Abstract
AbstractThis article presents a numerical method and its application for an assessment of the flow field inside a wind tunnel. A structured computational fluid dynamics (CFDs) solver with overset mesh technique is developed in order to simulate geometrically complex configurations. Applying the developed solver, a whole transonic cascade wind tunnel is modeled and simulated by a two-dimensional manner. The upstream and downstream periodicity of the cascade and the effect of the tunnel wall on the unsteady flow field are focused on. From the steady flow simulations, the existence of an optimum throttle position for the best periodicity for each tailboard angle is shown, which provides appropriate aerodynamic characteristics of ideal cascades in the wind tunnel environment. Unsteady simulations with blade oscillation is also conducted, and the difference in the influence coefficients between ideal and wind tunnel configurations becomes large when the pressure amplitude increases on the lower blades.
Highlights
A detailed knowledge of the characteristics of motion-excited aerodynamic force is essential for understanding and predicting an aeromechanical behaviour in turbomachinery
The aim of this study is to develop a numerical method for an assessment of the flow field inside a cascade wind tunnel for establishing a basic procedure for controlling its flow field
The present study focuses on the steady and unsteady flow field in the transonic wind tunnel
Summary
A detailed knowledge of the characteristics of motion-excited aerodynamic force is essential for understanding and predicting an aeromechanical behaviour in turbomachinery. A typical way for obtaining unsteady aerodynamic force is to measure the responses of flow field and aerodynamic force acting on the airfoils under prescribed blade motion. Such data are used for validations of numerical model for predicting and optimizing blade vibration characteristics during the design stage of turbomachinery (Ren et al, 2016). The operating conditions of the wind tunnels are carefully controlled to realize flow conditions similar to ideal infinite cascade (i.e., pitchwise periodicity) before detailed aerodynamic measurement (Vogt, 2005; Vogt and Fransson, 2006). Establishing a guideline for controlling the wind tunnel is beneficial for gathering data over a wide range of Tateishi et al | CFD assessment of a transonic cascade flutter wind tunnel https://journal.gpps.global/a/QL9XVI/
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