High efficiency array jet cooling structure

Abstract

The invention belongs to the field of cooling of gas turbines and aircraft engine high-temperature components as well as others related to array impact jet cooling, and particularly discloses a high efficiency array jet cooling structure. The high efficiency array jet cooling structure is characterized in that three types of array jet impact hole structural design and one type of cone-shaped rib structural design are provided: a convergent jet impact opening plate with the plurality of openings being in array arrangement, an impact opening plate with the plurality of openings different in pore diameters being in array arrangement, an impact opening plate with the chamfered openings being in array arrangement and a jet target plate with the upper cone-shaped ribs being in array arrangement. The high efficiency array jet cooling structure has the benefits as follows: the purpose of improving the cooling efficiency to the greatest extent by using the minimum cooling air amount is achieved, the overall temperature gradient of the cooling wall is reduced, and a more uniform and stable heat transfer effect is achieved.

Description

Technical field: [0001] The invention belongs to the cooling of high-temperature components of gas turbines and aeroengines and other fields related to array impingement jet cooling, and specifically relates to a high-efficiency array jet cooling structure. Background technique: [0002] The key technology to improve the thermal efficiency of the gas turbine is to increase the inlet temperature of the turbine rotor. Now the gas temperature of the first-stage moving blade of the gas turbine has reached above 1800K. , transition section, turbine blade, etc.) cannot work at such a high temperature for a long time, and effective cooling technology must be adopted. [0003] At present, the development trend of gas turbines is to increase the temperature rise and reduce the emission of pollutants, both of which require a large increase in the proportion of air used in the combustion chamber of the gas turbine, resulting in a decrease in the proportion of cooling air used for the h...

AI Technical Summary

Problems solved by technology

There is no way to significantly increase the Reynolds number of the impinging jet

[0007] (2) In the existing array jet cooling system, the effective cooling area is four times the range of the impact hole, and the boundary layer of the jet target plate wall in other areas is thicker, and the heat transfer effect is not good

[0008] (3) After the impinging jet impacts the target plate, a certain amount of cross flow will be generated on the wall of the target plate, and the cross flow will affect the rear jet flow, causing the rear impact jet flow to deviate, resulting in uneven cooling temperature of the target plate. A large temperature gradient is generated, which affects the service life of the material

Images