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Turbine blade erosion tester

A technology of steam turbine blades and experimental devices, applied in the direction of using mechanical devices, measuring devices, testing wear resistance, etc., can solve problems such as not giving a clear quantitative relationship

Active Publication Date: 2008-03-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there have been some related studies in foreign literature, but no clear quantitative relationship has been given.

Method used

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  • Turbine blade erosion tester

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Embodiment Construction

[0009] The structural principle and working principle of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0010] Referring to Figure 1, it includes a DC motor control cabinet 1 and a DC motor 2 connected to the DC motor control cabinet 1. The DC motor 2 is used as a prime mover, and the DC motor control cabinet 1 controls the speed, start and stop of the DC motor 2, and the DC motor 2 The output end is connected with the gear speed increaser 4 through the flexible coupling 3, the cooling lubricating oil station 5 is installed on the gear speed increaser 4, and the gear speed increaser 4 drives the rotor 21 to rotate through another flexible coupling 20 , the rotor 21 is supported by two rolling bearings 6, and a closed cylinder 7 is set on the rotor 21. A wheel 8 fixedly connected with the rotor 21 is arranged in the cylinder 7, and a test piece 9 is symmetrically installed on the upper and lower outer edges of the...

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Abstract

The invention relates to a turbine blade water erosion test device which simulates the blade water erosion caused by the high-speed impact of water drip in a low-pressure cylinder of the turbine through the impact between the high-speed rotating blade and the water drip. A DC motor is used as a prime motor, and the rotary speed is improved through a gear speeder to drive a turntable provided with a test blade to rotate; a vibrator drives a nozzle connected with the water drip to produce the water drip, and the water drip axially moves to impact with a test piece; in addition, the system has also a vacuum-pumping system and a drainage system in order to ensure the normal operation of the test. The test device can study the change relations of deformation action and crack growth condition of the turbine blade materials with various factors under the high-speed impact of liquid drip, and provides the basic test data for deeply knowing the impact mechanism of high-speed liquid and solid and the water erosion protection of the turbine blade.

Description

technical field [0001] The invention relates to a material water erosion test device, in particular to a steam turbine blade water erosion test device. Background technique [0002] The inlet of modern high-power steam turbines is high-temperature and high-pressure superheated steam. Due to steam expansion and work, it has become wet steam in the low-pressure cylinder (especially the last few stages of flow). At this time, the wet vapor pressure and density are very small, and the mass percentage of water is about 5-15%. Due to the large mass flow rate of the high-power steam turbine, the steam volume flow rate of the low-pressure blade stage group is large, so longer blades are required to provide a larger flow area. The diameter of the final blade of a 900MW steam turbine has reached 4.2m, and the blade tip speed is 660m / s. The collision of such a high-speed blade with the liquid droplets in the wet steam will cause blade erosion. With the further development of supercri...

Claims

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Application Information

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IPC IPC(8): G01N3/56G01N19/00G01N17/00
Inventor 谢永慧韩永强汪勇张荻
Owner XI AN JIAOTONG UNIV
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