Inside-out rotary ramjet turbogenerator

Werner J.A. Dahm, Andrew P. Lapsa, Peter E. Hamlington

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations


A method for implementing the Brayton cycle to provide a practical rotary ramjet engine/generator based on a fundamentally "inside-out" approach is presented. Such a rotary ramjet turbogenerator eliminates the need for the conventional bladed compressor and turbine used In traditional gas turbine engines. It replaces these with a single inside-out supersonic circumferential rotor having integrated varying-area shaped ceramic ramjet channels in its radially inward surface, in which compression, combustion and expansion occur. The inside-out design places all rotating parts under compressive centrifugal loading, allowing ceramic fabrication of the high-temperature ramjet channel sections to enable operation at increased combustor exit temperatures with substantially reduced cooling requirements. The increased combustor temperature leads to increased maximum power and Increased thermal efficiency when operating at maximum power. Furthermore, in this inside-out approach the centripetal acceleration acting on the flow in the ramjet channels causes high-density reactants to be forced into the radially inward-facing combustor, and low-density combustion products to be forced out of the combustor. This greatly assists in mixing and flameliolding without the need for vortex generators or similar devices. The advantages of the Inside-out approach over previous rotary ramjet systems become Increasingly Important as the rotor radius Is decreased, since the centripetal acceleration then becomes increasingly large.

Original languageEnglish (US)
Title of host publicationCollection of Technical Papers - 4th International Energy Conversion Engineering Conference
Number of pages15
StatePublished - Dec 1 2006
Externally publishedYes
Event4th International Energy Conversion Engineering Conference - San Diego, CA, United States
Duration: Jun 26 2006Jun 29 2006

Publication series

NameCollection of Technical Papers - 4th International Energy Conversion Engineering Conference


Other4th International Energy Conversion Engineering Conference
Country/TerritoryUnited States
CitySan Diego, CA

ASJC Scopus subject areas

  • Engineering(all)


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