Experimental and numerical investigations on the lateral stability of a rotorcraft in ground effect

旋翼机地面效应横向稳定性的实验与数值研究

• 批准号: 531573671
• 负责人: Dr. Manuel Keßler
• 金额: --
• 依托单位: Institut für Aeordynamik und Strömungstechnik (IAS)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/531573671?language=en
• 关键词: Experimental; numerical; investigations; lateral; stability

The objectives of the research project are the identification and characterization of different parameters influencing the flight stability of rotor systems as well as the aerodynamic analysis of fundamental feedback mechanisms of the ground vortex system. The fundamental question to be clarified, is in which connection the recirculation or ground vortex topology is related to the loads on the aircraft and whether wind influences lead to a non-linear lateral force on the trimmed rotor. By varying the operating parameters (root cutout, thrust, ground separation, rotor inclination), different operating conditions are to be specifically set. By exciting different ground vortex topologies, their relationship to the occurrence of position loss will also be investigated. The comparison of the simulations with the experiment allows a statement about the necessary settings to be able to achieve an exact reproduction of the rotor wake in hover flight. Furthermore, the numerical simulations allow to investigate details about the ground vortex beyond the limitation of the experimentally used measurement techniques. In particular, temporal backtracking of transient forces becomes possible, which should help to clarify the fundamental causes. In addition, insight into areas that are difficult to access experimentally is made possible, so that experiment and simulation ideally complement each other here.

该研究项目的目标是确定和表征影响旋翼系统飞行稳定性的不同参数，以及对地面涡流系统的基本反馈机制进行气动力分析。需要澄清的基本问题是，再循环或地面涡流拓扑结构与飞机上的载荷之间的关系，以及风的影响是否会导致配平旋翼上的非线性横向力。通过改变操作参数（根部切除、推力、地面分离、转子倾斜度），可以具体设置不同的操作条件。通过激发不同的地面涡拓扑结构，它们与位置损失发生的关系也将被研究。通过模拟与实验的比较，可以说明悬停飞行中实现旋翼尾流精确再现所需的设置。此外，数值模拟允许调查有关地面涡的细节超出了实验使用的测量技术的限制。特别是，瞬态力的时间回溯成为可能，这应该有助于澄清的根本原因。此外，还可以深入了解难以通过实验进入的领域，因此实验和模拟在这里可以完美地相互补充。