Framework forming axial flow turbine blade design method

Abstract

The invention belongs to the technical field of turbomachinery, and discloses a framework forming axial flow turbine blade design method, which decomposes blade design into a mean camber line design, a thickness distribution design and a stacking line design. According to the mean camber line design, two control parameters are set on a mean camber line to represent the mean camber line, and according to the thickness distribution design, two control parameters are set on thickness distribution to represent thickness distribution and used for adjusting the blade profile. The stacking line design is that the stacking line is expressed in a parameter form and is used for controlling the radial curvature of the blade to generate a straight blade and a bent and twisted blade; the characteristic section formed by the mean camber line and the thickness distribution is arranged according to a bending and twisting line formed by the radial installation angle and the stacking line, and the adjustable three-dimensional blade is generated. Through eight control parameters, an efficient bending and twisting combined axial flow turbine can be quickly generated through parametric modeling. The invention is wide in applicability, can be expanded to other turbomachinery, and has a great application prospect.

Description

technical field [0001] The invention belongs to the technical field of impeller machinery, and relates to a design method of an axial-flow turbine blade with skeleton forming, which is used for the development of an air turbine starter. Background technique [0002] There are various starting devices used on aircraft aeroengines, including electric starters, starter / generators, gas turbine starters, air turbine starters, hydraulic motors, etc. With the development of aerodynamic technology towards light weight and high efficiency, the requirements for starting devices are getting higher and higher. Due to the advantages of compact structure and large starting torque, air turbine starters have been widely used in the aviation field. As a key component of the flow efficiency, the performance of the axial flow turbine blade directly determines the efficiency and loss of the air turbine starter. Therefore, the high-efficiency axial flow turbine blade design technology is the c...

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Problems solved by technology

[0003] Through the research, it is found that for the axial flow turbine, the leakage air flow into the main flow area will cause mixing loss, which will also cause the deterioration of the secondary flow of the blade tip, and there is also a radial underflow, resulting in a high loss area; while the leakage air flow will suck the main flow area, reduce the action area of ​​the secondary flow, and reduce the high loss area

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