The Hot-Acoustic Testrig, which was erected and is operated in close cooperation between DLR department of engine acoustics and Technischen Universität Berlin, chair of aero engines, is a unique facility for acoustic and aerodynamic test at surfaces exposed to high temperature and grazing flow in aero engines. The basic principle of operation is the same as for the atmospheric facility Atmospheric liner test rig (DUct aCoustic Test rig, DUCT). The HAT facility consists of two sections with microphones and the test object in between. It does have anechoic terminations at both ends in order to suppress acoustic end-reflections. For the investigation of cylindrical and plane liner samples, there are test sections with circular and rectangular cross section, respectively.
Operating conditions of the facility
Acoustic tests at HAT