System Reliability Analysis of HLFC Suction System Architectures


Virtuelle Integration und Systembewertung





Art der Publikation:



Timo Pe, F. Thielecke


Proceedings of the 4th International Workshop on Aircraft System Technologies (AST 2013)


ISBN 978-3-8440-1850-9

Vollständiges PDF:


Hybrid Laminar Flow Control (HLFC) is a promising technology due to its large reductions in skin friction drag. There have been great effort in aerodynamic research over the last decades. Coming closer to a possible integration of the technology into passenger aircraft, the investigation of the suction system, structure and manufacturing becomes more important in research and development. Failures and conditions leading to loss of laminarity result in an increase in fuel burn and could cause a temporary asymmetric flight condition. An increase in fuel burn can be compensated by additional contingency fuel, which decreases the aircraft efficiency. However, if not enough contingency fuel is available, the operational reliability decreases and diversion flights become more frequent. The complex dependencies of failure modes, system reliability, mission fuel planning and operational reliability have to be analyzed on overall aircraft level or even fleet level, but unfortunately there is little knowledge about these dependencies. This paper tries to clarify the aspect of HLFC system reliability. Therefore all failure modes and conditions that lead to a loss of laminarity are summarized in a first step. Their effects on aircraft safety and operational reliability are further presented. Finally a system reliability study is conducted using the tool SyRelAn. Different architectures and redundancy concepts are analyzed and discussed.