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- Recent Developments in Computer Modeling, Material Characterization and Experimental Validation With Respect to Crash Dynamics
- The presented paper's goal is to give a brief overview of recent numerical and experimental developments performed for ten years by the ONERA/DMSE/RCS, aiming at improving structures conception with respect to crashworthiness, ditching, impact or explosion hardening considerations. One of ONERA Research goals is to improve the material characteristics and,...
- White papers 2004-12-07
- HART II: Experimental Analysis and Validation of ONERA Methodology for the Prediction of Blade-Vortex Interaction
- In the first part of this paper, the ONERA methodology concerning the post-processing of the PIV data obtained during the HART II campaign is described. The vortex geometry and the vortex parameters are studied for different configurations. In the second part, the validation of the different steps of the ONERA...
- White papers 2004-10-04
- Modeling of the Ignition Inside a Turbojet Combustor: Application to In-Flight Relight
- In the paper, the numerical model is presented in detail, and some examples of its application to the experimental configuration are discussed. At high altitude, the operating critical conditions make the ignition and the relighting of jet engine combustors more difficult to control. The objective of ONERA is to develop...
- White papers 2004-10-04
- Modeling of Internal Two-Phase Flow Field Inside a Turbojet Combustion Chamber. Application to In-Flight Relight
- The study presented in this paper is conducted in the frame of turbojets combustion chambers optimization by the increase of efficiency and the reduction of polluting emissions. The operating critical conditions at high altitude make it more difficult to control both the ignition and the re-light process after an accidental...
- White papers 2004-10-01
- Structural Loading of a Complete Aircraft Under Realistic Crash Conditions: Generation of a Load Database for Passenger Safety and Innovative Design
- The proposed paper presents hard landing simulations of large aeronautical structures using explicit F.E. codes, such as RADIOSS. The main technical difficulties arise from the dimensions and the complexity of the structures to model on the one hand, and from the complexity of the very local ruin phenomena on the...
- White papers 2004-10-01
- Numerical Simulations Around Wing Control Surfaces
- In this paper a study of wing control surface effectiveness was carried out using numerical simulations with the advanced Reynolds Averaged Navier-Stokes solver elsA. Non-coincident meshing techniques were used as to make t he mesh generation process more flexible. The first application attempts to predict an aileron effectiveness using the...
- White papers 2004-09-30
- Evaluation of Finite Element Modeling Methodologies for the Design of Crashworthy Composite Commercial Aircraft Fuselage
- This paper aim at developing methodologies to design crashworthy composite commercial aircraft fuselages, a 2 frames section based on the A321 AIRBUS standard dimensions was manufactured by AIRBUS France, in order to be crash-tested at the Toulouse Aeronautical Test Centre. Though most p re-test numerical analyses confirmed this expected rupture...
- White papers 2004-09-30
- Application of CFD to the Computation of Complex Rotorcraft Configurations
- This paper presents typical results which were obtained at ONERA during the past years of the CHANCE program, which aims at the development and validation of CFD tools for computing the aerodynamics of the complete helicopter, taking into account the coupling with blade dynamics. The results presented concern elsA computations...
- White papers 2004-09-24
- Experimental Investigations of Rotor-Fuselage Aerodynamic Interactions Using a Helicopter Powered Model
- This paper presents wind tunnel experiments of helicopter rotor-fuselage interactions. Several test campaigns have been conducted in the ONERA F1 subsonic wind tunnel on a Dauphin 365N model equipped with a powered main rotor. Numerous measurements have been performed during these tests: time-averaged and time-dependent fuselage pressure measurements, 6-components balance...
- White papers 2004-09-24
- Application of the Kalman-Particle Kernel Filter to the Updated Inertial Navigation System
- This paper considers a new nonlinear filter which combines the good properties of the Kalman filter and the particle filter. Compared with other particle filters like Rao-Blackwellised particle filter RBPF, it adds a local linearization in a kernel representation of the conditional density, which yields a Kalman type correction complementing...
