JP6901899B2 - High temperature blast erosion test method and high temperature blast erosion test equipment - Google Patents

Description

The present invention relates to a high-temperature blast erosion test method for evaluating erosion resistance by spraying solid particles heated to a high temperature by combustion gas onto a test piece, and a high-temperature blast erosion test apparatus for carrying out this test method. Is.

In structural members such as boiler heat transfer tubes of coal-fired power plants, erosion occurs when high-temperature gases containing powder such as combustion ash collide for a long period of time. Such structural members are required to have long-term stability and long-term reliability, and it is also necessary to suppress an increase in repair costs. In order to predict the amount of erosion of these structural members in a high temperature environment, it is extremely important to carry out a high temperature blast erosion test before putting them into the actual machine to understand the wear damage characteristics.

Patent Document 1 describes a high-temperature erosion corrosion testing apparatus including a gas heater, a powder feeder, a mixer for mixing powder and gas, a test container for colliding the mixture with a test piece, and the like. There is. In this document, a gas body that collides with a test piece is heated by passing it through a gas heater coil tube surrounded by a heater.

In Patent Document 2, a supply unit for supplying the carrier gas and a heating unit for heating are provided in the carrier gas flow path, and the carrier gas is heated to a predetermined temperature in advance and then collides with the test piece from the nozzle together with the powder at a high temperature. Blast erosion test equipment is described. In this test apparatus, the carrier gas is heated by passing it through a flow path tube surrounded by a heater in the heating section.

Patent Document 3 describes a combustor in which compressed air and fuel are mixed and burned to obtain combustion gas, a supply unit for supplying erodant to the combustion gas, and a test piece whose surface is coated with a heat shield coating. Described is an erosion test apparatus including a containment support for accommodating and supporting, and an accelerator for accelerating combustion gas containing an erodanant to collide with a test piece. In this test device, the combustion gas is used as the carrier gas of the erodant, which heats the temperature of the test piece to the same temperature as the turbine member of the actual machine, accelerates the combustion gas containing the erodant, and causes it to collide with the test piece. There is.

The erosion test apparatus of Patent Document 4 is designed to inject small particles into a combustion gas made of high-temperature air and a flammable gas, and inject the small particles from a nozzle into a specimen.

Jikkai Sho 63-6341 Japanese Unexamined Patent Publication No. 8-62114 JP-A-2016-90533 Jikkai Sho 62-97941

In the erosion test, it is desirable to perform it in a temperature environment suitable for the actual machine in order to improve the test accuracy. Regarding the temperature adjustment of the high temperature gas that collides with the test piece, as described above, in the apparatus of Patent Document 1, the gas is heated by passing it through a gas heater coil tube surrounded by a heater, and in the apparatus of Patent Document 2, the gas is heated. It is heated through a flow path tube surrounded by a heater, and both devices in both documents only indirectly heat the gas. Therefore, it is difficult to raise the temperature of the gas to a temperature suitable for the actual machine, the temperature of the gas cannot be adjusted, and the test accuracy of the erosion amount measurement in a high temperature environment is low.

The devices of Patent Document 3 and Patent Document 4 both use combustion gas into which powder is introduced, and particles can be made to collide with a test piece at a high temperature. Further, regarding the temperature control of the combustion gas, in the apparatus of Patent Document 3, the temperature of the heat shield coating layer of the test piece is adjusted by increasing or decreasing the supply amount of the temperature adjusting air sent to the combustion gas. In the apparatus of Patent Document 4, the temperature of the combustion gas in the flame guide tube communicating with the nozzle is detected, and based on this signal, the air and the flammable gas that generate the combustion gas are controlled and injected into the specimen. The temperature of the combustion gas is kept constant.

In order to achieve the development of high-quality structural members, it is desirable to control the temperature of the test piece that collides with the particles more accurately, but in both of these devices, the temperature of the combustion gas is controlled by adjusting the air supply amount. I'm just doing it. Further, although the temperature of the combustion gas can be controlled, the combustion gas containing particles continuously hits a part of the test piece. Therefore, the temperature of the test piece rises rapidly, and it is difficult to accurately control the temperature of the test piece.

