Surface temperature measurement by means of the single-shot lifetime TSP

Non-intrusively acquiring the temperature on a surface can provide the necessary insight in not only developing efficient machinery but also studying sensitive phenomena footprints. The advances in the luminosity of phosphorescent temperature sensitive molecules have provided experimentalists the necessary tools to study near-wall flow features, which in the past could be observed only in numerical simulations or with low resolution and time consuming experimental procedures. A relatively recent breakthrough in the optical measurement methods is the development of a Europium based luminescent molecule that displays outstanding lifetime properties. The single-shot lifetime method, known for its flexibility yet low signal-noise ratio, could thus be successfuly applied in an open surface towing facility. The issue of the excitation light pattern variation, which render the data acquired with the intensity method obsolete, caused by water waves and impurities drifting in the water could thus be efficiently counteracted.

The project focuses on the study of the near-wall features of the vortical structures which occur at aerodynamically low Reynolds numbers, at which laminar separation bubbles occur. To reliably study the sensitive phenomenon, an artifical heat flux is created on suction side of an SD7003 foil and the applied heating power and angle of attack are varied, so to be able to extract as much information as possible without systematically influencing the sensitive phenomenon.



  • German Aerospace Center (DLR)


Person in charge:

  • M.Sc. Tudor-Victor Venenciuc



  • German Research Foundation (DFG)