What type of combustion liner configurations does not include the annular type?

The can-annular type of combustion liner configuration is an important design in gas turbine engines, typically consisting of multiple can-type liners arranged in a circular pattern. However, this type does include annular characteristics because it forms a type of annular chamber with several independent can combustors arranged in a way that they collectively create an annular-type effect for the overall combustion chamber.

On the other hand, hybrid configurations, chevron configurations, and direct flow configurations do not fit the definition of annular types. Hybrid configurations typically mix features of different combustion chamber designs, including both can and annular characteristics but do not adhere strictly to traditional annular forms. Chevron combustion liners are often recognized for their distinctive shapes that aid in efficient mixing of fuel and air, but they do not form a complete annular chamber. Direct flow configurations might refer to designs that enhance the straightforward flow path of combustion gases without creating a traditional annular combustion chamber.

Thus, focusing on the hybrid, chevron, and direct flow configurations reveals that these designs do not include the annular design principle, making the can-annular type the standout option in the context of the original question.