US 12,006,846 B2
Additively manufactured intermediate duct for disposition between a low-pressure compressor and a high-pressure compressor, and corresponding manufacturing method
Ralf Homburg, Dachau (DE); and Harsimar Sahota, Unterschleissheim (DE)
Assigned to MTU Aero Engines AG, Munich (DE)
Appl. No. 16/759,489
Filed by MTU Aero Engines AG, Munich (DE)
PCT Filed Oct. 31, 2018, PCT No. PCT/DE2018/000319
§ 371(c)(1), (2) Date Aug. 12, 2020,
PCT Pub. No. WO2019/086065, PCT Pub. Date May 9, 2019.
Claims priority of application No. 102017010129.9 (DE), filed on Nov. 2, 2017.
Prior Publication US 2023/0203960 A1, Jun. 29, 2023
Int. Cl. F01D 1/00 (2006.01); F01D 9/06 (2006.01)
CPC F01D 9/065 (2013.01) [F05D 2230/00 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An intermediate duct for disposition between an outlet of a low-pressure compressor and an inlet of a high-pressure compressor of a turbomachine, the intermediate duct comprising:
an outer wall;
an inner wall;
at least strut disposed between the outer wall and the inner wall and extending radially with respect to a central axis of the intermediate duct;
the intermediate duct at least partially manufactured by additive manufacturing;
the strut having a surface with a curvature with respect to a plane defined by the radial and axial directions so as to define an out-of-plane curvature in the circumferential direction;
wherein a radial shape of the at least one strut lies within a first boundary contour and a second boundary contour, at least in the region of a trailing edge, the first boundary contour being defined by the formula (I):
y=71.14x5−179.74x4+134.76x3−2.6539x2−27.72x+5.5815  (I)
and the second boundary contour being defined by the formula (II):
y=71.14x5−179.74x4+134.76x3−2.6539x2−27.72x+1.5815  (II),
where x denotes the percentage of the radial height of the strut from the inner wall of the intermediate duct in the region of its trailing edge, and y denotes the deviation, in degrees, in the circumferential direction from a hypothetical linear trailing edge contour having a constant radial shape at 0°.