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Full blended blade and endwall design of a compressor cascade

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Chinese Journal of Aeronautics 2021年第11期34卷 79-93页

作者： tongtong meng Guang YANG Ling ZHOU Lucheng JI School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China Poly Technologies Inc. Beijing 100010China Institute for Aero Engine Tsinghua UniversityBeijing 100084China

In the current state-of-the-art,high-loss flow in the endwall significantly influences compressor ***,the control of endwall corner separation in compressor blade rows is important to *** on the previous research of the Blended Blade and End Wall(BBEW)technique,which can significantly reduce corner separation,in combination with a nonaxisymmetric endwall,the full-BBEW technique is proposed in this study to further reduce the separation in endwall *** principle of the unchanged axial passage area is considered to derive the geometric method for this *** models are further classified based on different geometric characteristics of this technique:the BBEW model,Inclining-Only End Wall(IOEW)model,and full-BBEW *** most effective design of each model is then found by performing several optimizations at the design point and related numerical investigations over the entire operational *** with the prototype,the total pressure loss coefficient decreases by 7%–9%in the optimized full-BBEW at the design ***,the aerodynamic blockage coefficient over the entire operational range decreases more than the other models,which shows its positive effect for *** approach has a larger decrease at negative incidence angles where the intersection of the boundary layer plays an important role in corner *** analysis shows that the blended blade profile enlarges the dihedral angle and creates a span-wise pressure gradient to move low momentum fluid towards the ***,the inclining hub geometry accelerates the accumulated flow in the corner downstream by increasing the pressure ***,though losses in the mainstream grow,especially for large incidences,the full-BBEW technique effectively reduces the separation in corners.

关键词： Aerodynamics Blended Blade and End Wall(BBEW) Corner separation Endwall profiling Flow control Turbomachinery

Aerodynamic adjoint optimization of turbomachinery with direct control on blade design parameters

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Chinese Journal of Aeronautics 2023年第11期36卷 119-134页

作者： Xin LI tongtong meng Weiwei LI Ling ZHOU Lucheng JI Institute for Aero Engine Tsinghua UniversityBeijing 100084China School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

Nowadays,the adjoint method has become a popular approach in the optimization of turbomachinery to further improve its aerodynamic ***,design variables in these adjoint optimization applications are generally not direct design parameters of blade(such as wedge angles or maximum thickness),making the geometric variation by adjoint optimization can hardly be re-extracted as the change of each design *** giving considerations to the G1 continuity constraint of adjoint method on its parameterization method,this manuscript shows how to apply a parameterization method in 3D blade design process into adjoint *** all design parameters can therefore be treated as design variables in the adjoint method and then participate in the sensitivity-based ***,a fitted Rotor 67 blade is optimized and the adiabatic efficiency is significantly improved by nearly 0.91%.

关键词： Adjoint method Parameterization method Aerodynamic optimization Customized blading method Compressor Turbomachinery

Integrated passage design based on extended free-form deformation and adjoint optimization

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Chinese Journal of Aeronautics 2023年第4期36卷 148-164页

作者： Xin LI tongtong meng Weiwei Li Ling ZHOU Lucheng JI Institute for Aero Engine Tsinghua UniversityBeijing 100084China School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

Inspired by the three-dimensional design of flow passages in turbomachinery,this study proposes the concept of integrated passage *** capability of adjoint method for efficient optimization and the flexibility of the parameterization method based on extended free-form defor-mation have been considered to develop a feasible approach to design an integrated *** concept was applied to redesign a typical transonic fan,Rotor 67,and the results were analyzed by *** is shown that the passage was adequately adjusted in all three dimensions and reduced the strength of shock wave and wake-induced *** particular,the secondary flow was appropriately reorganized and the corner separation was well controlled in the end wall region,leading to signif-icant improvements in adiabatic efficiency and diffusion.

