A Modified AUSM+-up Scheme for Simulation of Flow Around Rotary Blades

Xu, Junqi; Song, Wenping; Han, Zhonghua; Yang, Xudong

doi:10.2514/6.2014-1429

Cited by 3 publications

(3 citation statements)

References 25 publications

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“…The test and computational fluid dynamics (CFD) simulation results 29 of the full-scale propeller are presented in Figure 22. The comparisons are done at two different altitudes and the same wind speed of 10 m/s.…”

Section: Results Of Experiments and Calculationmentioning

confidence: 99%

Optimal design and experiment of propellers for high altitude airship

Jiao

Song

Zhang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part G:

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The multi-objective optimization design method and experimental validation of the propeller for high altitude airships are presented in this paper. The method of predicting the propeller's aerodynamic characteristics is based on the vortex theory. The non-dominated sorting genetic algorithm II is introduced and applied to solve the optimization problem. Then the optimization model which aims to design an efficient and lightweight propeller for high altitude airships is established based on the conditions of high altitude airships propulsion system. In addition, the effects of various design variables including pitch angle, chord length, diameter, rotational speed, and the number of blades on high altitude propeller performance are presented and discussed in a gradual manner. The optimization results indicate that the desirable tradeoff between the efficiency and weight of high altitude propeller is associated with the absorbed power, structural strength, and even the manufacturing and installation conditions. In order to evaluate the mathematical model and performance of the optimized propeller, wind tunnel experiments of scaled model on the basis of scaling laws and the full-scale propeller test using mobile testing system were carried out. It is shown that results obtained from the experiments agree well with those of the numerical calculation, which verifies that the designed propeller can satisfy the requirements of the high altitude airships' propulsion system.

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Section: Results Of Experiments and Calculationmentioning

confidence: 99%

Optimal design and experiment of propellers for high altitude airship

Jiao

Song

Zhang

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part G:

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show abstract

“…Once the optimized chord length and pitch angle for each cross section of the propeller are configured, the desired propeller is obtained. 11,12 The aerodynamic performances of a propeller such as thrust, torque, and efficiency are calculated by simulating the flow around the propeller based on Reynolds-Averaged Navier-Stokes equations, for more details one can refer to Xu et al 13 Efficiency of the propulsion system is determined by the efficiency of the motor system and propeller.…”

Section: Brief Introduction Of Computation Methods For Aerodynamic Properties Of Propellermentioning

confidence: 99%

Exploring optimum power unit of propulsion system for high altitude airship

Chen

Song

Wang

2014

Proceedings of the Institution of Mechanical Engineers, Part G:

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Different schemes of a propulsion system have a distinguished influence on the overall performance of high altitude airship. There is an optimum power, called optimum power unit, to achieve the lowest propulsion system and energy system weight for a high altitude airship. The paper represents an optimization model of the optimum power unit for a high altitude airship. Firstly, the optimal Latin hypercube design method is applied to obtain the sample points of the distributed low power propulsion system. Secondly, the surrogate model, which is used to establish the optimization model, is obtained by responding surface method based on these sample points. The computational model of the energy system is obtained by the airship's location and the working time. Finally, the multi-island genetic algorithm is used to find the optimum power unit for a typical high altitude airship. Furthermore, the optimization work under different typical power levels and diameters is carried out to verify the effectiveness of the optimum power unit design method. It has been found that the identical result validates the effectiveness of the optimum power unit design method. KeywordsHigh altitude airship, propeller propulsion system, energy system, optimum power unit, surrogate model, multi-island genetic algorithm Date

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“…The RANS method can better simulate the viscous effect, circulation variation, and evolution of wake vortices of flow over a three-dimensional wind turbine blade, and gives more description of flow structure and details [36,37]. In the present work, an in-house code "ROTNS" [38] was used to simulate the quasi-steady flow around wind turbine blades. In this code, the cell-centered finite-volume method developed by Jameson [39] was used to solve the RANS equations on the rotational coordinate system fixed to the blade.…”

Section: Aerodynamic Analysis Models and Validationmentioning

confidence: 99%

Design Optimization of a Multi-Megawatt Wind Turbine Blade with the NPU-MWA Airfoil Family

Han

Yan

et al. 2019

Energies

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A new airfoil family, called NPU-MWA (Northwestern Polytechnical University Multi-megawatt Wind-turbine A-series) airfoils, was designed to improve both aerodynamic and structural performance, with the outboard airfoils being designed at high design lift coefficient and high Reynolds number, and the inboard airfoils being designed as flat-back airfoils. This article aims to design a multi-megawatt wind turbine blade in order to demonstrate the advantages of the NPU-MWA airfoils in improving wind energy capturing and structural weight reduction. The distributions of chord length and twist angle for a 5 MW wind turbine blade are optimized by a Kriging surrogate model-based optimizer, with aerodynamic performance being evaluated by blade element-momentum theory. The Reynolds-averaged Navier-Stokes equations solver was used to validate the improvement in aerodynamic performance. Results show that compared with an existing NREL (National Renewable Energy Laboratory) 5 MW blade, the maximum power coefficient of the optimized NPU 5 MW blade is larger, and the chord lengths at all span-wise sections are dramatically smaller, resulting in a significant structural weight reduction (9%). It is shown that the NPU-MWA airfoils feature excellent aerodynamic and structural performance for the design of multi-megawatt wind turbine blades.Energies 2019, 12, 3330 2 of 24 designed by National Aeronautical Research Institute of Sweden [10]. The Northwestern Polytechnical University (NPU) of China has developed a family of NPU-WA (Northwestern Polytechnical University Wind-turbine A-series) airfoils for megawatt wind turbines, featuring a high lift-to-drag ratio at a high Reynolds number and a high lift coefficient [11][12][13][14]. The Chinese Academy of Sciences (CAS) has designed a family of CAS airfoils for medium Reynolds numbers [15]. The Chongqing University of China and Technical University of Denmark have developed the CQU-DTU-series airfoils, taking into account of the aerodynamic performance and low noise requirements [16]. Compared with the conventional aeronautic airfoils, the dedicated airfoils for wind turbine blades have a higher lift-to-drag ratio, which means that the aerodynamic force of the blades has a larger component in the tangential direction of the wind wheel and lower component in the axial direction (thrust), resulting in smaller thrust with the same tangential component of aerodynamic force, thus the total aerodynamic load is reduced.With the continuous development of wind turbine technology, the wind turbine generator system tends to become larger and larger. The blade diameter of wind turbines has increased from about 20 m in the 1980s to nearly 200 m, or even more now. Meanwhile, the capacity has also been increased, from 20 kW~60 kW to 5 MW~10 MW [17][18][19]. In recent years, the technology for applying the wind turbine-dedicated airfoil family to megawatt wind turbines (1.0 MW, 3.0 MW) has gradually matured. More and more attention has been paid to the development of new airfoil families dedicated t...

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A Modified AUSM+-up Scheme for Simulation of Flow Around Rotary Blades

Cited by 3 publications

References 25 publications

Optimal design and experiment of propellers for high altitude airship

Optimal design and experiment of propellers for high altitude airship

Exploring optimum power unit of propulsion system for high altitude airship

Design Optimization of a Multi-Megawatt Wind Turbine Blade with the NPU-MWA Airfoil Family

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