Article
Thermodynamics
Wubin Weng, Henrik Feuk, Shen Li, Mattias Richter, Marcus Alden, Zhongshan Li
Summary: Accurate in-situ optical measurements were conducted on the burning process of different biomass pellets in various combustion atmospheres. The results showed that the surface temperature and volatile gas temperature of biomass pellets have a significant impact on the combustion process, and the weight of released PAH molecules shifts towards lighter with a reduction of gas environment temperature.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Optics
Tobias Sander, Matthias Lettl, Colum Walter, Christian Mundt
Summary: In this study, a one-dimensional and two-dimensional two-photon absorption laser-induced fluorescence (CO-TALIF) thermometry technique was used to quantify the temperature field of a medium-to high-enthalpy CO2 flow. The temperature measurements were conducted using experimental and simulated excitation spectra, and plausible results were obtained.
APPLIED PHYSICS B-LASERS AND OPTICS
(2023)
Article
Thermodynamics
Stephen W. Grib, Christopher A. Fugger, Paul S. Hsu, Naibo Jiang, Sukesh Roy, S. Alexander Schumaker
Summary: This work demonstrates single-shot, two-dimensional temperature measurements in a premixed linear detonation channel using two-color OH planar laser-induced fluorescence thermometry. The technique was found suitable for detonation environments based on spectral characteristics, and the precision and accuracy of the method were evaluated under different conditions. The ability to distinguish and quantify detonation burning behavior shows promise for future applications in pressure-gain combustion facilities.
COMBUSTION AND FLAME
(2021)
Article
Engineering, Environmental
Hanbin Shi, Nathalie Di Miceli Raimondi, Emmanuel Cid, Michel Cabassud, Christophe Gourdon
Summary: The use of PLIF method in compact reactors allows for non-intrusive temperature measurements with good sensitivity, showing the potential of detecting temperature heterogeneities in such devices. The technique provides a high spatial and temporal resolution, making it suitable for studying heat transfer mechanisms and designing intensified reactors.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Xiaofeng Wu, Shiping Zhan, Junbo Han, Yunxin Liu
Summary: Lattice self-adaptation is found to remarkably enhance the thermal sensitivity of upconversion nanoparticles by utilizing the thermally sensitive fluorescence intensity ratio of the dopant Er3+ and lattice distortion at the interface. The core/shell upconversion nanoparticles with lattice self-adaptation showed three times higher thermal sensitivity compared to core-only nanoparticles.
Article
Engineering, Electrical & Electronic
Bo Li, Dayuan Zhang, Christian Brackmann, Lei Han, Zhanyu Feng, Qiang Gao, Zhongshan Li
Summary: Nonintrusive temperature measurement is crucial in combustion research. In this study, a thermometric technique based on femtosecond two-photon laser-induced fluorescence of carbon monoxide (CO-fs-TPLIF) was proposed. The technique allows for simultaneous excitation and detection of dual vibrational bands of CO, enabling assessment of temperature-dependent Boltzmann distribution and extraction of temperature from fluorescence spectra. Two temperature calibration methods were developed.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Physics, Multidisciplinary
Hannah Ulrich, Sophie Sigl, Michael Mohnle, Edouard Berrocal, Lars Zigan
Summary: In this study, two-color laser-induced fluorescence (2c-LIF) is used to calibrate and measure the temperature in a micrometric monodisperse ethanol droplet chain. The fluorescence signals of two dyes, fluorescein disodium (FL) and sulforhodamine 101 (SRh), are used to form a sensitive signal ratio. Spectral and planar fluorescence detection systems are set up to analyze the temperature sensitivity of the dyes and potential cross-talk effects. The calibrated signal ratios are applied to measure the temperature of evaporating heated droplets in the chain.
FRONTIERS IN PHYSICS
(2023)
Article
Thermodynamics
Vladimir Dulin, Dmitriy Sharaborin, Roman Tolstoguzov, Aleksei Lobasov, Leonid Chikishev, Dmitriy Markovich, Sirui Wang, Chen Fu, Xunchen Liu, Yuyang Li, Yi Gao
Summary: The present study assesses the effectiveness of single-shot 2D temperature measurements using thermally assisted OH PLIF, finding that the method is most sensitive to temperature changes for the Q(1)(8) transitions. Experimental results show that this approach can effectively detect hot regions in turbulent flames.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Materials Science, Multidisciplinary
V. S. Zanuto, O. A. Capeloto, R. F. Muniz, M. Sandrini, J. H. Rohling, M. L. Baesso, L. A. O. Nunes
Summary: This study reports the Eu2+/Eu3+-doped low-silica calcium aluminosilicate glass as a potential candidate for high sensitive ratiometric thermometer. Two different approaches were presented, both showing high reproducibility and relative sensitivity values.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Chemistry, Multidisciplinary
Shinya Kobori, Sungjoon Huh, Solomon D. Appavoo, Andrei K. Yudin
Summary: The development and use of composite two-dimensional barriers in macrocyclic backbones allow for the control of conformation through heterocyclic rearrangements. Kinetic studies show different in-plane atom movement speeds in rings of different sizes, while analysis suggests the rare cis-amide motifs can be maintained during conformational interconversion. These findings contribute fundamental insights for the development of various conformational control elements.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Multidisciplinary Sciences
Ruishen Meng, Michel Houssa
Summary: Using spin-polarized first-principles calculations, we investigate the stability, electronic properties, and magnetic behavior induced by hole-doping in 2D PbBr2 and HgBr2. These nonmagnetic materials can exhibit stable ferromagnetic order when hole-doped at high densities. Intrinsic and extrinsic defects, such as vacancies and antisites, affect the hole-doping and subsequent ferromagnetism. Li substituting Pb or Hg, and S replacing Br in 2D HgBr2, are potential dopants that can produce shallow acceptor states and result in stable ferromagnetic order in these dibromides.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Mechanical
Guohua Li, Zhenrong Zhang, Jingfeng Ye, Sheng Wang, Bolang Fang, Jun Shao, Zhiyun Hu, Jinhua Wang, Zuohua Huang
Summary: This study explores the feasibility of using photolysis of dissolved water to generate additional OH in low-temperature and non-reaction zones for temperature measurements in a combustion-flow field. The results show that photo-fragment PLIF (PF-PLIF) is accurate and effective in low-temperature flow fields, providing a valuable supplement to traditional PLIF measurements for analysis and model validation of combustion processes in low temperature.
