Techniques for detailed heat transfer measurements in cold supersonic blowdown tunnels using thermochromic liquid crystals

• Published in: International journal of heat and mass transfer 2002-07, Vol.45 (16), p.3287-3297
• Main Authors: Mee, D.J., Chiu, H.S., Ireland, P.T.
• Format: Article
• Language: English
• Subjects: Compressible flows; shock and detonation phenomena; Exact sciences and technology; Fluid dynamics; Fundamental areas of phenomenology (including applications); Instrumentation for fluid dynamics; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Physics; Shock-wave interactions and shock effects; Shock-wave interactions and shockeffects; Thermal instruments, apparatus and techniques; Thermometry
• ISSN: 0017-9310; 1879-2189
• DOI: 10.1016/S0017-9310(02)00050-9

The paper presents methods for measurement of convective heat transfer distributions in a “cold flow” supersonic blowdown wind tunnel. The techniques involve use of the difference between model surface temperature and adiabatic wall temperature as the driving temperature difference for heat transfer and no active heating or cooling of the test gas or model is required. Thermochromic liquid crystals are used for surface temperature indication and results presented from experiments in a Mach 3 flow indicate that measurements of the surface heat transfer distribution under swept shock wave boundary layer interactions can be made.