Axial flow compressor transonic-level stationary blade with adjustable chord length

Abstract

The invention provides an axial flow compressor transonic-level stationary blade with adjustable chord length. The axial flow compressor transonic-level stationary blade comprises a blade body and a blade movable section, wherein a chute is formed in the blade body, the outer end of the chute extends to the tail end of the blade body, the blade movable section is movably mounted in the chute of the blade body along the extension direction of the chute, when the blade movable section is located at the initial position, the tail end of the blade movable section is connected with the tail end of the blade body, the tail end of the blade movable section and the tail end of the blade body jointly form the tail edge of an axial flow compressor transonic-level stationary blade, and the axial flow compressor transonic-level stationary blade has the minimum chord length. According to the invention, the blade movable section can move in the chute of the blade body, and the chord length of the axial flow compressor transonic-level stationary blade is adjusted by adjusting the extension length of the blade movable section from the chute, so that the chord length of the stationary blade can be flexibly adjusted along with variable working conditions so as to reduce shock wave loss and backward angle under design working conditions and improve the surge margin under variable working conditions.

Description

technical field [0001] The invention relates to the field of compressors, in particular to a transonic-stage stationary vane of an axial flow compressor with adjustable chord length. Background technique [0002] With the development of compressors in the direction of high pressure ratio, large flow rate, and wide working range, it is particularly important to expand the angle of attack range for safe operation of the blades, reduce blade loss, and improve the uniformity of blade outlet airflow. A large change in the angle of attack will cause the flow inside the blade to stall, and the efficiency of the compressor will drop sharply; when approaching extreme conditions, the change in the lag angle will cause the airflow at the compressor outlet to deviate from the axial direction, which will cause greater losses in the downstream. [0003] The stator blades of the axial flow compressor mainly play the role of adjusting the direction of the airflow and boosting the pressure. ...

AI Technical Summary

Problems solved by technology

[0004] However, the chord lengths of the stator blades of the existing axial flow compressors are all fixed and non-adjustable

For example: the Chinese utility model with the authorized announcement number CN205858782U discloses a high-efficiency equal-width axial flow fan blade, but its flap is fixedly connected to the main blade, so the blade chord length cannot be flexibly adjusted according to changing working conditions

Another example: the invention patent with the authorized announcement number CN102996328B discloses an extension of a fan rotor blade, but the extension is bonded to the rotor blade through an adhesive layer, resulting in the blade chord length cannot be flexibly adjusted with changing working conditions

Another example: the Chinese utility model with the authorized notification number CN203770214U discloses a large-scale axial flow fan impeller with flaps, but the inner end of the flaps is fixedly connected to the hub, so that the chord length of the blades cannot be flexible with changing working conditions adjust

Images