Advances in Aerodynamics最新文献

Multiscale simulation of rarefied gas dynamics via direct intermittent GSIS-DSMC coupling 通过 GSIS-DSMC 直接间歇耦合对稀薄气体动力学进行多尺度模拟

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2024-09-10 DOI: 10.1186/s42774-024-00188-y

Liyan Luo, Lei Wu

引用次数: 0

On the effects of non-zero yaw on leading-edge tubercled wings 关于非零偏航对前缘块状翼的影响

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2024-09-05 DOI: 10.1186/s42774-024-00182-4

T. H. New, S. Mandrà

{"title":"On the effects of non-zero yaw on leading-edge tubercled wings","authors":"T. H. New, S. Mandrà","doi":"10.1186/s42774-024-00182-4","DOIUrl":"https://doi.org/10.1186/s42774-024-00182-4","url":null,"abstract":"Steady-state numerical simulations were conducted to capture the aerodynamic characteristics and flow patterns resulting from a tubercled and non-tubercled wing subjected to various combined pitch and yaw conditions at $$Re=1.8 times 10^{5}$$ . Pitch angle ranged from $$0^{circ }$$ to $$25^{circ }$$ , while two different yaw angles of $$10^{circ }$$ and $$30^{circ }$$ were used. Results show that $$10^{circ }$$ yaw angle does not impact upon the lift and drag characteristics significantly, while a $$30^{circ }$$ yaw angle leads to substantial lift and drag losses. Additionally, the tubercled wing continues to confer favourable stall-mitigating characteristics even for the larger yaw angle. Finally, despite skewing the flow structures significantly, the $$30^{circ }$$ yaw angle also reduces the formations of bi-periodic flow structures, flow separations and recirculating regions along the leading-edge tubercles, suggesting potentially better flow stability and controllability. • Steady-state numerical study is conducted on NACA 634021 baseline and tubercled wings • Two yaw angles of $$10^{circ }$$ and $$30^{circ }$$ are used together with pitch angles from $$0^{circ }$$ to $$25^{circ }$$ • Results show $$10^{circ }$$ yaw angle has minimal impact on the lift and drag characteristics, while $$30^{circ }$$ yaw angle reduces both lift and drag levels significantly • Larger yaw angle leads to more skewed flows, as well as reduced flow separations and recirculating regions • Larger yaw angle also suppresses bi-periodic flow behaviour in tubercled wings, suggesting better flow stability and controllability","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":"42 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wind-resistant design theory and safety guarantee for large oil and gas storage tanks in coastal areas 沿海地区大型油气储罐的抗风设计理论与安全保障

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2024-08-27 DOI: 10.1186/s42774-024-00184-2

Bin Huang, Xijie Liu, Zhengnong Li, Dabo Xin, Jinke Liu, Shujie Qin, Tianyin Xiao, Jinshuang Dong

{"title":"Wind-resistant design theory and safety guarantee for large oil and gas storage tanks in coastal areas","authors":"Bin Huang, Xijie Liu, Zhengnong Li, Dabo Xin, Jinke Liu, Shujie Qin, Tianyin Xiao, Jinshuang Dong","doi":"10.1186/s42774-024-00184-2","DOIUrl":"https://doi.org/10.1186/s42774-024-00184-2","url":null,"abstract":"Large oil and gas storage tanks serve as crucial industrial energy infrastructures, which are usually thin-walled steel structures with large volumes and light weights, and they are sensitive to wind loads. Under the influence of strong winds or typhoons, large oil and gas storage tanks may suffer wind-induced damage, resulting in the leakage of gas or liquid inside the tanks, posing hazards to the ecological environment and public safety. Therefore, it is of great theoretical and engineering significance to research the wind resistance of large oil and gas storage tanks. This paper provides a comprehensive review of key issues in wind resistance for large oil and gas storage tanks, including characteristics of flow around circular cylinders, wind effects on structures with circular cross-sections, near-surface wind field characteristics, wind effects on large oil and gas storage tanks, wind-induced interference effects, structural dynamic characteristics, wind loads and wind-induced response calculations, multiple load effects, and wind-induced vibration control. The deficiencies of current research are summarized. The prospects for research on the design theory and safety assurance of large oil and gas storage tanks are presented through various methods, including field measurements of near-surface wind fields and wind effects, wind tunnel tests utilizing aeroelastic models, numerical simulations involving fluid–solid coupling, theoretical analysis, and machine learning.","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":"27 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142185990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Open-jet facility for bio-inspired micro-air-vehicle flight experiment at low speed and high turbulence intensity 用于生物启发微型空气飞行器低速高湍流强度飞行实验的开放式喷气设施

