Abstract
As a kind of VTOL technology, ducted fan is not only used by many kinds of aircrafts, but also one of the trends of the future aircraft lift system, and attracts more and more attention. For an engine driven ducted fan lift unit, involving the engine and ducted fan matching problem, the form of transmission and transmission ratio are the key design parameters. In order to design and develop a ducted fan aircraft reasonably, a thrust test platform was set up to connect the engine with the ducted fan through the belt driving. The matching relationship between the engine and the transmission system was experimentally studied and the optimal transmission ratio was determined. The results showed that the optimal transmission ratio for the engine 1 is 2.2:1, and for the engine 2, the optimal transmission ratio should be 2.95:1 based on the current ducted and movable blade aerofoil design. At this time, the lift will exceed 130 kg•f, meeting the aircraft's original design requirements.
Highlights
The traditional fixed-wing aircraft, which requires high starting conditions and poor manoeuvrability, ducted fan-powered aircraft has high-speed flying and hovering ability, as well as VTOL (Vertical Take-off and Landing) capability, less affected by the environment and good manoeuvrability, and has a wide range of applications, has become one of the important research hot spots [1,2,3,4]
Ohanian III[3] investigated the potential of using Synthetic Jet Actuators (SJA) to control the flight stability of ducted fans
Will[4] experimentally studied the aerodynamic characteristics of various ducted lip shapes, including the leading edge radius of the ducted lip and the culvert wall thickness, and found that the smaller leading edge radius favours the stability under take-off and crosswind conditions, whereas the larger leading edge radius enhances the stability under static conditions
Summary
The traditional fixed-wing aircraft, which requires high starting conditions and poor manoeuvrability, ducted fan-powered aircraft has high-speed flying and hovering ability, as well as VTOL (Vertical Take-off and Landing) capability, less affected by the environment and good manoeuvrability, and has a wide range of applications, has become one of the important research hot spots [1,2,3,4]. NASA studied the ducted fan aerodynamic characteristics and flow characteristics through the wind tunnel test. Pflimlin[5] designed an attitude control method based on a linearization of the dynamics model to control the balance stability of hovering of ducted fan micro UAVs in crosswind. The lift unit formed by the engine-driven ducted fan relates to the match between the engine and the ducted fan, and the form of the transmission and the setting of the transmission ratio are directly related to the design of the aircraft and the performance of the aircraft. A thrust test platform was set up which connected the engine with the ducted fan through the belt drive. The aerodynamic characteristics of the ducted fan in the hovering state were measured. A design idea of lift unit transmission system for engine-driven ducted fan was established and the transmission ratio was optimized, and evaluated the.
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