Technical Physics最新文献

{"title":"Features of Three-Dimensional Thermal State Modeling of a Rotary Piston Engine","authors":"D. V. Vyalikov,&nbsp;M. I. Stupenkov,&nbsp;A. L. Kozlov","doi":"10.1134/S1063784226700532","DOIUrl":"10.1134/S1063784226700532","url":null,"abstract":"<p>The paper considers the features of three-dimensional modeling of the thermal state of rotary piston engine (RPE) components in Ansys Fluent software. It is shown that a well-developed computational and experimental basis has been established for internal combustion piston engines (ICEs), whereas no unified methodology currently exists for RPEs that accounts for rotor motion and the nonuniform nature of heat transfer. A transient CFD modeling methodology is proposed using user-defined functions, a dynamic computational mesh, the Realizable <i>k</i>–ε turbulence model, the Finite Rate/Eddy Dissipation combustion model, and conjugate heat transfer between the gas, solid, and liquid domains. The methodology provides the pressure, temperature, and gas velocity fields, as well as temperature fields of engine components. Validation against experimental pressure and temperature data confirms the applicability of the proposed approach for engineering assessment of the thermal state and subsequent strength calculations.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 9","pages":"673 - 679"},"PeriodicalIF":0.4,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structured Thermal Representation of a Brushless DC Motor Based on Infrared Image Analysis","authors":"A. V. Zayara,&nbsp;M. B. Kosarich","doi":"10.1134/S1063784226700556","DOIUrl":"10.1134/S1063784226700556","url":null,"abstract":"<p><i>Background</i>. The article proposes a method for forming a structured thermal representation of a brushless DC (BLDC) motor based on analysis of infrared thermograms in three‑dimensional red-green-blue (RGB) space. The relevance of the study is due to the need to increase the reliability of monitoring the technical condition of BLDC engines, which are widely used in the designs of unmanned aerial vehicles. <i>Materials and methods.</i> The paper implements a synthesis of computer vision and statistical analysis methods: clustering of color patterns of thermograms is performed using the KDE and Mean Shift algorithms. Based on the selected clusters, the key color moments are calculated, which make it possible to quantify the thermal state of the critical zones of the engine. <i>Results and conclusions.</i> A methodological scheme for the analysis of thermograms has been developed, including the decomposition of the engine into thermal zones according to the spatial and color criterion and the calculation of color moments as compact numerical features.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 9","pages":"718 - 723"},"PeriodicalIF":0.4,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mathematical Model and Algorithm for Solving a Nonlinear Problem of Diffraction on Magnetic Nanostructures Taking into Account the Exchange Interaction Field","authors":"G. S. Makeeva","doi":"10.1134/S1063784226700544","DOIUrl":"10.1134/S1063784226700544","url":null,"abstract":"<p>A mathematical model based on solving Maxwell’s equations supplemented by the equation of motion of the magnetization vector in a ferromagnet taking into account the exchange interaction in the Landau–Lifshitz form has been constructed for magnetic nanostructures. An iterative computational algorithm for solving a nonlinear diffraction problem for an autonomous block containing magnetic nanoinclusions with virtual Floquet channels on the faces, which is reduced to solving a system of nonlinear algebraic equations, has been developed.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 9","pages":"724 - 728"},"PeriodicalIF":0.4,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhancement of Heat Transfer during Pool Boiling of Distilled Water by Electron-Beam Surface Modification","authors":"M. D. Filippov,&nbsp;A. V. Dedov,&nbsp;I. M. Pavlov,&nbsp;A. P. Sliva,&nbsp;E. I. Gareev,&nbsp;A. V. Belyaev,&nbsp;V. V. Yagov,&nbsp;D. A. Petrukhin","doi":"10.1134/S1063784226601171","DOIUrl":"10.1134/S1063784226601171","url":null,"abstract":"<p>This study presents the results of an experimental investigation of the effect of electron-beam surface modification on heat transfer during nucleate pool boiling of distilled water at atmospheric pressure. The relevance of the research is driven by the need to improve the efficiency of cooling systems operating under high heat flux conditions. Copper surfaces with various microrelief geometries fabricated by electron-beam processing using the Surfi-Sculpt technique were employed as test specimens. Three types of modified surfaces were produced: star-shaped structures generated using both the forward and reverse electron-beam scanning modes, and a surface with a linear structure. Boiling curves and heat transfer coefficient versus heat flux relationships were obtained for all investigated samples. The results demonstrated that electron-beam surface modification significantly enhances boiling heat transfer compared with a smooth copper surface. For all modified specimens, the boiling curves shifted toward lower wall superheats, accompanied by an increase in the heat transfer coefficient and critical heat flux. It was shown that the heat transfer performance is strongly influenced by the geometry of the fabricated microrelief, which affects the density of active nucleation sites as well as the liquid supply and vapor removal mechanisms. The obtained results confirm the potential of electron-beam processing as an effective approach for the development of high-performance boiling heat transfer surfaces.