RESEARCH OF FRACTAL AND CHAOTIC CHARACTERISTICS ON ROOM AIRFLOW AND OUTDOOR AIRFLOW

As researches on air delivery to air-conditioning room are turning from static mode to dynamic mode, especially the natural airflow simulation plan is being put forward, these, in turn, require more thorough understanding and more effective evaluation method of various airflow turbulence patterns. On the basis of large amount of carefully controlled measurements of air velocities which are generated in air-conditioning room, outdoor and by local fan, a detailed calculation and analysis has been made in the light of the rapidly developing nonlinear science—chaotic theory. We’ve found the differences between the above-mentioned airflow turbulence patterns on phase portraits, correlation dimensions and the largest Lyapunov exponents, hence deepen the understanding of the essential distinctions between these turbulence patterns, and it also lays a foundation for the control of air turbulence, natural airflow simulation and the research of the relationship between airflow turbulence and human thermal comfort. In addition, an attempt has been made to the quantitative evaluation of different airflow turbulence patterns by using the so called—short period largest Lyapunov exponent method.

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