A salt spray dynamic thermal corrosion test bench for blade specimens based on micro gas turbines

Abstract

The object of the present invention is to provide a blade specimen salt spray dynamic thermal corrosion test bench based on a micro gas turbine, comprising a micro gas turbine, a blade test section and an exhaust gas discharge section connected in sequence, wherein the blade test section comprises a gas-salt spray mixing pipeline, a salt water supply pipeline and a blade specimen loading platform, wherein the gas-salt spray mixing pipeline is located behind the micro gas turbine, the salt water supply pipeline is located outside the gas-salt spray mixing pipeline, and a salt spray filter device and a salt spray nozzle are respectively installed thereon, the salt spray filter device is located outside the gas-salt spray mixing pipeline, the salt spray nozzle is located inside the gas-salt spray mixing pipeline, and the blade specimen loading platform is located inside the gas-salt spray mixing pipeline, and a test blade specimen is installed thereon. This test bench can simulate the actual blade working condition to the maximum extent, and the test blade specimen is located downstream of the micro gas turbine, so as to avoid the corrosion of the blade causing the change of the working condition of the gas turbine, thereby improving the stability of the experimental environment.

Description

Technical Field

[0001] The invention relates to a test bench, in particular to a salt spray test bench. Background Art

[0002] Corrosion is the damage or deterioration of blades or their performance caused by the environment. Most corrosion occurs in the atmospheric environment because the atmosphere contains oxygen. When the physical environment (humidity, temperature) changes, pollutants with corrosive components and clothing factors will corrode the blades, which is usually called atmospheric corrosion of the blades. Salt spray corrosion is a common and most destructive atmospheric corrosion. Because salt spray is an atmosphere containing chlorides, its main corrosive component is sodium chloride.

[0003] At present, the simulated high-temperature salt spray test device generally places the workpiece to be tested in a salt spray test chamber. It cannot apply load to the workpiece to be tested, and cannot accurately test the salt spray corrosion resistance of the workpiece to be tested in a high-temperature salt spray environment and under stress. Summary of the invention

[0004] The purpose of the present invention is to provide a blade specimen salt spray dynamic thermal corrosion test bench based on a micro gas turbine, which can load different blades in a high temperature environment and study the salt spray corrosion of the blades when they are under load.

[0005] The object of the present invention is achieved in that:

[0006] The present invention discloses a blade specimen salt spray dynamic thermal corrosion test bench based on a micro gas turbine, which is characterized by comprising a micro gas turbine, a blade test section and an exhaust gas discharge section which are connected in sequence, wherein the blade test section comprises a gas-salt spray mixing pipeline, a salt water supply pipeline and a blade specimen loading platform, wherein the gas-salt spray mixing pipeline is located behind the micro gas turbine, the salt water supply pipeline is located outside the gas-salt spray mixing pipeline, a salt spray filter device and a salt spray nozzle are respectively installed thereon, the salt spray filter device is located outside the gas-salt spray mixing pipeline, the salt spray nozzle is located inside the gas-salt spray mixing pipeline, the blade specimen loading platform is located inside the gas-salt spray mixing pipeline, and a test blade specimen is installed thereon.

[0007] The present invention may also include:

[0008] 1. The exhaust gas discharge section includes an annular air intake cooling duct, a diffuser shell, a motor, and a shaft. The annular air intake cooling duct is located behind the gas-salt spray mixing duct. The diffuser shell is installed in the annular air intake cooling duct. The motor and the shaft are installed in the diffuser shell. The motor is connected to the shaft, and the shaft is connected to the blade specimen loading platform.

[0009] 2. A cyclone spoiler support plate is installed at the air inlet of the annular air intake cooling duct. The cyclone spoiler support plate has an inclination angle with the axis of the annular air intake cooling duct and is wider at the top and narrower at the bottom.

[0010] 3. The front end of the annular air intake cooling duct is a tapered structure, and the rear end forms a diffuser tube structure with the diffuser shell.

[0011] 4. The test blade specimen is installed on the blade specimen loading platform through the quadrilateral slots. The number of the quadrilateral slots is 12. The bottom of the slot is wider than the slot opening and has an inclination angle with the gas-salt spray mixing pipe.

[0012] The advantages of the present invention are: the experimental platform can simulate the actual working conditions of the blades to the maximum extent, and study the dynamic thermal corrosion of the blades in salt spray under the condition of high temperature and high speed under the action of the motor, and the experimental blade specimens are located downstream of the micro gas turbine to avoid the corrosion of the blades and cause changes in the working conditions of the gas turbine, thereby improving the stability of the experimental environment. At the same time, the quadrilateral slot makes it easy to replace the experimental blade specimens, simple to maintain, convenient for multiple experiments, and reduces the experimental cost, thereby obtaining relevant laws and conclusions under the dynamic thermal corrosion of the blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention;

[0014] Figure 2 This is the overall appearance diagram of the present invention;

[0015] Figure 3 is a schematic diagram of the blade test section;

[0016] Figure 4 It is a schematic diagram of a salt spray filter device, a salt water supply pipeline and a salt spray nozzle;

[0017] Figure 5 is a schematic diagram of the blade specimen loading platform;

[0018] Figure 6 is a schematic diagram of the exhaust gas discharge section;

[0019] Figure 7 It is a schematic diagram of the annular air intake cooling duct and the cyclone spoiler support plate;

