Development of a temperature-sensitive paint for test models with moderately elevated surface temperatures in a hypersonic shock tunnel

Abstract

Predictions of thermal loading on flight geometries in hypersonic shock tunnels is an ongoing challenge in hypersonic aerothermodynamics. Increasingly complex geometries and the need for well-resolved flow features has resulted in the use of optically-active coatings as a measurement method. In the case of the measurement of surface heat flux, this is accomplished with temperature sensitive paint (TSP). The application of TSPs to test models at the High Enthalpy Shock Tunnel Göttingen (HEG) at the German Aerospace Center (DLR) has become one of the oft-used measurement methods. Furthermore, in order to simulate flight vehicle surface temperatures at the HEG, artificial model heating technology has undergone much investigation in previous years. In this work, development of a new TSP for application to heated surfaces (H-TSP) will be elaborated. In addition, planned experiments in a shock tube will be detailed, in which the objective is to quantify the dynamic properties of the candidate H-TSP.