Evaluation of Aerodynamic Performances For Parallel and Opposed Blade Dampers Measurement of pressure coefficients and visualization of air flow in a duct

摘要

This paper presents experimental visualization results of airflow in rear of blades of dampers installed in duct systems and measurement of pressure differences between upstream and downstream of blades for parallel and opposed-blade dampers. Rear flow of damper blades is visualized using the smoke wire method with liquid paraffin. Pressure differences between the upstream and downstream of damper blades were measured with Pitot tubes and a micropressure gauge in accordance with ISO7244-1984.