Turbine engine with shockwave attenuation
Aspects of the disclosure generally relate to a turbine engine and method of operating a turbine engine having an engine core including a compressor, combustor, and turbine in axial flow arrangement, whereby a working airflow passes through the engine core from the compressor to the turbine to define a flow direction through the engine core. The method includes generating a shockwave in the working airflow that propagates in the flow direction, and at least partially attenuating the shockwave.
1. A method of operating a turbine engine having an engine core comprising a compressor, combustor, and turbine in axial flow arrangement, whereby a working airflow passes through the engine core from the compressor to the turbine to define a flow direction through the engine core, the method comprising:
generating a shockwave in the working airflow that propagates onto an outer surface of at least one component within the turbine engine having at least one attenuation structure; and
flowing cooling air from an interior of the at least one component through the at least one attenuation structure into the working airflow in a direction at least partially opposite the flow direction to at least partially attenuate the shockwave.
2. The method of claim 1 wherein the at least one component comprises at least one of an airfoil, an inner band, or an outer band.
3. The method of claim 1 , further comprising directing a reflected portion of the shockwave over a second attenuation structure on a second component to attenuate the reflected portion.
4. The method of claim 1 wherein the at least one component comprises two circumferentially-spaced airfoils, and wherein the directing further comprises directing the shockwave between the two circumferentially-spaced airfoils.
5. The method of claim 1 wherein the shockwave comprises a pressure wave within a subsonic flow.
6. A turbine engine, comprising:
an engine core comprising a compressor, combustor, and turbine in axial flow arrangement;
a flow path extending through the engine core from the compressor to the turbine to define a flow direction for a working airflow through the engine core;
a rotatable set of airfoils in one of the compressor or turbine, whereby rotation of the set of airfoils forms the working airflow having a shockwave;
at least one component in the flow path comprising an outer surface bounding an interior, with the shockwave flowing onto the outer surface; and
at least one attenuation structure on the outer surface comprising a set of cooling holes having corresponding outlets oriented at least partially in a direction opposite the flow direction to at least partially attenuate the shockwave flowing onto the outer surface.
7. The turbine engine of claim 6 , further comprising a second component comprising a second attenuation structure configured to attenuate a reflected shockwave flowing thereon.
8. The turbine engine of claim 6 wherein the at least one component comprises an airfoil with the outer surface defining a pressure side and a suction side and extending between a leading edge and a trailing edge.