An algorithm for the automatic control of boundary layer flow
Abstract
Interest has recently been renewed in the use of distributed suction for the production of laminar flow over substantial areas of the surface of aircraft wings and engine nacelles. Suction may be most efficiently applied by using a number of independently controllable panels through which fluid is withdrawn. It becomes necessary to determine the distribution of suction flowrates that results in a given streamwise location of boundary layer transition with minimum power consumed in providing suction. This problem is formulated here in terms of nonlinearly constrained optimization. An algorithm is presented which has proved successful in both experimental and numerical studies in determining the optimal suction distribution. Of particular concern in this work is the stability of the basic algorithm and the limits to its rate of convergence to the optimal solution.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 May 1994
 Bibcode:
 1994STIN...9436817N
 Keywords:

 Algorithms;
 Automatic Control;
 Boundary Layer Control;
 Boundary Layer Flow;
 Flow Velocity;
 Laminar Boundary Layer;
 Suction;
 Boundary Layer Transition;
 Convergence;
 Numerical Stability;
 Optimization;
 Fluid Mechanics and Heat Transfer