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Computer Modeling in Engineering & Sciences 2024年第3期138卷 3033-3049页

作者： Chunlei Ruan Cengceng Dong kunfeng liang Zhijun Liu Xinru Bao Mathematics&Statistics School Henan University of Science&TechnologyLuoyang471023China Longmen Laboratory Luoyang471023China College of Vehicle and Traffic Engineering Henan University of Science&TechnologyLuoyang471023China

Using Euler’s first-order explicit(EE)method and the peridynamic differential operator(PDDO)to discretize the time and internal crystal-size derivatives,respectively,the Euler’s first-order explicit method–peridynamic differential operator(EE–PDDO)was obtained for solving the one-dimensional population balance equation in *** different conditions during crystallization were studied:size-independent growth,sizedependent growth in a batch process,nucleation and size-independent growth,and nucleation and size-dependent growth in a continuous *** high accuracy of the EE–PDDO method was confirmed by comparing it with the numerical results obtained using the second-order upwind and HR-van *** method is characterized by non-oscillation and high accuracy,especially in the discontinuous and sharp crystal size *** stability of the EE–PDDO method,choice of weight function in the PDDO method,and optimal time step are also discussed.

关键词： Population balance equation crystallization peridynamic differential operator Euler’s first-order explicit method

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大容量磷酸铁锂电池模组热失控研究

储能科学与技术 2024年第7期13卷 2462-2469页

作者：曹勇杨大鹏朱清梁坤峰周训常艳琴中航锂电(洛阳)有限公司河南洛阳471003 河南科技大学车辆与交通工程学院河南洛阳471000

随着新能源产业的快速发展,锂离子电池被广泛应用在储能领域,其存在的安全问题不容忽视。本文针对锂离子电池模组在使用过程中的热安全问题,以大容量磷酸铁锂电池模组为研究对象,通过实验与数值模拟相结合的方式,研究热失控蔓延过程中... 详细信息

随着新能源产业的快速发展,锂离子电池被广泛应用在储能领域,其存在的安全问题不容忽视。本文针对锂离子电池模组在使用过程中的热安全问题,以大容量磷酸铁锂电池模组为研究对象,通过实验与数值模拟相结合的方式,研究热失控蔓延过程中电池模组表面的温度特性,搭建磷酸铁锂电池模组热失控仿真模型,分析不同厚度气凝胶垫对热失控蔓延的影响,及热失控过程中能量传递过程。结果表明:厚度为0.7 mm、1.2 mm的气凝胶垫均可抑制电池模组热失控蔓延;增大气凝胶垫厚度,可以有效降低被保护电池的峰值温度;加入气凝胶垫后的2#电池没有接收到足够的热量,内部发生不可逆反应放热,热失控在某一节点停止,电池内部未完全发生热失控。通过本研究可提高热失控仿真模型的准确度,在方案阶段进行热安全特性预判,提升产品的热安全性。

关键词：安全热失控储能温度特性电池

Energy and Exergy Analysis of a Cooling/Power Cogeneration Ejector Refrigeration System

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Journal of Thermal Science 2022年第2期31卷 448-462页

作者： YANG Mengke LI Xiuzhen WANG Lin YUAN Junfei WANG Zhanwei liang kunfeng Institute of Refrigeration and Air conditioning Henan University of Science and TechnologyLuoyang 471023China

The organic Rankine cycle is introduced into the conventional ejector refrigeration(CER)system to establish the low-grade heat-driven cooling/power cogeneration ejector refrigeration(CPC-ER)system using the isobutane as the *** comparison with the CER system where external power is consumed by the circulating pump,the power output from the CPC-ER system is more than the power consumption of its circulating pump so that a portion of net power is derived from the CPC-ER *** on the mathematical model of thermodynamics,energy and exergy analysis of the CPC-ER system is carried out and compared with the CER *** results reveal that the equivalent coefficient of performance(COP)of the CPC-ER system is 41.14%to 71.30%higher than that of the CER system,and the exergy efficiency of the CPC-ER system is 1.32 to 1.49 times higher than that of the CER *** the power produced by the turbine and the total exergy output from the CPC-ER system approach the maximum,as the generating temperature in the generator is up to 80°*** CPC-ER system has the higher energy utilization efficiency than the CER system,and it is suitable for the cooling and power-required places with low-grade thermal sources.

