Patent ID: 11927151
Assignee: COMBUSTION RESEARCH AND FLOW TECHNOLOGY, INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  B | IPC B  F

Claim 0:
1. An inlet duct for use with a turbine engine comprising:
(a) a duct structure having an interior surface;
(b) at least two spikes disposed along said interior surface so said spikes interact in use with an airflow, each said spike includes a longitudinal ridge and a lateral ridge which intersect at an apex, said longitudinal ridge intersects said interior surface at an upstream end and a downstream end to define a height between said longitudinal ridge and said interior surface wherein said height increases along said longitudinal ridge in direction toward said apex, said lateral ridge intersects said interior surface at a pair of lateral ends to define a width between said lateral ends wherein said width decreases along said longitudinal ridge with distance from said apex, said duct structure having an opening at an upstream side to permit said airflow to enter said duct structure, said upstream end of said longitudinal ridge located at or downstream from said opening; and
(c) an inlet throat formed at said apexes, a normal shock formed in use downstream from said inlet throat, said normal shock decelerates said airflow to less than supersonic and at a pressure permitting supersonic flight.