CN-115752982-B - High-temperature damping blade vibration simulation testing device and operation method thereof

CN115752982BCN 115752982 BCN115752982 BCN 115752982BCN-115752982-B

Abstract

The invention discloses a high-temperature damping blade vibration simulation test device and an operation method thereof, wherein the high-temperature damping blade vibration simulation test device comprises a test bed base; the device comprises a test bed base, a support frame, a blade fixing frame, a shroud positive pressure loading device, an exciting force loading device, a heating device and a measurement control device, wherein the support frame is arranged on the test bed base, the blade fixing frame is used for fixedly mounting a damping blade to be tested, the shroud positive pressure loading device is used for fixing and loading positive pressure on a shroud area of the damping blade to be tested, the exciting force loading device is used for loading exciting force on the damping blade to be tested, the heating device is used for heating the blade area, and the measurement control device is used for controlling and adjusting the positive pressure loading, the exciting force loading and the heating temperature so as to realize the vibration simulation test of the high-temperature damping blade. The invention can simulate the vibration response of the damping blade when the damping blade is subjected to certain positive pressure, exciting force and thermal load, and can provide important data and theoretical guidance for the research on the vibration characteristics of the damping blade of high-temperature turbine machinery.

Inventors

ZHANG DI
CHEN YOUXIANG
ZHU GUANGYA
ZHANG ZUOYUAN
LIU ZHUFENG
XIE YONGHUI

Assignees

西安交通大学

Dates

Publication Date: 20260505
Application Date: 20221130

Claims (9)

1. A high temperature damped blade vibration simulation test device, comprising: the test bed base (1) is used as a support base of the high-temperature damping blade vibration simulation test device; the support frame (2) is fixedly arranged on the test bed base (1), and the support frame (2) is provided with a first chute; the blade fixing frame (5), the blade fixing frame (5) is fixedly arranged on the test bed base (1), and the blade fixing frame (5) is used for fixedly mounting a damping blade to be tested; The shroud positive pressure loading device is movably arranged in the first chute of the support frame (2) and is used for fixing and loading positive pressure on the shroud area of the damping blade to be tested; The exciting force loading device is movably arranged in the first chute of the support frame (2) and is used for loading exciting force to the damping blade to be tested; The heating device is fixedly arranged on the test bed base (1) or the blade fixing frame (5) and is used for packaging the blade area of the damping blade to be tested into the inside and heating the blade area; The measuring control device is used for controlling and adjusting the positive pressure loading of the shroud positive pressure loading device, the exciting force loading of the exciting force loading device and the heating temperature of the heating device to realize the high-temperature damping blade vibration simulation test; The shroud positive pressure loading device includes: The mounting side plate is used for being movably mounted in the first sliding groove of the support frame (2); The positive pressure loading disc (16) is fixedly arranged on the mounting side plate, and the positive pressure loading disc (16) is provided with a through hole which is used for penetrating through the shroud zone of the damping blade to be tested; The arc-shaped chute (17) is fixedly arranged on the positive pressure loading disc (16) around the through hole; The positive pressure applying devices are multiple in number and all the positive pressure applying devices are arranged in the arc-shaped chute (17) in a sliding manner and are used for fixing and loading positive pressure on the shroud zone of the damping blade to be tested; The positive pressure applying device comprises a positive pressure applying rod (21), wherein the positive pressure applying rod (21) is provided with a static force sensor (20) for measuring the positive pressure loading size, the rear end of the positive pressure applying rod (21) is provided with an adjusting bolt (18) for adjusting the positive pressure applying size, and the front end of the positive pressure applying rod (21) is provided with a heat insulating sheet (22) and a heat-resistant jacking block (23).
2. The high-temperature damping blade vibration simulation test device according to claim 1, wherein the specific structure of the support frame (2) provided with the first chute is that, The support frame (2) is provided with a chute in the vertical direction, the chute is provided with fixed mounting holes at a plurality of preset different height positions, and the fixed mounting holes are used for fixedly mounting the shroud positive pressure loading device or the exciting force loading device.
3. A high temperature damped blade vibration simulation test apparatus according to claim 1, wherein said blade holder (5) comprises: the mounting bracket is fixedly arranged on the test bed base (1); a blade root clamp fixing block (10), wherein the blade root clamp fixing block (10) is fixedly arranged on the mounting bracket; the blade root clamp limiter (11), and the blade root clamp limiter (11) is fixedly arranged on the blade root clamp fixing block (10); and the blade root clamp (12), and the blade root clamp (12) is fixedly arranged on the blade root clamp limiter (11).
4. A high temperature damped blade vibration simulation test device according to claim 3, wherein a thermal insulation plate (7) is further provided between the blade root clamp fixing block (10) and the blade root clamp limiter (11).
5. The device according to claim 1, wherein the exciting force loading means comprises: The vibration exciter support (24) is used for being movably arranged in the first sliding groove of the support frame (2), and the vibration exciter support (24) is provided with a second sliding groove; The vibration exciter chassis (25) is movably arranged in the second chute of the vibration exciter bracket (24), and the vibration exciter chassis (25) is provided with a third chute; The vibration exciter (26) is movably arranged in a third chute of the vibration exciter chassis (25), a dynamic force sensor (28) is arranged on a vibration exciting rod of the vibration exciter (26), and the vibration exciting rod is used for loading vibration exciting force of the to-be-detected damping blade in the heating device.
6. The device for simulating vibration of a high temperature damped blade of claim 5, wherein the excitation rod of the exciter is a flexible variable cross-section connecting rod.
7. The high-temperature damping blade vibration simulation test device according to claim 1, wherein the heating device comprises a resistance heating furnace (30) and a high-temperature gas through-flow system.
8. The high-temperature damping blade vibration simulation test device according to claim 5, wherein the measurement control device comprises a signal generator (41), a power amplifier (42), a thermocouple (43), a data acquisition unit (40), a data processing workstation (39), a high-temperature strain gauge (44), a laser reflection coating (45) and a laser Doppler vibrometer (46); The signal generator (41) generates a signal which is used for being led into the vibration exciter (26) through the power amplifier (42) so as to realize the adjustment of exciting force, the thermocouple (43) is used for being arranged on the surface of the heating device so as to realize the measurement of the temperature of the test environment, and the data collector (40) is used for collecting and acquiring the positive pressure measured by the static force sensor (20) and the exciting force measured by the dynamic force sensor (28); The high-temperature strain gauge (44) is fixedly arranged at different preset positions of the damping blade to be tested, the high-temperature strain gauge (44) is connected with the data acquisition device (40), the laser reflection coating (45) is arranged at different preset positions of the damping blade to be tested, and the laser Doppler vibration meter (46) is used for measuring vibration displacement of the laser reflection coating (45) area; The data collector (40) is connected to the data processing station (39).
9. A method of operating the high temperature damped blade vibration simulation test apparatus of claim 1, comprising the steps of: Fixedly mounting a damping blade to be tested on a blade fixing frame, and placing the damping blade to be tested in a heating device so that the natural frequency measured in a free state of the blade is consistent with the frequency obtained by numerical analysis in a full constraint state of a blade root; After the temperature field of the heating device is stable, fixing and positive pressure loading are carried out on the shroud zone area of the damping blade to be tested through the shroud positive pressure loading device, exciting force loading is carried out on the damping blade to be tested through the exciting force loading device, vibration response of the blade under a certain contact surface positive pressure load and a certain exciting frequency is obtained through measurement, a vibration frequency response curve of the blade under a certain contact surface positive pressure load under a high temperature load is obtained, and vibration frequency response curves of the blade under the action of a plurality of different contact surface positive pressure loads under the high temperature load are obtained; And calculating the modal damping ratio of the blade according to the frequency response curve under each working condition, and analyzing the damping characteristics of the blade damping shroud under different positive pressure loads.