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2024-08-02 DOI: 10.1186/s42774-024-00180-6

Zhifeng Liu, Yue Yang

{"title":"Open-jet facility for bio-inspired micro-air-vehicle flight experiment at low speed and high turbulence intensity","authors":"Zhifeng Liu, Yue Yang","doi":"10.1186/s42774-024-00180-6","DOIUrl":"https://doi.org/10.1186/s42774-024-00180-6","url":null,"abstract":"Bio-inspired micro-air-vehicles (MAVs) usually operate in the atmospheric boundary layer at a low Reynolds number and complex wind conditions including large-scale turbulence, strong shear, and gusts. We develop an open jet facility (OJF) to meet the requirements of MAV flight experiments at very low speed and high turbulence intensity. Powered by a stage-driven fan, the OJF is capable of generating wind speeds covering 0.1 – 16.8 m/s, with a velocity ratio of 100:1. The contraction section of the OJF is designed using an adjoint-driven optimization method, resulting in a contraction ratio of 3:1 and a length-to-diameter ratio of 0.75. A modularized design of the jet nozzle can produce laminar or high-turbulence wind conditions. Flow field calibration results demonstrate that the OJF is capable of producing a high-quality baseline flow with steady airspeed as low as 0.1 m/s, uniform region around 80% of the cross-sectional test area, and turbulence intensity around 0.5%. Equipped with an optimized active grid (AG), the OJF can reproduce controllable, fully-developed turbulent wind conditions with the turbulence intensity up to 24%, energy spectrum satisfying the five-thirds power law, and the uniform region close to 70% of the cross-sectional area of the test section. The turbulence intensity, integral length scale, Kolmogorov length scale, and mean energy dissipation rate of the generated flow can be adjusted by varying the area of the triangular through-hole in the wings of the AG.","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":"103 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141886271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulation and analysis of a ducted-fan drone hovering in confined environments 在密闭环境中悬停的风扇式无人机的数值模拟与分析

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2024-07-26 DOI: 10.1186/s42774-024-00179-z

Yiwei Luo, Yuhang He, Bin Xu, Tianfu Ai, Yuping Qian, Yangjun Zhang

{"title":"Numerical simulation and analysis of a ducted-fan drone hovering in confined environments","authors":"Yiwei Luo, Yuhang He, Bin Xu, Tianfu Ai, Yuping Qian, Yangjun Zhang","doi":"10.1186/s42774-024-00179-z","DOIUrl":"https://doi.org/10.1186/s42774-024-00179-z","url":null,"abstract":"Ducted-fan drones are expected to become the main drone configuration in the future due to their high efficiency and minimal noise. When drones operate in confined spaces, significant proximity effects may interfere with the aerodynamic performance and pose challenges to flight safety. This study utilizes computational fluid dynamics simulation with the Unsteady Reynolds-averaged Navier–Stokes (URANS) method to estimate the proximity effects. Through experimental validation, our computational results show that the influence range of proximity effects lies within four rotor radii. The ground effect and the ceiling effect mainly affect thrust properties, while the wall effect mainly affects the lateral force and the pitching moment. In ground effect, the rotor thrust increases exponentially by up to 26% with ground distance compared with that in open space. Minimum duct thrust and total thrust are observed at one rotor radius above the ground. In ceiling effect, all the thrusts rise as the drone approaches the ceiling, and total thrust increases by up to 19%. In wall effect, all the thrusts stay constant. The pitching moment and lateral force rise exponentially with the wall distance. Changes in blade angle of attack and duct pressure distributions can account for the performance change. The results are of great importance to the path planning and flight controller design of ducted-fan drones for safe and efficient operations in confined environments.","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":"57 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141778342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of tip clearance on non-synchronous propagating flow disturbances of compressor rotors under high aerodynamic loading conditions 在高空气动力负荷条件下，叶尖间隙对压缩机转子非同步传播流动扰动的影响

