Design for transonic axial fan blade angular seam casing treatment structure

Abstract

The invention discloses a design for a transonic axial fan blade angular seam casing treatment structure, and belongs to the technical field of turbo machinery. According to the design for the transonic axial fan blade angular seam casing treatment structure, a plurality of narrow seams are formed in a fan casing in the axial direction and are uniformly distributed in the circumferential direction to form an axial seam casing treatment structure, and the width of the axial seam casing treatment structure covers the whole axial chord length of blade tips; and opening surfaces of the axial seam casing treatment structure rotate by a certain angle in the direction of the blade installation angle so as to form the blade angular seam casing treatment structure. The design for the transonic axial fan blade angular seam casing treatment structure has the advantages that the air-entraining direction and the air-jetting direction of the blade angular seam casing treatment structure are matched with the air flow direction in channels of the blade tips, and therefore the air-entraining amount and the air-jetting amount can be increased, and the mixing loss of the air flow can be reduced; and the stability extension capability of the blade angular seam casing treatment can be enhanced, and the blade angular seam casing treatment structure further improves the comprehensive stall margin and meanwhile reduces the efficiency loss.

Description

technical field [0001] The invention relates to the technical field of impeller machinery, in particular to a design of a casing processing structure for a transonic axial flow fan blade with angular slots. Background technique [0002] At present, relevant researchers generally adopt two methods to expand the stable working range of the compressor: one is active control technology; the other is passive control technology, which is characterized by delaying the occurrence of compressor instability, or After the compressor enters into instability, it can exit in a timely and rapid manner. The commonly used methods are ① air discharge in the middle stage or final stage of the compressor, ② adjustable inlet guide vanes and stator blades, ③ double-rotor or three-rotor engines, ④ Receiver handling. The casing treatment has the characteristics of simple structure, easy implementation, strong expansion stability and resistance to import distortion, which makes it widely used in en...

AI Technical Summary

Problems solved by technology

[0003] In order to avoid the deficiencies in the prior art and to overcome the problems of poor expansion stability and large efficiency loss caused by the direction of the opening surface of the axial slot casing processing not being suitable for the airflow direction in the blade tip passage; the present invention proposes a Structural Design of Transonic Axial Flow Fan Blades with Angular Seams

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