JP2017116272A5 - - Google Patents

Description

According to the first aspect of the present invention, the molten salt permeation test apparatus includes a combustor that obtains combustion gas by mixing and burning compressed air and fuel, and a salt supply unit that supplies salt to the combustion gas. A receiving support for receiving and supporting a test piece whose surface is coated with a thermal barrier coating; an accelerator for accelerating the combustion gas supplied with the salt to collide with the test piece; and a back surface of the test piece And a cooling unit that blows and cools the refrigerant .
By comprising in this way, the combustion gas of a combustor can be used as a carrier gas of salt. Thereby, the salt heated by the combustion gas becomes a molten salt. Furthermore, the temperature of the test piece can be heated to a temperature equivalent to that of the actual turbine member.
Further, the combustion gas burned in the combustor containing the molten salt can be collided with the test piece after being accelerated by the accelerator. Thereby, the flow speed of combustion gas can be raised to the flow speed equivalent to the combustion gas of a real machine, using a small combustor. That is, the boundary condition of the thermal barrier coating of the test piece can be made equal to the boundary condition of the thermal barrier coating in the actual machine.
Furthermore, the base material of the test piece coated with the thermal barrier coating can be cooled. Therefore, the temperature distribution similar to the temperature distribution in the thickness direction of the turbine member of the actual machine can also appear on the test piece.
As a result, it is possible to correctly evaluate the penetration state of the molten salt with respect to the thermal barrier coating of the test piece while suppressing the increase in size.

According to a third aspect of the invention, the cooling unit definitive the first or second aspect, a plurality of holes for ejecting toward the supply pipe through which refrigerant supplied from the outside, the refrigerant from the supply pipe to the upper And an upper wall having at least one.

According to the seventh aspect of the present invention, in the molten salt infiltration test method, salt is supplied to a combustion gas obtained by mixing and burning compressed air and fuel, and the flow velocity of the combustion gas containing the salt is determined according to the flow path cross-sectional area. After accelerating by gradual decrease, the test piece is made to collide with a test piece having a thermal barrier coating on which the refrigerant is sprayed on the back surface .
By comprising in this way, a molten salt osmosis | permeation test can be performed in the environment equivalent to the turbine member of an actual machine using the apparatus sufficiently smaller than the actual machine of a gas turbine. Therefore, the thermal barrier coating can be easily and accurately evaluated.

The straight pipe portion 37 is formed with a length L such that the flow rate of the combustion gas G (hereinafter referred to as a gas flow rate) becomes a target value.
When the gas flow rate of the throttle 36 is “ F 1” and the gas flow rate of the straight pipe 37 is “ F 2”, the following equation (2) is established.
F1 / F2 = D2 / D1 (2)

Claims (7)

A combustor that obtains combustion gas by mixing and burning compressed air and fuel;
A salt supply unit for supplying salt to the combustion gas;
An accommodation support for accommodating and supporting a test piece whose surface is coated with a thermal barrier coating;
An accelerator that accelerates the combustion gas supplied with the salt to collide with the specimen;
A cooling unit that blows and cools a refrigerant on the back surface of the test piece; and
A molten salt permeation test apparatus. The salt supply unit includes:
The molten salt penetration test apparatus according to claim 1, further comprising a supply nozzle that supplies the salt to the accelerator. The cooling part is
A supply pipe through which an externally supplied refrigerant flows;
An upper wall having a plurality of holes for ejecting the refrigerant from the supply pipe upward;
At least comprising the molten salt penetration test apparatus according to claim 1 or 2. The accelerator is
A tubular throttling portion connected to the combustor and having a flow passage cross-sectional area gradually decreasing toward the downstream side in the flow direction of the combustion gas;
The straight pipe part which is formed in the straight pipe which has a fixed channel cross-sectional area, and connects between the downstream end part of the restricting part, and the accommodation support part. The molten salt penetration test apparatus as described. The combustor
The molten salt penetration test apparatus according to any one of claims 1 to 4, further comprising an air supply unit capable of supplying air for temperature adjustment to the combustion gas.   The molten salt permeation test apparatus according to any one of claims 1 to 5, wherein the accommodation support part includes an observation window that communicates with an accommodation space in which the test piece is accommodated. After supplying salt to the combustion gas burned by mixing compressed air and fuel, and accelerating the flow velocity of the combustion gas containing this salt by gradually reducing the cross-sectional area of the flow path , the refrigerant is blown to the back surface. A molten salt penetration test method in which a test piece coated with a thermal coating is made to collide.

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