Pipe type air-air heat exchanger in annular channel

Abstract

The invention provides a pipe type air-air heat exchanger in an annular channel. The pipe type air-air heat exchanger is low in flow resistance, high in heat exchange and good in pressure resistance. The pipe type air-air heat exchanger comprises a plurality of heat exchange units which are evenly arranged in the circumferential direction of the annular channel. Cold air flow moves axially in the annular channel. Each heat exchange unit comprises a hot air flow flowing-out air collecting pipe, a hot air flow flowing-in air collecting pipe and a plurality of heat exchange pipes, wherein the hot air flow flowing-out air collecting pipe and the hot air flow flowing-in air collecting pipe are arranged in the flowing direction of the cold air flow, and the two ends of the heat exchange pipes are communicated with the hot air flow flowing-out air collecting pipe and the hot air flow flowing-in air collecting pipe. The heat exchange pipes are sequentially arranged and distributed into a heat exchange pipe bundle in the flowing direction of the cold air flow. Outlets of the hot air flow flowing-out air collecting pipes and inlets of the hot air flow flowing-in air collecting pipes are located at the same ends of the heat exchange units and arranged to penetrate the inner wall or the outer wall of the annular channel, and the other ends of the heat exchange units are free ends. The heat exchange pipes are assembled into the heat exchange bundle, and the number of hot flow body flow channels is increased through the hot air flow flowing-out air collecting pipes and the hot air flow flowing-in air collecting pipes arranged at the two ends; and pipe internal flow resistance is greatly reduced, and the resistance loss of air collecting components is small.

Description

technical field [0001] The invention relates to the field of gas-gas heat exchangers, in particular to a 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 exchanger must also h...

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, and the flow arrangement is a downstream heat exchanger, which has poor heat transfer effect

Compared with coiled tube heat exchangers, plate-fin heat exchangers and original surface heat exchangers are compact in structure, but have poor pressure resistance and thermal expansion adaptability, poor sealing, and limited applicable temperature and pressure ranges

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