Tailoring gRec for ultra Intense TUrbulence Measurements EuHIT Funded Project

Team

Benoit Michel Chabaud
CNRS - Institut Néel, Grenoble, France
Resagk Christian
Ilmenau University of Technology, Ilmenau, Germany
Robert Kaiser
Technische Universität Ilmenau, Ilmenau, Germany
Olivier Pirotte
Cern, Geneva, Switzerland
Eléonore Rusaouën
Institut Néel, Grenoble, France
Julien Salort
Ecole Normale Superieure de Lyon, Lyon, France

Overview

Research Infrastructure
CERN Cryogenic Turbulence Facility, Switzerland
Facilities used
CERN Cryogenic Turbulence Facility (GReC)
Project leader
Philippe Roche
CNRS, Grenoble, France

Abstract

CERN’s turbulence facility is a cryogenic helium jet developing in a 3-m-high cylindrical enclosure. This experiment offers amazing perspectives for the study of ultra high Reynolds number (Re-lambda up to 6000), thanks to its unusually large dimension for a cryogenic flow.

In this flow, a cutting-edge cryogenic hot-wire could possibly resolve 4.5 decades of turbulent scales, from the 40-cm eddies down to the typical 15-micron-resolution of the anemometers. But such difficult and demanding measurements are only worthwhile in a flow tailored to match at best the academic reference for axisymetric steady jet turbulence.

Before attempting this high-dynamics measurement, the GReC facility should be specially adapted for this specific objective, in particular in terms of flow stability (mass flow, temperature and direction stability), probe mounting system and absence of helium droplets in the helium gas.

The main motivation of this present proposal is to fully characterize the flow with a panoply of rough probes, and then upgrade it to match at best a model jet, putting in place conditions for a future very-wide-dynamical range experiment (to be proposed in a next proposal).