Article
Engineering, Aerospace
Jeongjae Hwang, Seong-kyun Im
Summary: The effects of suction timing and location on the occurrence of inlet unstart were investigated. Boundary-layer suction was found to be effective in preventing or delaying inlet unstart. The best control performance was achieved with suction applied upstream and with faster suction trigger timing. Suction helped to reduce fluctuations in wall pressure. It was also found that suction must be applied before the unstart shockwave passes through the suction location to achieve effective flow control.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Aerospace
Ruiqing Guan, Jinglei Xu, Kaikai Yu, Jie Tian
Summary: Combustion chamber design is crucial for scramjet engine development, with traditional experimental facilities categorized into free-jet and direct-connect types. The former offers real conditions but at a higher cost, while the latter, despite being cost-effective, lacks the ability to replicate real flow fields. An inverse design method has been introduced to mitigate this limitation. The new direct-connect facility successfully reproduced a specific distorted flow field, confirming its reliability and accuracy through various experiments and simulations.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Manoj Kumar K. Devaraj, Prahallada Jutur, Srisha M. Rao, Gopalan Jagadeesh, Ganesh T. K. Anavardham
Summary: Understanding the mechanism of local unstart in a mixed compression scramjet intake is crucial for its stable off-design operation. Experimental and numerical studies were conducted to investigate the local unstart behavior of a hypersonic scramjet intake, revealing the significant impact of internal contraction ratio on local unstart and the driving role of shear layer in self-sustained oscillations during dynamic cowl experiments.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Aerospace
Tristan Vanyai, Stefan Brieschenk, Mathew Bricalli, Tamara Sopek, Timothy J. McIntyre
Summary: Experimental study shows that thermal compression can directly increase combustion-induced pressure rise in a non-uniform scramjet flowpath. Injection of helium in half of the combustor can suppress combustion.
AEROSPACE SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Jianqin Zhu, Runze Tang, Yu Chen, Shuai Yin, Yi Huang, Teckneng Wong
Summary: The liquid crystal-based method is a new technology developed for flow visualizations and measurements at microscale with great potentials. A numerical analysis has been used to study the coupling effect of the LC's director orientation and flow field. Experimental results on two classic shear flow cases show that increasing pressure gradients significantly affect flow field distributions.
Review
Biotechnology & Applied Microbiology
Yingzhi Gu, Yuxing Bai, Xianju Xie
Summary: In dental research, bite force is crucial for evaluating the effectiveness of tooth restoration, periodontal treatment, and orthodontic treatment. Various devices, such as strain gauge transducers and piezoelectric transducers, are used to measure bite force. This allows physicians to objectively assess treatment effects by monitoring dynamic changes in bite force and occlusal contact.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2021)
Article
Chemistry, Analytical
Mariusz R. Rzasa, Beata Czapla-Nielacna
Summary: Vortex flow meters are used to measure the flow of gases and liquids by detecting the frequency of vortices generated in the flowing fluid. The shape of the vortex shedder affects the stability and generation of vortices, leading to the determination of the optimal measurement position and factors influencing vortex frequency through the study of different shedder shapes.
Article
Engineering, Aerospace
Jaewon Lee, Sang Gon Lee, Sang Hun Kang, Hyuck-Joon Namkoung
Summary: In this study, the flow characteristics of non-oscillatory unstarted flow in a scramjet inlet-isolator model are investigated using numerical analysis. It is found that the direction-changing processes within the boundary layers and the recirculation zones near the rear part of the model irregularly influence the non-oscillatory unstarted flow.
Article
Engineering, Marine
Jinzhao Li, Xuan Kong, Yilin Yang, Zhiwen Yang, Jiexuan Hu
Summary: In this study, a non-contact computer vision (CV)-based method is proposed to conveniently acquire wave pressure and force without the need for pressure sensors or load cells. The method uses optical flow technique to measure velocity field and solves the Poisson pressure equation to compute pressure field. The wave force is determined by integrating pressure over the structure surface. The method is verified through laboratory experiments and shows good agreement with results from pressure sensors.
Article
Computer Science, Software Engineering
S. Wolligandt, T. Wilde, C. Roessl, H. Theisel
Summary: The Double Gyre flow model by Shadden et al. is a standard benchmark data set for calculating hyperbolic Lagrangian Coherent Structures in flow data. A new benchmark data set with closed-form hyperbolic trajectories is proposed, allowing for the computation of hyperbolic LCS boundaries by simple particle integration without considering the flow map gradient. This approach serves as ground truth solution for testing existing numerical methods and generates hyperbolic LCS curves significantly longer than current numerical methods.
COMPUTER GRAPHICS FORUM
(2021)
Review
Engineering, Multidisciplinary
Fangbo Li, Haibin Zhang, Bofeng Bai
Summary: Molecular tagging measurement technique uses molecules as tagging and tracking materials, showing advantages in measuring complex flow fields and multiple parameters simultaneously. This review presents recent advances, measurement fundamentals, approaches, factors affecting resolution and uncertainty, as well as applications of the technique. It aims to promote widespread applications in scientific research and industry.
