High-low pressure turbine transition section layout structure and design method thereof

Abstract

The invention relates to a high-low pressure turbine transition section layout structure and a design method thereof, in particular to the transition section layout structure with a supporting plate and a low-pressure turbine guider fused and the design method thereof, and belongs to the technical field of aircraft engine turbines. The high-low pressure turbine transition section layout structure and the design method thereof are characterized in that the single-row blade fusing design is adopted in supporting plate blades and low-pressure turbine guider blades inside a transition section, the supporting plate function is achieved, the low-pressure turbine guider function is also achieved, meanwhile, the nonaxisymmetrical modeling is used for regulating and controlling the pressure gradient inside a channel on the hub section of the transition section, and the flow loss of the transition section is reduced. The high-low pressure turbine transition section layout structure and the design method thereof can be directly used in high-performance aviation gas turbine engines, compared with a transition section structural layout that two rows of supporting plate blades and two rows of low-pressure turbine guider blades are arranged in the prior art, by the adoption of the transition section layout, the aerodynamic performance of the transition section can be improved, meanwhile, the axial length of the transition section of a military turbofan engine and the axial length of the transition section of a civil turbofan engine can be obviously decreased, the number of engine parts is reduced, and therefore the thrust-weight ratio of aircraft engines can be substantially improved.

Description

technical field [0001] The invention relates to a layout structure and design method of a high-low pressure turbine transition section, in particular to a transition section layout in which support plate blades and low-pressure turbine guide blades are integrated, which can greatly improve the compactness of the high-low pressure turbine transition section and reduce turbine The number of components can reduce the weight of aviation gas turbine engines and improve performance, especially for civil large bypass ratio aviation gas turbine engine turbine components. Background technique [0002] The high-low pressure turbine transition section is an annular passage used to connect the high-pressure turbine and the low-pressure turbine. Since the transition section plays a key role in connecting the preceding and the following in the engine, whether its design is reasonable or not directly affects the performance of the engine and the matching relationship between the high-press...

AI Technical Summary

Problems solved by technology

[0003] However, the large curvature and high diffusion characteristics of the ultra-compact high-low pressure turbine transition section make the boundary layer separation prone to occur inside the ultra-compact transition section. In order to meet the engine cooling and lubrication requirements (allowing various oil pipes and air pipes to pass) and engine structure Support requirements, the transition section usually has a number of thicker strut blades built in, which further strengthens the secondary flow inside the ultra-compact transition section, and increases the flow field distortion at the inlet of the low-pressure turbine while sharply reducing the aerodynamic performance of the transition section and swirl strength, increasing the difficulty of low-pressure turbine design

There are also some prior art, as disclosed in Chinese Patent Publication No. CN103437888A "A Transition Section Structure of High and Low Pressure Turbine", the long blades of the transition section support plate and the short blades of the low pressure turbine guide adopt the integrated structure layout of large and small blades , where the long blades are used to realize the function of the support plate, and the short blades are used to realize the function of the low-pressure turbine guide, which improves the compactness of the high-low pressure turbine transition section and improves the aerodynamic performance of the transition section, but still exposes the high-low pressure turbine transition section Performance and compactness can not meet the shortcomings of actual needs

Images