EXHAUST PIPE ARRANGEMENT FOR DISCHARGING EXHAUST FROM A COMBUSTION ENGINE
An exhaust pipe arrangement for discharging exhaust from a combustion engine through an exhaust pipe is provided, particularly for a combustion engine with an exhaust gas aftertreatment system requiring high temperatures in one or more operational modes. The arrangement includes an end section terminated by an exhaust gas outlet. A diffuser section is provided in the exhaust pipe, the diffuser section having a first end in a distance from the outlet and a second end closer to the outlet is arranged in vicinity of the outlet, wherein at least one vane with an airfoil profile extends in an axial direction from the first end to the second end of the diffuser section.
1 . An exhaust pipe arrangement for discharging exhaust from a combustion engine through an exhaust pipe for a combustion engine with an exhaust gas aftertreatment system requiring high temperatures in one or more operational modes, comprising an end section terminated by an exhaust gas outlet, whereby a diffuser section provided in the exhaust pipe, the diffuser section having a first end in a distance from the outlet and a second end closer to the outlet is arranged in vicinity of the outlet, wherein at least one vane with an airfoil profile extends in an axial direction from the first end to the second end of the diffuser section wherein a free space defined by a tube is provided in a central region of the diffuser section provided for a passage of exhaust gas, wherein the tube defining the free space has a conical shape with a smaller diameter at the first end at a distance to the outlet and a larger diameter at the second end of the diffuser section close to the outlet.
2 . The exhaust pipe arrangement according to claim 1 , wherein in a front view on a cross section of the exhaust pipe at a location of the first end and/or second end of the diffuser section the at least one vane covers at least 25% of the cross sectional area of the diffuser section.
3 . The exhaust pipe arrangement according to claim 2 , wherein the free space has a diameter of not more than 60% of a diameter of the diffuser section.
4 . The exhaust pipe arrangement according to claim 1 , wherein the outlet has recesses at its free end where material of the exhaust pipe rim is removed.
5 . The exhaust pipe arrangement according to claim 1 , wherein the at least one vane, seen from the top, is arranged in a ring section with an outer diameter of at least 40% of a diameter of the diffuser section.
6 . The exhaust pipe arrangement according to claim 1 , wherein an orientation of an outer edge of the at least one vane deviates by at least 5° from the first end to the second end of the diffuser section, preferably by at least 10°.
7 . The exhaust pipe arrangement according to claim 1 , wherein an orientation of the outer edge of the at least one vane deviates by not more than 90° from the first end to the second end of the diffuser section.
8 . The exhaust pipe arrangement according to claim 1 , wherein a section of an outer edge of the at least one vane extends parallel to an axial direction at the first end.
9 . The exhaust pipe arrangement according to claim 1 , wherein a distance from the first end to the second end of the diffuser section is at least 40% of the diameter of the diffuser section.
10 . The exhaust pipe arrangement according to claim 9 , wherein a distance between the first end and the second end is larger than the diameter of the diffuser section.
11 . The exhaust pipe arrangement according to claim 1 , wherein at least three vanes are provided, wherein the at least three vanes are preferably arranged symmetrically around a central axis of the diffuser section.
12 . The exhaust pipe arrangement according to claim 1 , wherein an diffuser element is arranged in the diffuser section which diffuser element comprises the at least one vane and that the diffuser element is surrounded by a wall of the exhaust pipe.
13 . The exhaust pipe arrangement according to claim 1 , wherein the at least one vane is formed by a wall portion of the exhaust pipe.
14 . The exhaust pipe arrangement according to claim 1 , wherein the diffuser section abuts at least one section of the outlet.
15 . A vehicle comprising an exhaust pipe arrangement according to claim 1 .
16 . An exhaust pipe arrangement for discharging exhaust from a combustion engine through an exhaust pipe for a combustion engine with an exhaust gas aftertreatment system requiring high temperatures in one or more operational modes, comprising an end section terminated by an exhaust gas outlet, whereby a diffuser section provided in the exhaust pipe, the diffuser section having a first end in a distance from the outlet and a second end closer to the outlet is arranged in vicinity of the outlet, wherein at least one vane with an airfoil profile extends in an axial direction from the first end to the second end of the diffuser section wherein a free space defined by a tube is provided in a central region of the diffuser section provided for a passage of exhaust gas, wherein the tube defining the free space has a conical shape with a smaller diameter at the first end at a distance to the outlet and a larger diameter at the second end of the diffuser section close to the outlet.
17 . The exhaust pipe arrangement according to claim 16 , wherein in a front view on a cross section of the exhaust pipe at a location of the first end and/or second end of the diffuser section the at least one vane covers at least 25% of the cross sectional area of the diffuser section.
18 . The exhaust pipe arrangement according to claim 17 , wherein the free space has a diameter of not more than 60% of a diameter of the diffuser section.
19 . The exhaust pipe arrangement according to claim 16 , wherein the outlet has recesses at its free end where material of the exhaust pipe rim is removed.
20 . The exhaust pipe arrangement according to claim 16 , wherein the at least one vane, seen from the top, is arranged in a ring section with an outer diameter of at least 40% of a diameter of the diffuser section.
21 . The exhaust pipe arrangement according to claim 16 , wherein an orientation of an outer edge of the at least one vane deviates by at least 5° from the first end to the second end of the diffuser section.
22 . The exhaust pipe arrangement according to claim 16 , wherein an orientation of the outer edge of the at least one vane deviates by not more than 90° from the first end to the second end of the diffuser section.
23 . The exhaust pipe arrangement according to claim 16 , wherein a section of an outer edge of the at least one vane extends parallel to an axial direction at the first end.
24 . The exhaust pipe arrangement according to claim 16 , wherein a distance from the first end to the second end of the diffuser section is at least 40% of the diameter of the diffuser section.
25 . The exhaust pipe arrangement according to claim 24 , wherein a distance between the first end and the second end is larger than the diameter of the diffuser section.
26 . The exhaust pipe arrangement according to claim 16 , wherein at least three vanes are provided, wherein the at least three, vanes are preferably arranged symmetrically around a central axis of the diffuser section.
27 . The exhaust pipe arrangement according to claim 16 , wherein an diffuser element is arranged in the diffuser section which diffuser element comprises the at least one vane and that the diffuser element is surrounded by a wall of the exhaust pipe.
28 . The exhaust pipe arrangement according to claim 16 , wherein the at least one vane is formed by a wall portion of the exhaust pipe.
29 . The exhaust pipe arrangement according to claim 16 , wherein the diffuser section abuts at least one section of the outlet.
30 . A vehicle comprising an exhaust pipe arrangement according to claim 16 .