Double-spiral-pipe type gas-to-gas heat exchanger in annular channel

Abstract

The invention discloses a double-spiral-pipe type gas-to-gas heat exchanger in an annular channel and relates to the field of gas-to-gas heat exchangers. The double-spiral-pipe type gas-to-gas heat exchanger comprises a plurality of heat exchange units evenly arranged in the annular channel in the circumferential direction of the annular channel. Cold airflow in the annular channel moves axially. Each heat exchange unit comprises a hot airflow flow-in gas collection chamber, a hot airflow flow-out gas collection chamber, and a plurality of spiral heat exchange pipes, wherein the hot airflow flow-in gas collection chamber and the hot airflow flow-out gas collection chamber are arranged in the cold airflow flowing direction, and the two ends of the spiral heat exchange pipes communicate with the hot airflow flow-in gas collection chamber and the hot airflow flow-out gas collection chamber correspondingly. Each spiral heat exchange pipe comprises outer spiral heat exchange pipe bodies and inner spiral heat exchange pipe bodies which are arranged at intervals in the radial direction of the annular channel, and the outer spiral heat exchange pipe bodies and the inner spiral heat exchange pipe bodies are sequentially arranged in the cold airflow flowing direction to form heat exchange pipe bundles. An inlet of the hot airflow flow-in gas collection chamber and an outlet of the hot airflow flow-out gas collection chamber are located in the same end of the corresponding heat exchange unit and penetrate through the inner wall or the outer wall of the annular channel, and the other end of the heat exchange unit is a free end.

Description

technical field [0001] The invention relates to the field of gas-gas heat exchangers, in particular to a double-spiral tube type gas-gas heat exchanger in an annular channel. Background technique [0002] Air ducts widely exist in various engineering fields, such as aviation, aerospace, ships, vehicles, nuclear technology, etc. For different fields, air ducts have different forms, and the more common ones are square, circular, and circular. For some complex cutting-edge fields, such as air-space pre-cooling engine external duct, the air flow rate often reaches transonic or supersonic speed. At this time, the heat transfer design and structural design of the heat exchanger must meet the requirements of aerodynamic performance and thermal performance at the same time. Require. Annular air ducts are often found in the external ducts of aero-engines and aerospace pre-cooling engines. At this time, in addition to meeting the flow and resistance characteristics, the heat exchang...

AI Technical Summary

Problems solved by technology

The serpentine tube heat exchanger has a long flow in the tube, a small number of flow channels, high flow resistance in the tube, uneven distribution of thermal stress, and poor heat transfer effect

Compared with coiled tube heat exchangers, plate-fin heat exchangers and original surface heat exchangers are compact in structure, but their pressure resistance and thermal expansion adaptability are poor, their sealing is not good, and their applicable temperature and pressure ranges are limited.

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