Further Noise Measurements in a Slotted Cryogenic Wind Tunnel
Abstract
This Memorandum describes some noise measurements in a cryogenic wind tunnel with slotted walls at subsonic and transonic speeds. Pressure fluctuations were measured at three positions on the sidewall of the working section, the downstream end of the plenum chamber and near the inlet and outlet of the first diffuser. Analysis of the measurements suggest that the diffuser noise field can be represented by the superposition of monopole, dipole and quadrupole sources. The existence of these sources suggests that the diffuser flow may be separated for a significant portion of its length, either because of poor entry conditions or the presence of the model support strut. As expected, a small model at a small angle of incidence generally has a small effect on the noise measurements in the working section. Recommendations are made for further research.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1990
- Accession Number
- ADA233572
Entities
People
- D. G. Mabey
Organizations
- Royal Aircraft Establishment