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2024-07-04 DOI: 10.1186/s42774-024-00178-0

Songbai Wang, Yong Chen, Yadong Wu

{"title":"Effect of tip clearance on non-synchronous propagating flow disturbances of compressor rotors under high aerodynamic loading conditions","authors":"Songbai Wang, Yong Chen, Yadong Wu","doi":"10.1186/s42774-024-00178-0","DOIUrl":"https://doi.org/10.1186/s42774-024-00178-0","url":null,"abstract":"The complex tip flow instability and its induced non-synchronous vibration have become significant challenges, especially as aerodynamic loading continues to increase. This study investigates the effects of tip clearance on non-synchronous propagating flow disturbances of compressor rotors under high aerodynamic loading conditions by conducting full-annulus unsteady numerical simulations with three typical tip clearance values for a 1-1/2 stage transonic compressor. The non-synchronous aerodynamic excitation frequency, circumferential mode characteristics, and annular unstable flow structures are analyzed under near stall conditions. The results show that the total pressure ratio and normalized mass flow parameters first increase and then decrease as the tip clearance increases from 0.5%C (where C represents the tip chord length) to 2%C under high aerodynamic loading conditions, instead of constantly decreasing. For the 0.5%C tip clearance case, the traveling large-scale tornado-like separation vortices cause a low non-synchronous aerodynamic excitation frequency and severe pressure fluctuations. The periodic shedding and reattachment processes of the rotor blades separated by 2 – 3 pitches result in 19 dominant mode orders in the circumferential direction. As the tip clearance increases from 1%C to 2%C, the difference of tip flow structures in each blade passage is significantly weakened, and the dominant mode order of the disturbance is equal to the rotor blade-passing number. The pressure fluctuation is mainly caused by cross-channel tip leakage flow, and the aerodynamic excitation frequency exhibits evident broadband hump characteristics, which has been reported as a rotating instability phenomenon.","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":"39 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141546843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Direct numerical simulation of supersonic boundary layer transition induced by gap-type roughness 间隙型粗糙度诱发超音速边界层过渡的直接数值模拟

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2024-07-02 DOI: 10.1186/s42774-024-00177-1

Hongkang Liu, Kehui Peng, Yatian Zhao, Qian Yu, Zhiqiang Kong, Jianqiang Chen

{"title":"Direct numerical simulation of supersonic boundary layer transition induced by gap-type roughness","authors":"Hongkang Liu, Kehui Peng, Yatian Zhao, Qian Yu, Zhiqiang Kong, Jianqiang Chen","doi":"10.1186/s42774-024-00177-1","DOIUrl":"https://doi.org/10.1186/s42774-024-00177-1","url":null,"abstract":"The transition of the supersonic boundary layer induced by roughness is a highly intricate process. Gaining a profound understanding of the transition phenomena and mechanisms is crucial for accurate prediction and control. In this study, to delve into the flow mechanisms of a transition in a supersonic boundary layer induced by the medium gap-type roughness, direct numerical simulation is employed to capture and analyze the transition process. Research indicates that as the flow over the flat plate passes the gap, the spanwise convergence effect leads to the formation of both upper and lower counter-rotating vortex pairs. As the flow progresses, these counter-rotating vortex pairs in the central region exhibit attenuation, with streamwise vortices developing on both sides. At a certain downstream distance, the boundary layer becomes unstable, triggering the formation of streamwise vortex legs. These streamwise vortex legs undergo further evolution, transforming into hairpin vortices and leg-buffer vortices. The formation of the central low-speed zone downstream of the roughness element is mainly attributed to the lift-up effect of the low-speed flow propelled by the central counter-rotating vortex pairs. The low-speed streaks on both sides are primarily influenced by the streamwise vortices. Through a meticulous analysis of the turbulent kinetic energy distribution and its generation mechanisms during the transition phase, this study infers that the primary sources of turbulent kinetic energy are the hairpin vortices, leg-buffer vortices, and their consequent secondary vortices. Combined with modal analysis, the study further elucidates the generation and breakdown of hairpin and leg-buffer vortices.","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":"21 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141512097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical study on the thermodynamic behavior of de-icing liquid droplets impacting walls 除冰液滴撞击墙壁的热力学行为数值研究

