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@PHDTHESIS{Stadermann:804290,
      author       = {Stadermann, Max},
      othercontributors = {Pischinger, Stefan and Wirsum, Manfred},
      title        = {{A}nalyse und {M}odellierung zweiflutiger {T}urbinen unter
                      {B}erücksichtigung der {W}astegateströmung},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      reportid     = {RWTH-2020-10177},
      pages        = {1 Online-Ressource (3, xi, 99 Seiten) : Illustrationen,
                      Diagramme},
      year         = {2020},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University; Dissertation, Rheinisch-Westfälische Technische
                      Hochschule Aachen, 2020},
      abstract     = {This work investigates the interaction of the turbine
                      bypass (wastegate) with the turbine wheel and the combustion
                      engine. A particular focus is on a extended modelling for
                      the 1D engine process simulation of the double entry turbine
                      under consideration of the wastegate behavior during unequal
                      admission (unequal inlet pressure in the two scrolls).Due to
                      the high complexity of the double entry turbine the
                      wastegate is initially being investigated for a single entry
                      turbine. The results can be summarized as follows: • For
                      the quantification of the flow behavior of the wastegate
                      independence of the wastegate angle and the adjacent
                      pressure ratio, two methods were examined. Measurements with
                      blocked turbine volute, where only the wastegate is
                      admitted. Measurements with a complete turbine stage, where
                      the waste gate mass flow is measured as the difference
                      between the impeller and the total mass flow. With closed
                      Wastegate, the impeller mass flow corresponds to the total
                      mass flow. Both methods lead to comparable results. • The
                      flow of the wastegate shows a not negligible dependence on
                      the turbine pressure ratioΠT,ts, which shows an increase of
                      up to ∆A3,s = $25\%$ (ΠT,ts = 1,2–>ΠT,ts = 3). • The
                      turbine efficiency and flow rate of the wheel can usually be
                      considered independent from the opening angle of the
                      wastegate. The investigations on the double entry turbine
                      based on these findings can be summarized as follows: •
                      The isentropic area of flow A31,s changes for small (e.g.
                      θWG = 6◦) wastegate angles by up to $600\%$ depending on
                      the pressures in both scrolls (the scroll pressure ratio).
                      • The asymmetrical discharge through the two wastegate
                      channels results in a shift of the flow condition upstream
                      of the turbine wheel. • By using the newly developed
                      model, the simulated pressure trace matches the measurement
                      and the deviations in the gas exchange work is reduced by
                      $40\%.$ • Additionally, the model enables the prediction
                      of the wastegate angle to improve the setup of engine
                      control units.},
      cin          = {412310},
      ddc          = {620},
      cid          = {$I:(DE-82)412310_20140620$},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2020-10177},
      url          = {https://publications.rwth-aachen.de/record/804290},
}