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Some example muffling devices may include an inner flow conditioner shaped as a generally conical frustrum and a generally cylindrical an exhaust can around the inner flow conditioner. A ratio of a downstream end wall area of the inner flow conditioner to a downstream end annular area between the do

Some example muffling devices may include an inner flow conditioner shaped as a generally conical frustrum and a generally cylindrical an exhaust can around the inner flow conditioner. A ratio of a downstream end wall area of the inner flow conditioner to a downstream end annular area between the downstream end wall and the exhaust can may be about 0.12 to about 0.97. A ratio of the downstream end annular area to the downstream end wall area may be proportional, by a factor of about 0.8 to about 1.9, to a ratio of an effective area of the inner flow conditioner sidewall holes to an effective area of the inner flow conditioner downstream end wall holes. A ratio of a dissipation distance between the inner flow conditioner downstream end wall and the exhaust screen to the inner flow conditioner downstream end wall hole diameter may be greater than about 10.

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1. A muffling device, comprising: an inner flow conditioner shaped as a generally conical frustum comprising an upstream base and a downstream base, a diameter of the upstream base being larger than a diameter of the downstream base, the inner flow conditioner comprising an inlet approximate the ups

1. A muffling device, comprising: an inner flow conditioner shaped as a generally conical frustum comprising an upstream base and a downstream base, a diameter of the upstream base being larger than a diameter of the downstream base, the inner flow conditioner comprising an inlet approximate the upstream base,a generally circular inner flow conditioner downstream end wall having an inner flow conditioner downstream end wall area, the inner flow conditioner downstream end wall being generally orthogonal to a longitudinal axis of the conical frustum and comprising a plurality of generally longitudinally oriented inner flow conditioner downstream end wall holes, andan inner flow conditioner sidewall shaped generally as a truncated cone, the inner flow conditioner sidewall tapering inwardly from approximate the upstream base to approximate the inner flow conditioner downstream wall, the inner flow conditioner sidewall comprising a plurality of generally laterally oriented inner flow conditioner sidewall holes; andan exhaust can disposed substantially around the inner flow conditioner and shaped as a generally circular cylinder, the exhaust can comprising a generally annular upstream end wall disposed approximate the upstream base of the inner flow conditioner and substantially circumscribing the upstream base of the inner flow conditioner,a generally circular exhaust screen comprising a plurality of exhaust screen holes, anda generally circular exhaust can sidewall extending from approximate the upstream end wall to approximate the exhaust screen;wherein the inner flow conditioner and the exhaust can are configured to conduct a fluid inward through the inlet into the inner flow conditioner, through the inner flow conditioner downstream end wall discharge openings and the inner flow conditioner sidewall discharge openings into the exhaust can, and outward through the exhaust screen discharge openings;wherein the exhaust can and the inner flow conditioner downstream end wall at least partially define a downstream end annular area therebetween; andwherein a ratio of the inner flow conditioner downstream end wall area to the downstream end annular area is about 0.12 to about 0.97. 2. The muffling device of claim 1, wherein the ratio of the inner flow conditioner downstream end wall area to the downstream end annular area is about 0.16 to about 0.28. 3. The muffling device of claim 1, wherein the ratio of the inner flow conditioner downstream end wall area to the downstream end annular area is about 0.17 to about 0.20. 4. The muffling device of claim 1, wherein a ratio of the downstream end annular area to the downstream end wall area is proportional, by a factor of about 0.8 to about 1.9, to a ratio of an effective area of the inner flow conditioner sidewall holes to an effective area of the inner flow conditioner downstream end wall holes. 5. The muffling device of claim 1, wherein a ratio of the downstream end annular area to the downstream end wall area is proportional, by a factor of about 0.97 to about 1.26, to a ratio of an effective area of the inner flow conditioner sidewall holes to an effective area of the inner flow conditioner downstream end wall holes. 6. The muffling device of claim 1, wherein the inner flow conditioner downstream end wall holes have an inner flow conditioner downstream end wall hole diameter;wherein the inner flow conditioner downstream end wall is spaced from the exhaust screen by a dissipation distance; andwherein a ratio of the dissipation distance to the inner flow conditioner downstream end wall hole diameter is greater than about 10. 7. The muffling device of claim 1, wherein the inner flow conditioner downstream end wall holes have an inner flow conditioner downstream end wall hole diameter;wherein the inner flow conditioner downstream end wall is spaced from the exhaust screen by a dissipation distance; andwherein a ratio of the dissipation distance to the inner flow conditioner downstream end wall hole diameter is greater than about 20. 8. A muffling device, comprising: an inner flow conditioner shaped as a generally conical frustum comprising an upstream base and a downstream base, a diameter of the upstream base being larger than a diameter of the downstream base, the inner flow conditioner comprising an inlet approximate the upstream base,a generally circular inner flow conditioner downstream end wall having an inner flow conditioner downstream end wall area, the inner flow conditioner downstream end wall being generally orthogonal to a longitudinal axis of the conical frustum and comprising a plurality of generally longitudinally oriented inner flow conditioner downstream end wall holes, andan inner flow conditioner sidewall shaped generally as a truncated cone, the inner flow conditioner sidewall tapering inwardly from approximate the upstream base to approximate the inner flow conditioner downstream wall, the inner flow conditioner sidewall comprising a plurality of generally laterally oriented inner flow conditioner sidewall holes; andan exhaust can disposed substantially around the inner flow conditioner and shaped as a