关键词： Turbomachinery Aerodynamic Transonic flow Integrated passage design Extended free-form defor-mation Adjoint optimization

分散型催化剂在煤/重油共炼体系中的加氢抑焦作用

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化工学报 2024年第7期75卷 2556-2564页

作者：杨露刘聪聪孟彤彤张博远杨腾飞邓文安王晓斌山东理工大学化学化工学院山东淄博255000 淄博市产品质量检验研究院山东淄博255000 中国石油大学(华东)化学化工学院山东青岛266580

采用马瑞常渣与印尼褐煤进行煤/重油加氢共炼反应,研究了马瑞常渣脱除沥青质和催化剂加量对共炼体系加氢转化深度的影响。利用XRD、XPS、TEM、TG、^(13)C NMR和SEM对共炼反应后固体残渣进行表征。结果表明,沥青质的存在会促进生焦过程... 详细信息

采用马瑞常渣与印尼褐煤进行煤/重油加氢共炼反应,研究了马瑞常渣脱除沥青质和催化剂加量对共炼体系加氢转化深度的影响。利用XRD、XPS、TEM、TG、^(13)C NMR和SEM对共炼反应后固体残渣进行表征。结果表明,沥青质的存在会促进生焦过程并显著降低共炼体系中煤的转化效率,达到同等转化深度时脱沥青油体系中所需催化剂加量大幅度降低。对于沥青质含量较高的马瑞常渣体系,催化剂反应后固体残渣中有机碳质组分芳香度降低,含氧组分比重下降,且残余有机碳也更易发生热解,表明催化剂对反应体系中碳质组分优异的氢解作用。固体残渣的微观形貌分析则显示出催化剂对生焦过程的良好抑制效果,有助于提高反应体系的加氢转化深度。

关键词：分散催化剂加氢沥青质生焦

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Tetraethylenepentamine-functionalized magnetic mesoporous composites as a novel adsorbent for the removal Cr(Ⅲ)-ethylenediaminetetraacetic acid in complex solution

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Chinese Journal of Chemical Engineering 2024年第4期68卷 16-26页

作者： Zhi Hu Jiahong Wang tongtong Sun School of Environmental Science and Engineering Shaanxi University of Science&TechnologyXi'an 710021China Shaanxi Key Laboratory of Green Preparation and Functionalization of Inorganic Materials Xi'an 710021China

A novel tetraethylenepentamine(TEPA) functionalized magnetic mesoporous silica adsorbent(FNMs/TEPA) was prepared for the adsorption of Cr(Ⅲ)-ethylenediaminetetraacetic acid(EDTA)from wastewater. The characterization of the prepared adsorbent certified that TEPA was modified onto the magnetic mesoporous silicon(FNMs), while FNMs/TEPA maintained the ordered mesoporous and pristine magnetic properties. The batch adsorption experiments demonstrated that TEPA significantly enhanced the removal capacity of the adsorbent for Cr(Ⅲ)-EDTA. FNMs/TEPA exhibited an excellent adsorption property(13.84 mg·g-1) at p H 4.0. Even in the presence of high concentrations of coexisting ions and organic acids, the adsorption performance of FNMs/TEPA was stable. Experimental characterization and DFT demonstrated that the adsorption of Cr(Ⅲ)-EDTA was ascribed to the electrostatic interaction, hydrogen bonding, and complexation between Cr(Ⅲ)-EDTA and amino groups on the adsorbent surface. The analysis of the independent gradient model(IGM) shows that electrostatic interaction is the main mode of action in the adsorption process. Moreover, FNMs/TEPA demonstrated remarkable reusability in three regeneration cycles. These findings indicated that FNMs/TEPA possessed excellent application prospects in the disposal of wastewater containing Cr(Ⅲ)-EDTA.

关键词： TEPA functionalized magnetic mesoporous silicon Adsorption Cr(III)-EDTA Density functional theory calculations

Evolution and conservation genetics of pangolins

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Integrative Zoology 2024年第3期19卷 426-441页

作者： tongtong GU Jingyang HU Li YU State Key Laboratory for Conservation and Utilization of Bio-Resource in Yunnan School of Life SciencesYunnan UniversityKunmingChina

Pangolins(Pholidota,Manidae)are classified as an evolutionarily distinct and globally endangered mammal due to their unique morphology(nail-like scales and a myrmecophagous diet)and being the victim of heavy poaching and worldwide *** such,pangolins serve as a textbook example for studying the special phenotypic evolutionary adaptations and conservation genetics of an endangered *** years have demonstrated significant advancements in the fields of molecular genetics and genomics,which have translated to a series of important research achievements and breakthroughs concerning the evolution and conservation genetics of *** review comprehensively presents the hitherto advances in phylogeny,adaptive evolution,conservation genetics,and conservation genomics that are related to pangolins,which will provide an ample understanding of their diversity,molecular adaptation mechanisms,and evolutionary *** addition,we highlight the priority of investigating species/population diversity among pangolins and suggest several avenues of research that are highly relevant for future pangolin conservation.

