The Boeing Company

Andreas C Straub

Mark David Horn

Miklos Paul Petervary

Jerry W Brockmeyer

Eric J Krieg

William Donald Hood

Scott W Fowser

Jon C Wagner

A formed sheet heat exchanger is provided for exchanging heat between fluids is provided. The apparatus includes flow divider sheets that are positioned in a stacked configuration and extend in a longitudinal direction so that adjacent pairs of the sheets define flow passages therebetween for receiving first and second fluids. Each of the sheets is nonuniform in the longitudinal direction, having a manifold portion and a corrugated portion. The corrugated portions of each adjacent pair of sheets define a plurality of fluid channels therebetween that are connected to the portion of the flow passage defined between the manifold portions. The fluid channels are configured to receive the first or second fluids and transfer thermal energy therebetween through the flow divider sheets.

Formed sheet heat exchanger

A composite rotor is provided having a main body portion and a plurality of circumferentially spaced blades extending radially from the body portion. The rotor also includes a plurality of recessed radial splines in the body portion thereof. The splines are adapted for engaging a coupler, such as a gearwheel, and transmitting torque thereto. The amount of shear area provided by the recessed splines for transmitting torque from the rotor to the coupler is significantly increased over conventional designs because the shear area includes not only area in the inter-laminar plane, but also in the cross-laminar plane.

Composite rotor having recessed radial splines for high torque applications

A method for fabricating a fiber-reinforced ceramic matrix composite (FRCMC) part includes the steps of forming a blank from FRCMC material such that the blank has a dimension approximating a desired finished dimension for the part measuring the dimension of the blank in an unloaded condition, applying a load to the blank and then removing the load so as to cause permanent strain of the blank, measuring the dimension of the blank after the load has been applied and then removed, and comparing the measured dimension after loading to the previously measured dimension. In a preferred embodiment of the invention, if the dimension after loading differs from the dimension previously measured, the loading and measuring steps are repeated. After each loading cycle, the blank is measured and the measured dimension is compared to that previously measured after the prior loading cycle. The loading cycles are continued until the measured dimension differs from the previously measured dimension by less than a predetermined amount such that the blank has achieved dimensional stability with loading. After dimensional stability has been achieved, the final machining of the blank is performed to conform the dimension to the desired dimension.

Method of fabricating a fiber-reinforced ceramic matrix composite part

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Costa Mesa, CA, United States of America

Andreas C Straub