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2024-06-01 DOI: 10.1186/s42774-024-00176-2

Jing Cui, Shuxin Niu, Guangfeng Yang

{"title":"Numerical study on the thermodynamic behavior of de-icing liquid droplets impacting walls","authors":"Jing Cui, Shuxin Niu, Guangfeng Yang","doi":"10.1186/s42774-024-00176-2","DOIUrl":"https://doi.org/10.1186/s42774-024-00176-2","url":null,"abstract":"Spraying de-icing fluid is a key method to ensure the safe operation of aircraft in icy and snowy weather. The film aggregation and internal mixing of de-icing fluid droplets on the aircraft skin during a collision are crucial. Considering the rheological properties of the molecular viscosity change of the de-icing fluid droplets during the collision and the heat transfer model of the heat loss after the impact, the phase field method is used to capture the gas–liquid interface, and a thermal pressure/viscous coupling model is constructed. The thermodynamic behavior of different axial distances is calculated. The results show that, as the dimensionless axial distance of the droplet increases, the spreading length of the fused droplet decreases instead, and the heat transfer rate of the droplet increases with the increase in spreading length. After stabilizing, the increase or decrease in the heat transfer rate depends on the strength of the heat transfer between the liquid layers. As the dimensionless axial distance increases, the internal flow of the droplet weakens and, between the droplet and the wall, the heat flux density gradually decreases and the average temperature drop of the droplet becomes gradual.","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":"6 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141192029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Full Non-linear Vortex Tube-Vorton Method: the pre-stall condition 全非线性涡管-涡顿法：预滞留条件

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2024-04-18 DOI: 10.1186/s42774-023-00168-8

Jesus Carlos Pimentel-Garcia

引用次数: 0

A modified local thermal non-equilibrium model of transient phase-change transpiration cooling for hypersonic thermal protection 用于高超音速热防护的瞬态相变蒸腾冷却局部热非平衡态修正模型

IF 2.3 3区工程技术

Advances in Aerodynamics Pub Date : 2024-04-12 DOI: 10.1186/s42774-024-00173-5

Kaiyan Jin, Jin Zhao, Guice Yao, Dongsheng Wen

{"title":"A modified local thermal non-equilibrium model of transient phase-change transpiration cooling for hypersonic thermal protection","authors":"Kaiyan Jin, Jin Zhao, Guice Yao, Dongsheng Wen","doi":"10.1186/s42774-024-00173-5","DOIUrl":"https://doi.org/10.1186/s42774-024-00173-5","url":null,"abstract":"Aiming to efficiently simulate the transient process of transpiration cooling with phase change and reveal the convection mechanism between fluid and porous media particles in a continuum scale, a new two-phase mixture model is developed by incorporating the local thermal non-equilibrium effect. Considering the low-pressure and high overload working conditions of hypersonic flying, the heat and mass transfer induced by capillary and inertial body forces are analyzed for sub-cooled, saturated and super-heated states of water coolant under varying saturation pressures. After the validation of the model, transient simulations for different external factors, including spatially-varied heat flux, coolant mass flux, time-dependent external pressure and aircraft acceleration are conducted. The results show that the vapor blockage patterns at the outlet are highly dependent on the injection mass flux value and the external pressure, and the reduced saturation temperature at low external pressure leads to early boiling off and vapor blockage. The motion of flying has a large influence on the cooling effect, as the inertial force could change the flow pattern of the fluid inside significantly. The comparison of the results from 2-D and 3-D simulations suggests that 3-D simulation shall be conducted for practical application of transpiration cooling, as the thermal protection efficiency may be overestimated by the 2-D results due to the assumption of an infinite width length of the porous plate.","PeriodicalId":33737,"journal":{"name":"Advances in Aerodynamics","volume":"42 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2024-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140576754","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0