Journal of Engineering Thermophysics最新文献_第4页

Up-to-Third-Order Determination of Time Constants of Models of Avionics Thermocouples in Gas Temperature Control Loop of Automatic Control System of Gas Turbine Engine 燃气涡轮发动机自动控制系统气体温度控制回路中航空电子热电偶模型时间常数的三阶上确定方法

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2024-07-17 DOI: 10.1134/S1810232824020127

A. F. Sabitov, I. A. Safina

{"title":"Up-to-Third-Order Determination of Time Constants of Models of Avionics Thermocouples in Gas Temperature Control Loop of Automatic Control System of Gas Turbine Engine","authors":"A. F. Sabitov, I. A. Safina","doi":"10.1134/S1810232824020127","DOIUrl":"10.1134/S1810232824020127","url":null,"abstract":"Ensuring the necessary accuracy of measurement of unsteady temperature of gas in an aircraft gas turbine engine (GTE) is a topical problem. The use of thermocouples in the gas temperature control loop of the automatic control system (ACS) of a GTE is complicated by the need of reducing the thermocouple inertia, which varies significantly in dependence on the GTE operation regimes. The existing methods and means for compensating the inertia of aircraft thermocouples in the gas temperature control loop of the GTE ACS are based solely on the use of a mathematical model of thermocouple in the form of a first-order inertia element. This mathematical description of avionics thermocouples with wire sensors is very approximate. An avionics thermocouple is described more accurately with a second-order mathematical model and in some cases with a third-order one in accordance with OST 1 00334-79 “Temperature Sensors. Dynamic characteristics.” The difficulty with the use of second- and third-order thermocouple models is associated with the need to establish the dependence of all time constants of a selected model on the changing operating regimes of GTE. No such dependencies have been determined yet for practical use. The purpose of this work is to find out the functional dependence of all time constants occurring in mathematical models up to the third-order inclusive on actual operating parameters of GTE. The time constants calculated from the established dependencies can be used for continuous correction of the gas temperature control loop of the GTE ACS to ensure optimal correction of the dynamic characteristics of thermocouples.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 2","pages":"376 - 383"},"PeriodicalIF":1.3,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141721591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Soret and Radiation Effect on MHD Flow over Magnetized Vertical Surface with Hall Current and Induced Magnetic Field 霍尔电流和诱导磁场对磁化垂直表面上 MHD 流动的索雷特效应和辐射效应

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2024-07-17 DOI: 10.1134/S1810232824020164

A. Agrawal, J. P. Panda

引用次数: 0

Exploring the Influence of Surfactants on Methane Hydrate Formation Kinetics Beyond Its Thermodynamic Stability Region from a Supersaturated Solution ’Water + Sodium Lauryl Sulfate + Methane’ 从过饱和溶液 "水 + 十二烷基硫酸钠 + 甲烷 "探索表面活性剂对甲烷水合物热力学稳定区之外形成动力学的影响

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2024-07-17 DOI: 10.1134/S1810232824020115

K. V. Gets, R. K. Zhdanov, Y. Y. Bozhko, O. S. Subbotin, V. R. Belosludov

引用次数: 0

Identifying Transport Properties of Gas from Measurements of Heat Flux at Stagnation Point of Blunt Body. Technique and Experimental Results 通过测量钝体停滞点的热通量确定气体的传输特性。技术和实验结果

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2024-07-17 DOI: 10.1134/S1810232824020139

A. V. Nenarokomov, D. L. Reviznikov, S. A. Budnik, D. M. Titov, A. V. Morzhukhina, A. V. Netelev, I. A. Borisenko

引用次数: 0

Horse Herd Optimization and LSTM Configuration for Minimizing Pressure Drop and Predicting Thermal Performance in Shell and U-Tube Heat Exchanger 优化马群和 LSTM 配置以最小化压降并预测壳管和 U 型管热交换器的热性能

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2024-04-10 DOI: 10.1134/S1810232824010107

Sh. K. Prasad, M. K. Sinha

{"title":"Horse Herd Optimization and LSTM Configuration for Minimizing Pressure Drop and Predicting Thermal Performance in Shell and U-Tube Heat Exchanger","authors":"Sh. K. Prasad, M. K. Sinha","doi":"10.1134/S1810232824010107","DOIUrl":"10.1134/S1810232824010107","url":null,"abstract":"The industrial component that transfers heat from one fluid to another most frequently uses Shell and Tube Heat Exchangers (STHE). Enhancing the heat transfer efficiency of heat exchangers has garnered more attention as a result of scarce energy resources and high energy expenditures. In STHE, the pressure drop is considered an important issue that causes cracks and economic losses. An essential factor in improving the performance of a heat exchanger with low pressure drop was the angle and distance of the baffles. Several methods were developed to reduce pressure drop and speed up heat transfer. But those methods were not provide a satisfactory pressure drop reduction, so the optimal baffle configuration was still a task in the heat exchanger. In the proposed model, Horse-herd Optimization Algorithm (HOA) based baffle design and neural network based thermal performance prediction arrangement was developed to reduce the pressure drop and predict the rate of transferring heat. Shells and tubes were developed at the corresponding material, inside the shell, a baffle was designed to barrier the flow of cold water. The optimal solution of baffle configuration was solved through HOA, which finds the appropriate baffle’s distance and angle by reducing the pressure drop. After the water flow modelling, the seven key parameters values were observed, and create a dataset. Using this data, a thermal performance prediction system was developed to analyze each period input value to predict the net energy, heat transfer rate, and Nussle number. The proposed model provides 52 Pa pressure drop, 0.59 effectiveness, 0.59 NTU, 417 U, and 92% accuracy. The output of the suggested approach is contrasted with that of other current methods for validation. The proposed model offers a high heat transferring capacity and reduces pressure effects risk.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 1","pages":"110 - 142"},"PeriodicalIF":1.3,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140569466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Study of Heat Transfer of Different-Thickness Plate Modules of Heat and Mass Transfer Device 传热传质装置不同厚度板模块的传热实验研究

