A combustor assembly for a heat engine is generally provided. The combustor assembly defines a fuel nozzle centerline and a radial direction extended from the nozzle centerline. The combustor assembly includes a fuel nozzle disposed at least partially concentric to the nozzle centerline. The fuel nozzle defines a fuel injection opening. A deflector assembly is defined around the nozzle centerline extended therethrough. The deflector assembly includes a deflector wall extended at least partially along the radial direction. The deflector assembly includes a conical portion defined around the nozzle centerline. The conical portion defines a fuel nozzle opening. A plurality of openings is defined through the conical portion radially adjacent to the fuel injection opening at the fuel nozzle.