The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Hao Guo - One of the best experts on this subject based on the ideXlab platform.
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Performance of Contra-Rotating Propellers for Stratospheric Airships
International Journal of Aeronautical and Space Sciences, 2015Co-Authors: Zhihao Tang, Peiqing Liu, Jingwei Sun, Yaxi Chen, Hao GuoAbstract:Small advance ratio and low Reynolds number of stratospheric propulsion system bring lots of challenges to the design of Propellers. Contra-rotating propeller configuration is proposed to improve the propulsion efficiency. In this paper, the feasibility of contra-rotating propeller for stratospheric airship has been assessed and its performance has been investigated by wind tunnel tests. The experimental results indicate, at relatively low Reynolds number, although the advance ratio is fixed, the performance of Propellers is different with variation of Reynolds number. Moreover, at the same Reynolds number, the efficiency of contra-rotating propeller achieved appears to be a few percent greater than that for a standard conventional propulsion system. It can be concluded that contra-rotating Propellers would be an efficient means to improve the performance of stratospheric airship propulsion system.
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Experimental Feasibility Assessment of Counter-Rotating Propellers for Stratospheric Airships
53rd AIAA Aerospace Sciences Meeting, 2015Co-Authors: Peiqing Liu, Zhihao Tang, Yaxi Chen, Hao GuoAbstract:A series of systematic wind tunnel tests of a given stratospheric airship counter-rotating propeller have been conducted in this paper. The basic aerodynamic performance of the stratospheric airship counter-rotating propeller has been explored. In addition, different from conventional Propellers, the effect of low Reynolds number has been illustrated. Compared with single-rotating Propellers, the interference between front and rear propeller has also been discussed. The experimental results indicate that low Reynolds number would strongly reduce the efficiency of counter-rotating Propellers. Due to the interference between a pair of Propellers, the performance of front propeller gets slightly worse, whereas the performance of rear propeller turns much better. A significant improvement of efficiency of overall CRP would be gained. By comparison with other configuration of propeller propulsion system, it indicates the counter-rotating propeller would be a wise option applied on stratospheric airships.
Peiqing Liu - One of the best experts on this subject based on the ideXlab platform.
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Performance of Contra-Rotating Propellers for Stratospheric Airships
International Journal of Aeronautical and Space Sciences, 2015Co-Authors: Zhihao Tang, Peiqing Liu, Jingwei Sun, Yaxi Chen, Hao GuoAbstract:Small advance ratio and low Reynolds number of stratospheric propulsion system bring lots of challenges to the design of Propellers. Contra-rotating propeller configuration is proposed to improve the propulsion efficiency. In this paper, the feasibility of contra-rotating propeller for stratospheric airship has been assessed and its performance has been investigated by wind tunnel tests. The experimental results indicate, at relatively low Reynolds number, although the advance ratio is fixed, the performance of Propellers is different with variation of Reynolds number. Moreover, at the same Reynolds number, the efficiency of contra-rotating propeller achieved appears to be a few percent greater than that for a standard conventional propulsion system. It can be concluded that contra-rotating Propellers would be an efficient means to improve the performance of stratospheric airship propulsion system.
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Experimental Feasibility Assessment of Counter-Rotating Propellers for Stratospheric Airships
53rd AIAA Aerospace Sciences Meeting, 2015Co-Authors: Peiqing Liu, Zhihao Tang, Yaxi Chen, Hao GuoAbstract:A series of systematic wind tunnel tests of a given stratospheric airship counter-rotating propeller have been conducted in this paper. The basic aerodynamic performance of the stratospheric airship counter-rotating propeller has been explored. In addition, different from conventional Propellers, the effect of low Reynolds number has been illustrated. Compared with single-rotating Propellers, the interference between front and rear propeller has also been discussed. The experimental results indicate that low Reynolds number would strongly reduce the efficiency of counter-rotating Propellers. Due to the interference between a pair of Propellers, the performance of front propeller gets slightly worse, whereas the performance of rear propeller turns much better. A significant improvement of efficiency of overall CRP would be gained. By comparison with other configuration of propeller propulsion system, it indicates the counter-rotating propeller would be a wise option applied on stratospheric airships.
Zhihao Tang - One of the best experts on this subject based on the ideXlab platform.
