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@PHDTHESIS{Waniczek:565874,
      author       = {Waniczek, Phillip},
      othercontributors = {Jeschke, Peter and Steffens, Klaus},
      title        = {{I}nstationäre {S}trömung und {B}etriebsverhalten eines
                      mehrstufigen {T}riebwerk-{H}ochdruckverdichters beim
                      {P}umpen},
      school       = {RWTH Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {Shaker Verlag},
      reportid     = {RWTH-2016-00177},
      isbn         = {978-3-8440-4159-0},
      series       = {Berichte aus der Strömungstechnik},
      pages        = {VII, 165 Seiten : Illustrationen, Diagramme},
      year         = {2015},
      note         = {Druckausgabe: 2015. - Auch veröffentlicht auf dem
                      Publikationsserver der RWTH Aachen University 2016;
                      Dissertation, RWTH Aachen, 2015},
      abstract     = {In a joint research and development project between MTU
                      Aero Engines company and the Institute of Jet Propulsion and
                      Turbomachinery of Aachen University the unsteady flow during
                      surge was analysed based on experimental results. For this
                      purpose the institute developed and manufactured a new
                      design of probe that allows a transientmeasurement of the
                      2-dimensional velocity vector independent of the angle of
                      attack to the probe. For temperature measurements a fast
                      thermocouple was integrated in the probe head for the first
                      time. With this probe type the high dynamic process of surge
                      was investigated in an axial compressor. The chosen
                      compressor represents the design of modern jet engine high
                      pressure compressors. The new probes were positioned in
                      front and downstream of the first stage rotor of this
                      8-stage axial compressor. With this experimental set-up
                      surge experiments were conducted for various speeds. In
                      addition to the probe measurements unsteady wall pressure
                      signals of all stages as well as blade vibration data could
                      be included in the analysis.The experimental results provide
                      a detailed understanding of the flow pattern in all phases
                      of the surge cycle. This also includes the short periods of
                      the surge cycle (flow separation and flow acceleration). In
                      the phase of flow separation a deceleration of the flow down
                      to axial velocities (mass flow) of zero could be shown
                      (shut-off-point). Afterwards reverse flow starts which shows
                      quasi-steady state conditions in terms of flow angle and
                      Mach numbers. In this reverse flow phase the fluid enters
                      the rotor almost perpendicular to the trailing edge.
                      Temperature measurements show that the rotor still adds
                      energy to the fluid. Since the compressor efficiency is very
                      low during this phase the main portion of the energy is
                      transferred into heat. The acceleration of the flow occurs
                      on the basis of an abrupt static pressure difference between
                      the rotor leading and trailing edge. The pressure difference
                      leads to an acceleration of the flow in the axial direction
                      and hence the flow separation vanishes. The variation of
                      speed confirms the transition from classic surge to deep
                      surge when speed is increased.},
      cin          = {413510},
      ddc          = {620},
      cid          = {$I:(DE-82)413510_20140620$},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hbz:82-rwth-2016-001774},
      url          = {https://publications.rwth-aachen.de/record/565874},
}