Central choke cavity isolated air wave tube

Abstract

The invention provides an isolated gas wave tube with a middle wave blocking cavity, and belongs to the technical field of gas expansion refrigeration and unsteady flowing gas wave transmission and energy exchange. The wave blocking cavity with a limited volume is formed in the middle section of each gas wave tube. Two ends of the wave blocking cavity are respectively connected and communicated with a gas wave tube front section and a gas wave tube rear section, and a flow passage which is expanded firstly and then is shrunk is formed inside the gas wave tube. Meanwhile, an inner diameter through-flow sectional area of the gas wave tube front section is smaller than a tube through-flow sectional area of the rear section. Therefore, a reflected shock wave in the tube is buffered and subjected to energy dissipation in the wave blocking cavity, and the residual reflected shock wave returns to the gas wave tube rear section to be subjected to reinforced dissipation, so that the reflected shock wave is returned to a gas wave tube orifice less, direct heating on refrigerated gas is reduced, the temperature of the tube wall of the gas wave tube front section is reduced, and heat transfer on the refrigerated gas in the tube is reduced. According to the gas wave tube adopting the new principle structure, refrigerating efficiency can be improved by over 5% averagely, a wave trough efficiency value when jet flow efficiency is mismatched with the tube length is increased, difficulty in design matching is reduced, and performance under variable conditions of gas wave refrigeration is improved.

Description

technical field [0001] The air wave tube with the central wave-blocking cavity of the present invention is also called a receiving tube, an oscillating tube or a dissipating tube, which is mainly used in a gas wave refrigerator and belongs to the technical field of gas expansion refrigeration and unsteady flow gas wave transmission and energy exchange . Background technique [0002] Gas wave refrigerator is a gas expansion refrigeration machine with unique advantages, which is improved and innovated on the basis of heat separator. It is divided into two types: rotary type and static type. The significant difference between the gas wave refrigerator and the heat separator is that the former is connected with a cavity with a limited volume at the end of each of its gas wave tubes (also known as receiving tubes, oscillating tubes and dissipation tubes). , called the shock absorber (see Chinese patent ZL89213744.4). [0003] The pulsed jet is injected from the inlet of the gas...

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Problems solved by technology

But it increases the structural complexity and operating conditions of the air wave machine

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