Project Details
Projekt
Grid-generated turbulence in compressible organic vapour flows
Subject Area
Fluid Mechanics
Term
since 2026
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 572599951
For more than a hundred years, grid-generated turbulence has been virtually the only way to experimentally investigate the ideal of homogeneous isotropic turbulence (HIT). Grid-generated turbulence represents an indispensable source for turbulence research and the development of numerical calculation methods. Nevertheless, there is currently a significant gap in the literature regarding data on grid-generated turbulence in compressible flows, particularly for real gases like organic vapours. The overarching goal of the research project is the systematic and comprehensive experimental determination of data on grid-generated turbulence in compressible real gas flows in order to clarify important fundamental questions in turbulence theory. Systematic measurements of turbulent fluctuations in a compressible real gas flow will be carried out over a very wide spacing interval behind classical and fractal grids using hot-wire probes. In addition to the grid configuration, the Reynolds and Mach numbers, as well as the real gas factor of the fluid, will be varied separately. Of primary interest is the determination of the decay laws as a function of grid configuration, Reynolds number, Mach number, real gas factor, and isentropic exponent. The aim is to investigate the influence of initial conditions on turbulence through different grids (classical and fractal), multiple grids, and active nozzle grids. Schlieren optical investigations on an upscaled elementary grid will help to investigate compressibility effects in detail and better understand the role of shocks in turbulence generation. In particular, it will be clarified how turbulence develops as the grid's choking Mach number is approached. The research project aims to establish, for the first time, a systematic and broad data collection for compressible grid flows, including real gas influences, and to make this data available to the scientific community without restriction for further use and application.
DFG Programme
Research Grants
International Connection
France
Cooperation Partners
Professorin Dr. Paola Cinnella; Professor Dr. Xavier Gloerfelt
