Patent ID: 8763751
Filing Date: 2014-07-01
Classification: B64D,F02C,F02K,F05D,Y02T

Abstract:
1. A silencer for an auxiliary power unit of an aircraft, comprising: an inlet; an outlet; a housing; and a flow channel arranged in the housing, wherein an intermediate space is formed between the housing and the flow channel, the intermediate space being divided into outer cells that are arranged around the flow channel by one or more partitions, wherein a wall material of the flow channel is porous, wherein the partitions are arranged relative to one another in such a way that at least first and second groups of outer cells are formed in the intermediate space between the housing and the flow channel, wherein the outer cells of the first group have a length comprised of a first interval and the outer cells of the second group have a length comprised of a second interval, wherein the first and the second intervals are adjacent to one another and respectively have a width essentially corresponding to 0.1-times the hydraulic diameter of the flow channel, and wherein the outer cells have a volume corresponding to 1.0-1.2-times the volume of inner cells enclosed by the respective outer cells and formed in the flow channel.