Next Generation NASA GA Advanced Concept

Hahn, Andrew S.

doi:10.4271/2006-01-2430

Cited by 10 publications

(5 citation statements)

References 5 publications

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“…However, no small GA aircraft in series production features ducted fan propulsion due, in part, to its adverse effect on efficiency, as well as nacelle integration problems. More recently, several new projects have been and are being pursued in this field [4,19,22], among them the Airbus E-Fan [27] and the Silent Air Taxi [16].…”

Section: Introductionmentioning

confidence: 99%

Ducted fans for hybrid electric propulsion of small aircraft

et al. 2022

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This paper presents a method for modeling ducted fan propulsion systems for hybrid-electrically driven small aircraft based on mean line flow analysis methods. Studies of the essential design parameters provide the basis for a discussion of potential advantages when compared to free propellers, as well as possible new fields of application for the ducted fan. A two-seater aircraft, equipped with two ducted fans powered by a combustion engine and additionally by a parallel hybrid electric start-boost drive, is used as a reference application case. The fan performance characteristics are described with the aid of aero mean line flow analysis methods and semi-empirical loss correlations. Physics-based methods are applied to assess the nacelle drag and noise emissions. The combustion engine and electric motor performance are described using maps. The ducted fan design variables are investigated to identify the main trade-offs and favorable designs for the target aircraft mission, with special attention to noise. The results show that the performance of fixed pitch fans benefits strongly from hybridization. Ducted fans can also operate considerably more quietly than is required by current certification standards. The physics-based design method presented here can be used for conceptual design and performance prediction of ducted fan propulsion systems, which may be especially interesting if low noise emissions are required.

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Section: Introductionmentioning

confidence: 99%

Ducted fans for hybrid electric propulsion of small aircraft

et al. 2022

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“…These factors play a vital role in determining the preferred mode of transportation through their trade-offs. As suggested by Hahn, the demand for travel is often constrained by the time budget while the choice of travel mode is regularly dictated by the traveler's financial budget [2].…”

Section: Introductionmentioning

confidence: 99%

Personal air vehicle (PAVE) application in Malaysia

Romli

Yaakob

2014

2014 International Conference on Advanced Logistics and Transport (ICALT)

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Transportation has become a huge necessity in our life today, which is instrumental to create greater socioeconomic opportunities. As the world progresses, transportation systems will undergo paradigm shifts to suit with changing requirements. Personal transportation is often preferred to the public transport and to date, most of them have been made on the ground through roads. However, with the increasing traffic volume, the average time spent travelling on roads has significantly increased for the same amount of distance travelled. It has already been proposed that utilization of the possible third dimension of transportation system, which is the air transport, can facilitate in supporting the personal transportation and subsequently alleviate this problem. This notion gives birth to the design concepts of the personal air vehicle (PAVE) that is envisioned to operate synergistically with ground and air infrastructures. This paper aims to preliminarily study and analyze the potential benefits of having PAVE option in Malaysia for domestic travel and how its performance will fare in comparison to the existing ground transportation options. The results of travel time and cost comparisons highlight the potential of PAVE application for the domestic transportation in Malaysia, particularly for personal travel need.

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“…For example, some people are mainly concerned on how much they have to pay for the transportation regardless of the time taken to travel while others may think the opposite. It has been suggested that travel demand is typically constrained by the time budget while the choice of travel mode is frequently dictated by the traveler's financial budget (Hahn, 2006).…”

Section: Introductionmentioning

confidence: 99%

Analysis and anticipation of inbound tourism market for Jiangmen

Xiao¹

2015

Engineering Management and Industrial Engineering

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Point-to-point travel refers to the trip taken from the initial departure point to the final destination point, which can be further categorized as either direct or non-direct. Direct point-to-point travel indicates that the trip is made with a single transportation mode from beginning until the person reaches the final destination. On the other hand, the non-direct type of point-to-point travel involves several modes of transportation throughout the journey. Comparison analysis is made between the available modes of domestic transportation such as buses, trains, commercial flights and cars to determine the preference and the market potential for direct point-to-point travel means. Several evaluation criteria including time on transport, time of waiting, cost of transport, cost of other expenses, travel comfort, flexibility of departure point and privacy are used in this study. Based on the result from case studies of domestic travel in Malaysia, it shows that direct point-to-point means of transportation represented by cars generally have higher benefits in comparison to other means of transportation, especially in terms of time and travel costs. This signifies a big potential in introducing a better means of direct point-to-point transportation than current cars like the dual-mode Personal Air Vehicle (PAVE) for domestic travel in Malaysia.

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Next Generation NASA GA Advanced Concept

Cited by 10 publications

References 5 publications

Ducted fans for hybrid electric propulsion of small aircraft

Ducted fans for hybrid electric propulsion of small aircraft

Personal air vehicle (PAVE) application in Malaysia

Analysis and anticipation of inbound tourism market for Jiangmen

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