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    Compressor stall warning using nonlinear feature extraction algorithms
    4.
    发明授权
    Compressor stall warning using nonlinear feature extraction algorithms 有权

    公开(公告)号：US11415139B2

    公开(公告)日：2022-08-16

    申请号：US16918054

    申请日：2020-07-01

    Applicant: Purdue Research Foundation

    Inventor： Nicole Leanne Key ,  Fangyuan Lou

    IPC: F04D27/00

    Abstract: The present disclosure relates to a novel method to detect an imminent compressor stall by using nonlinear feature extraction algorithms. The present disclosure focuses on the small nonlinear disturbances prior to deep surge and introduces a novel approach to identify these disturbances using nonlinear feature extraction algorithms including phase-reconstruction of time-serial signals and evaluation of a parameter called approximate entropy. The technique is applied to stall data sets from a high-speed centrifugal compressor that unexpectedly entered rotating stall during a speed transient and a multi-stage axial compressor with both modal- and spike-type stall inception. In both cases, nonlinear disturbances appear, in terms of spikes in approximate entropy, prior to surge. The presence of these pre-surge spikes indicates imminent compressor stall.

    PROBE PLACEMENT OPTIMIZATION IN GAS TURBINE ENGINES
    5.
    发明申请
    PROBE PLACEMENT OPTIMIZATION IN GAS TURBINE ENGINES 有权

    公开(公告)号：US20220065126A1

    公开(公告)日：2022-03-03

    申请号：US17461753

    申请日：2021-08-30

    Applicant: Purdue Research Foundation

    Inventor： Fangyuan Lou ,  Nicole Leanne Key

    IPC: F01D21/00

    Abstract: A method of optimizing probe placement in a turbomachine is disclosed which includes determining wavenumber (Wn) of N dominant wavelets generated by upstream and downstream stators and blade row interactions formed around an annulus, establishing a design matrix A utilized in developing flow properties around the annulus having a dimension of m×(2N+1), iteratively modifying probe positions placed around the annulus and determining a condition number of the design matrix A for each set of probe positions until a predetermined threshold is achieved for the condition number representing optimal probe position, wherein the condition number is defined as norm A·norm A+, wherein A+ represents inverse of A for a square matrix and a Moore-Penrose pseudoinverse of A for a rectangular matrix.

    COMPRESSOR STALL WARNING USING NONLINEAR FEATURE EXTRACTION ALGORITHMS
    6.
    发明申请
    COMPRESSOR STALL WARNING USING NONLINEAR FEATURE EXTRACTION ALGORITHMS 有权

    公开(公告)号：US20220018352A1

    公开(公告)日：2022-01-20

    申请号：US16918054

    申请日：2020-07-01

    Applicant: Purdue Research Foundation

    Inventor： Nicole Leanne Key ,  Fangyuan Lou

    IPC: F04D27/00

    Abstract: The present disclosure relates to a novel method to detect an imminent compressor stall by using nonlinear feature extraction algorithms. The present disclosure focuses on the small nonlinear disturbances prior to deep surge and introduces a novel approach to identify these disturbances using nonlinear feature extraction algorithms including phase-reconstruction of time-serial signals and evaluation of a parameter called approximate entropy. The technique is applied to stall data sets from a high-speed centrifugal compressor that unexpectedly entered rotating stall during a speed transient and a multi-stage axial compressor with both modal- and spike-type stall inception. In both cases, nonlinear disturbances appear, in terms of spikes in approximate entropy, prior to surge. The presence of these pre-surge spikes indicates imminent compressor stall.

    Probe placement optimization in gas turbine engines
    9.
    发明授权
    Probe placement optimization in gas turbine engines 有权

    公开(公告)号：US11634999B2

    公开(公告)日：2023-04-25

    申请号：US17461753

    申请日：2021-08-30

    Applicant: Purdue Research Foundation

    Inventor： Fangyuan Lou ,  Nicole Leanne Key

    IPC: F04D27/00 ,  F01D21/00 ,  G06F30/28

    Abstract: A method of optimizing probe placement in a turbomachine is disclosed which includes determining wavenumber (Wn) of N dominant wavelets generated by upstream and downstream stators and blade row interactions formed around an annulus, establishing a design matrix A utilized in developing flow properties around the annulus having a dimension of m×(2N+1), iteratively modifying probe positions placed around the annulus and determining a condition number of the design matrix A for each set of probe positions until a predetermined threshold is achieved for the condition number representing optimal probe position, wherein the condition number is defined as norm A·norm A+, wherein A+ represents inverse of A for a square matrix and a Moore-Penrose pseudoinverse of A for a rectangular matrix.

    METHOD FOR RECONSTRUCTING NON-UNIFORM CIRCUMFERENTIAL FLOW IN GAS TURBINE ENGINES
    10.
    发明申请
    METHOD FOR RECONSTRUCTING NON-UNIFORM CIRCUMFERENTIAL FLOW IN GAS TURBINE ENGINES 有权

    公开(公告)号：US20220065127A1

    公开(公告)日：2022-03-03

    申请号：US17461775

    申请日：2021-08-30

    Applicant: Purdue Research Foundation

    Inventor： Fangyuan Lou ,  Nicole Leanne Key

    IPC: F01D21/00

    Abstract: A method for reconstructing nonuniform circumferential flow in a turbomachine is disclosed which includes receiving one or more wavenumbers of interest, receiving positional information for a plurality of circumferential positions of a plurality of instrumentation probes, receiving signals from the plurality of instrumentation probes to generate a spatially under-sampled data, and from the spatially under-sampled data determining a multi-wavelet approximation reconstructing circumferential flow field.

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