Descripción del proyecto
Unos métodos matemáticos llenan las brechas del conocimiento en pruebas de control de flujo laminar en túneles de aire
Reducir los flujos de aire turbulento en los perfiles alares es fundamental para un vuelo seguro y eficiente que minimice el consumo de combustible. Las técnicas de control de flujo laminar pretenden garantizar que el aire se mueve de forma muy ordenada sobre el perfil alar, como si se moviera en una infinidad de capas paralelas suaves. Desarrollar estos sistemas requiere pruebas, y probar estructuras grandes precisa del uso de túneles de viento equipados con el «hardware» y el «software» adecuados para realizar las pruebas, recopilar los datos y analizarlos. El proyecto financiado con fondos europeos ALVAR realiza pruebas con un sistema de control de flujo laminar prometedor en una de las instalaciones de baja velocidad más grandes del mundo. El equipo está desarrollando métodos de análisis capaces de extraer tasas de flujo local (que no se pueden medir en experimentos) con unos niveles de incertidumbre muy bien definidos, lo que conlleva una evaluación exhaustiva de la succión sobre la superficie del perfil alar.
Objetivo
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.
Ámbito científico
Programa(s)
Régimen de financiación
CS2-RIA - Research and Innovation actionCoordinador
38106 Braunschweig
Alemania