关键词： ejector refrigeration exergy power consumption equivalent COP

Thermodynamic Evaluation of Transcritical CO_(2) Heat Pump Considering Temperature Matching under the Constraint of Heat Transfer Pinch Point

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Journal of Thermal Science 2021年第3期30卷 869-879页

作者： LIU Ruijian GAO Fengling liang kunfeng WANG Lin WANG Moran MI Guoqiang LI Yachao Institute of Refrigeration and Air-Conditioning Henan University of Science and TechnologyLuoyang 471003China

The non-linear temperature glide in the supercritical CO_(2) cooling process makes the heat transfer pinch point of heat exchanger show multiplicity,like size,location distribution and quantity,which makes the thermodynamic performance of the CO_(2) transcritical cycle more complex and eventually affects the evaluation of the optimal operating state of the *** on the second law of thermodynamics and the constraints of heat transfer pinch,a thermodynamic evaluation method of CO_(2) transcritical heat pump system was proposed according to the degree of temperature *** influence mechanism of multi-characteristic change of heat transfer pinch point on temperature matching degree and the effect of temperature matching degree on thermodynamic performance of CO_(2) transcritical heat pump system were *** relationship between temperature matching degree,COP and exergy efficiency of the system was *** is considered that the change of temperature matching index value can clearly characterize the change trends of COP and exergy *** is,the smaller the temperature matching degree is,the closer the temperature distribution of heat transfer fluids on both sides of the heat exchanger is to Lorenz cycle,and the greater the COP and exergy efficiency ***,by monitoring the outlet temperature of the CO_(2) cooler,which has an essential relationship with the temperature matching degree during the heat exchange process,the deviation between actual and optimal working condition can be judged online,which is beneficial to real-time evaluation of the working state of the system.

关键词： heat pump CO_(2)transcritical cycle temperature matching degree exergy COP pinch point

Integrated optical frequency transfer and optical physical layer key distribution with enhanced link reciprocity detection

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Science China(Information Sciences) 2024年第7期67卷 335-336页

作者： kunfeng XIE liang HU Jianping CHEN Guiling WU State Key Laboratory of Advanced Optical Communication System and Networks Department of Electronic EngineeringShanghai Jiao Tong University

Optical fiber transmission has been widely used in communications and metrology, wherein optical frequency transfer (OFT) and optical physical layer secure key distribution (OKD) have become research hotspots [1, 2]. Moreover,OFT can perform a comparison between state-of-the-art optical atomic clocks and implement coherent optical phase transfer over long distances to support geodesy [1, 3].

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双碳目标下工程热力学层次研究型教学模式探索

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洛阳理工学院学报（自然科学版） 2024年第3期34卷 88-92页

作者：王慧荣梁坤峰董彬周训高凤玲汤奇雄李堃冯业河南科技大学车辆与交通工程学院河南洛阳471000

双碳背景下,我国能源结构转型为高校能源动力类的人才培养提供了机遇和挑战,“新工科”时代也亟需培养具有创新实践能力和国际竞争力的高素质复合型人才。工程热力学是研究能源科学的基础课程,对其进行教学改革及其实践路径探索对于人... 详细信息

双碳背景下,我国能源结构转型为高校能源动力类的人才培养提供了机遇和挑战,“新工科”时代也亟需培养具有创新实践能力和国际竞争力的高素质复合型人才。工程热力学是研究能源科学的基础课程,对其进行教学改革及其实践路径探索对于人才培养具有重要意义。对课程内容进行模块化分析,提出“五个层次”的研究型教学模式,在尊重学生个体差异的前提下注重培养学生的创新思维和实践创造能力,实现能力与情感双重培养目标。

关键词：研究型教学模块化知识体系创新人才五个层次

Ice Slurry Formation in a Cocurrent Liquid-Liquid Flow

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Chinese Journal of Chemical Engineering 2008年第4期16卷 552-557页

作者：彭正标袁竹林梁坤峰蔡杰 School of Energy and Environment Southeast University Nanjing 210096 China

A new technique for ice slurry production was explored. Multiple small water-drops were formed in another immiscible chilled liquid by a single-nozzled atomizer and frozen in the fluidized bed by direct contact heat transfer. Experiments were conducted to investigate the dynamic behaviors of the ice crystal making system. The results demonstrate that the ice crystals could be produced continuously and stably in the vertical bed with the circulating coolant of initial temperature below -5℃. The size distribution of the ice crystals appears non-uniform, but is more similar and more uniform at lower oil flow rate. The mean ice crystal size rests seriously with the jet velocity and the oil flow rate. It decreases with decreasing the oil flow rate, and reaches the maximum at an intermediate jet velocity at about 16.5 m.s y. The ice crystal size is also closely related to the phenomenon of drop-coalescing, which can be alleviated considerably by reducing the flow rate or lowering the temperature of the carrier oil. However, optimization of liquid-liquid atomization is a more effective approach to produce fine ice crystals of desired size.

