Numerical investigation on the biomimetic trailing edge of a high-subsonic turbine blade

Characterization of base bleed effects on subsonic trailing edge flows

“…al [18], Melzer and Pullan pointed out that the use of an elliptic trailing edge shape will both increase and equalize the base pressure, suppressing transonic vortex shedding for those conditions where straight or slightly rounded trailing edges would develop it. Luo et al [19] proposed a biomimetic spanwise trailing edge shape that was able to eliminate the shedding of von Kármán vortices, transforming them into small three-dimensional vortices that would quickly dissipate reducing the mixing losses. Different ways to control the flow over turbine airfoils have been considered in the last decades.…”

Numerical Study on the Biomimetic Trailing Edge of a Turbine Blade Under a Wide Range of Outlet Mach Numbers

“…Although it is proved that the bionic trailing edge can suppress the Karman vortex and reduce wake loss significantly at an exit Mach number of 0.79 in (Luo et al, 2019), as mentioned above, different exit Mach numbers have a great influence on the form of trailing edge vortex for conventional blades, so the important purpose of this paper is to study the influence of the BTE on the wake vortex and the ability to control wake loss under different Mach number conditions (0.38-1.21), especially after the Mach number is greater than 1, and the influence of BTE on the shockwave system and related loss. This study provides an important reference for the application of BTE in turbines under different working conditions.…”

“…Besides this, a more convex curvature can suppress the vortex shedding, and the trailing edge loss was lower. Inspired by the whisker of the harbor seal, the authors propose a bionic method to control the vortex shedding at the trailing edge of turbine blades (Luo et al, 2019).…”

“…They indicate that the structure of the harbor seal's whiskers can break the coherence structure of Karman vortices and reduce the vortex-induced vibrations. In the authors' previous research (Luo et al, 2019), the method of using the harbor seal structure to construct a bionic blade trailing edge is proposed. It is proved by DDES numerical simulation that the biomimetic trailing edge (BTE) suppresses the formation of a Karman vortex at the trailing edge when the isentropic exit Mach number is 0.79 and generates small spanwise vortices, which reduces the wake loss.…”

Influence of Cutting Angle of Blade Trailing Edge on Unsteady Flow in a Centrifugal Pump Under Off-Design Conditions

“…Li et al [21] studied the influences of sinusoidal tubercle trailing edge (STTE) impeller on the unstable pressure pulsation of centrifugal pumps and concluded that the STTE impeller can reduce the pressure pulsation amplitude. Luo et al [22] investigated the mechanism of wake loss reduction for biomimetic trailing edge and concluded that the wake area for the biomimetic trailing edge case is narrow, and the velocity in the wake recovers more quickly compared with the situations in the three other cases. Valipour et al [23] used a parameterised perturbation method to solve the corresponding nonlinear differential equation.…”