Therefore, in view of the problems of the prior art, it is an object of the present invention to provide a high temperature blast erosion test method and a high temperature blast erosion test apparatus capable of measuring the amount of erosion in a high temperature environment with high accuracy.

The high-temperature blast erosion test method of the present invention is a high-temperature blast erosion test method in which solid particles are introduced into an acceleration nozzle that accelerates and injects combustion gas, and the combustion gas containing the solid particles is blown onto a test piece, and is a temperature control device. While heating the test piece, the acceleration nozzle and the test piece are relatively moved in the direction of the spray surface of the test piece in an amplitude range exceeding the spray surface, and the acceleration nozzle moves the test piece to the test piece. It is characterized in that the temperature of the test piece is kept constant by blowing a combustion gas containing solid particles.

According to the high-temperature blast erosion test method of the present invention, the test piece is heated by the temperature control device, and at the same time, the acceleration nozzle and the test piece are relatively moved in an amplitude range exceeding the spray surface to perform the test from the acceleration nozzle. The piece is sprayed with a combustion gas containing the solid particles. That is, since the combustion gas injected from the acceleration nozzle intermittently collides with the test piece, the temperature of the test piece can be kept constant, and the erosion amount can be measured with high accuracy. In the high temperature blast erosion test in which the acceleration nozzle is fixed, it is difficult to control the temperature of the test piece only by the temperature control device. The reason is that there is heat input from the combustion gas injected from the acceleration nozzle, and the temperature of the test piece changes rapidly beyond the temperature control capacity of the temperature control device, so the temperature of the test piece is kept constant. I can't control it. Therefore, in the present invention, it is possible to keep the temperature of the test piece under test constant by combining the temperature control by the temperature control device and the method of blowing the combustion gas while moving the acceleration nozzle.

Before introducing the solid particles, the test piece may be heated by a temperature control device and a combustion gas containing no solid particles may be blown to perform preheating to raise the temperature of the test piece to the test temperature. preferable.

It is preferable that the spray angle of the solid particles on the test piece is variable. In this case, the test can be carried out in an environment more suitable for the actual machine.

The spraying speed of the solid particles on the spraying surface is preferably 100 to 1300 m / s. As a result, it is possible to obtain an appropriate evaluation according to various actual machine environments.

The temperature of the test piece is preferably adjusted to 100 to 900 ° C. As a result, it is possible to obtain an appropriate evaluation according to various actual machine environments.

The combustion gas can be produced by high pressure gas and fuel. If the high-pressure gas is a combustion-supporting gas, the temperature of the combustion gas can be adjusted by the combustion ratio of the combustion-supporting gas and the fuel. Further, the injection speed of the combustion gas can be adjusted by the combustion ratio of the combustion-supporting gas and the fuel.

The high-temperature blast erosion test apparatus of the present invention has a combustion unit, an injection unit, and a supply port into which solid particles can be introduced, and accelerates the combustion gas while injecting the solid particles to collide with the test piece. The injection device having a nozzle, the temperature control device for heating and holding the test piece, the acceleration nozzle, and the test piece are relatively moved in an amplitude range exceeding the spray surface in the direction of the spray surface of the test piece. It is characterized by including a drive mechanism that keeps the temperature of the test piece constant.

According to the high-temperature blast erosion test apparatus of the present invention, solid particles are contained while the test piece is heated and held by the temperature control device and the acceleration nozzle and the test piece are relatively moved in an amplitude range exceeding the spray surface by the drive mechanism. Spray the combustion gas onto the test piece. That is, the combustion gas containing the solid particles injected from the acceleration nozzle intermittently collides with the test piece, so that the temperature of the test piece can be kept constant and the erosion amount can be measured with high accuracy.