[0020] Figure 8 Schematic diagram of the cyclone spoiler support. DETAILED DESCRIPTION

[0021] The present invention is described in more detail below with reference to the accompanying drawings:

[0022] Combination Figure 1-8The test bench includes: a micro gas turbine 1, a blade test section 2 and an exhaust gas discharge section 3. The blade test section includes: a salt spray filter 2.1, a salt water supply pipeline 2.2, a salt spray nozzle 2.3, a blade specimen loading platform 2.4, a gas-salt spray mixing pipeline 2.5, and an experimental blade specimen 2.6; the exhaust gas discharge section includes: an annular air intake cooling pipeline 3.1, a diffuser shell 3.2, a motor 3.3, a shaft 3.4, and a cyclone spoiler support plate 3.5.

[0023] The cyclone spoiler support plate 3.5 is installed on the annular air intake cooling duct 3.1, located after the blade specimen loading platform 2.4, downstream of the cold air intake, with an inclined angle to the axis, wide at the top and narrow at the bottom, and has the functions of spoiler mixing, supporting and connecting.

[0024] The annular air intake cooling duct 3.1 is installed behind the gas-salt spray mixing duct 2.5 and on the diffuser shell 3.2. The front end tapered structure has the function of introducing the external low-temperature protective air, and the tail end and the diffuser shell 3.2 form a diffuser tube structure.

[0025] The blade specimen loading platform 2.4 is connected to the shaft 3.4 and is located in the gas-salt spray mixing pipeline 2.5 and in front of the diffuser shell 3.2. There are 12 quadrilateral slots evenly distributed on the circumference. The bottom of the slot is wider than the slot mouth and has an inclination angle with the axis. The experimental blade specimen 2.6 is loaded and rotated by the shaft 3.4 during operation.

[0026] The motor 3.3 is installed inside the diffuser shell 3.2 to protect the motor 3.3.

[0027] The original tail nozzle of the micro gas turbine is cancelled, so that the high-temperature gas directly enters the gas-salt spray mixing pipeline 2.5.

[0028] The blade test section 2 and the exhaust gas discharge section 3 are designed in four sections and are connected by flanges and screws and nuts for easy installation. The first flange is located in front of the salt spray filter 2.1, the brine supply pipeline 2.2 and the salt spray nozzle 2.3; the second flange is located behind the blade specimen loading platform 2.4 and the experimental blade specimen 2.6; the third flange is located behind the cyclone spoiler support plate 3.5.

[0029] When the test bench is working, the experimental blade specimen 2.6 is loaded on the blade specimen loading platform 2.4 through the quadrilateral slot, and is driven to rotate by the motor 3.3 to simulate the actual working conditions. The upstream micro gas turbine 1 provides stable high-temperature gas. The high-temperature gas is mixed with the salt mist sprayed by the salt mist nozzle 2.3 in the gas-salt mist mixing pipe 2.5, and enters the blade test section after being fully mixed. The experimental blade specimen 2.6 is corroded by the high-temperature salt mist in a high-speed dynamic environment. Then the high-temperature gas enters the exhaust gas discharge section, and the external low-temperature protective air is drawn through the annular air intake cooling pipe 3.1 and is fully turbulently mixed and cooled by the cyclone spoiler support plate 3.5, and the low-temperature exhaust gas is discharged to avoid high-temperature accidents in the experiment.

Claims

1. A salt spray dynamic thermal corrosion test bench for blade specimens based on a micro gas turbine, characterized by: It comprises a micro gas turbine, a blade test section and an exhaust gas discharge section which are connected in sequence, wherein the blade test section comprises a gas-salt spray mixing pipeline, a salt water supply pipeline and a blade specimen loading platform, wherein the gas-salt spray mixing pipeline is located behind the micro gas turbine, the salt water supply pipeline is located outside the gas-salt spray mixing pipeline, and a salt spray filter and a salt spray nozzle are respectively installed thereon, the salt spray filter is located outside the gas-salt spray mixing pipeline, the salt spray nozzle is located inside the gas-salt spray mixing pipeline, and the blade specimen loading platform is located inside the gas-salt spray mixing pipeline, and a test blade specimen is installed thereon; The tail gas discharge section includes an annular air intake cooling pipeline, a diffuser shell, a motor, and a shaft. The annular air intake cooling pipeline is located behind the gas-salt spray mixing pipeline. The diffuser shell is installed in the annular air intake cooling pipeline. The motor and the shaft are installed in the diffuser shell. The motor is connected to the shaft, and the shaft is connected to the blade specimen loading platform. A cyclone spoiler support plate is installed at the air inlet of the annular air intake cooling duct. The cyclone spoiler support plate has an inclined angle with the axis of the annular air intake cooling duct and is wider at the top and narrower at the bottom. The front end of the annular air intake cooling duct is a tapered structure, and the rear end forms a diffuser tube structure with the diffuser shell.

2. The salt spray dynamic thermal corrosion test bench for blade specimens based on a micro gas turbine according to claim 1 is characterized by: The test blade specimen is installed on the blade specimen loading platform through a quadrilateral slot on the blade specimen loading platform. The number of the quadrilateral slots includes 12. The bottom of the slot is wider than the slot opening and has an inclination angle with the gas-salt spray mixing pipe.

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