Patent ID: 9638199
Date: 2017-05-02
CPC Classifications: F04D,Y10T

Claim:
1. A ram air fan inlet shroud for a ram air fan assembly for an aircraft, the ram air fan inlet shroud comprising: a shroud portion extending outwardly from a conical portion, the conical portion providing a transition between a central portion and an inner ram air fan hub interface portion, the conical portion comprising a plurality of inner cooling slots having a substantially elongated kidney shape with a slot arc length and spaced apart by a slot spacing angle, wherein a ratio of the slot spacing angle to the slot arc length is between 1.23 and 1.4; a recessed portion located between the inner ram air fan hub interface portion and an outer ram air fan hub interface portion, the recessed portion comprising a plurality of outer cooling holes that are each substantially circular, wherein a ratio of a total outer cooling area of the outer cooling holes to a total inner cooling area of the inner cooling slots is between 1.242 and 1.419; and a ram air fan inlet shroud centerline and an origin point that is flush with the outer ram air fan hub interface portion along the ram air fan inlet shroud centerline, and a slot centerline of each of the inner cooling slots is offset from the origin point, wherein a ratio of an angle of each of the outer cooling holes to the origin point and an angle of each of the inner cooling slots to the origin point is between 1.87 and 2.14.