It is preferable to provide an angle control mechanism that changes the spraying angle of the solid particles onto the test piece. In this case, the test can be carried out in an environment more suitable for the actual machine.

The structure of the acceleration nozzle is preferably one having a reduced diameter portion for narrowing the passage area of the combustion gas. The combustion gas can be accelerated by narrowing the range through which the combustion gas passes and then opening it to expand the volume.

The temperature control device has a heating source capable of heating and holding the test piece, and it is preferable that a heat dissipation suppression cover is provided so as to surround the heating source and the test piece. In this case, the temperature of the test piece can be maintained at a high temperature, and the test can be performed in an environment more suitable for the actual machine.

According to the present invention, in addition to temperature control by the temperature control device, the temperature of the test piece can be kept constant by intermittently colliding the combustion gas containing solid particles injected from the acceleration nozzle with the test piece. It is possible to measure the amount of erosion with high accuracy in a high temperature environment.

It is a schematic diagram of the high temperature blast erosion test apparatus which concerns on one Embodiment of this invention. It is sectional drawing of the acceleration nozzle. It is a schematic perspective view which shows the state of a high temperature blast erosion test. It is a schematic cross-sectional view which shows the state which the test piece is placed on the heater of a temperature control device. (A) is a graph showing the temperature history when the heat dissipation suppression cover is not provided, and (b) is a graph showing the temperature history when the heat dissipation suppression cover is provided. It is explanatory drawing explaining the state which the acceleration nozzle reciprocates around the spraying surface. It is a graph which shows the result of the high temperature blast erosion test. The gas velocity, particle velocity, and O / F ratio of each test piece are shown in a graph. It is a graph which shows the temperature history about the test piece 3. It is a graph which shows the temperature history about the test piece 4.

An embodiment of the present invention will be described. FIG. 1 is a schematic view of a high temperature blast erosion test apparatus 1 according to an embodiment of the present invention. The high-temperature blast erosion test device 1 is for carrying out a blast erosion test of the test piece 50 in a high-temperature environment, and heats and holds the temperatures of the injection device 3 provided with the acceleration nozzle 2 and the test piece 50. It is mainly composed of a temperature control device 4, a drive mechanism 6 for moving the acceleration nozzle 2 in a predetermined direction, and an angle control mechanism 7 for changing the spraying angle θ of solid particles on the test piece 50.

The type of the test piece 50 of the present embodiment is not limited. For example, a square plate made of SUS304 steel formed to a predetermined thickness can be evaluated. The surface of the test piece 50 may be subjected to surface treatment such as thermal spraying. When the surface is treated, the surface of the test piece 50 after the surface treatment becomes the spray surface 50f, which is the test surface of the blast erosion test.

FIG. 2 is a cross-sectional view of the acceleration nozzle 2. The acceleration nozzle 2 is formed in a cylindrical shape as a whole, and has a combustion unit 8 in which combustion gas is generated, a gas supply port 30 for introducing high-pressure gas (combustible gas), a fuel supply port 31 for introducing fuel, and the like. An ignition plug 32 that generates combustion gas from fuel, a reduced diameter portion 11 that accelerates the combustion gas 60, a powder injector 9 that introduces solid particles into the combustion gas generated by the combustion portion 8, and an accelerated combustion gas 60 are injected. It is composed of an injection unit 10 extending in the axial direction.

High-pressure gas is introduced from the gas supply port 30 and fuel is introduced from the fuel supply port 31 into the combustion unit 8, and combustion gas is generated at the combustion unit 8. The reduced diameter portion 11 for accelerating the combustion gas is formed at the outlet of the combustion portion 8. The inner diameter of the reduced diameter portion 11 is smaller than the inner diameter of the combustion portion 8 and the injection portion 10. The combustion gas 60 is accelerated by temporarily narrowing the passage area of the combustion gas 60 at the reduced diameter portion 11 and then opening the diameter-reduced portion 11 to expand the volume. Solid particles are introduced from the powder injector 9 into the accelerated combustion gas 60. The combustion gas 60 into which the solid particles are introduced is injected from the tip thereof through the injection unit 10 toward the spray surface 50f of the test piece 50. In this way, the combustion gas 60 containing the solid particles is made to collide with the spray surface 50f at high speed.