- White papers 2004-09-24
- Heat Flux Determination on Hypersonics Vehicles With an Inverse Method: First Validation Step
- The aim of this paper is to determine the heat fluxes received on the space vehicle wall starting from the temporal evolution of its internal face thermal map. This technique is non intrusive and measurement zones are not directly exposed to the external aggressive conditions. The ground validation phase of...
- White papers 2004-09-17
- Comparative Jet Noise Computations Using a Coupled CFD-Acoustic Solution
- The paper emphasizes approaches based on LES simulations of the jet near field coupled with acoustic radiation codes. In the past years, several jet configurations have been studied at ONERA and compared to experimental results. These include the following three jets: Seiner & Ponton, hot supersonic jet, ONERA 80mm hot...
- White papers 2004-09-13
- Rear Infrared Thermography in Heat Fluxes Determination on Hypersonics Vehicles
- Due to aggressive external conditions during a hypersonic flight, parameters such as external wall temperature are not easily measurable with the usual approach. Hence this study develops a promising in flight measurements methodology to estimate heat fluxes on space vehicle external surface, in order to improve the aerodynamic models. One...
- White papers 2004-09-15
- Computation of Fan Tone Noise Generation and Radiation From Engine Inlets
- In this paper a source-to-far-field computation chain aiming at predicting the noise generated by rotor-stator fan interactions and radiated from the inlet is presented. It is applied to a turbofan model, tested in DNW -LLF anechoic wind tunnel in the framework of DUCAT project. Interaction noise sources are assessed by...
- White papers 2004-09-13
- Numerical Simulation of Aerodynamic Noise
- This paper presents a survey of significant steps towards the development of a CFD/CAA hybrid methodology aiming at the numerical prediction of the aerodynamic self-noise of complex 3D airfoils. This approach is based on the combination of several up to three numerical methods, each one simulating specific fluid mechanisms (unsteady...
- White papers 2004-09-13
- Aeroelasticity and Parametric Uncertainty Propagation: An Hybrid Approach
- Uncertainty effects on the stability of fluid-structure coupled systems have been investigated at ONERA for more than a decade. This paper focuses on stability of the coupled system aircraft /aerodynamics which is a key issue in civil airplane manufacturing. During the design stage of an airplane, many structural parameters are...
- White papers 2004-09-13
- Active Vibration Control of an Aeronautical Panel Using a Decentralized Approach
- This paper summarizes numerical and experimental works carried out to actively control broadband vibrations of a stiffened panel by using a decentralized feedback method. The local control loops are composed of piezo ceramic patches as actuators, accelerometers as sensors and control laws as internal model control feedback. The choice of...
- White papers 2004-09-13
- State-of-the-Art of the Supersonic Aerodynamics Project at ONERA
- At the beginning of 2000, ONERA launched an internal project aimed at investigating a few aerodynamic problems linked to the future supersonic aircraft. Five topics are studied: laminar-turbulent transition and laminar flow control; development of a "quiet" supersonic wind tunnel; turbulent flows at high values of Reynolds number; shock wave/boundary...
- White papers 2004-09-09
- Numerical Simulation Behind an A300 Airbus Model
- The development of wake vortex behind an A300 Airbus model in high-lift configuration is computed by solving the unsteady Navier-Stokes equations for an incompressible fluid with a second order accurate scheme in time and space. The study is focused on the way of initializing the computational entrance based on the...
- White papers 2004-09-10
- Aerodynamic and Aero-Acoustic Optimization of Modern Tilt-Rotor Blades Within the ADYN Project
- Among the funded projects that aim at developing a new concept of tilt-rotors, the pre-competitive ADYN project (Advanced European tilt-rotor for Dynamics and Noise) has the objective to study the dynamic and acoustic problems of the ERICA concept proposed by AGUSTA. This paper presents the work package 3 (WP3) of...
- White papers 2004-09-09
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