Cédric DECROCQ : "Aerodynamic study for capability enhancement of artillery ammunition fitted with fins

PhD Works of Cédric Decrocq : "Aerodynamic study for capability enhancement of artillery ammunition fitted with fins"

Abstract : In the field of defence, armies are constantly  increasing  their  operational  requirements to improve  war techniques. In this context, increasing  capabilities  of smart  ammunition at low-cost  is crucial for the military industry.  Studies of innovative  aerodynamic architectures and control deviees are needed to meet these requirements. This thesis is a preliminary design stage which aims at defining  a new long range guided projectile, based on a 155 mm artillery  shell model and fitted  with aerodynamic surfaces. It is part of a multidisciplinary optimization process involving  plenty of parameters  and constraints, which requires  flexible  numerical  techniques, capable of rapidly  estimating aerodynamic coefficients  for a large set of configurations. A bibliographical review is firstly  conducted  with the aim of distinguishing announced, actual and future  performances  of artillery  systems.  An aerodynamic prediction  code based on a RANS­ Potential coupling  was developed  for compressible  subsonic speeds, out of stail conditions.  Theoretical and experimental studies related  to the aerodynamic prediction code are described:  the theoretical section describes main characteristics of the code modelling, while the experimental one assesses conclusions obtained in the theoretical part, by means of wind-tunnel experiments and free-flight tests. An optimisation example  of the retained  concept is finally  proposed in a last section, on the basis of a parametric study consisting of trajectory computations.

 Evaluation committee :

- M. Yannick BAILLY, Professeur des Universités, Université  de Bourgogne - Franche-Comté, PhD Director,
- M. Jean-Claude ROY, Maître de conférences, Université  de Bourgogne - Franche-Comté, Reviewer,
- M. Patrick GNEMMI, Docteur, Habilité à Diriger des Recherches (HDR), Institut Franco-Allemand  de Recherches de Saint-Louis  (ISL), Reviewer,
- M. Bastien MARTINEZ, Docteur, Institut Franco-Allemand  de Recherches de Saint-Louis  (ISL), Reviewer,
- M. Laurent  DALA, Professeur des Universités, Northumbria University, Reporter,
- M.Malick BA, Professeur des Universités, Institut P', ENSMA, Reviewer,
- M. Eric LAMBALLAIS, Professeur des Universités, Institut P' - CNRS - Université  de Poitiers, Reviewer,
- M. Franck CAZAURANG, Professeur des Universités, Université  de Bordeaux, Bordeaux, Reporter

Localization : UFR STGI Département des Sciences-  Rue Chantereine  BP 50547-  90016 BELFORT Cedex  - salle Amphithéâtre Louis Néel