As used herein, the term "high pressure gas" follows the definition of Article 2 of the High Pressure Gas Safety Act. Examples of the high-pressure gas used include flammable gas (for example, acetylene and propane), but it is not necessary to use flammable gas if fuel is to be added separately. On the other hand, when using flammable gas (for example, oxygen, air), a separate fuel is required, but the speed and temperature of the combustion gas can be adjusted by the combustion ratio of the flammable gas and fuel, so high temperature blasting This combination is particularly suitable for performing erosion tests.

Examples of the fuel include acetylene, propane, propylene, hydrogen, natural gas, methane, ethylene, hydrocut and the like for gaseous fuels, and kerosene and the like for liquid fuels.

Solid particles are hard particles (erodeant) that can wear the surface of the test piece. Examples of the material of the solid particles include metals and ceramics, and among them, oxide ceramics, carbide ceramics, boride ceramics, and nitride ceramics are particularly preferable. Examples of the shape of the solid particles include a spherical shape, an amorphous shape, a polygonal shape, and the like, and a polygonal shape is particularly preferable. The particle size of the solid particles may be in the range of 1 to 1000 μm, and is preferably in the range of 45 to 200 μm from the viewpoint of transportability. As the hardness of the solid particles, those having a Vickers hardness HV of 100 or more are preferable.

FIG. 3 is a schematic perspective view showing a state of a high temperature blast erosion test. In the high temperature blast erosion test apparatus 1 of the present embodiment, the test piece is oriented in the direction of the spray surface of the test piece 50 with the acceleration nozzle 2 facing the test piece 50 by the drive mechanism 6 for moving the acceleration nozzle 2 in a predetermined direction. It is possible to move relative to 50. The acceleration nozzle 2 reciprocates around the test piece 50 in one direction (y direction) in the spray surface (xy plane) direction of the test piece 50. At that time, the acceleration nozzle 2 is set to reciprocate in an amplitude range exceeding the spray surface 50f of the test piece 50 while keeping the distance from the test piece 50 constant.

The high-temperature blast erosion test apparatus 1 of the present embodiment includes an angle control mechanism 7 of an acceleration nozzle 2 for varying the spraying angle θ of solid particles on the test piece 50. The spraying angle θ by the angle control mechanism 7 is an angle formed by the spraying surface 50f of the test piece 50 and the direction in which the solid particles are ejected from the acceleration nozzle 2 (see FIG. 1). The spraying angle θ by the angle control mechanism 7 can be changed in the range of 0 ° to 180 °, and solid particles can be sprayed at a wide range of angles.

The temperature control device 4 that raises the temperature of the test piece 50 has a heating source capable of heating and holding the test piece 50. The heating source is a plate-shaped heater 15 capable of directly heating the test piece 50.

FIG. 4 is a schematic cross-sectional view showing a state in which the test piece 50 is placed on the heater 15. A recess 15a for positioning the test piece 50 is formed on the upper portion of the heater 15, and the test piece 50 is placed in contact with the recess 15a. An electrode 16 electrically connected to the heater power supply, a thermocouple 17 for the heater, and the like are connected to the heater 15, and the heater power supply and the thermocouple 17 for the heater are electrically connected to the control unit.

A thermocouple 18 for a test piece, which is electrically connected to a control unit, is connected to the back side of the test piece 50. Based on the detection signal of the thermocouple 18 for the test piece and the detection signal of the thermocouple 17 for the heater, the control unit switches on / off the power supply to the heater 15 by the heater power supply, and the temperature of the test piece 50 is set. Control so that it is near the test temperature. The test piece 50 is directly heated by such a temperature control device 4, and the temperature of the test piece 50 under test is made more stable.

