering, Intelligent Manufacturing, and Automation Technology (MEMAT 2023)

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As the core component of the compressor, the gas turbine blade is prone to oil accumulation, salt accumulation and scale under harsh working conditions, resulting in blade wear, bending and other faults. In order to ensure the normal operation of the gas turbine, regular daily cleaning is essential. In this paper, aiming at the problem of abnormal bending of the top of the second stage rotor blades of the compressor, starting from the water washing process and water washing effect of the compressor blade, the dirty blade in line with the actual working conditions is constructed, and the single blade offline water washing test bench is designed and built. After determining the ratio of the washing medium, the surface of the blade is washed by the nozzle. Finally, the quantitative evaluation of the washing effect shows that high temperature and detergent can significantly improve the off-line washing effect of gas turbine blades, and the conical jet nozzle has more advantages in the process of off-line washing.

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Estimations of Compressor Stall and Surge Using Passage Stall Behaviors

Cited by 5 publications

References 24 publications

Investigation of Vaned-Recessed Casing Treatment in a Low-Speed Axial-Flow Compressor, Part II: Unsteady Results

Investigation of Vaned-Recessed Casing Treatment in a Low-Speed Axial-Flow Compressor, Part II: Unsteady Results

Investigation of Vaned-Recessed Casing Treatment in a Low-Speed Axial Flow Compressor, Part I: Time-Averaged Results

Experimental research on water washing process of gas turbine blades

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