COMBINED COOLING METHOD OF HEAT-STRESSED COMPONENTS (VERSIONS) Russian patent published in 2013 - IPC F23R3/16 

FIELD: machine building.

SUBSTANCE: combined cooling method of heat-stressed components made in the form of a perforated plate separating the cooling and heating media consists in the fact that the cooling medium is supplied in the form of jets under pressure that exceeds the pressure in heating medium flow through a system of holes made in the perforated plate. At the specified distance from the initial perforated plate on the side of the cooling medium there installed is an additional perforated plate, the total surface area of dosing holes of which is less than the total surface area of outlet holes of the initial perforated plate. First, cooling medium is supplied under action of the same pressure differential between cooling and heating media through the system of dosing holes of the additional perforated plate, which leads to its jet flow onto heat release surface of the initial perforated plate. Then, cooling medium is supplied in the form of jets to the heating medium flow at a lower speed in comparison to the flow velocity of cooling medium jets from the dosing holes of the additional perforated plate by passing it through the system of outlet holes of the initial perforated plate. In the other version of the method's implementation, at the specified distance from the initial perforated plate on the side of the heating medium there installed is an additional non-permeable plate, the length of which is less than the length of the initial perforated plate. The cooling medium is separated into two portions; one portion of the cooling medium is supplied in the form of jets through that system of dosing holes of the perforated plate, which are enveloped with the additional non-permeable plate, which leads to jet flow of the cooling medium onto the heat release surface of the additional non-permeable plate. Then, convective flow of the cooling medium is restricted by its being supplied only in the direction of the heating medium flow in the form of a near-wall film along the heat release surface of the non-permeable plate in a channel formed with both plates; interaction of the convective flow with jets of the cooling medium leads to gradual increase in its thickness within the length of the additional plate. Length of the additional non-permeable plate is restricted at the point where thickness of the increasing convective layer of the cooling medium is less than or equal to the distance between the plates. Beyond the additional plate, the convective flow of the cooling medium is directed along the surface of the perforated plate in the form of a near-wall enclosing film, into which the other portion of the cooling medium is supplied in the form of flooded jets through the rest dosing holes of the perforated plate.

EFFECT: increasing cooling efficiency of a heat-stressed component, reducing the cooling medium flow rate, reducing pressure losses in the heating medium flow and temperature unbalance of the initial plate.

8 cl, 5 dwg