Unsteady cooling

Unsteady Effects are becoming increasingly important in the analysis and evaluation of cooling concepts. The systematic influence due to a targeted use of unsteady phenomena can result in an overall increase of the efficiency of gas turbines or aircraft engines. Therefore, at the Institute of Gas Turbines and Aerospace Propulsion innovative cooling concepts for various turbine components are investigated, which result in enhanced heat transfer as a consequence of the pronounced flow unsteadiness.

  • Numerical:
    • Large-Eddy-Simulationen
    • Skalenadaptive Simulationen
  • Experimental:
    • Hochinstationäre Messtechnik
    • Wärmeübergangssensoren
    • LDA
    • MRV

Pulsating Impingement Cooling in the Turbine Casing:

(LuFo IV – Call 3 & AG Turbo 2020)

Within this research project possible applications of the periodically unsteady impingement cooling inside the turbine casing are investigated. A promising concept was identified which accomplishes pulsating jet impingement by using the fluctuating pressure field of the rotating turbine blades. Based on analytical considerations and numerical flow simulations suitable casing configurations were designed and evaluated. In an experimental study the sensitivity of the most promising configurations towards parameter variations was examined. The results of these different approaches provide a comprehensive insight in this new cooling method and reveal the possible benefits in efficiency as well as application limits. The goal of the project is to identify the essential design parameters and formulate design criteria for the implementation of this advanced cooling technology.