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Detailed design features of a new wind tunnel for studying the effects of thermal stratification


, : Detailed design features of a new wind tunnel for studying the effects of thermal stratification. Atmospheric Environment Part A General Topics 25(7): 1257-1262

A new wind tunnel has been developed for the Sonderforschungsbereich 210 at the University of Karlsruhe to study the effects of thermal stratification on flow and diffusion in the atmospheric boundary layer, particularly to simulate a convective boundary layer and diffusion processes in this flow condition. The wind tunnel is of the closed circuit type. The return section is subdivided into 10 layers, each of which is heated individually and driven by a separate fan. The temperature in the return section can be controlled in the range of 20–200°C and the velocities in the range of 0.5–8 ms−1. The individual control of temperature and velocity in each layer generates temperature and velocity profiles at the test section entrance. Thus, the test section length and the energy requirements can be reduced considerably in comparison with conventional stratified wind tunnels, and a wide range of thermal stratifications can be generated.In this paper the concept and details of the construction will be discussed; furthermore, details of the control device and the facility safety system will be presented.

US$19.90

DOI: 10.1016/0960-1686(91)90236-Z


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