Introduction of exhaust gas recirculation at a compressor blade trailing edge

摘要

Methods and systems are provided for injecting exhaust gases from an exhaust gas recirculation system proximate to a trailing edge of a compressor wheel of a compressor. In one example, a compressor of a turbocharger may include an exhaust gas recirculation inlet volute within a casting of the compressor. The exhaust gas recirculation inlet volute may include an injection port positioned downstream of the trailing edge of the compressor wheel for injecting exhaust gases into intake air flow.

主权项

1. A compressor of a turbocharger, comprising:
a compressor wheel rotatable about a central rotational axis of the compressor; a volute positioned within a casting of the compressor and including a diffuser; and an exhaust gas recirculation inlet volute positioned within a backplate of the compressor, the exhaust gas recirculation inlet volute having an injection port coupled to the diffuser downstream of a trailing edge of the compressor wheel, where both the volute and the exhaust gas recirculation inlet volute are circular passages with a circular cross-section area and a passage diameter that change along a length of each volute as each volute wraps around the central rotational axis of the compressor, where the exhaust gas recirculation inlet volute is positioned on an opposite side of the diffuser from the volute, where the injection port is a curved slot between the exhaust gas recirculation inlet volute and the diffuser, and downstream of the trailing edge, where the curved slot curves from the exhaust gas recirculation inlet volute to the diffuser in an airflow direction, the curved slot extending around a circumference of the compressor wheel, and where the curved slot curves outward from a main passageway of the exhaust gas recirculation inlet volute, in a direction relative to the central rotational axis.