Thermoacoustic loop direct current suppression method and system

Abstract

The embodiment of the invention provides a thermoacoustic loop direct current suppression method and system. According to the thermoacoustic loop direct current suppression method and system, a firsttime-average pressure difference in a single unit thermoacoustic loop system is taken as an optimization goal, under the condition that the volume of a thermal buffer pipe is constant, the section area of the thermal buffer pipe is reduced, and the first time-average pressure difference is made to be less than a set threshold value; a second time-average pressure difference of the two ends of a heat regenerator after the section area of the thermal buffer pipe is reduced is obtained, by means of the manner that heat exchangers are added at the two ends of a resonating pipe, when the heat exchangers change the in and out temperature difference range of the resonating pipe, the two ends of the resonating pipe generate an additional time-average pressure difference equivalent to the second time-average pressure difference in the forward or reverse direction; and a reverse deduction method is adopted, the working medium density difference generated by the reverse temperature difference ofthe thermal buffer pipe and the high time-average kinetic energy characteristic inside the resonating pipe inside a loop are utilized, and loop time-average mass flow suppression and time-average massflow suppression adjustment in an actual system are realized.

Description

technical field [0001] The present invention relates to the technical field of thermoacoustic heat engines, and more specifically, to a thermoacoustic loop DC suppression method and system. Background technique [0002] The working principle of the thermoacoustic heat engine is that under the action of the sound field modulation of the compressible fluid, the gas microgroups in the heat exchanger and the regenerator complete the mesoscopic thermodynamic cycle by reciprocating oscillation at the equilibrium position, and through the mutual relay between the microgroups, Finally, the macroscopic heat and work conversion process is realized. A thermoacoustic heat engine can realize thermoacoustics to become a thermoacoustic engine or a thermoacoustic generator, and acoustic cooling (heat) to become a thermoacoustic refrigerator or a thermoacoustic heat pump. For a thermoacoustic heat engine that uses the gas in the thermal buffer tube as an expansion piston to isolate the high...

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Problems solved by technology

So far, there are mainly two methods for suppressing direct current: elastic membrane and asymmetric jet pump; the elastic membrane device can realize sound wave transmission because of its elasticity; the elastic membrane does not allow penetration, so it can be used in a large range The time-average mass flow is suppressed, but the disadvantage of the elastic membrane DC blocking device is that the elastic membrane is generally made of rubber material, which is very easy to damage and has poor stability during long-term operation; and for an asymmetric jet pump, the basic working principle of the jet pump is to use reciprocating The asymmetry of the flow in two directions produces a time-average pressure drop to achieve the time-average mass flow that the system needs to resist, but it works by increasing the loss of the system, and uses the difference in the loss in the two directions , which affects system efficiency, and the fixed structural design has poor adaptability to working conditions

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