A plurality of columns 21 are fixed on the base 20, and the heater 15 is supported by these columns 21 via the holding member 27. A columnar heat insulating block 22 is provided on the base 20. The heat insulating block 22 is made of a material having a large heat capacity such as heat-resistant steel or stainless steel, and is arranged under the heater 15 to suppress heat dissipation from the heater 15. A heat dissipation suppression cover 23 that suppresses heat dissipation from the heater 15 and the test piece 50 is provided so as to surround the heater 15 and the test piece 50. The main purpose of providing the heat dissipation suppression cover 23 is to suppress heat dissipation of the heater 15 and improve the accuracy of temperature control of the test piece 50.

The heat dissipation suppression cover 23 has a cylindrical side cover 24 fixed on the base 20 and installed around the heater 15, and a disk shape fixed to the upper end of the side cover 24 and located above the heater 15. The upper cover 25 is composed of a disk-shaped heater cover 26 provided on the lower side of the upper cover 25 and on the upper side of the heater 15. The shape and dimensions of the heat dissipation suppression cover 23, side cover 24, top cover 25, heater cover 26, etc. are not limited.

The side cover 24 is located on the outer peripheral side of the test piece 50, the heater 15, the heater cover 26, the heat retaining block 22, and the plurality of columns 21, and covers each of these members from the side. The upper cover 25 is located above the test piece 50, the heater 15, the heater cover 26, the heat retaining block 22, and the plurality of columns 21, and covers each of these members from above with a test area open.

A side wall 26a extending downward in FIG. 4 is formed on the peripheral edge of the heater cover 26 so as to surround the side of the heater 15. The heater cover 26 covers the heater 15 from the side and above with the test area open. A step portion 26b is formed on the inner peripheral edge of the heater cover 26. The peripheral edge of the test piece 50 is pressed from above by the step portion 26b, and the test piece 50 is fixed.

By providing the heat dissipation suppression cover 23, the heat dissipation of the heater 15 is suppressed, the temperature of the test piece 50 can be maintained at a high temperature, and the test can be performed at a temperature close to the actual machine environment. The top cover 25 can prevent other structural members, such as the heater cover 26, from being damaged by the collision of high pressure combustion gas containing solid particles. As a result, the life of the test device 1 can be extended. Since the mounting member (not shown) for mounting the heater cover 26 is covered with the upper cover 25 and the side cover 24, damage to the mounting member due to the collision of the combustion gas 60 containing solid particles can be prevented. Further, the heater cover 26 fixing the test piece 50 can be removed, so that the test can be carried out efficiently and economically.

The test results demonstrating the effect of the heat dissipation suppression cover are shown. FIG. 5A is a graph showing the temperature history when the heat dissipation suppression cover 23 is not provided, and FIG. 5B is a graph showing the temperature history when the heat dissipation suppression cover 23 is provided. The test conditions are as shown in Table 1. As shown in these graphs, the temperature of the heater 15 dropped significantly before the heat dissipation measures without the heat dissipation suppression cover 23, but after the heat dissipation measures with the heat dissipation suppression cover 23, the heat dissipation of the heater 15 was remarkable. By being suppressed, the temperature decrease was suppressed and the temperature control accuracy was remarkably improved.

FIG. 6 is an explanatory diagram illustrating a state in which the acceleration nozzle reciprocates on the spray surface 50f of the test piece 50. The arrow 70 in the left-right direction indicates the movement of the acceleration nozzle. The acceleration nozzle 2 reciprocates in one direction (y direction) of the spray surface (xy plane) of the test piece 50 with the test piece 50 as the center in an amplitude range exceeding the spray surface 50f of the test piece 50. In this way, a linear test mark having a certain width remains at the portion of the spray surface 50f where the combustion gas is sprayed.

