Intake arrangement for combustion chamber
View Patent ↗In an intake arrangement for a combustion chamber in which a first intake duct produces a substantially rotational flow in the chamber, the flow from a second intake duct is divided into two components. The first component is an axial flow into the chamber and the second component is a rotational flow having the same sense of rotation as the first duct. The first and second components arise from the shaping of a junction region between branches of the second intake duct adjacent the chamber.
1. An intake arrangement for a combustion chamber, comprising:
a first intake duct configured to produce a first substantially rotational flow in the combustion chamber; and
a second intake duct configured to produce a flow having a first component and a second component, the second intake duct comprising:
a first branch having a first end that is arranged to open into the combustion chamber;
a second end connected to a second branch, the second branch extending transversely of the first branch, and
a junction of the first branch and the second branch that has an outer part-cylindrical wall with a first longitudinal axis substantially parallel to a second longitudinal axis of the combustion chamber and an inner part-cylindrical wall substantially coaxial with the outer part-cylindrical wall,
wherein the first component is directed axially into the combustion chamber, and
wherein the second component represents a second substantially rotational flow in the combustion chamber and the first substantially rotational flow and the second component have a same sense of rotation.
2. The intake arrangement according to claim 1 , wherein the inner part-cylindrical wall extends only within a part of a height of the outer part-cylindrical wall remote from the combustion chamber.
3. The intake arrangement according to claim 1 , wherein the inner part-cylindrical wall and the outer part-cylindrical wall has cross-sections forming parts of circles.
4. The intake arrangement according to claim 2 , wherein the inner part-cylindrical wall merges into a substantially straight section that extends across the second branch.
5. The intake arrangement according to claim 4 , wherein the height of the substantially straight section increases away from a part-circular section of the inner part-cylindrical wall.
6. The intake arrangement according to claim 2 , wherein parts of the inner part-cylindrical wall and the outer part-cylindrical wall that are remote from the second branch and remote from the combustion chamber terminate and interconnect by an end wall extending in a substantially vertical direction, the inner part-cylindrical wall, the outer part-cylindrical wall, and the end wall forming an annular passageway.
7. The intake arrangement according to claim 6 , wherein a substantially cylindrical sub-chamber is formed adjacent to the combustion chamber, said substantially cylindrical sub-chamber partly delimited by the part of the height of the outer part-cylindrical wall adjacent to the combustion chamber.
8. The intake arrangement according to claim 7 , wherein between the end wall and the second branch, the outer part-cylindrical wall continues circumferentially in a radially recessed portion that also partly delimits said substantially cylindrical sub-chamber.
9. The intake arrangement according to claim 7 , wherein the top of the substantially cylindrical sub-chamber is defined by a plateau portion, an edge of the plateau portion defined by the bottom of the inner part-cylindrical wall and the top of a recessed portion of the outer part-cylindrical wall.
10. An intake duct arrangement for a combustion chamber, comprising:
a first branch having a first end arranged to open into the combustion chamber;
a second end connected to a second branch, the second branch extending transversely of the first branch; and
a junction that connects the first branch and the second branch having an outer part-cylindrical wall with a longitudinal axis substantially parallel to the longitudinal axis of the first branch and an inner part-cylindrical wall substantially coaxial with the outer part-cylindrical wall,
wherein the junction of the first branch and the second branch produces a flow having a vertical component and a rotational component.
11. The intake duct arrangement according to claim 10 , further comprising:
a third branch having a third end that is arranged to open into the combustion chamber;
a fourth end connected to a fourth branch, the fourth branch extending transversely of the first branch, and
a second junction of the second branch and the third branch that has an second outer part-cylindrical wall with a first longitudinal axis substantially parallel to a second longitudinal axis of the combustion chamber and the inner part-cylindrical wall substantially coaxial with the outer part-cylindrical wall.
12. The intake duct arrangement according to claim 11 , wherein the inner part-cylindrical wall extends only within a part of a height of the outer part-cylindrical wall remote from the combustion chamber.
13. The intake duct arrangement according to claim 11 , wherein the inner part-cylindrical wall and the outer part-cylindrical wall has cross-sections forming parts of circles.
14. The intake duct arrangement according to claim 12 , wherein the inner part-cylindrical wall merges into a substantially straight section that extends across the second branch.
15. The intake duct arrangement according to claim 14 , wherein the height of the substantially straight section increases away from a part-circular section of the inner part-cylindrical wall.
16. The intake duct arrangement according to claim 12 , wherein parts of the inner part-cylindrical wall and the outer part-cylindrical wall remote from the second branch and remote from the combustion chamber terminate and are interconnected by an end wall extending in a substantially vertical direction, the inner part-cylindrical wall, the outer part-cylindrical wall, and the end wall forming an annular passageway.
17. The intake duct arrangement according to claim 16 , wherein a substantially cylindrical sub-chamber is formed adjacent to the combustion chamber, said substantially cylindrical sub-chamber partly delimited by the part of the height of the outer part-cylindrical wall adjacent to the combustion chamber.
18. The intake duct arrangement according to claim 17 , wherein between the end wall and the second branch, the outer part-cylindrical wall continues circumferentially in a radially recessed portion that also partly delimits said substantially cylindrical sub-chamber.
19. The intake duct arrangement according to claim 17 , wherein the top of the substantially cylindrical sub-chamber is defined by a plateau portion, an edge of the plateau portion defined by the bottom of the inner part-cylindrical wall and the top of a recessed portion of the outer part-cylindrical wall.