초록 ▼

A method of measuring the state of flow above an airfoil using an estimation of the velocity field based on a combination of Particle Image Velocimetry PIV and multiple surface pressure measurements processed through a POD/mLSE algorithm. Integral to the POD/mLSE algorithm is the estimation of the g

A method of measuring the state of flow above an airfoil using an estimation of the velocity field based on a combination of Particle Image Velocimetry PIV and multiple surface pressure measurements processed through a POD/mLSE algorithm. Integral to the POD/mLSE algorithm is the estimation of the global POD coefficients. The utility of these time dependent coefficients, which are estimated from surface pressure only, are demonstrated in a simple proportional feedback loop (as the time series to drive the actuators) to keep the flow attached. This method requires realistic feedback flow control since surface measurements and not inflow measurements are required for practical applications. The estimation method works well with dynamic strain on flexible bodies and is not limited to estimation from pressure only.

대표청구항 ▼

What is claimed is: 1. A method of determining the instantaneous velocity field of an airfoil, comprising the steps of:taking a plurality of instantaneous pressure measurements from the surface of said airfoil;estimating the random POD coefficients for each said instantaneous pressure measurement;de

What is claimed is: 1. A method of determining the instantaneous velocity field of an airfoil, comprising the steps of:taking a plurality of instantaneous pressure measurements from the surface of said airfoil;estimating the random POD coefficients for each said instantaneous pressure measurement;determining the POD eigenfunctions;combining said random POD coefficients with said POD eigenfunctions to estimate said instantaneous velocity field over said airfoil.