Investigations of XV-15 Rotor Hover Performance and Flow Field Using U<sup>2</sup>NCLE and HELIOS Codes

Sheng, Chunhua; Zhao, Qiuying; Hill, Matthew

doi:10.2514/6.2016-0303

Cited by 15 publications

(7 citation statements)

References 17 publications

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“…From a point of view of the turbulence model employed, it seems that the fully turbulent flow assumption is able to capture the trend of FoM and torque coefficient (Figure 24 (b)). Similar conclusions were drawn in previous work by Kaul et al [23], Yoon et al [26], and Sheng et al [27], where fully turbulent flows were successfully employed. Comparison between predicted and measured [13] FoM at a collective pitch angle of…”

Section: Helicopter Modesupporting

confidence: 79%

“…However, minimal differences between these fully-turbulent models were observed in the predictions of skin friction coefficient, which did not reproduce well the flowfield encountered in the experiment [13]. Sheng et al [27] used the U 2 NCLE and HELIOS CFD solvers to assess the effect of transition models in predicting the hover figure of merit on the XV-15 blade. Despite the use of a massive grid of 294 million cells for the whole rotor, results at 10 • collective showed an over-predicted FoM with a discrepancy of more than 3%.…”

Section: Model-scale Rotor With Swept-tapered Tip Using the Hpcmp Crementioning

confidence: 99%

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Accurate Predictions of Rotor Hover Performance at Low and High Disc Loadings

García

Barakos

2018

Journal of Aircraft

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This paper presents evidence on the ability of modern CFD methods to accurately predict hover performance of rotors with modest computer resources. The paper uses two well-studied blades, the S-76 main rotor blade and the XV-15 tiltrotor blade. The results are compared with experiments and show that the performance is well predicted. In addition, the employed Computational Fluid Dynamics method was able to capture the effects of the tip Mach number, tip shape, blade aeroelasticity, and flow transition on the performance of the blade as well as on the wake structure and the rotor acoustics.

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Section: Helicopter Modesupporting

confidence: 79%

Section: Model-scale Rotor With Swept-tapered Tip Using the Hpcmp Crementioning

confidence: 99%

Accurate Predictions of Rotor Hover Performance at Low and High Disc Loadings

García

Barakos

2018

Journal of Aircraft

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show abstract

“…Similar conclusions were drawn in previous works by Kaul et al [13], Yoon et al [16], and Sheng et al [17], where fully turbulent flows were successfully employed. …”

Section: Mesh Convergencesupporting

confidence: 79%

“…However, minimal differences between these fully-turbulent models were observed in the predictions of skin friction coefficient, which did not reproduce well the flowfield encountered in the experiment [12]. Sheng et al [17] used the U 2 NCLE and Helios CFD solvers to assess the effect of transition models in predicting the hover figure of merit on the XV-15 blade. Despite the use of a grid size of 294 million cells for the whole rotor, results at 10 • collective showed an over-predicted FoM with a discrepancy of 3.17%.…”

Section: Accurate Predictions Of Hovering Rotor Flows Using Cfdmentioning

confidence: 99%

Accurate predictions of hovering rotor flows using CFD

García¹,

Colonia²,

Barakos³

2017

55th AIAA Aerospace Sciences Meeting

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With work on the S-76 rotor providing encouraging results regarding the prediction of integral loads with CFD in hover, the XV-15 rotor is now analysed. Fully turbulent and transitional results are obtained showing the capability of modern CFD methods. The transition onset and distribution of skin friction are well predicted and were found to have a mild effect on the overall figure of merit. This work also shows the potential of transport-based models for transition prediction in complex 3D flows.

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“…However, minimal differences between these fully-turbulent models were observed in the predictions of skin friction coefficient, which did not reproduce well the flowfield encountered in the experiment (20) . Sheng et al (27) used the U 2 NCLE and Helios CFD solvers, to assess the effect of transition models in predicting the hover figure of merit on the XV-15 blade. Despite the use of a massive grid size of 294 million cells for the whole rotor, results at 10° collective showed an over-predicted FoM with a discrepancy of 3.17%.…”

Section: Introductionmentioning

confidence: 99%

Tiltrotor CFD Part I - validation

2017

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This paper presents performance analyses of the model-scale ERICA and TILTAERO tiltrotors and of the full-scale XV-15 rotor with high-fidelity computational fluids dynamics. For the ERICA tiltrotor, the overall effect of the blades on the fuselage was well captured, as demonstrated by analysing surface pressure measurements. However, there was no available experimental data for the blade aerodynamic loads. A comparison of computed rotor loads with experiments was instead possible for the XV-15 rotor, where CFD results predicted the FoM within 1.05%. The method was also able to capture the differences in performance between hover and propeller modes. Good agreement was also found for the TILTAERO loads. The overall agreement with the experimental data and theory for the considered cases demonstrates the capability of the present CFD method to accurately predict tiltrotor flows. In a second part of this work, the validated method is used for blade shape optimisation.

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Investigations of XV-15 Rotor Hover Performance and Flow Field Using U²NCLE and HELIOS Codes

Cited by 15 publications

References 17 publications

Accurate Predictions of Rotor Hover Performance at Low and High Disc Loadings

Accurate Predictions of Rotor Hover Performance at Low and High Disc Loadings

Accurate predictions of hovering rotor flows using CFD

Tiltrotor CFD Part I - validation

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Investigations of XV-15 Rotor Hover Performance and Flow Field Using U2NCLE and HELIOS Codes

Cited by 15 publications

References 17 publications

Accurate Predictions of Rotor Hover Performance at Low and High Disc Loadings

Accurate Predictions of Rotor Hover Performance at Low and High Disc Loadings

Accurate predictions of hovering rotor flows using CFD

Tiltrotor CFD Part I - validation

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Investigations of XV-15 Rotor Hover Performance and Flow Field Using U²NCLE and HELIOS Codes