Unsteady wake from upstream components of landing gear impinging on downstream components could be a strong
noise source. The use of a plane jet is proposed to reduce this flow-induced noise. Tandem rods with different gap widths
were utilized as the test body. Both acoustic and aerodynamic tests were conducted in order to validate this technique.
Acoustic test results proved that overall noise emission from tandem rods could be lowered and tonal noise could be
removed with use of the plane jet. However, when the plane jet was turned on, in some frequency range it could be the
subsequent main contributor instead of tandem rods to total noise emission whilst in some frequency range rods could still be
the main contributor. Moreover, aerodynamic tests fundamentally studied explanations for the noise reduction. Specifically,
not only impinging speed to rods but speed and turbulence level to the top edge of the rear rod could be diminished by the
upstream plane jet. Consequently, the vortex shedding induced by the rear rod was reduced, which was confirmed by the
speed, Reynolds stress as well as the velocity fluctuation spectral measured in its wake. This study confirmed the potential
use of a plane jet towards landing gear noise reduction.