Design and Fabrication of Coanda Suppressor Flow Visualization Model

摘要

Because the Navy Coanda noise suppressor exhibited three-dimensional flow anomalies a 1/2oth scale transparent laboratory model was fabricated to provide for visualization of the internal flow. Identification of flow anomalies and methods of correcting them by geometric design changes thus eliminating local acoustic lining erosion was the primary purpose for the model. In addition, model experimental flow data were to be correlated to analytical computer codings so they could be applied to Coanda suppression system designs with a higher level of confidence.. The 1/2oth scale transparent model was fabricated and installed in the Boeing-Wichita air laboratory. Several checkout runs were made and the functional capability of the system was verified. These checkout runs showed that the model accurately represents the full scale flow and recirculation that had been deduced from the full scale demonstration tests. (Author)