CONTRACAV

In this context, manufacturers are keen to reduce this major energy bill for all rail operators by developing innovative methods of reducing consumption. In more detail, a train's energy consumption is mainly due to the traction chain, from current collection to rimpull, and to auxiliary equipment (air-conditioning units, compressors, electronics, etc.). Traction accounts for the lion's share of energy consumption, of which drag is a major contributor. The solution envisaged to reduce drag is therefore to focus on cavity flows. Passive solutions (deflectors, etc.) are limited by the fact that trains run in both directions, which places severe constraints on the effectiveness of such control systems. Passive control systems are generally efficient for a particular type of flow, but if the flow changes, the control can in most cases become counterproductive. Hence the importance of active control, which can be adjusted or even deactivated as required, while still remaining effective. The main objective of the research work is to develop totally innovative active flow control solutions based on adaptive control strategies requiring information on the state of the aerodynamic field (pressure and/or velocity). In short, the main objective is to develop innovative solutions that will reduce aerodynamic energy consumption by 5 to 10%. The aim of the thesis is, following various wind tunnel proofs of concept on simplified models, to carry out feasibility tests and/or adapt solutions on trains.