Ambrosiani, Jack P.
Most widely held works by Jack P Ambrosiani
Analysis of a Pulsing Wall Jet ( Book )
1 edition published in 1972 in English and held by 1 library worldwide
An analysis is presented of the mixing characteristics of steady and intermittent blowing when applied for boundary layer control. The analysis considers blowing tangent to the surface of a flap at deflection angles of 0 deg and 40 deg. It is shown that, relative to the steady jet, mixing with the external stream is increased considerably for the intermittent jet. (Author).
Analysis of a Circulation Controlled Elliptical Airfoil ( Book )
1 edition published in 1971 in English and held by 1 library worldwide
The effect of trailing edge blowing on the circulation around an airfoil section is considered theoretically. The analysis is self-contained in that specification of the ambient conditions, flight conditions, and blowing conditions gives the sectional lift and drag coefficients on the prescribed airfoil section. The method of solution is an iterative one, and involves the matching of an assumed sectional lift coefficient with the sectional lift coefficient calculated from the actual pressure distribution over the body in the presence of trailing edge blowing. In order to obtain the pressure on the wall in the wall jet region a full boundary layer analysis is required over the airfoil. The Karman-Pohlhausen integral method is used in the laminar region and the Nash and Hicks turbulent layer analysis is used in the turbulent region. Using the boundary layer properties on the upstream side of the wall jet, along with conservation of mass and momentum relations through the mixing zone, a new wall jet profile is found at the downstream end of the potential core. The wall jet region is then analyzed using integral methods including entrainment. The analysis represents an extension to the calculation method proposed by Kind, and reconfirms the feasibility of obtaining high lift coefficients with relatively low blowing rates. (Author).