Performance prediction and progress towards multi-disciplinary design of contra-rotating open rotors

Guérin, Sébastien; Schnell, Rainer; Becker, Richard-Gregor

doi:10.1017/s0001924000009830

Cited by 5 publications

(4 citation statements)

References 31 publications

(57 reference statements)

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“…Similar results are detailed in ref. [120], which shows that a 10% reduction in specific fuel consumption can be expected for an uninstalled open rotor at cruise condition compared to high by-pass ratio turbofan engines. Ref.…”

Section: Gtf Gormentioning

confidence: 90%

A Review of Novel and Non-Conventional Propulsion Integrations for Next-Generation Aircraft

Abu Salem,

Palaia,

Bravo-Mosquera

et al. 2024

Designs

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The aim of this review paper is to collect and discuss the most relevant and updated contributions in the literature regarding studies on new or non-conventional technologies for propulsion–airframe integration. Specifically, the focus is given to both evolutionary technologies, such as ultra-high bypass ratio turbofan engines, and breakthrough propulsive concepts, represented in this frame by boundary layer ingestion engines and distributed propulsion architectures. The discussion focuses mainly on the integration effects of these propulsion technologies, with the aim of defining performance interactions with the overall aircraft, in terms of aerodynamic, propulsive, operating and mission performance. Hence, this work aims to analyse these technologies from a general perspective, related to the effects they have on overall aircraft design and performance, primarily considering the fuel consumption as a main metric. Potential advantages but also possible drawbacks or detected showstoppers are proposed and discussed with the aim of providing as broad a framework as possible for the aircraft design development roadmap for these emerging propulsive technologies.

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Section: Gtf Gormentioning

confidence: 90%

A Review of Novel and Non-Conventional Propulsion Integrations for Next-Generation Aircraft

Abu Salem,

Palaia,

Bravo-Mosquera

et al. 2024

Designs

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“…Fan design literature postulates that contra-rotating fan stages can provide an increase in the pressure ratio and hence fan airspeed and thrust for a given inlet area [14]. Additionally, there are efficiency benefits from the exhaust swirl cancellation.…”

Section: B Contra-rotating Fan (Rdf) Analysismentioning

confidence: 99%

“…Open-rotor or Prop-fan designs can also feature contra-rotation and have been the subject of analysis and prototype testing by Chen and Williams in the 1980's [12] and more recently by Brouckaert, et al [13]. In their paper on the performance prediction of contra-rotating rotors, Guerin et al [14], [16], which is a significant reason why contra-rotating ducted fan technology is attracting increased attention for aerospace vehicle applications, such as the powering of small vertical take-off and landing (VTOL), unmanned and autonomous aerial vehicles. A recent study by Nemnem et al [17], considered the analysis of a contra-rotating, hub-driven ducted fan capable of generating 40 N of thrust with a 20-cm fan diameter and identified current ducted fan pressure ratios to be in a range of 1.02 to 1.16.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Analysis and Design of a Rim-Driven Fan for Fast Flight

Bolam

Vagapov

Day

et al. 2021

Journal of Propulsion and Power

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This paper discusses the aerodynamic analysis and design of a novel, hub-less, contrarotating, Rim Driven Fan (RDF) device. Rim Driven Thruster technology has been utilized for marine propulsion for decades, yet RDF technology has not been comparably developed for aerospace applications. This paper demonstrates that an innovative two stage contra-rotating RDF configuration provides the potential for a significant increase in the available thrust and efflux velocity when compared to existing technologies. The analysis was conducted for an RDF device with a relatively small fan diameter of 120 mm. However, the findings of this study can be equally applied to the performance of much larger and more powerful RDF propulsion units. This would also include devices having multiple contra-rotating paired stages, for example; four, six or more rotors to permit higher-pressure ratios and exhaust airspeeds suitable for large modern aircraft propulsion.

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“…Contra-rotating open rotors (CROR) have a high potential for fuel savings up to 25% compared to equivalent turbofan engines [1]. A drawback of the CROR configuration is the noise emission.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Trailing-Edge Serrations to Reduce Open-Rotor Tonal Interaction Noise

Jaron

Moreau

Guérin

et al. 2017

Journal of Fluids Engineering

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A major source of contra-rotating open rotor (CROR) tonal noise is caused by the interaction of the front-rotor (FR) wakes with the aft-rotor blades. Inspired by chevron nozzles, which increase the mixing process in jet shear layers, serrations are implemented at the FR trailing-edge in order to increase the wake mixing and thus reduce the tones. The depth and width of the serrations are optimized with a multi-objective, metamodel-assisted evolutionary algorithm. For each member, a steady-state Reynolds-averaged Navier–Stokes (RANS) simulation is performed, which is coupled with an analytical noise prediction method in order to evaluate the noise reduction due to the serrations. The results confirm that tonal interaction noise can be reduced by means of trailing-edge serrations. It is found that the major noise reduction mechanism for wake interaction is attributed to increased destructive interferences occurring in spanwise direction. The tonal noise generated through the interaction of the rear rotor (RR) potential field with the FR trailing edge is also slightly reduced because of the circumferential and axial shift of the serrated trailing edge. Furthermore, the present study demonstrates the feasibility of performing an acoustic optimization with a hybrid approach that predicts the noise analytically and extracts the aerodynamic input data from a steady-state RANS flow solution.

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Performance prediction and progress towards multi-disciplinary design of contra-rotating open rotors

Cited by 5 publications

References 31 publications

A Review of Novel and Non-Conventional Propulsion Integrations for Next-Generation Aircraft

A Review of Novel and Non-Conventional Propulsion Integrations for Next-Generation Aircraft

Aerodynamic Analysis and Design of a Rim-Driven Fan for Fast Flight

Optimization of Trailing-Edge Serrations to Reduce Open-Rotor Tonal Interaction Noise

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