Description

High-temperature damping blade vibration simulation testing device and operation method thereof Technical Field The invention belongs to the technical field of experimental devices, relates to the field of vibration simulation test, and in particular relates to a high-temperature damping blade vibration simulation test device and an operation method thereof. Background The turbine, gas turbine and other equipment are power units critical in the fields of electric power industry, industrial manufacturing industry, ship driving and the like, the safety and reliability of the power units are critical to economic safety, and operation practice experience shows that damage of turbine blades is a main cause of failure of rotating machinery such as the turbine, the gas turbine and the like, and vibration fatigue of the blades is a main cause of damage of the blades. In order to improve the vibration safety of the blade, the conventional turbine blade is generally designed with damping structures, and vibration energy is dissipated through dry friction action between the damping structures, so that the vibration stress of the blade is reduced. With the increasing economic requirements of turbomachinery such as gas turbines, large-scale nuclear turbines, ultra-supercritical turbines and the like, the working temperature of the turbomachinery is also increased continuously, so that the initial inlet temperature of turbine blades is increased obviously. Under the background, the turbine blade is often required to work in a high-temperature environment, and the high-temperature environment can influence the overall material performance of the damping blade, so that the material characteristics, the working mechanism and the vibration reduction effect of the damping structure are influenced, and the safety and the stability of fatigue resistance of the blade are threatened. At present, the existing researches on the vibration performance of the damping blade are mostly carried out in normal temperature environment, the researches on the vibration performance of the damping blade in high temperature environment are not enough, and a learner does not build a vibration test platform of the damping blade in high temperature environment, so that a damping blade vibration simulation test device in high temperature environment is needed to be built. Disclosure of Invention The invention aims to provide a high-temperature damping blade vibration simulation test device and an operation method thereof, which are used for solving one or more technical problems. The technical scheme provided by the invention can simulate the blade vibration response of the damping blade under the action of certain positive pressure, exciting force and thermal load, and can provide important data and theoretical guidance for the research on the vibration characteristics of the damping blade of the high-temperature turbine machinery. In order to achieve the above purpose, the invention adopts the following technical scheme: The invention provides a high-temperature damping blade vibration simulation test device, which comprises: the test bed base is used as a support base of the high-temperature damping blade vibration simulation test device; the support frame is fixedly arranged on the test bed base and is provided with a first chute; The blade fixing frame is fixedly arranged on the test bed base and is used for fixedly mounting a damping blade to be tested; The shroud positive pressure loading device is movably arranged in the first chute of the support frame and is used for fixing and loading positive pressure on the shroud area of the damping blade to be tested; The exciting force loading device is movably arranged in the first chute of the support frame and is used for loading exciting force to the damping blade to be tested; The heating device is fixedly arranged on the test bed base or the blade fixing frame and is used for packaging the blade area of the damping blade to be tested into the test bed base or the blade fixing frame and heating the blade area; And the measurement control device is used for controlling and adjusting the positive pressure loading of the shroud positive pressure loading device, the exciting force loading of the exciting force loading device and the heating temperature of the heating device so as to realize the high-temperature damping blade vibration simulation test. The invention further improves that the concrete structure of the support frame provided with the first chute is that, The support frame is provided with a chute in the vertical direction, the chute is provided with fixed mounting holes at a plurality of preset different height positions, and the fixed mounting holes are used for fixedly mounting the shroud positive pressure loading device or the exciting force loading device. A further improvement of the present invention is that the blade holder comprises: the mounting bracket is fixedly arranged on