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Non-linear Acoustic Waves in Resonators Powered Resonator Tubes
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Active Flow Control Actuators
Powered resonator tube (PRT) actuators are structurally simple and robust devices. They consist of simply a small air jet opposite a cylindrical cavity (tube) of the same diameter. They work through interactions between the jet and shock waves produced within the tube. The cycle is as follows: the jet enters the tube and compresses the air within, which causes a shock wave to form, which is reflected off of the back wall of the tube. When the shockwave exits the tube it pushes back the jet. The tube is then left decompressed, and when the shock wave dissipates the jet returns and the cycle starts over. The basic powered resonator tube bank (PRTB), a series of PRT actuators sharing a common air source, is quite simple and proven effective. The problem comes in efficiency. The most likely source of compressed air for the PRTB's is an engine bleed. If the actuators require too much air they rob the engine of a lot of thrust. That's where the current research comes in. The problem has proven to be much more complicated than anticipated. The individual actuators are very easily affected by changes in airflow and pressure in the region between the jet and the tube. This has been seen and manipulated in single tube tests with a resonating cavity between the tube and jet. The difficulty and the purpose of current experiments is to develop ways to manipulate this to our advantage in multi tube banks. |
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