A slotted structure designed according to the outlet velocity distribution of the gas film holes
A technology of outlet speed and air film holes, which is applied in the direction of mechanical equipment, blade support components, machines/engines, etc., can solve the difficulty of matching the processing and manufacturing process, structural strength and actual working conditions, has not been widely used, and covers cold air Small area and other problems, to achieve the effect of enhancing the covering effect of air film, enhancing the structural strength and reducing the difficulty of processing
Active Publication Date: 2019-09-27
HARBIN ENG UNIV
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Problems solved by technology
However, these holes have difficulties in processing and manufacturing technology, structural strength and matching of actual working conditions, and the above-mentioned hole types have not been widely used in engineering
The most commonly used cooling hole for film cooling is the cylindrical hole. The cylindrical hole has the advantages of simple structure, no influence on the strength of the blade, and easy processing, so it has been widely used in engineering. The disadvantages of low film cooling efficiency, small area covered by cold air, and not suitable for high blowing ratio are becoming more and more obvious.
Method used
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Embodiment Construction
[0020] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0021] combine Figure 1-5 , the present invention is a slotted structure designed according to the outlet velocity distribution of the air film hole. The air film cooling hole includes an inlet section 1 and a slotted pit section 2. The dimple section 2 is formed by connecting the cylindrical air film hole outlet section 5 reserved on the windward side and the dimple section 6 designed according to the injection speed of cold air downstream of the leeward side. The grooved pit section 2 is the outlet section 5 that retains the upstream windward side of the inlet section 1, and a new type of groove is opened upwards starting from the trailing edge of the exit of the cylindrical air film hole.
[0022] figure 2 It is a top view of the flow-through part of a grooved structure designed according to the velocity distribution of the air film hole exit of the present...
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The invention aims at providing a slotting structure designed based on air film hole outlet speed distribution. The slotting structure comprises an inlet section and a slotting pit section. The inlet section is a cylinder hole. The slotting pit section comprises a cylinder air film hole outlet section and a leeward face pit section which are mutually connected. The cylinder air film hole outlet section is connected with and communicates with the inlet section. The leeward face pit section is a trapezoid. A pit is formed in the lower plane of the trapezoid. A section of the pit comprises a semicircle and two tail edge prism frustums tangent to the semicircle. Each of the pit and the parts, on the two sides of the pit, of the leeward face pit section is provided with an air outlet. The outlet area of a leeward face air film hole is increased according to cold air ejection speed distribution, the cold air outlet momentum of the area is reduced, and the cold air coverage effect is improved; and through the downstream prism frustums, part of cold air is expanded towards the two transverse sides, and cold air utilization is more sufficient.
Description
technical field [0001] The invention relates to a cooling device for a gas turbine engine, in particular to a cooling device for high temperature components such as a gas turbine blade, an end wall and a combustion chamber. Background technique [0002] The operating temperature of modern gas turbine engines has far exceeded the withstand temperature of metallic materials. As an efficient advanced cooling method, film cooling is widely used in the cooling of high-temperature components of gas turbines and aero-engines. In a gas turbine engine, film cooling is to spray the compressed cooling gas extracted from the corresponding stage of the compressor from one or more discrete holes to form a gas film on the wall to protect the wall from being ablated by high-temperature gas. The level of film cooling efficiency directly affects the amount of compressed air required, which in turn affects the operating efficiency and performance of the gas turbine. Air film cooling is a pro...
Claims
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IPC IPC(8): F01D5/18F01D25/12
Inventor 姜玉廷郑群岳国强贾兴运田志涛
Owner HARBIN ENG UNIV