The split-type conical nozzles with replaceable exit sections with diameters of 30, 40 and 50 mm were designed and produced from steel by machine turning. In addition, the replaceable output parts of the nozzles with the same diameters were produced by additive technology (fused deposition manufacturing) from ABS plastic. In the acoustic anechoic chamber, the noise measurements of a single-stream cold air jet for all the nozzles at jet velocities in the range of 0.3-0.7 Mach numbers were carried out. The noise measurements were performed on distance of 2 m from the center of the nozzle exit section at angles from 30 to 105o. For different directions of noise radiation and different velocities of the jet, the power spectral density and overall sound pressure level were determined. The obtained results demonstrates that the jet noise for nozzles with diameter of 40 and 50 mm from steel and ABS plastic differs by no more than 1 dB, which is within the measurement error for these types of experiments. The nozzles with diameter 30 mm have a higher difference in noise, which can be explained by the more sensitivity of a nozzle with a small diameter to the deviations of geometric parameters when it produced by additive technology.
The interaction noise of turbulent jet with deflected flap is considered. The test objects are small-scale models of turbulent jet and flap in scale 1:6. To compare the effect of chevrons on the interaction noise level, experiments are carried out for two types of conical nozzles: conventional and chevron. It is also used conventional flap and chevron flap. Noise measurements in acoustic far field are carried out in the PNRUP acoustic chamber for directions from 15 to 105 degrees with a step of 15 degrees. The flap deflection angle varied from 0 to 45 degrees in increments of 5 degrees. The results are compared with each other. It was found that the use of chevrons for nozzle and for flap has the effect of some reduction in the interaction noise. Moreover, the jet outflowing from the chevron nozzle, when interacting with chevron flap, gives lower noise level than when interacting with conventional flap.
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