If the combustion gas 60 is continuously applied to one place on the spray surface 50f of the test piece 50 or only within the range within the spray surface 50f of the test piece 50, the combustion gas 60 is locally applied to the spray surface 50f. The temperature of the test piece 50 cannot be adjusted accurately because it collides with the gas. On the other hand, in the method of the present embodiment, the acceleration nozzle is reciprocated in an amplitude range exceeding the spray surface 50f of the test piece 50, and the combustion gas containing solid particles is sent to the inside of the spray surface, the outside of the spray surface, the inside of the spray surface, and the like. By spraying out of the spray surface in this order, the spray surface 50f is intermittently collided. The amplitude range and reciprocating speed of the accelerating nozzle are set according to the test conditions such as the test temperature, the size of the test piece, the temperature of the combustion gas, the speed of the solid particles, and the distance between the accelerating nozzle and the test piece 50. As a result, the temperature of the test piece 50 can be kept constant, and extremely high test accuracy can be obtained. The temperature fluctuation of the test piece during the test is preferably 40 ° C. or lower, more preferably 15 ° C. or lower. At the stage before the introduction of the solid particles, which is before the start of the above step, the test piece 50 is heated by the temperature control device 4 and the combustion gas containing no solid particles is sprayed onto the spray surface 50f to form the test piece 50. Preheat to raise the temperature to the test temperature.

The angle control mechanism 7 provided in the high temperature blast erosion test apparatus 1 can change the spray angle θ of the solid particles ejected from the acceleration nozzle 2 with respect to the spray surface 50f of the test piece 50 in a wide range according to the environment of the actual machine. it can.

The spraying speed of the high-temperature solid particles ejected from the acceleration nozzle 2 with respect to the spraying surface 50f is preferably adjusted to 100 to 1300 m / s in consideration of the assumed actual machine environment and the reliability of speed measurement. The spraying speed is adjusted by the inner diameter of the injection portion 10 of the acceleration nozzle 2, the inner diameter of the reduced diameter portion 11, the magnitude of the pressure of the combustion gas, and the like. As a result, the spraying speed of the blast erosion test can be changed in a wide range, and an appropriate evaluation can be obtained according to various actual machine environments. The spraying speed of solid particles can be measured by a particle velocity measuring device (for example, "Accuraspray-G3C" manufactured by Tecnar Automation Ltd.).

The temperature of the test piece 50 is preferably adjusted to 100 to 900 ° C. in consideration of the assumed actual machine environment. The temperature of the test piece 50 is adjusted by the temperature of the combustion gas injected from the acceleration nozzle 2, the set temperature of the temperature control device 4, the amplitude range of the acceleration nozzle 2, the reciprocating speed, and the like. As a result, the test temperature can be changed in a wide range, and an appropriate evaluation can be obtained according to various actual machine environments.

Regarding the combustion gas generated by the high-pressure gas and the fuel in the combustion unit 8, if the high-pressure gas is a combustion-supporting gas, the temperature of the combustion gas can be adjusted by the combustion ratio of the combustion-supporting gas and the fuel. .. Further, the injection speed of the combustion gas can be adjusted by the combustion ratio of the combustible gas and the fuel.

According to the high temperature blast erosion test apparatus 1 and the test method of the present embodiment, the following effects can be obtained. First, before introducing the solid particles, the test piece 50 is preheated with the combustion gas containing no solid particles injected from the temperature control device 4 and the acceleration nozzle 2 until the test piece 50 approaches the test temperature. At this time, the acceleration nozzle 2 is reciprocated in one direction in the direction of the spray surface of the test piece 50 in an amplitude range exceeding the spray surface 50f around the test piece 50. If the acceleration nozzle 2 is reciprocated from the time of preheating and solid particles are introduced into the acceleration nozzle 2 at an appropriate timing, the main test can be started continuously as it is. A high-temperature blast erosion test is performed by spraying the combustion gas 60 containing the solid particles onto the spray surface 50f of the test piece 50. During the test, the temperature of the test piece 50 can be kept constant by the temperature control by the temperature control device 4 and the intermittent collision of the combustion gas 60, and the amount of erosion on the surface of the test piece 50 is measured with high accuracy. be able to.

