Method for comparing stability expansion capabilities of casing treatment schemes

Abstract

The invention provides a method for comparing stability expansion capabilities of casing treatment schemes. According to the method, control volume analyzing measures are used, single-channel numerical simulation is relied on, the whole characteristic lines of various circumferential groove schemes do not need to be calculated, comparative analysis is only conducted on different circumferential groove treatment cases under the flow near the stall point of a smooth wall, and the stability expansion capabilities of all the schemes can be rapidly and accurately obtained through comparison. The method has good universality, the advantages and the disadvantages of different casing treatment schemes for a compressor can be rapidly and reliably compared, the pertinence of initial stage design can be greatly improved, and time and developing cost are saved.

Description

technical field [0001] The invention relates to the technical fields of gas turbines and aerodynamic thermodynamics, in particular to a method for comparing the stability expansion capabilities of casing treatment schemes. Background technique [0002] Over the years, two typical flow instability phenomena in the compressor, rotating stall (Rotating stall) and surge (Surge), have become serious restrictions on the development of high-performance gas turbines due to the complexity of the flow and the severity of the consequences. One of the main problems. The stall characteristics of modern compressors are dominated by spike-inception at the tip of the blade. In addition to the active control technology, some passive control measures such as swept blade technology, three-dimensional blade shape design, controllable diffusion blade shape, casing treatment, and inter-stage venting have been used in compressor stability regulation. Among them, casing processing has become one ...

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to form a universal criterion for the design of the casing treatment of the circumferential groove. At this stage, the practical application design of the circumferential groove still needs to rely on a large number of experiments to establish a complete database for screening, such as GE in the United States and Rolls-Royce in the United Kingdom. , have invested a lot of money to carry out large-scale circumferential groove casing processing experiments on the mechanism test bench to establish a complete database, and the development time and development costs are correspondingly high

[0004] It can be seen that whether it is the complexity of the flow instability caused by the compressor itself, or the limitations of the existing research methods and mechanism understanding, all of them have a great impact on the universality of the design criteria for the treatment of the circumferential groove casing of the compressor. obstacles

At present, there is still a lack of targeted design and screening methods for circumferential grooves, which cannot meet the lack of design criteria in the early stage of axial flow compressor circumferential groove casing design, and there is a need for screening of a large number of schemes

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