Abstract
The article presents the way how the existing small vacuum aerodynamic tunnel IT (Institute of Thermomechanics) has been adapted for the measurement of the aeroelastic properties of the NACA 0015 airfoil and of the blade cascades composed of various types of blades with two degrees of freedom, pitch and common plunge. Attention was focused on the possibility of studying self-excited vibration at lower subsonic speeds. The modification of the test section is based on the knowledge gained during the study of self-excited airfoil oscillation.
Highlights
The problem of aeroelasticity of profile cascades is mentioned in the literature rarely [1, 2, 3, 4] and the information about the construction of an aerodynamic tunnel for the aeroelasticity of blade cascades with twoor more degrees of freedom has not been found in the studied literature
A vacuum aerodynamic tunnel with a small settling chamber was available for the planned experiments
In cases where the profiles in the cascade are significantly shifted in the direction of the axis of the test section, there is an idea to hang up the profiles only on one side and the balancing moment induced by a coil spring thread located on the side of the profile and supported by the side part of the sliding frame
Summary
The problem of aeroelasticity of profile cascades is mentioned in the literature rarely [1, 2, 3, 4] and the information about the construction of an aerodynamic tunnel for the aeroelasticity of blade cascades with twoor more degrees of freedom has not been found in the studied literature. In IT laboratories, aeroelasticity of profile cascades has not yet been experimentally tested. The suitability of supposed structural elements, e.g. maintaining for the elastic support of individual profiles and their assembly in cascades, has not yet been verified. A particular feature of the assignment was the possibility of the interferometry application and other optical methods to measure the flow field. For these types of experiments, IT has a unique interferometer of Mach-Zehnder type.
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