Abstract
Different types of wind tunnels for industrial aerodynamics are described briefly. The influence parameters effecting the reliability of wind tunnel test results are discussed extensively. For wind tunnels used for building aerodynamic investigations in smooth flow the effect of blockage on the drag coefficient and the pressure distribution around simple bodies is discussed. For full size car aerodynamic wind tunnels results of comparison tests are reported and the physical reasons for the differences are discussed. Most of the differences seem to be due to the non-appropriate flow situation in the open test sections. Based on a new jet calculation method developed by Regenscheit an example of an intake calculation for an open jet is demonstrated. For wind tunnel diffusors some improvement is possible, if step diffusors and angular diffusors are combined.
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