An isolated small blade for axial flow compressor rotor expansion stability

Abstract

The invention discloses a small separation blade for stability enhancement of a rotor of an axial flow compressor. The small separation blade comprises rotor blades, a rotor blade hub, small separation blade bodies and a fixing device; each small separation blade body is installed between every two rotor blades in a rotor blade grating channel, and flow control of the small separation blade bodies over fluid in rotor channels is carried out; the axial positions of the small separation blade bodies are located at the axial chord length positions of rotor blade roots at the 20% positions of the front edges of the rotor blade channels, the circumferential positions are located at the circumferential chord length positions of the rotor blade roots at the 4.6% positions of suction force faces of the rotor blades, and the small separation blade roots are connected with the rotor blade hub; the blade tops of the small separation blade bodies are connected with the suction force faces of the rotor blades through connecting pieces so that the small separation blade bodies can be fixed; and a complex inducing vortex structure generated after air flow flows through the small separation blade bodies will disturb flowing laminar sub-layers of interface layers of the suction force face of a main blade, and strengthening of tubulence energy enables flowing of laminar flow of a boundary layer to be changed into turbulent flow in advance, so that separation of the boundary layer of the laminar flow is restrained or delayed, and the steady operation margin of a compressor is improved.

Description

technical field [0001] The invention relates to the field of flow control of turbomachinery, in particular to an isolated small vane for expanding and stabilizing the rotor of an axial flow compressor. Background technique [0002] In the compressor, due to the effect of the flow reverse pressure gradient, flow separation widely exists on the blade suction surface, and with the decrease of the compressor flow rate, the flow separation becomes more and more serious, and to a certain extent, the separated fluid clogs The passage of the compressor makes the compressor enter an unstable working state, which seriously affects the performance of the compressor. Therefore, it is necessary to conduct research on flow control technology to control the flow separation of the compressor and improve its stability margin. Flow control technology uses the interaction between fluids to control the flow state by changing the local flow. It can effectively suppress flow separation and expa...

AI Technical Summary

Problems solved by technology

This active control method to improve corner separation needs to increase the air circuit, controller, actuator and power supply, and also needs external energy, which limits the applicability of the method to a certain extent.

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