Carlo Salvatore Greco

Image resection and heat transfer measurements by IR thermography in hypersonic flows

This study describes a data reduction technique to estimate heat fluxes in hypersonic flows based on measurements of the temperature distribution on the surface of the model by means of infrared (IR) thermography. IR images are registered using a camera model based on perspective projection approach taking into account lens distortion. Relative displacements between model and IR camera, due to sting mechanical vibrations, can increase the noise. An approach to reduce it, based on single-step discrete Fourier transform and Speed-Up Robust Features methods, is presented. Heat flux is computed with an inverse heat transfer problem applying the trust region reflective algorithm. The proposed data reduction technique is numerically validated and applied to an experimental test carried out in the Hypersonic Test Facility Delft (HTFD) at Mach number equal to 7.5.

NONLINEAR DESIGN OF REINFORCED CONCRETE CONTINUOUS BEAMS

The nonlinear design of reinforced concrete continuous beams, according to Euro-code 2 and CEB Model Code, can be accomplished evaluating the plastic rotations required to obtain the structural compatibility with the loads, and checking that these rotations are lower than the allowable ones. A simplified analysis can be developed by means of the redistribution of the bending moments, as a function only of the depth of the neutral axis at failure. In this paper the problem has been analysed by means of a refined procedure, and the influence of all the parameters which characterize the required plastic rotations is examined. Thus, it is shown that not always the simplified procedure, without compatibility check, is on the safe side; moreover, it is also shown that the redistribution due to the cracking can be very dangerous in the case of steel characterized by low ductility. (Author/TRRL) (Author/TRRL)

Novel Quadruple Synthetic Jet Device: Flowfield and Acoustic Behavior

This paper reports on an experimental investigation of the flowfield and acoustic behavior of an innovative quadruple synthetic jet device operated in different configurations. The device consists ...