Aerodynamic optimization of a large PrandtlPlane configuration

Cappelli, Lorenzo; Costa, Giulio; Cipolla, Vittorio; Frediani, Aldo; Oliviero, Fabrizio; Rizzo, Enzo

doi:10.1007/bf03404725

Cited by 8 publications

(8 citation statements)

References 6 publications

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“…When a new current* configuration is set, with f (current*) > f(record), the algorithms counts the no improvement parameter NoImpr=NoImpr +1; the procedure is stopped when no improvements are observed within the maximum number of search attempts N max set in the pre-processor, and the last record configuration coincides with the global optimum. The detailed description of the mathematics of the procedure is described in [26,37,38].…”

Section: Optimization Strategymentioning

confidence: 99%

Tools and methodologies for box-wing aircraft conceptual aerodynamic design and aeromechanic analysis

Salem

Palaia

Cipolla

et al. 2021

Mechanics & Industry

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A way to face the challenge of moving towards a new greener aviation is to exploit disruptive aircraft architectures; one of the most promising concept is the PrandtlPlane, a box-wing aircraft based on the Prandtl's studies on multiplane lifting systems. A box-wing designed accordingly the Prandtl “best wing system” minimizes the induced drag for given lift and span, and thus it has the potential to reduce fuel consumption and noxious emissions. For disruptive aerodynamic concepts, physic-based aerodynamic design is needed from the very early stages of the design process, because of the lack of available statistical data; this paper describes two different in-house developed aerodynamic design tools for the PrandtlPlane conceptual aerodynamic design: AEROSTATE, for the design of the box-wing lifting system in cruise condition, and THeLMA, aiming to define the layout of control surfaces and high lift devices. These two tools have been extensively used to explore the feasible space for the aerodynamic design of the box-wing architecture, aiming to define preliminary correlations between performance and design variables, and guidelines to properly initialize the design process. As a result, relevant correlations have been identified between the rear-front wing loading ratio and the performance in cruise condition, and for the rear-front flap deflections and the aeromechanic characteristics in low speed condition.

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Section: Optimization Strategymentioning

confidence: 99%

Tools and methodologies for box-wing aircraft conceptual aerodynamic design and aeromechanic analysis

Salem

Palaia

Cipolla

et al. 2021

Mechanics & Industry

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“…The main information obtained from the conceptual design initialisation is the first estimation of the aircraft maximum take-off weight, which is useful to start the second level of the aircraft design process (Figure 2). In particular, in this stage, the aerodynamic design is driven by an optimisation procedure implemented in an in-house tool called AEROSTATE [56][57][58]; the schematic representation of the AEROSTATE code is reported in Figure 3. design is driven by an optimisation procedure implemented in an in-house tool called AEROSTATE [56][57][58]; the schematic representation of the AEROSTATE code is reported in Figure 3.…”

Section: Optimisation Driven Preliminary Designmentioning

confidence: 99%

“…In particular, in this stage, the aerodynamic design is driven by an optimisation procedure implemented in an in-house tool called AEROSTATE [56][57][58]; the schematic representation of the AEROSTATE code is reported in Figure 3. design is driven by an optimisation procedure implemented in an in-house tool called AEROSTATE [56][57][58]; the schematic representation of the AEROSTATE code is reported in Figure 3. The general constrained aerodynamic optimisation problem addressed in this tool is summarised in the following Equations ( 10)-( 12):…”

Section: Optimisation Driven Preliminary Designmentioning

confidence: 99%

“…Aerospace 2021, 8, x FOR PEER REVIEW 6 of 39 design is driven by an optimisation procedure implemented in an in-house tool called AEROSTATE [56][57][58]; the schematic representation of the AEROSTATE code is reported in Figure 3. The general constrained aerodynamic optimisation problem addressed in this tool is summarised in the following Equations ( 10)-( 12):…”

Section: Optimisation Driven Preliminary Designmentioning

confidence: 99%

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A Physics-Based Multidisciplinary Approach for the Preliminary Design and Performance Analysis of a Medium Range Aircraft with Box-Wing Architecture

et al. 2021

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The introduction of disruptive innovations in the transport aviation sector is becoming increasingly necessary. This is because there are many very demanding challenges that the transport aviation system will have to face in the years ahead. In particular, the reduction in pollutant emissions from air transport, and its impact on climate change, clearly must be addressed; moreover, sustainable solutions must be found to meet the constantly increasing demand for air traffic, and to reduce the problem of airport saturation at the same time. These three objectives seem to be in strong contrast with each other; in this paper, the introduction of a disruptive airframe configuration, called PrandtlPlane and based on a box-wing lifting system, is proposed as a solution to face these three challenges. This configuration is a more aerodynamically efficient alternative candidate to conventional aircraft, introducing benefits in terms of fuel consumption and providing the possibility to increase the payload without enlarging the overall aircraft wingspan. The development and analysis of this configuration, applied to a short-to-medium range transport aircraft, is carried out through a multi-fidelity physics-based approach. In particular, following an extensive design activity, the aerodynamic performance in different operating conditions is investigated in detail, the structural behaviour of the lifting system is assessed, and the operating missions of the aircraft are simulated. The same analysis methodologies are used to evaluate the performance of a benchmark aircraft with conventional architecture, with the aim of making direct comparisons with the box-wing aircraft and quantifying the performance differences between the two configurations. Namely, the CeRAS CSR-01, an open-access virtual representation of an A320-like aircraft, is selected as the conventional benchmark. Following such a comparative approach, the paper provides an assessment of the potential benefits of box-wing aircraft in terms of fuel consumption reduction and increase in payload capability. In particular, an increase in payload capability of 66% and a reduction in block fuel per pax km up to 22% is achieved for the PrandtlPlane with respect to the conventional benchmark, while maintaining the same maximum wingspan.

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“…The aircraft payload was increased as much as possible maintaining the maximum allowable dimensions (80 × 80 meters); the wing planform was designed in such a way to increase the aerodynamic efficiency under the constraints of trim, stability (flight mechanics) and low-speed requirements. Especially for concurrent high MTOWs and lower wing-loadings, the introduction of a third small wing (which the optimizer was placing as canard or tail, see Figure 90 and also reference [50,51]) led to configurations better complying with stability requirements, and, most important, satisfying low-speed needs with traditional high-lift devices (double slotted on the front wing, single slotted on the rear one), with a negligible price in terms of aerodynamic efficiency. The introduction of a canard was also suggested by Wolkovitch on Diamond Wings [356].…”

Section: Very Large Freightermentioning

confidence: 99%

Challenges, Ideas, and Innovations of Joined-Wing Configurations: A Concept from the Past, an Opportunity for the Future

Cavallaro

Demasi

2016

Progress in Aerospace Sciences

122

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Aerodynamic optimization of a large PrandtlPlane configuration

Cited by 8 publications

References 6 publications

Tools and methodologies for box-wing aircraft conceptual aerodynamic design and aeromechanic analysis

Tools and methodologies for box-wing aircraft conceptual aerodynamic design and aeromechanic analysis

A Physics-Based Multidisciplinary Approach for the Preliminary Design and Performance Analysis of a Medium Range Aircraft with Box-Wing Architecture

Challenges, Ideas, and Innovations of Joined-Wing Configurations: A Concept from the Past, an Opportunity for the Future

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