Design of Pre-diffuser Cone for Dump Diffusers for Aero Gas Turbine Engines

Design Optimization of Dump Diffusers with NACA 66-021 Shaped Flame Tube

“…2e) in the dump diffuser for getting better performance based on the physical insight gained throw the in silico simulations while characterizing airfoil flow features in a wall-bounded flow system at subsonic inflow conditions. Authors reported that NACA 66021 has high profile drag and form drag on the flow [2], which could increase the static pressure recovery and compliment with the coupled effect on multiple divergent walls on dump diffuser. Authors further reported that the thickness to chord (t/c) ratio of an airfoil is an important parameter for the flame tube to achieve the maximum possible static pressure recovery on the dump diffuser [2].…”

“…Authors reported that NACA 66021 has high profile drag and form drag on the flow [2], which could increase the static pressure recovery and compliment with the coupled effect on multiple divergent walls on dump diffuser. Authors further reported that the thickness to chord (t/c) ratio of an airfoil is an important parameter for the flame tube to achieve the maximum possible static pressure recovery on the dump diffuser [2]. Experienced gained from the comprehensive in silico simulation prompted the authors to examine the flow features of various dump diffusers with various symmetrical airfoils having different (t/c) ratios to optimize the t/c ratio of a flame tube for meeting the design objectives of modern aircraft engines lucratively.…”

“…Towards meeting this objective, we have carried out comprehensive in silico studies. Numerical simulations are carried with low inlet velocity in the range of 30-90 m/s, which ensures effective combustion [1]. During the parametric studies, we found that the thickness-to-chord ratio (t/c) of the flame tube is having bearing on the static pressure recovery.…”

“…Aravind and Sabarinathan et.al. [2], replaced the NACA 0012 with the NACA 66-021 shaped flame tube (see Fig. 2e) in the dump diffuser for getting better performance based on the physical insight gained throw the in silico simulations while characterizing airfoil flow features in a wall-bounded flow system at subsonic inflow conditions.…”

“…In our connected work, Aravind et al [1,2] reported that the dump diffuser with geometrically optimized prediffuser upstream port and its divergent cone along with the aerodynamically-shaped adjustable flame tube for attaining a variable dump gap effect is a profitable and viable option for improving the performance characteristics of aero gas turbine engines under a wide range of operating conditions. Towards meeting further design objectives, in this connected project, using a two-dimensional (2D) standard k-ε turbulence model, parametric analytical studies have been carried out to examine the flow features through a dump diffuser facilitated with NACA airfoilshaped flame tubes.…”