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2024-04-10 DOI: 10.1134/S1810232824010090

A. V. Stepykin, A. A. Sidyagin, D. M. Bukharov, E. M. Tutanina, D. E. Sukhanov

引用次数: 0

Thermoelectric Properties of BeO and MgO Monolayers from First-Principles Calculations 根据第一原理计算得出的氧化铍和氧化镁单层的热电性能

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2024-04-10 DOI: 10.1134/S1810232824010132

B. J. Abdullah

{"title":"Thermoelectric Properties of BeO and MgO Monolayers from First-Principles Calculations","authors":"B. J. Abdullah","doi":"10.1134/S1810232824010132","DOIUrl":"10.1134/S1810232824010132","url":null,"abstract":"First-principles calculations based on density functional theory were used to examine the thermoelectric characteristics of BeO and MgO monolayers in the current study. The energy gap range of these two monolayers reveals the insulating properties of BeO and the semiconductor properties of MgO which is in agreement with those of the previously reported results. Following the band structure and related structure parameters the BoltzTrap method was used to determine the electronic transport coefficients based on Boltzmann transport theory. Calculations relating to thermoelectric characteristics are found in this perspective, including those relating to the Seebeck coefficient, the electrical conductivity, the electronic thermal conductivity, electron heat capacity, Hall coefficient, magnetic susceptibility, and figure of merit The crystal structure, internal energy, and electronegativity all have an impact on the characteristics of heat transport since there is a possibility of variable atomic diameters and the different in electron localization function. The MgO monolayer has a somewhat higher figure of merit than BeO due to MgO’s higher electron conductivity in comparison to BeO and its lower electron thermal conductivity values. The new findings can provide a fundamental understanding of thermoelectric transport and related applications for both BeO and MgO monolayers.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 1","pages":"186 - 199"},"PeriodicalIF":1.3,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140569334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Diagnostics of Oil Well Pumping Equipment by Using Machine Learning 利用机器学习诊断油井抽油设备

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2024-04-10 DOI: 10.1134/S1810232824010053

S. S. Abdurakipov, M. Dushkin, D. Del’tsov, E. B. Butakov

{"title":"Diagnostics of Oil Well Pumping Equipment by Using Machine Learning","authors":"S. S. Abdurakipov, M. Dushkin, D. Del’tsov, E. B. Butakov","doi":"10.1134/S1810232824010053","DOIUrl":"10.1134/S1810232824010053","url":null,"abstract":"If speaking of timely detection of deviations in operation of pumping equipment, there is a problem of the current coverage of the oil well stock with telemetry sensors. Some data analytics, for example, analysis of dynamograms, is still performed manually. The present work attempts to create an automation solution for diagnostics of the condition of well pumping equipment. For sucker-rod pumps, a dynamogram classification model based on a convolutional neural network has been developed, which makes it possible to identify working conditions of a pumping unit. For electric centrifugal pumps (ECPs), a virtual sensor model has been developed based on modern machine learning technologies, which enables prediction of temperature and pressure gradients at the pump intake in the absence of submersible sensors. In the work, we tested a set of classical machine learning algorithms based on linear models and ensembles of decision trees, as well as advanced deep learning methods, e.g., transformers. The virtual sensor models developed are embedded directly into the automated process control system (APCS), and thus technologists and operators can be warned timely, almost in real time, of a possible shortening of the planned time between failures of ECP units and their possible mailfunctioning for various reasons.","PeriodicalId":627,"journal":{"name":"Journal of Engineering Thermophysics","volume":"33 1","pages":"39 - 54"},"PeriodicalIF":1.3,"publicationDate":"2024-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140569322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On Applicability of IQR Method for Filtering of Experimental Data 论 IQR 方法在实验数据过滤中的适用性

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2024-04-10 DOI: 10.1134/S1810232824010016

B. B. Ilyushin

引用次数: 0

Comparison of Two Numerical Models of Convection in the Earth’s Mantle 两种地球地幔对流数值模型的比较

IF 1.3 4区工程技术

Journal of Engineering Thermophysics Pub Date : 2024-04-10 DOI: 10.1134/S1810232824010041

V. V. Chervov, G. G. Chernykh, I. B. Palymskiy

引用次数: 0