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  • 1.
    Jöcker, Markus
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Kessar, Alexandros
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Fransson, Torsten H.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    Kah, G.
    Rehder, H. J.
    Comparison of models to predict low engine order excitation in a high pressure turbine stage2006In: Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines / [ed] Hall, KC; Kielb, RE; Thomas, JP, 2006, p. 145-159Conference paper (Refereed)
    Abstract [en]

    The paper compares three numerical strategies to predict the aerodynamic rotor excitation sources of "Low Engine Order" (LEO) in a high-pressure turbine stage. Main focus is laid on methods to compute the stator exit flow. The aim is to evaluate computationally cheap approaches to avoid modeling the whole circumference of the stator. A single passage viscous strategy, a single passage inviscid linear blade movement strategy, and a viscous multi-passage sector strategy are compared and evaluated. The assessment of the prediction quality is made by comparison of the computed stator exit flow to experimental data. The main result is that only the global behavior of the stator exit flow is estimated right, both the level and amplitude of Mach number and pressure are computed with poor agreement to experiments. Future evaluations of the resulting rotor excitation pressure are needed to estimate the level of necessary agreement to give acceptable predictions of the low engine order forced response.

  • 2.
    Kessar, Alexandros
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology.
    L2F measurements for low engine order excitations in a high pressure turbine stage2005Licentiate thesis, monograph (Other scientific)
  • 3.
    Kessar, Alexandros
    et al.
    KTH.
    Jöcker, Markus
    KTH.
    Fransson, Torsten
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Rehder, Hans Jürgen
    Kost, Friedrich H.
    Flow Measurements for Low Engine order Excitations in a High Pressure Turbine stage2005Conference paper (Refereed)
    Abstract [en]

    This paper demonstrates and evaluates unique flow measurement results obtained in a high pressure test turbine, in order to analyze the effect of Low Engine Order (LEO) excitations. A stator was modified to induce LEO flow variations by either imposing a throat width variation or a blockage of the trailing edge cooling flow from some of the vanes. Laser Two Focus (L2F) and pressure probe measurements were performed at subsonic and transonic flow conditions, without and with the rotor installed and operated. Time resolved velocity data was obtained in front and inside of rotor passages covering the Low Engine Order variation period. The presented results evaluation focuses only on L2F measurements and show that the LEO variation of flow velocity and turbulence intensity is most visible in the gap between stator and rotor and at the first measurement location inside the rotor passage. The overall trend is that stator exit flow Mach numbers are higher behind the passages with smaller pitch and vice versa.

  • 4.
    Salomon Popa, Marianne
    et al.
    KTH, Superseded Departments, Energy Technology.
    Fridh, Jens
    KTH, Superseded Departments, Energy Technology.
    Kessar, Alexandros
    KTH, Superseded Departments, Energy Technology.
    Fransson, Torsten
    KTH, Superseded Departments, Energy Technology.
    Gas turbine simulations in the computerized educational program CompEduHPT: Educational aspects2003In: American Society of Mechanical Engineers, International Gas Turbine Institute, Turbo Expo (Publication) IGTI, 2003, Vol. 1, p. 733-739Conference paper (Refereed)
    Abstract [en]

    An overview of computerized educational program (CompEduHPT) which includes several simulations was presented. These simulations provide an alternative way to learn, based on discovery and experience. All the simulations were preceded with theory chapters, quizzes and preparatory tasks to enable fruitful exercises to be designed. Evaluations show that a computerized program including multiple ways of learning provides considerable support to the conventional student-teacher way of learning.

  • 5.
    Salomon Popa, Marianne
    et al.
    KTH, Superseded Departments, Energy Technology.
    Fridh, Jens
    KTH, Superseded Departments, Energy Technology.
    Kessar, Alexandros
    KTH, Superseded Departments, Energy Technology.
    Fransson, Torsten
    KTH, Superseded Departments, Energy Technology.
    Gas turbine simulations in the computerized educational program CompEduHPT: Three case studies2003In: American Society of Mechanical Engineers, International Gas Turbine Institute, Turbo Expo (Publication) IGTI, 2003, Vol. 1, p. 741-748Conference paper (Refereed)
    Abstract [en]

    An overview of the Computerized Educational Program (CompEduHPT) which includes different simulations was presented. These simulations give the students an outlook of the different parameters that affect the performance based on the ideal and real approach of gas turbine calculations. The simulations show the students the different aspects, effects and results when a calculation is made considering a mixture of two ideal gases. They also show the improvements in the performance of the gas turbine depending on the various options available.

  • 6.
    Salomon Popa, Marianne
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Fridh, Jens
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Kessar, Alexandros
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Fransson, Torsten
    KTH, School of Industrial Engineering and Management (ITM), Energy Technology, Heat and Power Technology.
    Gas Turbine Simulations in the Computerized Educational Program CompEduHPT: Three Case Studies2005In: Journal of engineering for gas turbines and power, ISSN 0742-4795, E-ISSN 1528-8919Article in journal (Refereed)
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