Physical significance, calculation method and applicability of local purging flow rate

Presents the definition and physical significance of local purging flow rate (LPFR), as well as the calculation method based on Markov model. Proposes a calculation procedure for LPFR by using the computational fluid dynamics (CFD) software. Utilizes LPFR to evaluate the local ventilating effects of several kinds of typical airflow patterns. Qualitatively compares LPFR with local air change rate. Discusses the applications and limitations of LPFR.