Experimental device for vibration reduction characteristics of sawtooth triple-mounted crowned blades
An experimental device and saw-tooth-shaped technology, applied in the field of aero-engines, can solve the problems that the engineering applicability of theoretical analysis results is difficult to be verified, and achieve the effect of reasonable structure
Active Publication Date: 2016-05-04
BEIHANG UNIV
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Problems solved by technology
At present, scholars at home and abroad have carried out theoretical analysis and experimental verification on the vibration reduction law of shrouded blades, and have achieved certain results, but most of them are theoretical and mechanism studies. Due to the differences between theoretical assumptions and actual models, the results of theoretical analysis It is difficult to verify the engineering applicability of
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[0021] The present invention will be further described below in conjunction with the drawings.
[0022] The present invention is a zigzag triple-mounted crowned blade vibration damping characteristic experiment device, which includes a crowned blade 1, a clamping mechanism 2 and a loading mechanism 3. figure 1 Shown.
[0023] Among them, the crown 101 of the crowned blade 1 adopts a zigzag structure, and the pre-twist angle and contact angle of the crown 101 are designed according to experimental needs; the blade body 102 adopts a flat structure, and the top of the blade body 102 is vertically fixed to the bottom surface of the crown 101 ; In order to ensure the verticality and rigidity of the blade body 102 and the blade crown 101, the tip of the blade body 102 is inserted through the opening on the blade crown 101 and fixed by spot welding; the three crowned blades 1 are arranged vertically and are clamped The holding mechanism 2 is fixed, and after being fixed, the three adjacen...
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The invention discloses a damping characteristic experiment device for a saw-toothed triple-mounted shrouded blade, which is used for researching the damping characteristics of the shrouded blade at different contact angles and pre-twisting angles and under different contact positive pressures. The damping characteristic experiment device comprises shrouded blades, a clamping mechanism and a loading mechanism, wherein three shrouded blades are arranged vertically; the integral tip shrouds of the blades are the same in height, and are in tight contact with one another after being fixed via the clamping mechanism; the loading mechanism is arranged above the clamping mechanism; the loading mechanism comprises a loading disk and friction blocks; the loading disk is arranged horizontally, and is provided with an integral tip shroud outlet through which the integral tip shrouds of the three shrouded blades extend; two friction blocks are positioned on left side and the right side of the integral tip shroud outlet; and the two friction blocks are fixed on the loading disk, and one ends of the two friction blocks are contacted with the friction surfaces of the integral tip shrouds in respective adjacent shrouded blades after fixing. The damping characteristic experiment device has the advantages of reasonable structure and capability of realizing damping characteristic measurement of the shrouded blades under different key parameters.
Description
Technical field [0001] The invention relates to the field of aeroengines, in particular to an experimental device for the damping characteristics of a zigzag triple-mounted crowned blade in an aeroengine to obtain the damping characteristics of the crowned blade. Background technique [0002] In aeroengines, turbine blades are one of the important parts. In addition to being subjected to the impact of high temperature and high pressure gas during work, the blades also experience high cycle fatigue vibration due to cyclic loads such as centrifugal force and aerodynamic force. In order to reduce the vibration stress of the engine blade, in addition to avoiding the blade resonance and improving the fatigue resistance of the blade material, the damping of the blade system must also be increased. At present, the effect of dry friction damping is the most obvious. Its advantages are simple structure and strong environmental adaptability. Dry friction damping uses the friction between ...
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IPC IPC(8): G01M13/00
Inventor 樊江徐雨生韩乐
Owner BEIHANG UNIV