Additive airfoil heat exchanger

1. A heat exchanger comprising:

a heat exchanger core, wherein the heat exchanger core comprises:

a first fin;

a second fin spaced apart from the first fin;

a primary passage defined between the first fin and the second fin and extending through the heat exchanger core; and

a plurality of airfoils extending through the first fin, the primary passage, and the second fin, wherein at least one airfoil of the plurality of airfoils comprises:

a plurality of secondary passages, wherein the plurality of secondary passages extends through the heat exchanger core within the at least one airfoil transverse to the primary passage; and

a crossbar within at least one of the plurality of secondary passages.

2. The heat exchanger of claim 1 , wherein the heat exchanger core further comprises:

a first side;

a second side opposite the first side;

a third side extending from the first side to the second side;

a fourth side opposite the third side and extending from the first side to the second side;

a fifth side extending from the first side to the second side and extending from the third side to the fourth side; and

a sixth side opposite the fifth side extending from the first side to the second side and extending from the third side to the fourth side,

wherein the first fin and the second fin both extend from the first side to the second side and extend from the fifth side to the sixth side, and

wherein the primary passage extends from the first side to the second side and from the fifth side to the sixth side.

3. The heat exchanger of claim 2 wherein the heat exchanger core further comprises:

a primary inlet on the first side of the heat exchanger core; and

a primary outlet on the second side of the heat exchanger core, wherein the primary passage extends from the primary inlet to the primary outlet.

4. The heat exchanger of claim 3 , wherein each of the plurality of airfoils comprises:

a base at the fourth side of the heat exchanger core;

a tip at the third side of the heat exchanger core; and

a height spanning from the base to the tip.

5. The heat exchanger of claim 4 , wherein each of the plurality of airfoils comprises:

a leading edge extending along the height of each airfoil of the plurality of airfoils;

a trailing edge opposite the leading edge and extending along the height of each airfoil of the plurality of airfoils; and

a chord length spanning from the leading edge to the trailing edge.

6. The heat exchanger of claim 5 , wherein each of the plurality of airfoils comprises:

a pressure side extending between the leading edge and the trailing edge and extending along the height of each airfoil of the plurality of airfoils;

a suction side opposite the pressure side and extending between the leading edge and the trailing edge and extending along the height of each airfoil of the plurality of airfoils; and

a thickness spanning from the pressure side to the suction side.

7. The heat exchanger of claim 6 , wherein each of the plurality of airfoils is positioned so that the leading edge faces the primary inlet and the trailing edge faces the primary outlet.

8. The heat exchanger of claim 7 , wherein the heat exchanger further comprises:

a header on the third side of the heat exchanger core, wherein the header comprises:

an inlet;

a plenum; and

an outlet, wherein the plenum is fluidically between the inlet of the header and the outlet of the header, and the outlet of the header is fluidically connected to at least one of the plurality of secondary passages.

9. The heat exchanger of claim 8 , wherein the first fin and the second fin are corrugated.

10. The heat exchanger of claim 5 , wherein a first airfoil of the plurality of airfoils has a pressure side facing the fifth side and a suction side facing the sixth side, and a second airfoil of the plurality of airfoils has a pressure side facing the sixth side and a suction side facing the fifth side.

11. A heat exchanger comprising:

a heat exchanger core, wherein the heat exchanger core comprises:

a first fin extending in a first direction and extending in a second direction;

a second fin extending in the first direction and extending in the second direction, and spaced apart from the first fin in a third direction;

a primary passage extending between the first fin and the second fin from a primary inlet to a primary outlet; and

a plurality of airfoils extending through the first fin, the primary passage, and the second fin, wherein each airfoil of the plurality of airfoils comprises:

a plurality of secondary passages, wherein the plurality of secondary passages comprises:

a first secondary passage with a first cross-sectional profile;

a second secondary passage with a second cross-sectional profile, wherein the second cross-sectional profile is different from the first cross-sectional profile; and

an internal wall segregating the first secondary passage from the second secondary passage, wherein the internal wall comprises a zig-zag profile; and

a header, wherein the header comprises:

an inlet;

a plurality of outlets; and

a plenum between the inlet and the plurality of outlets of the header, wherein the plurality of outlets are fluidically connected to the at least one secondary passage of each airfoil of the plurality of airfoils.

12. The heat exchanger of claim 11 , wherein the first fin and the second fin are both corrugated.

13. The heat exchanger of claim 12 , wherein each of the plurality of airfoils comprises:

a leading edge facing the primary inlet of the heat exchanger core; and

a trailing edge facing the primary outlet of the heat exchanger core.

14. The heat exchanger of claim 13 , wherein at least one secondary passage of the plurality of secondary passages comprises a crossbar within the at least one secondary passage.

15. The heat exchanger of claim 12 , wherein the first fin and the second fin are corrugated as the first fin and the second fin extend in the second direction.

16. The heat exchanger of claim 15 , wherein the heat exchanger core comprises:

a first side;

a second side opposite the first side;

a third side extending from the first side to the second side;

a fourth side opposite the third side extending from the first side to the second side;

a fifth side extending from the first side to the second side and extending from the third side to the fourth side; and

a sixth side opposite the fifth side extending from the first side to the second side and extending from the third side to the fourth side,

wherein the primary inlet is on the fifth side and the primary outlet is on the sixth side.

17. The heat exchanger of claim 16 , wherein each of the plurality of airfoils comprises:

a leading edge facing the primary inlet of the heat exchanger core; and

a trailing edge facing the primary outlet of the heat exchanger core.

18. The heat exchanger of claim 17 , further comprising:

a first airfoil of the plurality of airfoils, wherein the first airfoil comprises:

a pressure side extending between the leading edge and the trailing edge of the first airfoil and along a height of the first airfoil; and

a suction side opposite the pressure side between the leading edge and the trailing edge and along the height of the first airfoil, wherein the pressure side of the first airfoil faces the first side of the heat exchanger core and the suction side of the first airfoil faces the second side of the heat exchanger core; and

a second airfoil of the plurality of airfoils, wherein the second airfoil comprises:

a pressure side extending between the leading edge and the trailing edge of the second airfoil and along a height of the second airfoil; and

a suction side opposite the pressure side of the second airfoil and between the leading edge of the second airfoil and the trailing edge of the second airfoil and along the height of the second airfoil, wherein the pressure side of the second airfoil faces the second side of the heat exchanger core and the suction side of the second airfoil faces the first side of the heat exchanger core.