Nacelle intakes are designed to operate in a variety of flow conditions where different requirements make the solution a best compromise in terms of conflicting requirement that are established. In this paper we propose a numerical study of a civil aeroengine nacelle sensitivity to high-incidence conditions. The research is carried out by means of a design space exploration on intake geometries, in order to evaluate the geometric parameters that affect the distortion level, the total pressure losses, and the separation angle of attack. A parameterisation tool using B-Splines is employed to generate a series of intakes fitted on a baseline axisymmetric nacelle. Simulations are performed either by imposing standard boundary conditions at the fan face plane or by using a body force method to represent the fan. The validated body force model of a transonic fan is used to simulate the intake/fan coupling and its effects on the high-incidence aerodynamics. The study establishes a numerical procedure for the analysis of the design space, showing that the despite a different distortion level predicted at the aerodynamic interface plane using the two modelling approaches, they provide qualitatively consistent trends for optimal geometric parameters in this case study.
Sensitivity analysis of nacelle intake high-incidence aerodynamics including a body force fan model
Magrini, Andrea;Buosi, Denis;Benini, Ernesto
2021
Abstract
Nacelle intakes are designed to operate in a variety of flow conditions where different requirements make the solution a best compromise in terms of conflicting requirement that are established. In this paper we propose a numerical study of a civil aeroengine nacelle sensitivity to high-incidence conditions. The research is carried out by means of a design space exploration on intake geometries, in order to evaluate the geometric parameters that affect the distortion level, the total pressure losses, and the separation angle of attack. A parameterisation tool using B-Splines is employed to generate a series of intakes fitted on a baseline axisymmetric nacelle. Simulations are performed either by imposing standard boundary conditions at the fan face plane or by using a body force method to represent the fan. The validated body force model of a transonic fan is used to simulate the intake/fan coupling and its effects on the high-incidence aerodynamics. The study establishes a numerical procedure for the analysis of the design space, showing that the despite a different distortion level predicted at the aerodynamic interface plane using the two modelling approaches, they provide qualitatively consistent trends for optimal geometric parameters in this case study.File | Dimensione | Formato | |
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