Flow characteristics and structural stability in a ventilated cabin mock-up

Abstract eng:
Airflow movement is one of the most important physical factors greatly influencing contaminants transmission in aircraft cabin. Since various perturbations are hard to control and experimental measurements are hard to handle in full-size aircraft cabin, the researches on instantaneous characteristics are seldom reported. In this work, PIV experimental investigations on the structural stability of velocity fields in a bidirectional ventilated cabin mock-up are conducted. It indicates that the velocity field is obviously unstable and there are coherent autooscillation of the large-scale flow structures in this cabin mock-up. The spatial and temporal behaviors of the large-scale flow structures and the evolution of topological characteristics of the velocity fields are presented. The structural stability theory is also used to further interpret the unstable phenomena of the velocity fields. Our present findings can serve as a base for forthcoming study of contaminants transmission and a simplified model for problem of cabin ventilation.

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