Article
Engineering, Mechanical
Longfei Cong, Bin Teng, Lifen Chen, Wei Bai, Ruijia Jin, Biaosong Chen
Summary: The excellent aerodynamic performance of birds and bats during flying and propulsion has been studied by adopting a low aspect-ratio wing flapping in uniform flow. A bio-inspired flow controlling strategy based on active wing-chord adjustment has been proposed to achieve aerodynamic enhancement. The effects of stretching pattern and aspect ratio on the aerodynamic performance of the wing have been investigated. The results show that in-phase active controlling delays Leading Edge Vortex (LEV) detachment and enhances Trailing Edge Vortex (TEV), while out-phase wing-chord adjustment leads to flow separation and performance deterioration of the wing. The study also reveals that the aerodynamic performance of the flapping wing is susceptible to the stretching phase of wing-chord.
JOURNAL OF FLUIDS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Reynolds Addo-Akoto, Hyeon-Ho Yang, Jong-Seob Han, Jae-Hung Han
Summary: The study investigates the effect of wing flexibility on aerodynamic characteristics and reveals that flexible wings can generate wider and more uniform downwash, leading to enhanced aerodynamic performance.
JOURNAL OF FLUIDS AND STRUCTURES
(2023)
Article
Engineering, Aerospace
Hao Li, Mostafa R. A. Nabawy
Summary: Increasing stroke amplitude can enhance translational lift for wings with small aspect ratio or large radial centroid location, but can lead to reduced translational lift due to wingtip stall effect beyond a certain threshold. Moreover, the significant reduction in rotational drag as stroke amplitude increases results in an overall increase in aerodynamic efficiency across all aspect ratio and radial centroid location cases.
Article
Engineering, Mechanical
Hamed Khodabakhshian Naeini, Mahdi Nili-Ahmadabadi, Yoon Seong Park, Kyung Chun Kim
Summary: The experimental results demonstrate that the use of nature-inspired needle-shaped vortex generators (VGs) on a double-delta wing significantly improves the flow structure by increasing flow momentum, energizing near-surface flow, creating a more concentrated vortex system, and delaying vortex breakdown.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Aerospace
Mahdi Naderinezhad, M. H. Djavareshkian
Summary: This study investigates the effectiveness of two types of winglets, multi-tip and raked, on the performance of sinusoidal and simple leading-edge wings, and finds that they can improve aerodynamic performance, particularly by increasing lift and reducing induced drag.
AIRCRAFT ENGINEERING AND AEROSPACE TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Ping-Han Chung, Po-Hsiang Chang, Szu- Yeh
Summary: In this study, the aerodynamic effect of an alula-like vortex generator (alula-VG) on a revolving wing was investigated. The results showed that the position of the alula-VG and the angle of attack of the wing model played important roles in the aerodynamic effect.
Article
Engineering, Mechanical
Tao Chen, Xiao Jiang, Haipeng Wang, Qian Li, Mingzhou Li, Zhou Wu
Summary: The study found that the installation angles of the leading-edge slat have a significant impact on the lift coefficient and torque, improving the performance of wind turbine blades.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2021)
Article
Energy & Fuels
Lukasz Malicki, Ziemowit Malecha, Krzysztof Tomczuk
Summary: This paper assesses the influence of a novel vortex creation device called the leading-edge vortex controller (LEVCON) on the aerodynamic characteristics of a fighter jet. By using computational fluid dynamics (CFD) simulations with OpenFOAM 8, the results show that LEVCON can positively manipulate lift and critical angle of attack, achieving higher lift gains and a flatter stall characteristic.
