Method for Comparing the Stability Expansion Capabilities of Case Treatment Schemes

Abstract

The invention provides a method for comparing the stability expansion capabilities of casing processing schemes. This method uses the control volume analysis method, relies on single-channel numerical simulation, and does not need to calculate the entire characteristic line of various circumferential groove schemes. It can quickly and accurately compare the stability expansion capabilities of various schemes, and has good universality. It can quickly and reliably compare the pros and cons of different compressor casing treatment schemes, greatly improving the pertinence of the initial design, saving time and money. Development costs.

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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