A high temperature blast erosion test was performed using the high temperature blast erosion test apparatus 1 and the test method of the above embodiment. Two 48 mm × 48 mm × 10 mm SS400 steel materials were prepared as test pieces, and one of them was surface-treated by thermal spraying. The test conditions for each test piece are as shown in Table 2.

FIG. 7 shows the results of the high temperature blast erosion test. In this test, the test piece 1 (SS400 steel + carbide cermet) with the sprayed coating formed on the surface and the test piece 2 (SS400 steel) without the sprayed coating on the surface were compared to blast the sprayed film with high temperature resistance. This is a test for confirming erosion. Regarding the temperature dependence, the effect of reducing the amount of wear by the sprayed coating was confirmed in both the temperature environments of 300 ° C. and 500 ° C., and the effect of reducing the amount of wear at 500 ° C. was particularly large. On the other hand, regarding the angle dependence, when the spray angles of the solid particles were 30 ° and 45 °, the reduction in the amount of wear due to the sprayed coating was clear, but in the case of 90 °, the amount of wear was equivalent or rather increased. .. From the above, it was shown that the sprayed coating used in this test has a difference in the effect of improving the high temperature blast erosion resistance depending on the angle. In this way, according to this test, it was possible to investigate the degree of wear due to the difference in temperature and the difference in angle, and it was possible to predict the amount of erosion in the assumed usage environment.

Next, a test was conducted to investigate the effect on the temperature history due to the presence or absence of preheating and the magnitude of the amplitude. Two new SS400 steel materials of 48 mm × 48 mm × 10 mm were prepared as test pieces. The test conditions for the test piece 3 and the test piece 4 are as shown in Table 3. The collision angle with the spray surface was 45 °. FIG. 8 is a graph showing the gas velocity, particle velocity, and equivalent ratio (O / F ratio) of oxygen and kerosene of each test piece.

FIG. 9 is a graph showing the temperature history of the test piece 3, and FIG. 10 is a graph showing the temperature history of the test piece 4. 9 (a) shows the test results with preheating and large amplitude, (b) shows no preheating and large amplitude, (c) shows preheated and small amplitude, and (d) shows preheated and 0 amplitude. Similarly, FIG. 10A shows test results with preheating and large amplitude, (b) shows no preheating and large amplitude, (c) shows preheating and small amplitude, and (d) shows preheating and amplitude 0. is there. Here, as shown in the upper right of the graph, a large amplitude means that the acceleration nozzle is reciprocating in an amplitude range exceeding the spray surface of the test piece, and a small amplitude means that the acceleration nozzle is placed in the spray surface of the test piece. It is in a state of continuing to apply only to the range that fits. Amplitude 0 is a state in which the acceleration nozzle is not moved after preheating and is continuously applied to one point on the test piece.

From the comparison of (a) and (b) in each figure, the temperature rise after the start of the test is large without preheating. From the comparison of (a) and (c) in each figure, it is recognized that when the amplitude is small, the temperature rises sharply immediately after the start of the test and the temperature cannot be maintained. Also in the comparison of (a) and (d) in each figure, it is recognized that when the amplitude is 0, the temperature rises more rapidly immediately after the start of the test, and the temperature cannot be maintained. From the comparison of (c) and (d) in each figure, it is recognized that the temperature rise after the start of the test is slightly smaller when the amplitude is set to be smaller than when the amplitude is set to 0.

As can be seen from (a) and (b) of each figure having a large amplitude, the temperature of the test piece is adjusted by reciprocating the acceleration nozzle in an amplitude range exceeding the spray surface and intermittently colliding with the spray surface. Can be kept constant. As a result, extremely high test accuracy can be obtained.

