Numerical Investigation of a Two-Bladed Propeller Inflow at Yaw

Higgins, Ross J.; Zarev, Angel; Barakos, George N.; Green, Richard B.

doi:10.2514/1.c035647

Cited by 17 publications

(14 citation statements)

References 16 publications

(19 reference statements)

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“…An azimuthal shift of about 45 • following the blade rotation (counter-clockwise) can be observed for both induction factors. Similar phenomena are reported in the study [29] of un-ducted propellers at yaw. The maximum axial induction is seen near the blade tip between 0 • and 90 • azimuth, while the minimum is near the root between 180 • and 270 • .…”

Section: Ducted Propeller Performance At Cross-wind Conditionssupporting

confidence: 88%

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Development of Simulation Tools for High Fidelity Analysis of Compound Rotorcraft

Zhang

Barakos

2020

AIAA Scitech 2020 Forum

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This paper presents the development and validation of a tool chain for high-fidelity analysis of compound rotorcraft. An automatic geometry composition and grid generation framework is constructed using ICEM Hexa scripts and in-house codes. Simulation methods of various fidelity levels are then put forward and evaluated. The framework is examined and validated through simulations of ducted propeller cases. The high fidelity CFD simulations are performed using the HMB3 solver. Comparisons and validation are made with experimental data, as well as simpler predictive methods. The ducted propeller shows superior performance over its un-ducted counterpart at low or moderate advance ratios. The ducted propeller also shows less intrusive wake features. The major thrust gain is identified to originate from the duct itself. As the advance ratio increases, the duct thrust contribution becomes negative and the ducted propeller thus becomes deficient. Cross-wind conditions are also considered. The duct is found to be the source of the large lift force and the nose-up pitching moment. Detailed analyses of the duct surface pressure and the propeller induction are presented.

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Section: Ducted Propeller Performance At Cross-wind Conditionssupporting

confidence: 88%

“…Comparing to the open propeller study [29], the maximum values move further outboard towards the blade tip and the inner duct surface. Further, a concentric pattern can be noticed in Figure 25(a) for the axial induction, indicating a more azimuthally even distribution of the axial induced velocity.…”

Section: Ducted Propeller Performance At Cross-wind Conditionsmentioning

confidence: 66%

Development of Simulation Tools for High Fidelity Analysis of Compound Rotorcraft

Zhang

Barakos

2020

AIAA Scitech 2020 Forum

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“…Previous investigations using HMB3 have provided propeller flow validation in both installed and isolated conditions, by comparison with the experimental results of the Joint Open Rotor Propeller (JORP) blade [9], the Improving the Propulsion Aerodynamic and aCoustics of Turboprop Aircraft (IMPACTA) wind tunnel tests [10,11] and the model aircraft propeller inflow investigation at the University of Glasgow. Good agreement in terms of aerodynamics, acoustics and aeroelasticity were seen by all [12][13][14][15]. In addition to propeller flows, HMB3 has also been validated for tiltrotors, including the AW609 and XV-15 [16], for hover and forward flight.…”

Section: Hmb3mentioning

confidence: 88%

An Aeroacoustic Investigation of a Tiltwing eVTOL Concept Aircraft

Higgins

Barakos

Shahpar

et al. 2020

Aiaa Aviation 2020 Forum

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“…Comparing the results of these methods with the experimentally obtained data demonstrates that they fail to correctly predict the inflow distribution over the propeller plane. For perspective, the maximum discrepancy exhibited when comparing a case from the experimental study with CFD data was over an order of magnitude smaller [27]. As propeller inflow is tied to thrust generation this puts in question the ability of said methods to determine forces over the propeller plane itself.…”

Section: Discussionmentioning

confidence: 99%

“…While higher-order solvers do exist (e.g [26]), they will be omitted in this paper due to their computational expense and because the experimental result set has already been compared in detail against CFD [27].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the effect of yaw angle on the inflow of a two-bladed propeller

Zarev

Green

2020

Aerospace Science and Technology

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An experimental investigation has been performed to measure the inflow of a two-bladed propeller. This is conducted over a range of advance ratios (J = 0.36 to 1.54) and yaw angles (γ = 0 to 20 • ) at a Reynolds number of Re ≈ 111000, based on the chord length and advancing blade resultant velocity at the 70% spanwise position.Drawing on experimental results, three major qualitative trends are observed, that characterise the axial induced inflow of inclined propellers: the formation of an approximately sinusoidal inflow trend around the azimuth featuring broad regions of increased and reduced inflow, an azimuthal phase shift of the trend from the advancing and retreating blade positions, and the dependencies of the inflow maxima, minima and phase shift on advance ratio, yaw angle and radial position. These are subsequently compared against two widely used assumptions for calculating the aerodynamic environment of inclined propellers; firstly, that inflow at each radial and azimuthal element is calculated using an axial approximation of the whole propeller disc operating within the same condition as that element, and secondly, uniform induced inflow across the entire propeller plane. The comparison demonstrates the limitations of said assumptions by highlighting their inability to account for components of the trailed and shed vortical systems of the propeller wake.

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Numerical Investigation of a Two-Bladed Propeller Inflow at Yaw

Cited by 17 publications

References 16 publications

Development of Simulation Tools for High Fidelity Analysis of Compound Rotorcraft

Development of Simulation Tools for High Fidelity Analysis of Compound Rotorcraft

An Aeroacoustic Investigation of a Tiltwing eVTOL Concept Aircraft

Experimental investigation of the effect of yaw angle on the inflow of a two-bladed propeller

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