Descrizione del progetto
I metodi matematici colmano le lacune sperimentali nelle prove in galleria del vento del controllo del flusso laminare
La riduzione del flusso d’aria turbolento sulle lamine d’aria è fondamentale per un volo sicuro ed efficiente che riduce al minimo il consumo di carburante. Le tecniche di controllo del flusso laminare sono volte a garantire che l’aria si muova in modo molto ordinato sopra la lamina d’aria, come se si muovesse in infiniti strati paralleli lisci. Lo sviluppo di questi sistemi richiede dei test e il collaudo di strutture così grandi richiede gallerie del vento dotate di hardware e software adeguati per eseguire i test, raccogliere i dati e analizzarli. Il progetto ALVAR, finanziato dall’UE, sta testando un promettente sistema di controllo del flusso laminare in una delle più grandi strutture a bassa velocità del mondo. Il gruppo responsabile del progetto sta sviluppando metodi di analisi in grado di estrarre le portate locali (non misurabili a livello sperimentale) con livelli di incertezza molto ben definiti, che porteranno a una valutazione completa dell’aspirazione sulla superficie della lamina d’aria.
Obiettivo
Laminar Flow Control by means of a suction system appears to be one of the most promising technologies to significantly reduce the pollutant emission of modern large transport aircraft through drag reduction. The consortium, composed of a renowned University (TUBS) and world leading wind tunnel provider DNW, will perform high-quality large-scale wind tunnel tests with a full-scale vertical tail plane equipped with a hybrid laminar flow control (HLFC) system, which is based on the tailored skin single duct (TSSD) concept.
The DNW-LLF is one of the world’s largest low speed facilities and offers unique capabilities for wind tunnel tests with large scale models at representative flow conditions. The framework provided for by ALVAR includes state-of-the-art data acquisition, aerodynamic data, lift, drag, static pressure distributions, transition location with infrared and hot films, and the extremely high flow quality of the LLF 8x6 m test section configuration.
One of the root problems in wind tunnel tests with hybrid laminar flow control is that it is technically unfeasible to actually measure the local suction flow rate over individual surface areas, but only the overall suction flow rate including a number of additional values, such as pressures at certain locations, is feasible. However, the local flow rate can be post processed based on a complex measurement chain, employing data mappings (e.g. calibration of the suction skin) and interpolation/extrapolation schemes. This makes the local flow rate prone to the propagation of uncertainties and errors. ALVAR will therefore provide a scientific analysis of the whole measurement chain to establish a precise uncertainty of the local flow rate. Based on this, and through analysis, the design, optimization and implementation of the main mass flow meter including a proven pumping system to provide stable suction rates a comprehensive quantification of boundary layer suction will be performed by ALVAR.
Campo scientifico
Programma(i)
Argomento(i)
Meccanismo di finanziamento
CS2-RIA - Research and Innovation actionCoordinatore
38106 Braunschweig
Germania