Review of Research on Asymmetric Twin-Scroll Turbocharging for Heavy-Duty Diesel Engines

Asymmetric twin-scroll turbocharging technology, as one of the effective technologies for balancing fuel economy and nitrogen oxide emissions, has been widely studied in the past decade. In response to the ever-increasing demands for improved fuel efficiency and reduced exhaust emissions, extensive research efforts have been dedicated to investigating various aspects of this technology. Researchers have conducted both experimental and simulation studies to delve into the intricate flow mechanism of asymmetric twin-scroll turbines. Furthermore, considerable attention has been given to exploring the optimal matching between asymmetric twin-scroll turbines and engines, as well as devising innovative flow control methods for these turbines. Additionally, researchers have sought to comprehend the impact of exhaust pulse flow on the performance of asymmetric twin-scroll turbines. Drawing on a comprehensive review of prior research endeavors, this study presents a meticulous summary of the advancements made in asymmetric twin-scroll turbocharging technology, with a specific focus on its application in heavy-duty diesel engines. By analyzing and synthesizing the findings from these previous investigations, this work also identifies the existing challenges and outlines the future research priorities in this field. The continued exploration and optimization of asymmetric twin-scroll turbocharging technology holds immense promise in enhancing fuel economy and mitigating nitrogen oxide emissions. Consequently, this research contributes to the ongoing efforts aimed at achieving sustainable and environmentally friendly transportation solutions.