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Performance of Contra-Rotating Propellers for Stratospheric Airships
International Journal of Aeronautical and Space Sciences, 2015Co-Authors: Zhihao Tang, Peiqing Liu, Jingwei Sun, Yaxi Chen, Hao GuoAbstract:Small advance ratio and low Reynolds number of stratospheric propulsion system bring lots of challenges to the design of Propellers. Contra-rotating propeller configuration is proposed to improve the propulsion efficiency. In this paper, the feasibility of contra-rotating propeller for stratospheric airship has been assessed and its performance has been investigated by wind tunnel tests. The experimental results indicate, at relatively low Reynolds number, although the advance ratio is fixed, the performance of Propellers is different with variation of Reynolds number. Moreover, at the same Reynolds number, the efficiency of contra-rotating propeller achieved appears to be a few percent greater than that for a standard conventional propulsion system. It can be concluded that contra-rotating Propellers would be an efficient means to improve the performance of stratospheric airship propulsion system.
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Experimental Feasibility Assessment of Counter-Rotating Propellers for Stratospheric Airships
53rd AIAA Aerospace Sciences Meeting, 2015Co-Authors: Peiqing Liu, Zhihao Tang, Yaxi Chen, Hao GuoAbstract:A series of systematic wind tunnel tests of a given stratospheric airship counter-rotating propeller have been conducted in this paper. The basic aerodynamic performance of the stratospheric airship counter-rotating propeller has been explored. In addition, different from conventional Propellers, the effect of low Reynolds number has been illustrated. Compared with single-rotating Propellers, the interference between front and rear propeller has also been discussed. The experimental results indicate that low Reynolds number would strongly reduce the efficiency of counter-rotating Propellers. Due to the interference between a pair of Propellers, the performance of front propeller gets slightly worse, whereas the performance of rear propeller turns much better. A significant improvement of efficiency of overall CRP would be gained. By comparison with other configuration of propeller propulsion system, it indicates the counter-rotating propeller would be a wise option applied on stratospheric airships.
Yaxi Chen - One of the best experts on this subject based on the ideXlab platform.
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Performance of Contra-Rotating Propellers for Stratospheric Airships
International Journal of Aeronautical and Space Sciences, 2015Co-Authors: Zhihao Tang, Peiqing Liu, Jingwei Sun, Yaxi Chen, Hao GuoAbstract:Small advance ratio and low Reynolds number of stratospheric propulsion system bring lots of challenges to the design of Propellers. Contra-rotating propeller configuration is proposed to improve the propulsion efficiency. In this paper, the feasibility of contra-rotating propeller for stratospheric airship has been assessed and its performance has been investigated by wind tunnel tests. The experimental results indicate, at relatively low Reynolds number, although the advance ratio is fixed, the performance of Propellers is different with variation of Reynolds number. Moreover, at the same Reynolds number, the efficiency of contra-rotating propeller achieved appears to be a few percent greater than that for a standard conventional propulsion system. It can be concluded that contra-rotating Propellers would be an efficient means to improve the performance of stratospheric airship propulsion system.
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Experimental Feasibility Assessment of Counter-Rotating Propellers for Stratospheric Airships
53rd AIAA Aerospace Sciences Meeting, 2015Co-Authors: Peiqing Liu, Zhihao Tang, Yaxi Chen, Hao GuoAbstract:A series of systematic wind tunnel tests of a given stratospheric airship counter-rotating propeller have been conducted in this paper. The basic aerodynamic performance of the stratospheric airship counter-rotating propeller has been explored. In addition, different from conventional Propellers, the effect of low Reynolds number has been illustrated. Compared with single-rotating Propellers, the interference between front and rear propeller has also been discussed. The experimental results indicate that low Reynolds number would strongly reduce the efficiency of counter-rotating Propellers. Due to the interference between a pair of Propellers, the performance of front propeller gets slightly worse, whereas the performance of rear propeller turns much better. A significant improvement of efficiency of overall CRP would be gained. By comparison with other configuration of propeller propulsion system, it indicates the counter-rotating propeller would be a wise option applied on stratospheric airships.
Luca Scalinci - One of the best experts on this subject based on the ideXlab platform.
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Numerical investigation of the performance of Contra-Rotating Propellers for a Remotely Piloted Aerial Vehicle
Energy Procedia, 2017Co-Authors: Maria Grazia De Giorgi, Donato Fontanarosa, Anna Eva Morabito, Teresa Donateo, Antonio Ficarella, Luca ScalinciAbstract:The present work aims at the numerical prediction of the performance of a Contra-Rotating Propellers (CRP) system for a Remotely Piloted Aerial Vehicles (RPAV). The CRP system was compared with an equivalent counter-rotating Propellers configuration which was set by considering two eccentric Propellers which were rotating at the same speed. Each contra-rotating test case was built by varying the pitch angle of blades of the rear propeller, while the front propeller preserved the original reconstructed geometry. Several pitch configurations and angular velocities of the rear propeller was simulated. Comparisons showed an improvement of the propulsive efficiency of the contra-rotating configuration in case of larger pitch angles combined with slower angular velocities of the rear propeller.
