Wall separation type feedback fluidic oscillator

Abstract

The invention belongs to the technical field of fluidic control of pressure gas. A wall separation type feedback fluidic oscillator is designed by combining the generated pneumatic principle with a fluid oscillator without a moving part in the pneumatic principle based manner that fluid is jetted around a curved surface in a wall separation mode. Curved wall collision jet flow has very high sensitivity, and the main jet flow is attached to the circular curved wall, collides with wall-separated jet flow at the central position, and is guided back to a wall separation control port at the upstream portion of the jet flow through a feedback pipe to form wall-separated flow. The wall-separated flow enters one side of the circular curved wall, the wall-attached main jet flow on the side is subjected to wall separation in advance, and therefore the stable wall-attached state of the main jet flow is destroyed, the collision points of the wall-surrounding jet flow on the two sides are transferred to the wall separation side, and the collision main jet flow on the two sides is switched to the wall separation side. A jet flow receiving pipe and a feedback pipe on the wall separation side are connected to a separation wall control port on the symmetrical side, and the jet flow continuously repeats the process to generate periodic oscillation. It is proved that the wall separation type feedback fluidic oscillator can be used in strengthening or controlling fluid in various aerodynamic and chemical engineering processes.

Description

technical field [0001] The invention relates to a wall-mounted feedback jet oscillator, which is a special equipment necessary for uniform gas distribution, and belongs to the technical fields of jet engineering of pressurized gas and gas expansion refrigeration. Background technique [0002] The fluidic part has no power supply or other energy supply unit. It is a fluid control device with fluid as the working medium and no movable parts. It has the advantages of good reliability, small size, high power, low cost, etc., and can adapt to strong radiation, strong Harsh working environments such as corrosion, strong vibration and strong shock, proven to work at extremely high temperatures, even in extremely harsh environments. Additionally, they may have an almost unlimited lifespan (no moving mechanical parts), be self-cleaning, even resistant to extreme mechanical shock and vibration, and be less costly in miniaturized production. It can be successfully applied in places wi...

AI Technical Summary

Problems solved by technology

Although the existing wall-attached self-excited oscillator can oscillate stably, because the wall-attached flow time is much longer than the jet switching time, it cannot meet the time uniformity requirements of the multi-tube jet oscillator. Therefore, the present invention realizes the off-wall feedback oscillation , which solves the above oscillation problem

[0004] Jet oscillator without mechanical motion properties, this novel way of fluid flowing around the curved surface off the wall is based on the operation of pneumatic principles, so far there has been no systematic research

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