Uncertainty Quantification for Laminar Flow Control LFC and Hybrid Laminar Flow Control
// Aerospace // Software // Surface Technologies
Ref-Nr: 17111
Abstract
The invention relates to an aerodynamic body, to be used in the aviation industry. The (hybrid) laminar flow control enables the laminar retention of the boundary layer by suction and thus a very low frictional drag. The suction speed is the most important parameter for effectiveness and efficiency – but it can not be measured directly. The invention includes a methodology with which the uncertainty of all input variables can be systematically taken into account in an indirect determination of the local suction speeds.
Fig. 1: Determination of the local suction-speed incl. uncertainties
background
When designing a suction system, nominally necessary local suction efficiency is calculated by design methods. In all subsequent steps, including the operational phase as well as maintenance and repair, these can then only be determined indirectly. This requires numerous input variables from experiments and simulations and is therefore susceptible to error propagation. Currently, these are not determined, but covered by (relatively large) margins of uncertainty in the design. This approach impairs the economic efficiency of the suction system.
Innovation / Solution
The invention aims at a well-founded, quantitative determination of the local suction speed and its uncertainty with confidence intervals. To do this, four basic steps are applied: 1. Construction of a physically sound, theoretical model of the suction system, 2. Define the input values and parameters of the model, 3. Determine the uncertainties of input values and parameters, for example based on numerical and experimental data, 4. Carry out the simulation to obtain the uncertainties, sensitivities and relevance of individual parameters.Benefits
Well-founded, quantitative determination of the local suction velocity and its uncertainty with confidence intervals
This makes it possible to increase the economic efficiency of the suction system
Influence of defects, determination of relevance, prioritization of development or maintenance work
fields of application
Aviation, Aircraft development, quality control, maintenance and repairYou can close this window. You can find your search results in the previous window
