The noise radiation of the aircraft carrier seriously threatens the physical and mental health of the ground personality and the safety of the precision instruments on the aircraft carrier, and this problem can be simplified as a supersonic jet impact inclined plate problem. This paper studies the influence of the surface groove structure on the impact noise characteristics with high frequency Particle Image Velocimetry (PIV) and far field noise measurement to explore the noise reduction mechanism of the groove structure and determine the nozzle-deflector impact distance. The results show that the slotted surface of the inclined plate can effectively reduce the impact jet noise, and the noise reduction effect is closely related to the impact distance. If the impact distance is 3-5 times the nozzle diameter (L/d=3-5), the noise reduction effect of the slotted inclined plate is the best at L/d=3.8. The slotted inclined plate can effectively reduce the noise of supersonic impinging jet mainly because of its good inhibitory effect on the screech tone. When the Mach number is 1.12, the main sound source area of the screech tone is located at the rear edge of the fourth shock cells for a circular nozzle with an outlet diameter of d=56 mm, which is consistent with the current general knowledge. With a proper impact distance, the groove structure can affect the shock cells, thereby effectively suppressing the screech tone.
QI Longzhou
,
ZHAO Kun
,
FENG Heying
,
ZHANG Junlong
,
QIN Chen
. Influence of slotting on inclined plate at different impact distances on impact noise of supersonic jet[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022
, 43(8)
: 125712
-125712
.
DOI: 10.7527/S1000-6893.2021.25712
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