EXPERIMENTS IN FLUIDS
(2021)
Article
Chemistry, Multidisciplinary
Le Shi, Yushuan Gao, Zhixuan Ying, Ao Xu, Yonghong Cheng
Summary: Two-dimensional clay materials exhibit excellent thermal and chemical stability, and their atomic structures with tubular channels provide potential pathways for proton penetration. This study explores and investigates the mechanism of proton penetration across 2D clay nanosheets with various isomorphic substitutions and counterions using molecular dynamics simulations. The presence of negative surface charges significantly reduces the energy barrier for proton penetration, making it a promising choice for high-temperature proton exchange membranes. Additionally, the proton conductivity of single-layer clay materials can be tuned by altering the isomorphic substitutions.
Review
Physics, Applied
Xiaohui Ling, Zan Zhang, Shizhen Chen, Xinxing Zhou, Hailu Luo
Summary: Optical beam shifts, such as Goos-Hanchen shift and spin-Hall shift, are prevalent in basic optical processes and can be used to explore and characterize 2D atomic crystals. They have great potential for applications in precision metrology and sensing due to their sensitivity to material parameter changes.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Hao Wang, Xin-Zhu Yin, Yang Liu, Ya-Ping Li, Mei-Yan Ni, Na Jiao, Hong-Yan Lu, Ping Zhang
Summary: Based on first-principles calculations, a new 2D stable material W2C3 is predicted, which exhibits metallic properties after hydrogenation with enhanced electron-phonon coupling (EPC) strength and a calculated critical temperature (Tc) of 40.5 K. Furthermore, compressive strain can soften low-frequency phonons and enhance EPC strength, leading to an increased Tc of W2C3H2 from 40.5 K to 49.1 K. This work paves the way for a new platform for 2D superconductivity.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Thermodynamics
Miao Zhang, Saeed Derafshzan, Mattias Richter, Marcus Lundgren
Article
Thermodynamics
Alexios Matamis, Sara Lonn, Ludovica Luise, Bianca Maria Vaglieco, Martin Tuner, Oivind Andersson, Marcus Alden, Mattias Richter
Summary: Methanol is a promising candidate for renewable fuels, derived from waste materials with global infrastructure support for adoption and high efficiency. Despite limited research on methanol compression-ignition, its low soot properties make it a viable option for engines.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Thermodynamics
Wubin Weng, Henrik Feuk, Shen Li, Mattias Richter, Marcus Alden, Zhongshan Li
Summary: Accurate in-situ optical measurements were conducted on the burning process of different biomass pellets in various combustion atmospheres. The results showed that the surface temperature and volatile gas temperature of biomass pellets have a significant impact on the combustion process, and the weight of released PAH molecules shifts towards lighter with a reduction of gas environment temperature.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Letter
Engineering, Chemical
M. Alsved, A. Matamis, R. Bohlin, M. Richter, P. -E. Bengtsson, C. -J. Fraenkel, P. Medstrand, J. Londahl
AEROSOL SCIENCE AND TECHNOLOGY
(2020)
Article
Optics
Christian Binder, Henrik Feuk, Mattias Richter
JOURNAL OF LUMINESCENCE
(2020)
Article
Engineering, Mechanical
Arman Ahamed Subash, Haisol Kim, Sven-Inge Moller, Mattias Richter, Christian Brackmann, Marcus Alden, Andreas Lantz, Annika Lindholm, Jenny Larfeldt, Daniel Lorstad
Summary: Fuel and load flexibility are key features of industrial gas turbines to accommodate renewable fuels and grid fluctuations. Experimental investigations on a standard DLE burner studied the effects of fuel additions, load variations, and hydrogen enrichment on a natural gas flame. The addition of hydrogen affected flame characteristics, while load variations influenced flame behavior.
JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME
(2021)
Article
Physics, Fluids & Plasmas
Yupan Bao, Karolina Dorozynska, Panagiota Stamatoglou, Chengdong Kong, Tomas Hurtig, Sebastian Pfaff, Johan Zetterberg, Mattias Richter, Elias Kristensson, Andreas Ehn
Summary: The study utilized laser-induced fluorescence technique to investigate the distribution of OH radicals near a glow-type gliding arc plasma, with interference of plasma emission subtracted by the FRAME technique. The results suggest that gas dynamics greatly influence the distribution of OH radicals around the plasma.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Henrik Feuk, David Sanned, Mattias Richter, Marcus Alden
Summary: This study investigates the nonlinearities of photomultiplier tubes (PMTs) in different decay times in order to assess and minimize their impact on temperature measurement accuracy. Experimental results show that saturation effects or nonlinearity effects in PMTs lead to different changes in measured decay time depending on the decay time range, indicating the varying impact of nonlinearity on measurement accuracy. The introduced methodology for analyzing detector nonlinearity provides a useful resource for accuracy improvement in lifetime phosphor thermometry measurements.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Optics
Wei Zhang, Xue Dong, Zhiwei Sun, Bo Zhou, Zhenkan Wang, Mattias Richter
Summary: This study presents a computational imaging approach using convolutional neural networks for interpolating CH2O PLIF images, achieving higher temporal resolution for visualizing intermediate species in combustion. Results demonstrate the model's ability to accurately predict PLIF images at various axial positions, serving as an efficient offline model to overcome challenges in ultra-high speed PLIF techniques.
Article
Optics
Shen Li, David Sanned, Jianqing Huang, Edouard Berrocal, Weiwei Cai, Marcus Alden, Mattias Richter, Zhongshan Li
Summary: The combustion behavior of iron particles in a laminar diffusion flame was studied, revealing the importance of microexplosive processes. It was observed that microexplosions can impact combustion stability, product formation and result in the generation of planar structures. The release phenomenon during iron particle combustion was characterized by multiple cracked particle shells and hollow structures, with FeO identified as an intermediate species.
Article
Optics
Hao Guo, Wei Zhang, Xiangyu Nie, Xue Dong, Zhiwei Sun, Bo Zhou, Zhenkan Wang, Mattias Richter
Summary: In this paper, a computational imaging method based on deep learning models is proposed to increase the temporal resolution of planar optical measurement in turbulent flames. The method utilizes down-sampled experimental data and trains networks to predict consecutive images of key combustion species. The results show that the convolutional long short-term memory network (CONV-LSTM) provides the best predictions and can generate consecutive images at higher repetition rates.
APPLIED PHYSICS B-LASERS AND OPTICS
(2022)
Article
Instruments & Instrumentation
Henrik Feuk, Sebastian Nilsson, Marcus Alden, Mattias Richter
Summary: The investigation focused on the nonlinearities of photomultiplier tubes (PMTs) in high-speed lifetime phosphor thermometry, with findings suggesting that photocathode bleaching has a significant impact on signal level linearity, while space charge effects are most noticeable at high radiant flux levels and high repetition rates. The best configuration for decay time measurement is to use PMT gain in the recommended range and the highest radiant flux where the PMT response is still linear, maximizing precision without sacrificing accuracy, providing guidelines for improving temperature accuracy in kHz lifetime phosphor thermometry measurements.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Instruments & Instrumentation
Henrik Feuk, Sebastian Nilsson, Mattias Richter
Summary: The decay time distribution of a thermographic phosphor was obtained using the Maximum Entropy Method (MEM), which allows for the identification of decay time components with their associated weights. The MEM highlights significant decay time contributions as peaks in the distribution, providing insights into the lifetime behavior of the phosphor. This method is advantageous for thermometry as it is less affected by multi-exponential decay and does not require assumptions about the number of decay time components.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Engineering, Multidisciplinary
Patrick Nau, Andre Mueller, Niklas Petry, Sebastian Nilsson, Torsten Endres, Mattias Richter, Benjamin Witzel
Summary: Fiber-coupled phosphor thermometry was used to measure online wall temperatures in a full-scale gas turbine combustor fueled with natural gas and up to 100 vol% hydrogen. Two phosphors, YAG:Dy and YAG:Tm;Li, were tested for this application. YAG:Tm;Li showed promise but was found to be incompatible with the used setup due to interference from the laser. A strategy to compensate for flame emission interferences during natural gas operation was developed, enabling single-shot temperature measurements at 15 Hz with a precision of 2-7 K for a 1 s average.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Christian Ibron, Hesammedin Fatehi, Zhenkan Wang, Panagiota Stamatoglou, Marcus Lundgren, Marcus Alden, Mattias Richter, Oivind Andersson, Xue-Song Bai
Summary: Numerical simulation was used to study ignition process, combustion modes, and reaction front propagation in a PPC engine using a primary reference fuel. Different combustion modes and transition from premixed auto-ignition to non-premixed flame were observed. The simulation results showed good agreement with high temporal resolution optical data, indicating the model effectively captured the physics of mixed-mode combustion in PPC engines.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