关键词： adaptive evolution conservation genetics conservation genomics pangolins phylogeny

Immunoglobulin superfamily containing leucine-rich repeat(ISLR)negatively regulates osteogenic differentiation through the BMP-Smad signaling pathway

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Genes & Diseases 2024年第4期11卷 138-140页

作者： Lei Xiong Miaomiao Lan Chang Liu Lei Li YingYing Yu tongtong Wang Fan Liu Kun Wang Jin Liu Qingyong meng State Key Laboratory of Agrobiotechnology College of Biological SciencesChina Agricultural UniversityBeijing 100094China

Osteoporosis(OP)is an aging-associated condition that significantly affects the quality of life in aging humans and has few treatment *** an important marker,recombinant immunoglobulin superfamily containing leucinerich repeat(ISLR)could be used as a gene therapy for *** herein used alkaline phosphatase(ALP)and alizarin red S(ARS)staining to evaluate osteogenic differentiation potential.

关键词： Immunoglobulin alkaline herein

Measurement of acceleration and angular velocity of particles during a 3D silo discharge

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Particuology 2024年第9期92卷 61-71页

作者： tongtong Mu Yiming Li Quan Chen Ran Li Hui Yang College of Medical Instrument Shanghai University of Medicine and Health SciencesShanghai201318China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai200093China

Accurate measurement of the three-dimensional(3D)movement of discrete particles is crucial for comprehending complex granular rheology in *** this paper,the acceleration and angular velocity of particles in 3D silos are measured by using a spherical detector based on inertial technology and magnetic positioning *** acceleration of particles is the largest in the center of silos,which suggest that the resistance generated by friction and extrusion is the ***,the angular velocity distribution follows lognormal function except for particles near the *** correlation between acceleration and angular velocity is opposite in different flow *** reveals for the first time that the extent to which the resultant force on the particles affects their rotational motion is related to the flow *** results have practical significance for regulating the granular flow pattern and optimizing the structural design of silos.

关键词： Granularflow Silo Angular velocity Acceleration

Surface Defect Detection and Evaluation Method of Large Wind Turbine Blades Based on an Improved Deeplabv3+Deep Learning Model

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Structural Durability & Health Monitoring 2024年第5期18卷 553-575页

作者： Wanrun Li Wenhai Zhao tongtong Wang Yongfeng Du Institution of Earthquake Protection and Disaster Mitigation Lanzhou University of TechnologyLanzhou730050China International Research Base on Seismic Mitigation and Isolation of GANSU Province Lanzhou University of TechnologyLanzhou730050China Disaster Prevention and Mitigation Engineering Research Center of Western Civil Engineering Lanzhou University of TechnologyLanzhou730050China

The accumulation of defects on wind turbine blade surfaces can lead to irreversible damage,impacting the aero-dynamic performance of the *** address the challenge of detecting and quantifying surface defects on wind turbine blades,a blade surface defect detection and quantiﬁcation method based on an improved Deeplabv3+deep learning model is ***,an improved method for wind turbine blade surface defect detection,utilizing Mobilenetv2 as the backbone feature extraction network,is proposed based on an original Deeplabv3+deep learning model to address the issue of limited ***,through integrating the concept of pre-trained weights from transfer learning and implementing a freeze training strategy,signiﬁcant improvements have been made to enhance both the training speed and model training accuracy of this deep learning ***,based on segmented blade surface defect images,a method for quantifying blade defects is *** method combines image stitching algorithms to achieve overall quantiﬁcation and risk assessment of the entire *** results show that the improved Deeplabv3+deep learning model reduces training time by approximately 43.03%compared to the original model,while achieving mAP and MIoU values of 96.87%and 96.93%,***,it demonstrates robustness in detecting different surface defects on blades across different *** application of a blade surface defect quantiﬁcation method enables the precise quantiﬁcation of dif-ferent defects and facilitates the assessment of risk levels associated with defect measurements across the entire *** method enables non-contact,long-distance,high-precision detection and quantiﬁcation of surface defects on the blades,providing a reference for assessing surface defects on wind turbine blades.

关键词： Structural health monitoring computer vision blade surface defects detection Deeplabv3+ deep learning model