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Fan blade based on hollow metal/composite material structure

A technology of composite materials and fan blades, which is applied to components of pumping devices for elastic fluids, machines/engines, liquid fuel engines, etc., can solve the problems that metal wide-chord blades cannot meet strength and other design requirements, and achieve Structural shape and position can be designed strong, good casing tolerance, the effect of simple process

Inactive Publication Date: 2010-02-17
BEIJING DAINUOXINSI POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For high bypass ratio turbofan engine fan blades, solid metal wide-chord blades can no longer meet strength and other design requirements

Method used

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  • Fan blade based on hollow metal/composite material structure
  • Fan blade based on hollow metal/composite material structure
  • Fan blade based on hollow metal/composite material structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as Figure 4 The fan blade with wide chord and no shoulders is shown in the picture on the left. The shape of the blade has been aerodynamically designed to meet the overall performance requirements of the engine for fan components. The blades are discretized in space by using tetrahedral elements. The connection lines of the nodes of the tetrahedral elements are the ribs of the fan blades, and the node nodes of the elements are the connection points of the ribs. Figure 4 As shown on the right, Figure 5 It is a schematic diagram of the distribution of the rib structure 1 on the surface 2 of the fan blade. Fan blades are constructed from this hollow structural metal / composite framework, which is much less massive than solid metal blades.

[0031]Fan blades are subjected to centrifugal load during operation, and the centrifugal force gradually increases as the radius decreases, so the rib diameter must increase as the radius decreases to weaken the tensile stress...

Embodiment 2

[0036] A fan blade based on a hollow structure metal / composite material framework as in Embodiment 1, wherein the rib structure 1 is made of such as Figure 7 The diamond crystal structure shown is formed.

Embodiment 3

[0038] A fan blade based on a hollow structure metal / composite material framework as in Embodiment 1, wherein the rib structure 1 is made of such as Figure 8 The hexahedral unit structure shown is formed.

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Abstract

The invention discloses a fan blade based on a hollow metal / composite material structure. The inner base body of the fan blade is in a rib structure with discrete space. The fan blade comprises a hollow metal / composite material structure; the structure comprises a rib structure and inner holes; the rib structure is formed by combining and optimizing arbitrary space structures; the hole ratio is directly displayed by the space arranging mode of ribs and the rib diameter distribution; the rib structure and the surface of the blade are fixedly connected into a whole; the rib structure can be combined and optimized by a diamond structure, a tetrahedron unit structure, a hexahedron unit structure, a honeycomb structure or other arbitrary space structures; in regard to the space arrangement modeof the ribs and the rib diameter distribution, the rib diameters are gradually reduced and the space arrangement is gradually sparse following the radial increase of the blade along the radial direction of the blade; the thickness of the surface of the blade is controlled by pneumatic loads and technological conditions and the blade of the metal structure can be formed and processed quickly by high energy beams. The fan blade is directly and quickly formed and has simple technology. The structure shape has strong design performance.

Description

technical field [0001] The invention relates to a fan blade based on a hollow structure metal / composite material frame, in particular to a fan blade of a modern large bypass ratio and super large bypass ratio civil aeroengine, and belongs to the technical field of aeroengines and high-speed rotating machinery. Background technique [0002] The fan blades of modern civil large-bypass turbofan engines usually use a wide-chord design without intermediate shoulders, which is a design widely used in new-generation engines. Compared with narrow-chord blades with shoulders, wide-chord blades not only perform Good, efficient, with improvements in processing and strength. The centrifugal load of the fan blade is proportional to the square of the product of the mass distribution of the blade, the rotating speed and the radius where the mass distribution is located. The wide-chord blade increases the thickness of the blade due to the increase of the chord length, and the centrifugal lo...

Claims

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Application Information

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IPC IPC(8): F04D29/38F04D29/02
Inventor 徐力平邹正平弓三伟
Owner BEIJING DAINUOXINSI POWER TECH
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