Alternative or novel ventilation concepts have gained more and more interest in the aircraft industry over the last years for various reasons: First of all, the trend of increasing heat loads (on-board entertainment, passenger density, etc.) generates a need for efficient ventilation concepts that conventional mixed ventilation cannot satisfy under comfortable conditions. In addition, alternative concepts such as cabin displacement ventilation allow for more flexible cabin layouts and therefore contribute to improving efficient industrial processes. And, as a third point, duct lengths and thus weight can be reduced. Moreover, by adjusting the amount of fresh air, bleed air and consequently energy can be saved. Both measures lead to reduced fuel consumption.
For this reason, novel ventilation concepts are being developed and tested – both experimentally and numerically — in a cabin mockup of a long-range aircraft by the DLR Institute for Aerodynamics and Flow Technology within the framework of the Clean Sky 2 project ADVENT. The design and set-up of the mock-up are also part of the project and special attention will be given to the possibility to precisely define the thermal and fluid dynamical boundary conditions. On the one hand, experimental simulations of real operational conditions can be performed using temperature-controlled surfaces and, on the other hand, precise numerical simulations of these operational conditions — by means of suitable idealization of the inflow velocity profiles and the boundary conditions — can be realized. While most of the existing studies on aircraft cabin ventilation just consider the performance under steady conditions, the dynamic performance under real conditions is also of high relevance. Therefore, the Institute of Aerodynamics and Flow Technology is also investigating the performance of the ventilation scenarios under dynamic conditions and in case of a non-ideal distribution of the heat loads within the scope of the ADVENT project.