Experimental and CFD study of the selected acoustic helicoidal resonator as a final element of an air installation

The work presents an analysis of the selected helicoidal resonator as the end element of the air installation. Laboratory tests of the acoustic pressure level were performed at the outlet of the air installation in a room for different flow speeds. The measurement methodology in accordance to standards PN-EN ISO 3741 and PN-EN ISO 5135, which describes the acoustic test facilities, instrumentation and procedures to be used for precision grade determination of sound power levels in octave or one-third-octave bands of a noise source in reverberation test rooms.. The numerical CFD tests show the shape of the air stream in the function of the distance from the installation outlet for different flow speeds. Due to the helicoidal shape of the analyzed acoustic helicoidal resonator, the air stream also turns, which can be used to effectively mix air in the room.