Novel bucket type air film cooling hole and design method thereof
A film cooling, bucket-type technology, applied in design optimization/simulation, mechanical equipment, instruments, etc., can solve the problem of high modeling cost, non-uniform shape of special-shaped film holes, and lack of guiding structure for special-shaped film holes Design methods and other issues, to achieve the effect of low geometric sensitivity, improved film cooling effect, and simple operation process
Active Publication Date: 2021-04-09
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
[0005]
In order to overcome the problems of inconsistent modeling methods of special-shaped air film holes in the prior art, high modeling cost, and lack of guiding structural design methods in engineering practice of special-shaped air film holes
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[0028]The expanded gas film hole is a simple processing method in the heterogeneous membrane hole, and the gas film cooling effect is better. At present, research on expanded gas membrane holes is often focused on a structural parameter or boundary condition for the impact of shaped cooling characteristics. The interaction between various structural parameters and its influence mechanism has not been fully studied, and expanded gas The influence between the various structural parameters of the membrane hole is intricate. In order to guide the engineering practice, the present invention summarizes the production and design method for the use of the bucket type gas film.
[0029]The present invention has a bucket type gas film cooling hole on the pressure surface and suction surface of the gas turbine engine blade, such asfigure 2 As shown, the cross-sectional shape of the processed bucket type gas film cooling hole is gradually transitioned by a cylindrical segment at the inlet and the ...
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The invention provides a novel bucket type air film cooling hole and a design method thereof. The section shape of the bucket type air film cooling hole is gradually transited into a bucket shape from a cylindrical section at an inlet through expansion in the spanwise direction and expansion in the flowing direction; seen from the side view direction, the section width of the air film cooling hole is not changed and then is gradually expanded from an inlet to an outlet; seen from the overlooking direction, the spanwise width of the air film cooling hole is remarkably increased from the inlet to the outlet, and the area of the outlet is larger than that of the inlet; and seen from the position over the outlet of the air film cooling hole, the inlet of the cooling hole is oval, and the outlet of the cooling hole is rectangular. During design, the geometrical parameters of the air film hole are calculated according to the mutual restriction relation between the geometrical parameters of the bucket type air film cooling hole, and a remarkable air film cooling effect can be obtained. The air film cooling hole can be formed at a time through laser drilling, the operation process is simple, the geometric sensitivity is low, no dead zone exists in the spanwise coverage area, and the air film cooling effect is remarkably improved.
Description
Technical field[0001]The present invention relates to the technical field of gas turbine engine, and in particular, a new bucket type gas film cooling hole and its design method to meet the gas turbine engine thermal load requirements.Background technique[0002]In order to meet the heat load cooling design requirements of the blade, the cylindrical membrane holes were initially used in air engine blades, and the overall and in-depth research of the cylindrical membrane holes at home and abroad. A large number of studies have shown that the cylindrical gas membrane can effectively prevent the turbine blades from being ablated from high temperature gas, but the cylindrical gas film hole is more concentrated, and it is easy to penetrate mainstream, which is difficult to adhere to the surface of the turbine blade, and the outer air film Hole can effectively weaken the air-conditioning flow method to direction, thereby obtaining a better gas film cooling effect. Through the design of a mo...
Claims
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IPC IPC(8): F01D5/18G06F30/17G06F30/20G06F119/14
CPCF01D5/186G06F30/17G06F30/20G06F2119/14Y02T50/60
Inventor 刘存良梁大鹏张帅旗张帆李冰然
Owner NORTHWESTERN POLYTECHNICAL UNIV