Article
Chemistry, Multidisciplinary
Xuan Bai, Hao Zhan, Baigang Mi
Summary: Based on the bionic design of humpback whale fin, a passive flow control method using wavy leading edge structure was proposed to increase the flapping lift of straight symmetrical flapping wing. CFD numerical simulation was used to compare and analyze the aerodynamic performance and flow field characteristics of straight wing and wavy leading edge flapping wing with different parameters. The simulation results showed that the wavy leading edge structure changed the flow field and increased the lift by reducing the pressure on the upper surface during downward flapping.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Mechanical
Muhammad Bilal Anwar, Aamer Shahzad, Muhammad Nafees Mumtaz Qadri
Summary: This study investigates the impact of tubercles on the aerodynamic performance of flapping wings, finding that tubercles generally degrade lift, drag, and power coefficients. While some tubercle leading-edge wings show slightly lower drag and power coefficient values, none perform better than the baseline wing in terms of aerodynamic efficiency and power economy. Further research is needed to explore the potential benefits of tubercles for hovering insect-like motion.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2021)
Article
Energy & Fuels
Axelle Vire, Geert Lebesque, Mikko Folkersma, Roland Schmehl
Summary: This paper presents steady-state RANS simulations for a leading-edge inflatable (LEI) wing, exploring its aerodynamic performance and local flow characteristics. The results show that side-slip has a negative impact on the wing's aerodynamic performance, while the chordwise struts have little influence.
Article
Engineering, Civil
Yifei Sun, Qingkuan Liu, Kan Liu, Hongmiao Jing, Xing Chang, Linyuan Shao, Yangxue Wang
Summary: Previous studies have found that wavy circular cylinders have lower wind-induced drag than standard circular cylinders in the subcritical regime. However, their aerodynamic performance at higher Reynolds numbers remains unknown. In this study, wind tunnel tests were conducted and the results showed that the aerodynamic characteristics of the wavy cylinder were significantly modified compared to the standard cylinder, and these modifications were highly dependent on the Reynolds number. The wavy cylinder also exhibited three-dimensional aerodynamic characteristics and reduced vortex-induced vibration and dry galloping amplitudes.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2023)
Article
Engineering, Civil
Yan Yan, Eldad Avital, John Williams, Jiahuan Cui
Summary: The study found that leading-edge protuberances can significantly increase VAWT power coefficient at low tip-speed ratios and delay dynamic stall after stall.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2021)
Article
Engineering, Aerospace
Zhijie Zhao, Zhenbing Luo, Xiong Deng, Jianyuan Zhang, Jiefu Liu, Shiqing Li
Summary: This article proposes a novel method of flight control using dual synthetic jets, which is applied to a large-sweep flying wing aircraft. The experimental results demonstrate that the dual synthetic jets can delay the stalling angle, increase the lift coefficient, and improve the flight control capability of the aircraft.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
Zhanzhou Hao, Bo Yin, Prasert Prapamonthon, Guowei Yang
Summary: Through numerical simulation, it is found that the swimming speed of penguins mainly relies on the adjustment of feathers rather than wing flapping. The optimal feathering angle is crucial for achieving the highest swimming efficiency, and the outer three-fifths of the wing contribute 85.4% of thrust generation.
Article
Engineering, Mechanical
Huang Chen, Yuanchao Li, David Tan, Joseph Katz
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
(2017)
Article
Engineering, Mechanical
Huang Chen, Yuanchao Li, Subhra Shankha Koley, Nick Doeller, Joseph Katz
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
(2017)
Article
Engineering, Mechanical
Yuanchao Li, Huang Chen, Joseph Katz
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
(2017)
Article
Engineering, Mechanical
Huang Chen, Yuanchao Li, Joseph Katz
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
(2019)
Article
Engineering, Mechanical
Yuanchao Li, Huang Chen, David Tan, Joseph Katz
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
(2019)
Article
Engineering, Mechanical
Huang Chen, Nick Doeller, Yuanchao Li, Joseph Katz
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2020)
Article
Engineering, Mechanical
Huang Chen, Yuanchao Li, Subhra Shankha Koley, Joseph Katz
Summary: The study focused on the turbulence characteristics in the tip region of an axial turbomachine, revealing that axial casing grooves lead to a more complex flow structure and significant turbulence anisotropy, with notable variations in the distribution of Reynolds stresses.
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Subhra Shankha Koley, Huang Chen, Ayush Saraswat, Joseph Katz
Summary: This experimental study investigates the interactions of axial casing grooves with flow in an axial turbomachine. Different types of grooves have varying effects on machine performance, with U grooves reducing stall flowrate but degrading efficiency, and S grooves improving stall flowrate without efficiency degradation. Stereo-PIV measurements provide insights into the mechanisms involved in these interactions.
