Showing papers in "Progress in Aerospace Sciences in 2010"

TL;DR: In this article, a review of the recent progress in flapping wing aerodynamics and aeroelasticity is presented, where it is realized that a variation of the Reynolds number (wing sizing, flapping frequency, etc.) leads to a change in the leading edge vortex (LEV) and spanwise flow structures, which impacts the aerodynamic force generation.

TL;DR: A review of currently used inspection methods is presented and some examples are described where Lamb wave based scanning techniques have been used to identify internal damage in multi-layered composite structures in this article.

TL;DR: A review of the state of the art and present status of active aeroelastic rotor control research for wind turbines is presented in this paper, where the authors discuss the potential of load reduction using smart rotor control concepts.

TL;DR: A summary of research efforts for last several years on fluid-dynamics and aero-optics of hemisphere-on-cylinder turrets with flat and conformal windows is presented in this article.

TL;DR: In this article, a comprehensive review of uncertainties involved in flight vehicle structural damage monitoring, diagnosis, prognosis and control is presented, which can cause infeasibilities, false diagnosis and very imprecise prognosis.

TL;DR: There has been considerable progress in the Fourier harmonic modeling method development for turbomachinery applications as discussed by the authors, and the main driver is to develop efficient and accurate computational methodologies and working methods for prediction and analysis of unsteady effects on aerothermal performance (loading and efficiency) and aeroelasticity (blade vibration due to flutter and forced response).

TL;DR: In this paper, an account on the experimental determination of the wall position relative to the probe in wall-bounded turbulent flow studies is given. And a thorough review on common measurement techniques is presented.

TL;DR: In this paper, the integration of the various air particle separation technologies (EAPS) with the helicopter turboshaft engines is discussed. And a first-order filter theory is derived to predict filter performance as a function of key parameters and useful operation time.

TL;DR: The recent progress in design optimization using evolutionary algorithms to solve real-world aerodynamic problems is reviewed, including hybridized approaches to speed up the convergence rate of EAs and data mining of Pareto-optimal solutions.

TL;DR: In this paper, a new hybrid approach to model high Reynolds number wall-bounded turbulent flows is developed based on coupling a two-level simulation (TLS) approach (Kemenov and Menon, 2006 [1], 2007 [2] in the inner region with conventional large eddy simulation (LES) away from the wall.

TL;DR: In this paper, a regenerative cooling mechanism is proposed for aerospike nozzles in a hybrid rocket motor to increase the life and operating range of the nozzle.

TL;DR: In this paper, the authors investigated the viscosity effects on weak shock wave reflection with the Navier-Stokes and DSMC flow solvers, and showed that the existence of a viscous zone in the region of shock-wave interaction allows a continuous transition from the parameters behind the Mach stem to the reflected shock.

TL;DR: The use of level sets in premixed turbulent combustion, aero-acoustics, geometry definition/morphing, meshing and turbulence modeling is explored in detail and other applications discussed in this article.

TL;DR: In this paper, a computational viewpoint on the problems of design and numerical simulation for the nozzles of modern aircraft turbofan engines is presented, including simulation of near and far field of a nozzle, for generation of input perturbations and for processing the far-field noise.

TL;DR: In this article, the potential-flow vortex wake of a circular cylinder in cross-flow is examined and similarities to the wake of the axisymmetric body at incidence are discussed, and it is argued that the vortex trajectories are fixed at a given angle of attack and shifted upstream or downstream by the initial disturbance.

TL;DR: Algebraic truncation models were derived for the turbulent energy flux for high-speed shear flows with and without thermal and mechanical non-equilibrium effects in this article, which provided significant improvements, up to 20%, in the temperature predictions over the gradient diffusion model for equilibrium flows over a Mach number range of 0.02-11.8.

TL;DR: In this paper, the authors show the common existence of a supersonic jet structure locally embedded within a surrounding transonic flow field in the hitherto unrelated phenomena of unstable gaseous detonation and hypervelocity blunt body shock wave interaction.

TL;DR: In this article, the authors compare the expressions derived by Hornung to compare with inviscid computational fluid dynamics simulations of a Mach 8 flow over a cylinder, using a finite-rate vibrational relaxation model to simplify the comparisons with theory.

TL;DR: In this paper, the effect of nonequilibrium recombination after a curved two-dimensional shock wave in a hypervelocity dissociating flow of an inviscid Lighthill-Freeman gas is considered.