Nintendo Found A Way To Patch An Unpatchable Coldboot Exploit In Nintendo Switch
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When the air flow is in direct contact with the jet of the nozzle, the relative turbulence shear caused by the narrow jet flow increases abruptly. The transverse and longitudinal components of the acoustic field are generated by the abrupt change in the flow passage, causing the air to vibrate. The disturbance caused by the acoustic pressure field causes the turbulence near the jet surface to drive the component flow to vibrate because of the effect of mutual action. The acoustic feedback loop is formed between the recirculation flow and the acoustic flow. As the closed-loop negative feedback relationship is formed, the vibration of the recirculation flow causes the acoustic pressure field to rise, and the pressure of the surface of the jet shear layer is increased. As a result, a positive feedback relationship is created between the acoustic pressure field and the velocity field. The jet surface vibration causes the jet to vibrate and produce an impact, resulting in the entire blade convolution vibration caused by a high-velocity jet shear layer. If the air flow pressure is always lower than the minimum flow speed of the continuous jet and the turbulence of the shock wave is large, the eventual growth of the jet will cause the turbulence to grow further and improve the frequency response of the noise damping effect of the jet. The vibration of the blade convolution of the shock wave will be exposed, which will form the recirculation flow and increase the noise damping effect and reduce or even eliminate the negative feedback. The above mechanism causes low-frequency pressure fluctuation of the rear-blade zone, and it is the main phenomenon of acoustic feedback in open jet wind tunnels. The amplitude of the variability of the wind tunnel test data is small, and the maximum amplitude is less than
The acoustic feedback phenomenon of the open jet wind tunnel is due to the instability of the flow field in the mixing layer. In addition, the air flow of the stationary wind tunnel is mainly driven by the effect of the pressure difference of the jet, and the maximum disturbance of the jet is the working fluid in the jet, so there is a certain level of difference between the maximum disturbance of the jet and the maximum disturbance of the cockpit control active flow. d2c66b5586