The present invention is not limited to the above embodiments and examples. In the above embodiment, the acceleration nozzle is moved with the test piece fixed, but conversely, the test piece may be moved with the acceleration nozzle fixed. Also in this case, the test piece may be moved in one direction with respect to the acceleration nozzle in an amplitude range exceeding the spray surface in the direction of the spray surface of the test piece. Further, the acceleration nozzle or the test piece may be moved not only in one direction but also in multiple directions to keep the temperature of the test piece constant. Further, in the above embodiment, the angle on the acceleration nozzle side is variable, but the angle on the test piece side may be variable. Further, in the above embodiment, the heating of the test piece by the heater is directly heated, but indirect heating or induction heating may be used.

1 High temperature blast erosion test device 2 Acceleration nozzle 3 Injection device 4 Temperature control device 6 Drive mechanism 7 Angle control mechanism 8 Combustion part 9 Powder injector 10 Injection part 11 Reduced diameter part 30 Gas supply port 31 Fuel supply port 32 Spark plug 15 Heater 16 Electrode 17 Thermocouple for heater 18 Thermocouple for test piece 20 Base 21 Strut 22 Heat insulation block 23 Heat dissipation suppression cover 24 Side cover 25 Top cover 26 Heater cover 50 Test piece 50f Spray surface 60 Combustion gas

Claims (12)

A high-temperature blast erosion test method in which solid particles are introduced into an acceleration nozzle that accelerates and injects combustion gas, and the combustion gas containing the solid particles is sprayed onto a test piece.
While heating the test piece with a temperature control device that heats and holds the test piece, the acceleration nozzle and the test piece are relatively moved in an amplitude range exceeding the spray surface in the direction of the spray surface of the test piece. , by blowing a combustion gas containing said solid particles from the accelerating nozzle on the specimen, holding Chi the temperature of the specimen to be constant,
The high temperature blast erosion test method , wherein the relative movement is a reciprocating movement of the acceleration nozzle or the test piece. Claim that before introducing the solid particles, the test piece is heated by a temperature control device and a combustion gas containing no solid particles is blown to preheat the test piece to raise the temperature of the test piece to the test temperature. The high temperature blast erosion test method according to 1. The high-temperature blast erosion test method according to claim 1 or 2, wherein the spray angle of the solid particles on the test piece is variable. The high-temperature blast erosion test method according to any one of claims 1 to 3, wherein the spray rate of the solid particles on the spray surface is 100 to 1300 m / s. The high temperature blast erosion test method according to any one of claims 1 to 4, wherein the temperature of the test piece is adjusted to 100 to 900 ° C. The high-temperature blast erosion test method according to any one of claims 1 to 5, wherein the combustion gas is generated by high-pressure gas and fuel. The high-temperature blast erosion test method according to claim 6, wherein the high-pressure gas is a combustion-supporting gas, and the temperature of the combustion gas is adjusted by the combustion ratio of the combustion-supporting gas and the fuel. The high-temperature blast erosion test method according to claim 6 or 7, wherein the high-pressure gas is a combustion-supporting gas, and the injection speed of the combustion gas is adjusted by the combustion ratio of the combustion-supporting gas and the fuel. An injection device having a combustion unit, an injection unit, and a supply port for introducing solid particles, and having an acceleration nozzle for accelerating and injecting combustion gas to cause the solid particles to collide with a test piece.
A temperature control device that heats and holds the test piece, and
A drive mechanism that keeps the temperature of the test piece constant by relatively moving the acceleration nozzle and the test piece in the direction of the spray surface of the test piece in an amplitude range exceeding the spray surface.
Equipped with a,
A high-temperature blast erosion test apparatus , wherein the relative movement is a reciprocating movement of the acceleration nozzle or the test piece. The high-temperature blast erosion test apparatus according to claim 9, further comprising an angle control mechanism for varying the spraying angle of the solid particles onto the test piece. The high-temperature blast erosion test apparatus according to claim 9 or 10, wherein the acceleration nozzle has a reduced diameter portion for narrowing the passage area of the combustion gas. The temperature control device has a heating source capable of heating and holding the test piece.
The high-temperature blast erosion test apparatus according to any one of claims 9 to 11, wherein a heat dissipation suppression cover is provided so as to surround the heating source and the test piece.

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