Ram air fan outer housing

摘要

A ram air fan outer housing for directing air from a ram air fan rotor and air from a ram air bypass into a ram air fan outlet. The outer housing includes an outer cylinder and a plenum connected at a joint region. The outer cylinder is made of a laminate stacking sequence of at least four adjacent layers of plain-weave carbon-fiber fabric in an A-B-B-A sequence. The plenum is made of a laminate stacking sequence of at least eight adjacent plenum layers of plain-weave carbon-fiber fabric in an A-B-B-A-A-B-B-A sequence. The plenum is joined to the outer cylinder at a joint region, the joint region includes a transition section transitioning the laminate stacking sequence from the eight adjacent layers of the plenum walls to the four adjacent layers of the outer cylinder walls.

主权项

1. A ram air fan outer housing for directing air from a ram air fan rotor and air from a ram air bypass into a ram air fan outlet, the outer housing comprising:
an outer cylinder having a ram air fan rotor end and a ram air fan outlet end, the ram air fan rotor end and the ram air fan outlet end at opposite ends of an axis of the outer cylinder; the outer cylinder including walls having a laminate stacking sequence of at least four adjacent layers of plain-weave carbon-fiber fabric, each layer of the four adjacent outer cylinder layers having a weave orientation such that a first outer cylinder layer and a fourth outer cylinder layer are oriented forty-five degrees from each of a second outer cylinder layer and a third outer cylinder layer, the second outer cylinder layer and the third outer cylinder layer sandwiched between the first outer cylinder layer and the fourth outer cylinder layer; and a plenum for directing air from the ram air bypass into the outer cylinder, the plenum including walls having a laminate stacking sequence of at least eight adjacent plenum layers of plain-weave carbon-fiber fabric, each layer of the eight adjacent layers having a weave orientation such that a first plenum layer, a fourth plenum layer, a fifth plenum layer, and an eighth plenum layer are oriented forty-five degrees from each of a second plenum layer, a third plenum layer, a sixth plenum layer, and a seventh plenum layer; the second plenum layer and the third plenum layer are sandwiched between the first plenum layer and the fourth plenum layer; the sixth plenum layer and the seventh plenum layer are sandwiched between the fifth plenum layer and the eighth plenum layer; and the fourth plenum layer and the fifth plenum layer are sandwiched between the third plenum layer and the sixth plenum layer; wherein the plenum is joined to the outer cylinder at a joint region, the joint region including a transition section transitioning the laminate stacking sequence from the eight adjacent layers of the plenum walls to the four adjacent layers of the outer cylinder walls.