Investigation and Improvement of Stall Characteristic of High-Lift Configuration without Slats

Abstract

In order to simplify the manufacturing process or because of the limitation of the propulsion system, business jet, small civil airplane, and turboprop aircraft are always designed without leading-edge slats, which poses a great challenge to the flight safety during takeoff and landing. Focusing on the low-speed stall and poststall conditions, we investigated the aerodynamic characteristics and flow mechanism of high-lift configuration without slats using an improved delayed detached eddy simulation (IDDES) model which is validated by numerical simulations of the Common Research Model (CRM). Based on the analysis of the calculated results, conclusion can be made that the stall behavior of the configurations is directly related to the onset and evaluation of flow separation on the suction side. And through further research, an efficient evaluation method that is capable of qualitatively predicting the stall performance of two-element high-lift configuration by stall angle distribution of wing sections is proposed. By using the evaluation method, together with design rules summarized from the present study, high-lift configuration with mild-stall characteristic can be obtained in the preliminary stage of design.

Numerical Investigation of Stall Characteristics of Common Research Model Configuration Based on Zonal Detached Eddy Simulation Method

“…The calculated values of the lift and drag coefficients are shown in Tables 2 and 3. And this result is very close to the results obtained by Zhao Yang et al using the IDDES method [26]. Temporal variations in the lift and drag coefficients obtained with…”

Sistema borroso para el soporte de la envolvente de velocidad de una aeronave

“…De la misma manera, el trabajo de (Da Silva et al, 2020) propone, para un avión durante la aproximación al aterrizaje, un control de flujo activo de los dispositivos de híper-sustentación (flaps/slats). (Yang et al, 2019) se centran en las condiciones de entrada en pérdida y posteriores a la entrada en pérdida a baja velocidad, investigando las características aerodinámicas y el mecanismo de flujo de la configuración de alta sustentación sin slats. Ninguno de ellos propone el control automático del despliegue de los flaps/slats, enfoque que presentamos en este trabajo.…”

Hybrid RANS/LES of a generic high-lift aircraft configuration near maximum lift

“…This feature makes the IDDES a “natural” candidate for three-element high-lift wings with deployed slat and flap, as resolved turbulence from the slat-cove separation may trigger WMLES behaviour inside the main-wing boundary layer and on the subsequent flap, both being critical for accurate flow predictions at high angles of attack. While this feature of IDDES has been successfully applied in 2D to simulate three-element airfoil flow (Probst et al , 2016), applications of HRLM to full aircraft at stall were so far focused on resolving the unsteady wing wake (Waldmann et al , 2016) or limited to 2-element wings using rather coarse grids (Yang et al , 2019).…”