A thermoacoustic loop DC suppression method and system

Abstract

Embodiments of the present invention provide a thermoacoustic loop direct current suppression method and system, which takes the first time-average pressure difference in a single-unit thermoacoustic loop system as the optimization target, and under the condition that the volume of the thermal buffer tube remains constant, the reduction The cross-sectional area of ​​the heat buffer tube is reduced so that the first time-average pressure difference is less than the set threshold; the second time-average pressure difference at both ends of the regenerator after the cross-sectional area of ​​the heat buffer tube is reduced is obtained by Heat exchangers are added at both ends of the resonance tube, so that when the heat exchanger changes the range of the temperature difference between the inlet and outlet of the resonance tube, the two ends of the resonance tube will generate a forward or reverse direction corresponding to the second time-average pressure difference. additional time-average pressure difference. Using the reverse deduction method, the time-average mass flow suppression in the loop and the time-average mass flow in the actual system are realized by using the working medium density difference caused by the reverse temperature difference of the thermal buffer tube and the high time-average kinetic energy characteristics in the resonant tube in the loop Inhibition regulation.

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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