Lift-fan aircraft - Lessons learned from XV-5 flight experience

Gerdes, R. M.

doi:10.2514/6.1993-4838

Cited by 8 publications

(1 citation statement)

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“…It has been focused on by various researchers since the 1970s. 1,2 However, different from conventional aircraft, VTOL aircraft is often difficult to achieve long range and large load at the same time due to its special take-off and landing mode. Moreover, considering the stability problems of transitional flight, it is still a huge challenge up to now.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of gas-driven fan propulsion system for fixed-wing vertical take-off and landing aircraft

Zhou

Huang

Xia

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part G:

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As a propulsion system for vertical take-off and landing (VTOL) aircraft, the gas-driven fan propulsion system has received some attention in recent years due to its simple mechanical structure and good performance. During the operation of the propulsion system, the core turbofan exhaust is directed to the tip turbine to drive the ducted fan to obtain thrust, and the louvered vector exhaust device is used to achieve lift/thrust switching. However, due to the linkage characteristics of the guide vanes of the exhaust device, the exhaust area will gradually change with the deflection of the guide vanes. This may cause uncertain effects on the system. Besides, considering the development cost of the propulsion system, it is necessary to clarify whether the core turbofan needs to be redesigned based on the characteristics of the system. Further, the transitional performance (VTOL to flight) of the propulsion system also needs to be studied. To this end, this study established an overall model of the gas-driven fan propulsion system combined with the characteristics of the core turbofan to analyze these problems. The results indicate that the louvered vector exhaust device can well match the gas-driven fan propulsion system. And when the propulsion system is composed, the gas-driven fan will not significantly affect the operation characteristics of the core turbofan. Besides, the preliminary analysis shows that the gas-driven fan propulsion system can meet the power requirements of the transition state of the fixed-wing VTOL aircraft. And the characteristics of the propulsion system may make the take-off thrust-weight ratio requirement of the fixed-wing VTOL aircraft be as low as 1.1.

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Section: Introductionmentioning

confidence: 99%