PIV-based pressure measurement

The topic of this article is a review of the approach to extract pressure fields from flow velocity field data, typically obtained with particle image velocimetry (PIV), by combining the experimental data with the governing equations. Although the basic working principles on which this procedure relies have been known for quite some time, the recent expansion of PIV capabilities has greatly increased its practical potential, up to the extent that nowadays a time-resolved volumetric pressure determination has become feasible. This has led to a noveldiagnostic methodology for determining the instantaneous flow field pressure in a non-intrusive way, which is rapidly finding acceptance in an increasing variety of application areas. The current review describes the operating principles, illustrating how the flow-governing equations, in particular the equation of momentum, are employed to compute the pressure from the material acceleration of the flow. Accuracy aspects are discussed in relation to the most dominating experimental influences, notably the accuracy of the velocity source data, the temporal and spatial resolution and the method invoked to estimate the material derivative. In view of its nature of an emerging technique, recently published dedicated validation studies will be given specific attention. Different application areas are addressed, including turbulent flows, aeroacoustics, unsteady wing aerodynamics and other aeronautical applications.Aerodynamic

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Investigations of an aeroelastic oscillator: Analysis of one-degree-of-freedom galloping with combined translational and torsional effects

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Nonintrusive determination of aerodynamic pressure and loads from PIV velocity data (Invited)

Traditionally in aerospace research, pressure is measured with pressure probes or wall-mounted sensors, while integral loads are obtained by means of balance systems. Recent years have seen the emerging and development of an alternative approach, which exploits Particle Image Velocimetry (PIV) data as a source for the nonintrusive determination of pressure fields and fluid-dynamic loads. The essential working principle underlying this approach is that, through invoking the momentum equation, the pressure gradient can be derived from the measured flow acceleration, yielding the pressure field upon spatial integration. Important potential benefits of this approach are, amongst others, that full field pressure data can be obtained and that no instrumentation is required for surface pressure mapping. In addition, it permits velocity and pressure data to be acquired simultaneously, which is relevant in, for example, aero-elastic and aero-acoustic areas. The presentation will address the operating principles and implementation of this method, as well as discuss some applications in areas that are of relevance to the aerospace technology domain.Aerodynamic

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Galloping behaviour of an aeroelastic oscillator with two degrees of freedom

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Integrated silicon flow sensors

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Investigation of large-amplitude 1-DOF rotational galloping

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