generally circular cylinder, the exhaust can comprising a generally annular upstream end wall disposed approximate the upstream base of the inner flow conditioner and substantially circumscribing the upstream base of the inner flow conditioner,a generally circular exhaust screen comprising a plurality of exhaust screen holes, anda generally circular exhaust can sidewall extending from approximate the upstream end wall to approximate the exhaust screen;wherein the inner flow conditioner and the exhaust can are configured to conduct a fluid inward through the inlet into the inner flow conditioner, through the inner flow conditioner downstream end wall discharge openings and the inner flow conditioner sidewall discharge openings into the exhaust can, and outward through the exhaust screen discharge openings;wherein the exhaust can and the inner flow conditioner downstream end wall at least partially define a downstream end annular area therebetween; andwherein a ratio of the downstream end annular area to the downstream end wall area is proportional, by a factor of about 0.8 to about 1.9, to a ratio of an effective area of the inner flow conditioner sidewall holes to an effective area of the inner flow conditioner downstream end wall holes. 9. The muffling device of claim 8, wherein the ratio of the downstream end annular area to the downstream end wall area is proportional, by a factor of about 0.88 to about 1.58, to the ratio of the effective area of the inner flow conditioner sidewall holes to the effective area of the inner flow conditioner downstream end wall holes. 10. The muffling device of claim 8, wherein the ratio of the downstream end annular area to the downstream end wall area is proportional, by a factor of about 0.97 to about 1.26, to the ratio of the effective area of the inner flow conditioner sidewall holes to the effective area of the inner flow conditioner downstream end wall holes. 11. The muffling device of claim 8, wherein a ratio of the inner flow conditioner downstream end wall area to the downstream end annular area is about 0.17 to about 0.20. 12. The muffling device of claim 8, wherein the inner flow conditioner downstream end wall holes have an inner flow conditioner downstream end wall hole diameter;wherein the inner flow conditioner downstream end wall is spaced from the exhaust screen by a dissipation distance; andwherein a ratio of the dissipation distance to the inner flow conditioner downstream end wall hole diameter is greater than about 10. 13. The muffling device of claim 8, wherein the inner flow conditioner downstream end wall holes have an inner flow conditioner downstream end wall hole diameter;wherein the inner flow conditioner downstream end wall is spaced from the exhaust screen by a dissipation distance; andwherein a ratio of the dissipation distance to the inner flow conditioner downstream end wall hole diameter is greater than about 20. 14. A muffling device, comprising: an inner flow conditioner shaped as a generally conical frustum comprising an upstream base and a downstream base, a diameter of the upstream base being larger than a diameter of the downstream base, the inner flow conditioner comprising an inlet approximate the upstream base,a generally circular inner flow conditioner downstream end wall having an inner flow conditioner downstream end wall area, the inner flow conditioner downstream end wall being generally orthogonal to a longitudinal axis of the conical frustum and comprising a plurality of generally longitudinally oriented inner flow conditioner downstream end wall holes, and an inner flow conditioner sidewall shaped generally as a truncated cone, the inner flow conditioner sidewall tapering inwardly from approximate the upstream base to approximate the inner flow conditioner downstream wall, the inner flow conditioner sidewall comprising a plurality of generally laterally oriented inner flow conditioner sidewall holes; andan exhaust can disposed substantially around the inner flow conditioner and shaped as a generally circular cylinder, the exhaust can comprising a generally annular upstream end wall disposed approximate the upstream base of the inner flow conditioner and substantially circumscribing the upstream base of the inner flow conditioner,a generally circular exhaust screen comprising a plurality of exhaust screen holes, anda generally circular exhaust can sidewall extending from approximate the upstream end wall to approximate the exhaust screen;wherein the inner flow conditioner and the exhaust can are configured to conduct a fluid inward through the inlet into the inner flow conditioner, through the inner flow conditioner downstream end wall discharge openings and the inner flow conditioner sidewall discharge openings into the exhaust can, and outward through the exhaust screen discharge openings;wherein the exhaust can and the inner flow conditioner downstream end wall at least partially define a downstream end annular area therebetween;wherein the inner flow conditioner downstream end wall holes have an inner flow conditioner downstream end wall hole diameter;wherein the inner flow conditioner downstream end wall is spaced from the exhaust screen by a dissipation distance; andwherein a ratio of the dissipation distance to the inner flow conditioner downstream end wall hole diameter is greater than about 10. 15. The muffling device of claim 14, wherein a ratio of the dissipation distance to the inner flow conditioner downstream end wall hole diameter is greater than about 15. 16. The muffling device of claim 14, wherein a ratio of the dissipation distance to the inner flow conditioner downstream end wall hole diameter is greater than about 20. 17. The muffling device of claim 14, wherein a ratio of the inner flow conditioner downstream end wall area to the downstream end annular area is about 0.16 to about 0.28. 18. The muffling device of claim 14, wherein a ratio of the inner flow conditioner downstream end wall area to the downstream end annular area is about 0.17 to about 0.20. 19. The muffling device of claim 14, wherein a ratio of the downstream end annular area to the downstream end wall area is proportional, by a factor of about 0.88 to about 1.58, to a ratio of an effective area of the inner flow conditioner sidewall holes to an effective area of the inner flow conditioner downstream end wall holes. 20. The muffling device of claim 14, wherein a ratio of the downstream end annular area to the downstream end wall area is proportional, by a factor of about 0.97 to about 1.26, to a ratio of an effective area of the inner flow conditioner sidewall holes to an effective area of the inner flow conditioner downstream end wall holes.