High altitude two-stage turbine supercharger variable working condition matching design method

Abstract

The invention provides a high altitude two-stage turbine supercharger variable working condition matching design method. The capacity of a supercharging system for adapting to the engine variable working condition is improved while the design working condition performance is guaranteed, the reliability and high efficiency are enhanced, and the basic control rule of a variable supercharging systemcan be given. The method particularly comprises the steps that a center line design and analysis method is adopted, the variable working condition characteristic of a compressor and turbine parts areanalyzed on the basis of a one-dimensional loss model, and the design phase rapid analysis performance and design parameter optimization requirements are met; according to the variable working condition performance matching requirement of the supercharging system, a two-stage compressor pressure ratio and turbine expansion ratio allocation scheme is optimized, and it is guaranteed that the stall margin of the compressor stage and the efficiency of the turbine stage meet the design requirement; secondary design optimization is conducted on parts in the compressor stage on the basis of non-design working condition characteristic analysis result, and the variable working condition performance of the compressor stage and the turbine stage is further improved. Accordingly, the method can be used for scheme design and control rule research of two-stage turbine supercharging system under the high altitude environment.

Description

technical field [0001] The invention relates to a matching design method for variable working conditions of a two-stage turbocharger, belonging to the technical field of turbochargers. Background technique [0002] The turbocharger is widely used in automobile engines and piston aeroengines. Its function is to use the exhaust gas discharged from the engine cylinder to do work and push the turbine blades to do work, thereby driving the booster compressor to work and increasing the intake pressure and density of the engine. The turbocharger can effectively improve the volumetric efficiency of the engine, increase the power per liter of the engine, and significantly improve the power performance of the engine, especially to maintain the power recovery of the engine when it is working at a higher altitude. [0003] For the aviation piston engine, in order to increase its practical ceiling, the use of a turbocharger is an inevitable way. The boosting capacity of the turbocharger ...

AI Technical Summary

Problems solved by technology

Compared with the turbocharger of a vehicle engine, the change of intake conditions makes it more difficult to match the flow and power of the two-stage supercharging, which limits the stable working range of the turbocharger

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