HEAT EXCHANGING SURFACE Russian patent published in 2018 - IPC F28F3/00 F15D1/10 

FIELD: heat-and-power engineering.

SUBSTANCE: invention relates to a power system, specifically to heat exchangers, cooling systems for industrial gas turbine power plants and aircraft engines. Heat exchange surface (1) contains separated recesses (2) with variable depth and width, each of which, in their longitudinal plane of symmetry, in the direction of movement of the external coolant flow, is made of two smoothly connecting in bottom part (14) of input divergent (7) and output convergent (8) areas. Recesses (2) in plan are made of confused forms from their input (3) to the output (4) edges connected by side walls (5) and (6) with an angle of confusion between them α=30°, and the longitudinal plane of symmetry of the grooves is rotated with an angle β=30°…45° relative to the direction of movement of the aforementioned external coolant flow. Input divergent area (7) occupies 1/3 of the length of recess (2) L to its maximum depth h and is connected by rounding to input edge (3) of the recess along its perimeter with a radius R_in=h, the ratio of the maximum depth of recess (2) to the hydraulic diameter d_g in terms of h/d_g in this area increases from zero to 0.44, output convergent area (8) is inclined at angle γ=22° to the initially smooth heat exchange surface (1), has a length equal to (2/3)L, is connected by rounding to input edge (4) of recess (2) along its perimeter with a radius R_out=0.25R_in, and the value of h/d_g in this area decreases from 0.44 to zero. Side walls of the grooves and the bottom part connecting them are concave with a radius of curvature R ≈ (4…6)R_in.

EFFECT: invention allows to increase the cooling efficiency of heat-stressed elements, to increase the resource of their work while simplifying the manufacturing technology and reducing costs in the production process.

5 cl, 4 dwg