Noise Radiation from Subsonic Airflow through Single and Multiholed Orifice Plates.

摘要

The mechanisms and scaling laws for noise radiated from subsonic airflow through single and multiholed orifice plates have been studied experimentally. Simultaneous measurements were conducted of the velocity field and radiated pressure associated with jets formed downstream of sharp-edged, multiholed orifice plates. The orifice plates, containing from 1 to 31 holes, were placed at the termination of a quiet 76-millimeter inside diameter airflow facility. The characteristics of the broadband and tonal components of the radiated noise field are evaluated in terms of: (1) the orifice plate hole geometries and flow interactions and (2) the downstream jet features. (Author)