ACTIVE CONTROL-JETS · Numerical Investigation of the Active Flow Control of Jets
6РП — Действия „Мария Кюри“
- Период
- 2005-03-01 → 2007-02-28
- Финансиране от ЕС
- 154 510 €
- Участници
- 1
- Схема
- EIF
Линиите свързват координатора с партньорите.
Накратко на български
Потоците въздух около нишата за предното колело и изпускането на реактивните двигатели се анализират чрез компютърни симулации. Това помага за намаляване на шума и съпротивлението на самолета, както и за подобряване на маневреността му.
Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.
Резултати накратко
Final Activity Report Summary - ACTIVE CONTROL-JETS (Numerical Investigation of the Active Flow Control of Jets)
Aeronautical applications of flows over aircraft leading gear bay and jet exhaust flows were investigated by looking at modelling problems of open cavity and planar jets. Powerful computing resources were used to simulate transitional and turbulent low speed flows by Large Eddy Simulation (LES) and Direct Numerical Simulation (DNS) techniques. The development of the flow and its associated noise generation were studied. A simple and practical method of active flow control was successfully implemented for the cavity problem, showing good potential in reducing the drag and noise generation. Linear stability analysis was also applied in order to understand the physics behind the cavity self-sustained oscillations. Moreover, LES and DNS of the isolated planar jet were performed and the obtained results were analysed to enhance the understanding of the physics underlying the development of low-speed jets and sound generation. In particular, the effect of the nozzle exit profile on the jet development and sound generation was studied. LES of the interactions between primary planar jet and small-scaled synthetic jet were also carried out. In the simulations the real geometry of the synthetic jet was replaced by a simplified model of oscillating channel flow. This simplified model was found to be appropriate for the purposes of the current research. It was demonstrated that, as a result of interaction between primary and control jets, the primary jet was vectored towards the control jet, thus potentially increasing the manoeuvrability of the jet engine.
Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз
Цел на проекта
The modification of global characteristics of conventional free jets with the objective of affecting flow direction, cross-stream spreading and mixing is of a considerable interest becuase of the relevance to a number of engineering applications, including thrust vectoring, improved combustion and reduced noise pollution. In this project the numerical approach will be used for further development of a recently proposed method of active flow control relying on an interaction between a primary jet and a smal l-scaled high frequency control jet. The main goal is the derivation of a 'simplified' computational model, capable to reduce significantly the enormous computational effort required by the fully resolved simulation approach. Such simplification is highly desirable for an efficient numerical investigation and for the incorporation of the numerical simulation approach in future improvments of the control method. Emphasis will also be put on clarifying the basic physical mechanism lying in the base of this ac tive contol method, i.e. on the interaction between a primary jet an a localized disturbance of large amplitude.
Оригинален текст от CORDIS (на английски).
Участници
- QUEEN MARY AND WESTFIELD COLLEGE · LONDONКоординаторОбединеното кралство
Връзки
Данни: CORDIS, © Европейски съюз