Investigations on static aeroelastic problems of transonic fans based on fluid–structure interaction method

Abstract

Fan blades of high bypass ratio gas turbine engines are subject to substantial aerodynamic and centrifugal loads, producing the well-known phenomenon of blade untwist. Accurate fan blade shape prediction is very crucial for high-performance aero-engine. In order to investigate the effects of static aeroelastic deflections on aerodynamic performances, a time domain two-way fluid-structure interaction method was applied to simulate the deflection of NASA Rotor 67 fan blades under different operating conditions. This paper pays attention to the deviation of fan profile and aerodynamic performance due to the varying aerodynamic loads, especially for off-design conditions. The results show that the static aeroelastic deflection has a 1.8% impact on the total pressure ratio under near stall condition, and a 1.7% impact on the choke mass flow rate, relative to the cold configuration. Thus, the blade design in industrial practice should adopt a two-way fluid-structure interaction method to consider the influence of static aeroelastic problems on aerodynamic performance.

Effects of Guide Vane Placement Angle on Hydraulic Characteristics of Flow Field and Optimal Design of Hydraulic Capsule Pipelines

“…In recent years, the numerical simulation of the bidirectional fluid-structure interaction has become an important tool of fluid machinery analysis, which considered the interaction between the fluid domain and the structural domain so that the computational results were closer to real physical phenomena. At present, the numerical simulation of the bidirectional fluid-structure interaction was mainly applied to the research findings in the rotating machineries such as the centrifugal pumps [34], the fans [35] and the turbines [36], but a very limited discussed on the piped carriage in HCPs has been presented. In this study, the bidirectional fluid-structure interaction between the structural domain of the piped carriage and the fluid domain within the pipelines was numerically investigated by using the commercial CFD software ANSYS-Fluent 12.0, and the effects of guide vane placement angle on the hydraulic characteristics of transporting the piped carriage within the horizontal pipelines were studied by identifying average speeds, velocity distributions, pressure distributions, vorticity magnitude distributions, pressure drop characteristics, mechanical efficiencies, as well as force statistics during the movement of the single piped carriage.…”

Mechanical response analysis of the wide-chord hollow fan blade considering the fluid–structure interaction

“…In addition, due to the thin thickness of the wide-chord hollow fan blade and coupled with the reduced mass, the stiffness will decrease accordingly, the response of external unsteady loads will become more and more significant, and the aerodynamic force effect on the blade cannot be ignored (Qu et al, 2015;Zhang and Fei, 2016). Therefore, the stress and structural strength characteristics of the wide-chord hollow fan blade under the aerodynamic force are of great significance for aero-engine fan blade design and maintenance (Wang et al, 2016).…”