Numerical research on the aerodynamic performance of inlet volute duct for a heavy-duty gas turbine

Abstract

Heavy-duty gas turbines represent a highly efficient method for converting heat into power within power generation systems. As the technology behind these turbines advances, their operational efficiency and stability have become paramount. The intake volute, a crucial component of the turbine’s intake system, significantly affects the airflow dynamics within the inlet channel of the pressurized turbine. This study employs numerical simulations to analyze the airflow field within the L inlet volute duct of a heavy-duty gas turbine. Initial findings indicate a lack of uniformity in the airflow field as it transitions through the volute’s turning section into the contraction area. Modifications to the arc structure at the airflow corners have demonstrated potential for enhancing flow uniformity in the constriction section while reducing total pressure distortion at the volute duct’s outlet. Further analysis of linear structural parameters of the contraction section, including the taper angle (α) and the tilt angle (β) at the rear of the inlet chamber, reveals that a lower Bezier curve parameter I significantly diminishes exit airflow distortion. Conversely, Bezier curve parameter II appears to exert minimal influence on airflow distortion. Optimal taper and tilt angles, ranging from 25° to 30° and 9° respectively, minimize mean velocity inhomogeneity and total pressure distortion at the outlet. Compared to the original structure, these adjustments reduce mean velocity inhomogeneity by 55.19% and total pressure distortion by 53.93% at the duct’s outlet, thus achieving a more uniform flow field.