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Biomedical
Martin L. Tomov, Lilanni Perez, Liqun Ning, Huang Chen, Bowen Jing, Andrew Mingee, Sahar Ibrahim, Andrea S. Theus, Gabriella Kabboul, Katherine Do, Sai Raviteja Bhamidipati, Jordan Fischbach, Kevin McCoy, Byron A. Zambrano, Jianyi Zhang, Reza Avazmohammadi, Athanasios Mantalaris, Brooks D. Lindsey, David Frakes, Lakshmi Prasad Dasi, Vahid Serpooshan, Holly Bauser-Heaton
Summary: This research uses an in vitro model to simulate vascular anastomosis in pulmonary arteries and aid in surgical planning to reduce vascular restenosis. By utilizing bioprinting technology to reconstruct intervascular connections within bifurcated pulmonary arteries, the study found that vascular geometry and flow hemodynamics significantly affect endothelial cell viability, proliferation, alignment, microcapillary formation, and metabolic profiles.
ADVANCED HEALTHCARE MATERIALS
(2021)
Article
Engineering, Mechanical
Subhra Shankha Koley, Ayush Saraswat, Huang Chen, Joseph Katz
Summary: This study investigates the impact of axial casing groove geometry on turbulent kinetic energy and Reynolds stresses near the rotor tip. Different groove shapes are used to decouple the effects of entraining the tip leakage vortex and causing periodic changes to the incidence angle. The results provide valuable insights for turbulence modeling, highlighting the different mechanisms involved and explaining the observed distribution trends.
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
(2022)
Article
Engineering, Biomedical
Huang Chen, Breandan Yeats, Kevin Swamy, Milad Samaee, Sri Krishna Sivakumar, Fateme Esmailie, Atefeh Razavi, Pradeep Yadav, Vinod H. Thourani, Venkateshwar Polsani, Lakshmi Prasad Dasi
Summary: This method utilizes known device geometry and image registration-based reconstruction method to accurately recover the geometries of stent and leaflet from CT images. It has low geometric error, requires minimal human inputs, and is robust. It enables finite element analysis and reasonable estimation of stress distribution.
ANNALS OF BIOMEDICAL ENGINEERING
(2022)
Article
Engineering, Biomedical
Huang Chen, Lakshmi Prasad Dasi
Summary: The performance of a transcatheter aortic valve (TAV) can be evaluated by analyzing the flow field downstream of the valve using time-resolved 3D particle tracking velocimetry. This experimental study provides a comprehensive 3D measurement of the flow field downstream of an Edwards SAPIEN 3 using the Shake-the-Box algorithm. The results show the importance of considering the flow downstream of the valve to evaluate the risk of leaflet thrombosis.
ANNALS OF BIOMEDICAL ENGINEERING
(2023)
Article
Engineering, Biomedical
Jae Hyun Kim, Vahid Sadri, Huang Chen, Sanchita Bhat, Keshav Kohli, Raj Makkar, Vasilis C. Babaliaros, Rahul P. Sharma, Ajit P. Yoganathan
Summary: The study investigated the influence of patient-specific aortic geometry on the flow dynamics around Transcatheter Aortic Valve (TAV). Through in vitro experiments, it was found that the curvature of the ascending aorta had a positive correlation with the flow circulation and a negative correlation with the particle washout time. This suggests that the distinct vortical flow patterns in the ascending aorta contribute to reducing the risk of flow stagnation and improving washout time.
ANNALS OF BIOMEDICAL ENGINEERING
(2023)
Proceedings Paper
Engineering, Mechanical
Huang Chen, Primoi Dresar, Bryan Lynch, Paarth Sharma, Christopher Williams, Joseph Katz
PROCEEDINGS OF THE ASME/JSME/KSME JOINT FLUIDS ENGINEERING CONFERENCE, 2019, VOL 3B
(2019)
Article
Engineering, Marine
Yuanchao Li, Huang Chen, Joseph Katz
JOURNAL OF SHIP RESEARCH
(2019)