Article
Thermodynamics
Kumari Ambe Verma, Krishna Murari Pandey, Mukul Ray, Kaushal Kumar Sharma
Summary: Supersonic mixing layer behind a hydrogen-fueled wedge-shaped strut was achieved through a combined fuel injection strategy. Numerical investigation showed that a wall transverse fuel injection system along with a parallel fuel injection approach is suitable for stable combustion performance. Experimental observations matched well with the computational results in terms of shock wave incident location and expansion fan behavior.
Article
Engineering, Marine
Md Mahbub Alam
Summary: The paper systematically presents the importance of considering the quiescent-fluid added mass in the estimation of loadcell-measured fluid force on an oscillating cylinder. The study provides a handy analysis of forces and added mass for postgraduate studies, researchers, and engineers.
Article
Immunology
Thomas Liechti, Lukas M. Weber, Thomas M. Ashhurst, Natalie Stanley, Martin Prlic, Sofie Van Gassen, Florian Mair
Summary: High-dimensional cytometry experiments measuring 20-50 cellular markers have become routine, requiring added rigor in experimental planning and data analysis to avoid misinterpretation of results. This article discusses common pitfalls encountered during high-dimensional cytometry data analysis and provides a basic framework and recommendations for reporting and analyzing these datasets.
Article
Thermodynamics
Joao V. M. B. de Siqueira, Mauricio A. P. Rosa, Guilherme B. Ribeiro
Summary: This study evaluates the effects of different air freestream conditions on the flow field in a Scramjet inlet through detailed CFD simulations. The results show that high Mach numbers result in high-pressure levels, higher angle of attack decreases airflow pressure, and higher flight altitude decreases total pressure.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Engineering, Aerospace
Luke J. Doherty, Michael K. Smart, David J. Mee
Article
Engineering, Aerospace
Wilson Y. K. Chan, David J. Mee, Michael K. Smart, James C. Turner
JOURNAL OF PROPULSION AND POWER
(2015)
Article
Engineering, Aerospace
Wilson Y. K. Chan, David J. Mee, Michael K. Smart, James C. Turner
JOURNAL OF PROPULSION AND POWER
(2015)
Article
Engineering, Aerospace
Rainer M. Kirchhartz, David J. Mee, Raymond J. Stalker
Article
Computer Science, Interdisciplinary Applications
W. Y. K. Chan, P. A. Jacobs, D. J. Mee
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2012)
Article
Engineering, Aerospace
Katsuyoshi Tanimizu, David J. Mee, Raymond J. Stalker, Peter A. Jacobs
JOURNAL OF PROPULSION AND POWER
(2011)
Article
Engineering, Mechanical
S. M. Aminossadati, D. J. Mee
JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME
(2013)
Article
Mechanics
Katsuyoshi Tanimizu, David J. Mee, Raymond J. Stalker, Peter A. Jacobs
Article
Engineering, Mechanical
Daniel R. Smith, David E. Gildfind, Timothy J. McIntyre, David J. Mee, Christopher M. James, Andreas Andrianatos
EXPERIMENTS IN FLUIDS
(2019)
Article
Engineering, Mechanical
Daniel R. Smith, David E. Gildfind, David J. Mee, Christopher M. James, Barry Allsop
EXPERIMENTS IN FLUIDS
(2020)
Article
Thermodynamics
Sangkyoung Lee, Grant Yaganegi, David J. Mee, Zhigiang Guan, Hal Gurgenci
Summary: Supercritical CO2 (s-CO2) Brayton power cycles have garnered recent attention for their efficiency, compactness, cost-effectiveness, and eco-friendliness, with the turbine being a critical component. A novel one-dimensional part-load performance prediction model has been introduced to accurately predict the performance of s-CO2 turbines, demonstrating less than 10% deviation and eliminating the need for calibration.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Engineering, Aerospace
Ranjini Ramesh, Richard G. Morgan, David J. Mee
Summary: This paper presents the first results of two-dimensional heat transfer in an expansion tube using infrared thermography at a Mars entry condition. The study demonstrates the suitability of thermography for heat transfer measurements in expansion tubes and its potential for studying wall/near-wall viscous phenomena.
Article
Thermodynamics
Sangkyoung Lee, David J. Mee, Zhigiang Guan, Hal Gurgenci
Summary: This study aims to identify the optimal configuration of hybrid CST and diesel generation for different types of remote locations based on annual simulations involving key system design features. The inclusion of actual weather information and load demand profiles is a novelty in this study. The results show that the system is an economically favourable option and provides substantial environmental benefits.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Engineering, Aerospace
David J. Mee, Sreekanth Raghunath, Matthew McGilvray
Summary: This paper presents a new design of arrays of thin-film heat transfer to detect the initiation location of turbulent spots in transitional hypersonic boundary layers. Experimental results show that some spots form between the rows before the formation of the first row, indicating that the breakdown of laminar boundary layers is not concentrated in a small region in the current hypersonic flows.
JOURNAL OF SPACECRAFT AND ROCKETS
(2023)
Article
Engineering, Aerospace
Sreekanth Raghunath, David Mee, Roddam Narasimha