CN203116588U

CN203116588U - Novel sawtooth fin

Info

Publication number: CN203116588U
Application number: CN 201220735171
Authority: CN
Inventors: 庄莉; 包亚强; 赵鹏涛; 吴京泽
Original assignee: AVIC Jincheng Nanjing Engineering Institute of Aircraft Systems
Current assignee: AVIC Jincheng Nanjing Engineering Institute of Aircraft Systems
Priority date: 2012-12-27
Filing date: 2012-12-27
Publication date: 2013-08-07
Anticipated expiration: 2022-12-27

Abstract

The utility model discloses a novel sawtooth fin, aiming at providing a fin with good strength, higher heat exchange efficiency, smaller drag characteristic, and the anti-freezing and anti-blocking effect that the fin can avoid the accumulation of ice grains on a transition section due to the over short stagger arrangement length. The technical scheme is that the fin is a discontinuous slip which is staggered front and back, the section of the slip is rectangular, and the uninterrupted flow length of the slip is 12mm. Proved by tests, under the same Reynolds number, the coefficient of heat transfer of the fin is increased by above 2 times compared with a classic sawtooth fin of the same drag level; the drag coefficient of the fin is about two fifths that of the classic sawtooth fin of the same heat exchange performance level; and therefore, the fin is reasonably applied in a heat exchanger design, the size of a heat exchanger can be reduced, and the weight is lightened.

Description

A kind of novel saw tooth fin

Technical field

The utility model relates to a kind of fin for various medium heat exchangers, be particularly useful for efficient that Aero-Space use require high, resistance require little, volume is little, lightweight high strength heat exchanger.

Background technology

Development along with most advanced branches of science technology in modern age; use in the radiator that particularly aerospace field is used in engineering; run into some efficient through regular meeting and require high strength heat exchanger high, that the resistance requirement is little, volume requirement is little, the weight requirement is light; for this heat exchanger; present general classic fin; be difficult to satisfy its performance requirement as plain fin, stagger arrangement fin, louvre type fin, corrugated fin, pin-fin, perforated fin etc.; generally all show as efficient cross low or resistance excessive, thereby cause the product overall weight overweight or volume is excessive.

The utility model content

The purpose of this utility model provides a kind of novel saw tooth fin, and intensity is good, and heat exchange efficiency height, drag characteristic are little.

Technical solution of the present utility model is: a kind of novel zigzag heat exchange fin, be the staggered discontinuous slip in front and back, and described slip cross section is rectangle, the uninterrupted length that flows of slip is 12mm.

The beneficial effects of the utility model: fluid is flowed into from the direction of square-section, utilize fin to destroy the boundary layer and come augmentation of heat transfer, improved heat transfer coefficient, simultaneously owing to increased the uninterrupted length that flows, fluid is equivalent to flow in plain fin in 12mm flows, and can reduce drag losses.Increase the uninterrupted length that flows simultaneously and also can avoid the accumulation of ice pellets on the transition section that cause because stagger arrangement length is too short, played antifreeze stifled effect.Therefore, this fin has not only kept the saw tooth fin high heat-exchanging performance, has also had the characteristic of plain fin ground resistance concurrently.Simultaneously can play antifreeze stifled effect.Test shows that under identical Reynolds number, the coefficient of heat transfer of this type fin increases more than 2 times than the classical sawtooth fin with resistance levels; The resistance coefficient of this type fin has only with about 2/5 of the classical sawtooth fin of heat exchange property level; Be applicable to that relatively intensity is good, efficient is high, resistance is little, volume is little, lightweight heat exchanger, in design, rationally use simultaneously, also can dwindle heat exchanger volume, weight reduction.

Description of drawings

Fig. 1 is structural representation of the present utility model;

The structural representation that Fig. 2 uses for the utility model.

The specific embodiment

Below in conjunction with Figure of description the utility model is described in further detail, sees also Figure of description 1,2.

A kind of heat exchanger fin is the staggered discontinuous slip in front and back, makes towards the wing cutter with sheet metal (material is 3A21-O), and the uninterrupted length that flows of slip is 12mm, and the slip cross section is rectangle.

When the heat exchanger runner is arranged, fluid is flowed into, shown in Figure of description 1 from the direction of square-section, utilize the boundary layer destruction of stagger arrangement fin to come augmentation of heat transfer, improve the coefficient of heat transfer, utilize the uninterrupted length that flows that has increased to reduce drag losses, dwindle heat exchanger volume at last.

In engineering was used, the ratio of general fin pitch P and stagger arrangement length L was between 2 and 4, and when the uninterrupted length that flows was 12mm, drag characteristic reduced bigger, simultaneously to improve the coefficient of heat transfer influence less,

The dull and stereotyped cold face temperature etc. construction unit of distributary is made up of side plate, dividing plate, fin, strip of paper used for sealing, and as shown in Figure 2, hot limit, cold limit heat exchange profile all adopt fin of the present utility model.

Characteristics of the present utility model are on classical serrated fin basis, change cutter and make that the uninterrupted length that flows is 12mm, so not only keep the saw tooth fin high heat-exchanging performance, also had the characteristic of plain fin ground resistance concurrently, can play antifreeze stifled effect simultaneously.

Claims

1. a novel zigzag heat exchange fin is characterized in that, is the staggered discontinuous slip in front and back, and described slip cross section is rectangle, and the uninterrupted length that flows of slip is 12mm.