Ducted Fan Effect on the Elevation of a Concept Helicopter When the Ducted Faintail Is Located in a Ground Effect Region

摘要

In this study, the effect of the ducted fan, which is located inside the ground effect region, is investigated experimentally according to the helicopter hovering concept. For this investigation, the thrust of the ducted fan is measured using two different experimental methods. In the first method, the static pressure measurement system is used to calculate the thrust. The spring method is used in the second method to calculate the thrust. After these calculations, the lift force of the concept helicopter is determined to investigate the effect of the ducted fan. The main objective of the study is to investigate the ducted fan effect on the elevation of a concept helicopter when the ducted fan is located in the ground effect region. As a result of this study, it appears that the lift force decreases, as expected. However, it is observed that the lift force loss is constant after 2,500 rpm. (C) 2015 American Society of Civil Engineers.