关键词： ice slurry drop-coalescing ice crystal size distribution liquid-liquid atomization

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自复叠制冷系统4种组分配比性能

化工学报 2016年第5期67卷 1830-1836页

作者：芮胜军张华董彬梁坤峰河南科技大学车辆与交通工程学院河南洛阳471023 上海理工大学制冷技术研究所上海200093

自动复叠制冷在小型制冷低温装置中有较强的应用优势,它能制取氮气液化温度77 K到常规单机压缩制冷温度230 K温区。针对三级自动复叠制冷系统非共沸混合制冷工质不同组分配比进行实验研究,对比分析了R600a、R23和R14混合制冷剂4种组分配... 详细信息

自动复叠制冷在小型制冷低温装置中有较强的应用优势,它能制取氮气液化温度77 K到常规单机压缩制冷温度230 K温区。针对三级自动复叠制冷系统非共沸混合制冷工质不同组分配比进行实验研究,对比分析了R600a、R23和R14混合制冷剂4种组分配比35/35/30、35/30/35、30/35/35和35/25/40,根据压缩机的运行工况和蒸发器的降温特性可以得到4种配比的各项运行性能参数比较接近,组分配比35/30/35的蒸发温度较低。蒸发器设计冷负荷为60 W,设计蒸发温度为180 K,低温冷柜内的蒸发温度最低可以达到并稳定在175 K。根据两种组分配比35/35/30和35/30/35在不同冷负荷时的蒸发器制冷特性实验研究,组分配比35/30/35的最高COP为8.47%;组分配比35/35/30的最高COP为14.4%。

关键词：自复叠制冷系统 R600a/R23/R14 组分配比非共沸混合工质

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液-液循环流化制冰床流化特性研究

农业机械学报 2012年第5期43卷 210-215页

作者：梁坤峰高春艳王林河南科技大学车辆与动力工程学院洛阳471003 河南科技大学规划与建筑工程学院洛阳471003

基于图像采集与处理方法实验研究了液-液循环流化制冰床的流化特性,发现颗粒的聚团、分散、粘连和聚并4个典型流化特征,获得了颗粒的沿程粒径分布,基于弗劳德准则数Fr揭示了颗粒流化特征与液-液循环流化床流化状态的相关性,讨论了流化... 详细信息

基于图像采集与处理方法实验研究了液-液循环流化制冰床的流化特性,发现颗粒的聚团、分散、粘连和聚并4个典型流化特征,获得了颗粒的沿程粒径分布,基于弗劳德准则数Fr揭示了颗粒流化特征与液-液循环流化床流化状态的相关性,讨论了流化床散式流化状态的参数区域。结果表明,颗粒的流化特征和沿程粒径分布随液-液循环流化床高度、运行参数及参数组合的变化而发生改变;距液-液循环流化床底部0.50 m高度内首先发生颗粒的聚团流化,受颗粒相变程度影响,进而在流化床0.50 m高度以上形成颗粒的聚并、粘连和分散流化,但颗粒聚并形成更大颗粒的现象不可避免;液-液循环流化床的流化状态由弗劳德准则数判别,并与颗粒的流化特征相对应,其理想的流化状态——散式流化主要发生在分散液体流量较小、循环液体流速和温度较低的区域。

关键词：流体冰液-液循环流化床流化特性运行参数图像分析

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液-液循环流化床液滴形成特性研究

农业机械学报 2011年第8期42卷 228-234页

作者：梁坤峰高春艳王林河南科技大学车辆与动力工程学院洛阳471003 河南科技大学规划与建筑工程学院洛阳471003

基于图像采集与处理方法对液-液循环流化床液滴形成特性进行了实验研究,提出了形成液滴的3种液-液雾化方式,考察了液-液雾化方式与射流长度脉动、液滴粒径分布的相关性,获得了液-液雾化方式的转变规律以及雾化强度、射流长度脉动和液滴... 详细信息

基于图像采集与处理方法对液-液循环流化床液滴形成特性进行了实验研究,提出了形成液滴的3种液-液雾化方式,考察了液-液雾化方式与射流长度脉动、液滴粒径分布的相关性,获得了液-液雾化方式的转变规律以及雾化强度、射流长度脉动和液滴粒径分布基于相对雷诺数的变化规律。结果表明,雾化过程与相对雷诺数密切相关,随着相对雷诺数的增加,雾化强度持续增强,液-液雾化方式由滴流型向层流射流型转变,最后发展为湍流射流型;在整个相对雷诺数实验范围内,射流长度的脉动表现出随机和非周期的特点,其标准方差与平均值的变化规律基本一致,在相对雷诺数为1.3×104时达到最大值;液滴的粒径分布参数一直增大到湍流射流型雾化阶段,在相对雷诺数为2.5×104时,液滴的粒径均匀性最好,而液滴平均粒径总体上随相对雷诺数的增大不断减小,形成液滴的最小平均粒径发生在湍流射流型雾化阶段。

关键词：流体冰液-液循环流化床液-液雾化液滴形成特性射流