Design of swirl recovery vanes in a slipstream of limited extension

The angular momentum or swirl in the propeller slipstream is an energy loss. An effective method to recover the swirl and increase the propulsive efficiency is to use Swirl Recovery Vanes (SRVs). Former research showed an over-prediction in SRV thrust by a lifting line theory (LLT) model compared to wind tunnel experiments. The LLT model assumes...

Aerodynamic modelling of open rotor-wing-flap interactions with low-fidelity methods

The advent of distributed electric propulsion aircraft concepts requires novel physics-based analysis methods for the modeling of the complex aerodynamic interactions between the closely coupled rotor, wing, and flap. For this purpose, the analysis tool Open Rotor-Wing-Flap Interaction Solver (ORWFIS) is developed with existing and novel low...

2D modeling approach for propeller-wing-flap interaction

There is renewed interest into propeller-driven aircraft to improve fuel economy. Some novel concepts such as distributed electric propulsion (DEP) use propellers for lift augmentation. Low-order methods are required to quickly determine designs with improved high-lift performance. A 2D tool may be required to “tune” a 3D inviscid model such as...

Propeller Slipstream Correction for Wind Tunnel Applications: A panel method approach to model propeller induced rotational flow for aircrafts in mid/high thrust condition

In the post processing of acquired wind tunnel force measurements, propeller-driven aircrafts need a preliminary correction of the propeller slipstream. Propeller slipstream effect has two major contributions to the flow field. The first one is the increase in dynamic pressure and the second is the addition of rotation in the flow field. Without...

Swirl Recovery Vanes for Propeller Propulsion Systems: An Aerodynamic and Aeroacoustic Investigation by Lattice Boltzmann Method

An unexploited rotational momentum, i.e. swirl, is present in the slipstream of propellers. Stationary vanes, called swirl recovery vanes (SRVs), have been proven to be effective in increasing the propulsive efficiency of propellers. There is however no conclusive answer in literature on the noise effect of SRVs. Additionally, as the propeller...

Aerodynamic and Aeroacoustic Interaction Effects for Tip-Mounted Propellers: An Experimental Study

Propellers can enable a significant reduction in energy use of future aircraft by offering a higher propulsive efficiency than turbofan engines. This is especially relevant for a new generation of (hybrid-)electric aircraft. However, the integration of propellers with the airframe remains a challenge, and leads to performance and noise penalties...

Design of Swirl Recovery Vanes for Wing-Mounted Tractor Propeller Propulsion System

Increasing pressure of reducing fuel consumption has led to renewed interests in propeller propulsion devices for their high propulsive efficiency. In a propeller propulsion system, the torque applied to the propeller results in angular momentum in propeller slipstream. This angular momentum is not only a form of energy loss that does not...

Assessment of Conceptual High-Capacity Regional Turbopropeller Aircraft

Designers are motivated to create more a efficient aircraft design following the growth of the market and environmental restrictions. As a result new interest in propeller-powered aircraft as such engines show higher theoretical propulsive efficiency as compared to turbofan engines. <br/><br/>The employment of turboprop engines on commercial...

Analysis of propeller slipstream effects on the directional stability using a potential flow model

Modelling the Propeller Slipstream Effect on the Longitudinal Stability and Control

As the aviation industry continues to strive for improvements in fuel efficiency throughout the entire aircraft design, interest has been renewed in propeller engines. New research into advanced turboprop engines, so-called open rotor engines, seems promising as they combine the inherent high propulsive efficiency of ordinary turboprop engines,...

Design and Analysis of Swirl Recovery Vanes for an Isolated and a Wing Mounted Tractor Propeller

In light of the energy crisis of the early 1970's, NASA and industry gained a renewed interest in high-speed propellers for improved propulsive efficiency and explored the idea of swirl recovery vanes (SRV) to generate a net thrust from the residual swirl in the propeller slipstream. After this first effort on the aerial application of SRV, only...

A method for the determination of the effect of propeller slipstream on static longitudinal stability and control of multi-engined aircraft

SAMID, an interactive system for aircraft drag minimization studies. Mathematical models and methods

An interactive computer program system has been developed that can be used in aircraft drag minimization studies. It comprises algorithms for choosing the spanwise distributions of lift, pitching moment, chord and thicknessto-chord ratio of lifting elements. The choices are optimal in that they minimize induced plus viscous drag while satisfying...

Progress report of the development of a system for the numerical simulation of Euler flows, with results of preliminary 3D propellersllpstream/exhaust-jet calculations

Evaluation of Thing's method for the calculation of the lift discription on a wing in propulsive jets

The calculation method presented by Ting, Liu and Kleinstein in reference 3 has been subjected to an evaluation study, principally on the basis of experimental data obtained from special experiments on a half wing immersed in two jets. Very satisfactory results were found for the unflapped wing lying centrally within the jets. Both flap...

Evaluation of Levinsky's method for the calculation of the lift distribution on a wing in propulsive jets

Based on comparison with results from special experiments, an evaluation has been performed of the method of Levinsky, Thommen, Yager and Holland, which is intended to calcxilate the spanwise lift distribution on wings immersed in propulsive jets. Various modifications of the original method have been investigated. It was found that the method,...

Experimental investigation of the aerodynamic characteristics of a wing propulsion jets

With the intent to test the qualities of the theoretical models used in two different calculation methods, pressure distributions have been measured on a simple half model wing-in-jet combination. The position of the jets relative to the wing was varied, mainly in a plane perpendicular to the span. Jet velocities of 1, 2 and 3 times the tunnel...