Calculation of flow turbulence and analysis on screens setting-up in continuous and transonic wind tunnel

Abstract

Turbulence intensity in test section is an important index to evaluate the flow-field performance of wind tunnel, and provide guarantee for model's dynamics and accurate test. The prediction model should be established to evaluate the effect of rectification design to ensure the turbulence-intensity index. Two methods are introduced and used to predict the turbulence-intensity of a continuous and transonic wind tunnel comparing with test results. It was found that the turbulence-intensity variation trend obtained from the two methods is basically same, turbulence-intensity attenuation is mainly concentrated in the first three screens, about 65%, the result calculated by model-one is 21% larger than the measured value and the model-two result is much closer. These two methods can be used to optimize the design of rectifying device effectively although the results obtained by two methods are slightly different form the measured value.