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 9","pages":"680 - 690"},"PeriodicalIF":0.4,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of Electrophysical and Rheological Characteristics of Water–Coal Suspensions","authors":"Y. Tashpolotov,&nbsp;R. E. Asanov,&nbsp;B. Zh. Akmatov","doi":"10.1134/S1063784226700519","DOIUrl":"10.1134/S1063784226700519","url":null,"abstract":"<p>This paper presents a comprehensive study on the influence of coal particle concentration (0–50%) on the electrophysical and thermal-engineering properties of coal–water suspensions (CWS). It was experimentally established that the electrical conductivity (σ) exhibits a sharp increase in the range of 0–10%, followed by saturation at concentrations exceeding 15%. The critical percolation concentration (<i>p</i>_c) was found to be 12%, which is in good agreement with Stauffer’s percolation theory. Combustion efficiency (ղ_comb) reaches its maximum at 10–12%, subsequently declining due to rheological constraints. An optimization model is proposed that accounts for conductivity, combustion efficiency, and hydraulic losses. Based on the findings, a working concentration range of 8–12% is recommended for industrial applications.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 9","pages":"710 - 717"},"PeriodicalIF":0.4,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electron-Beam Controlled TEA-CO2 Laser: Modeling Collision-Induced Current Effects and Power Characteristics","authors":"Sin Hyok Pak,&nbsp;Jong Jin Ro,&nbsp;Kwang Il Pak,&nbsp;Chol Yong Han,&nbsp;Tu Hon Yun","doi":"10.1134/S1063784226600906","DOIUrl":"10.1134/S1063784226600906","url":null,"abstract":"<p>In this paper, a new current equation of main discharge of transversely excited atmospheric (TEA) CO₂ laser is introduced. The current equation is derived in consideration of the effects of electron collision with laser gas molecules on discharge current. Then, the collision-induced current equation is combined with the discharge circuit model and six-temperature model (6TM) to build theoretical model. Dynamic emission process of e-beam controlled TEA-CO₂ laser is simulated using the model. The calculated result is in agreement with the experimental result in [33]. The power characteristics are analyzed for different initial electron densities. As a result, it has been found that there is a critical threshold of initial electron density that influences power characteristics to be deteriorated. The theoretical model can be used in the study of the behavior of gas laser discharge and designing of electron beam controlled TEA-CO₂ laser.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 9","pages":"691 - 700"},"PeriodicalIF":0.4,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mathematical Modeling of Detonation in Spark Ignition Engines","authors":"A. V. Kapustin,&nbsp;V. L. Chumakov,&nbsp;S. N. Devyanin","doi":"10.1134/S1063784226700520","DOIUrl":"10.1134/S1063784226700520","url":null,"abstract":"<p>This article presents the feasibility of mathematical modeling of detonation based on the analysis of a computational model of the thermodynamic cycle of a spark-ignition piston engine. This model approximates the actual cycle and allows for the time-dependent determination of the current cycle pressure and the temperature of the unburned propellant with sufficient accuracy. The model takes into account heat exchange between the combustion zones of the propellant and the combustion chamber walls. The onset of detonation is associated with the moment of self-ignition of the unburned propellant, determined based on the thermodynamic parameters of the unburned propellant and the kinetic mechanism of pre-flame chemical processes in the fuel–air mixture. It is shown that mathematical modeling of the self-ignition mechanism of the unburned portion of the charge in spark-ignition piston internal combustion engines can be performed in the same way as modeling the self-ignition mechanism of the fuel–air mixture under continuous compression in free-flying piston engines. The accuracy of the self-ignition calculation using the cycle model was verified experimentally by indexing at various speeds, with different excess-air (α) and filling (η_<i>v</i>) ratios, and at various mixture temperatures in the intake manifold. The modeling results were verified experimentally using isooctane <i>ON</i>100, a <i>ON</i>60 mixture, and commercial gasolines.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 9","pages":"701 - 709"},"PeriodicalIF":0.4,"publicationDate":"2026-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148856677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical Investigation of Fluidic Thrust Vectoring in an Elliptical Dual-Bell Rocket Nozzle Using Shock Vector Control","authors":"Anis Tcherak,&nbsp;Hakim Kbab,&nbsp;Abdelkrim Haddad,&nbsp;Omar Abada","doi":"10.1134/S1063784226600542","DOIUrl":"10.1134/S1063784226600542","url":null,"abstract":"<p>Fluidic thrust vector control has emerged as an attractive alternative to conventional mechanical vectoring systems in modern rocket propulsion due to its reduced structural complexity, improved reliability, and rapid response capability. In a recent study, the authors proposed a novel elliptical cross-section dual-bell rocket nozzle and demonstrated its aerodynamic performance compared with conventional dual-bell configurations. Building upon that design, the present work investigates the application of fluidic thrust vectoring using the shock vector control (SVC) method in the proposed nozzle configuration. A secondary jet is injected into the divergent section of the nozzle to generate asymmetric shock structures and modify the internal pressure distribution, leading to controlled deflection of the exhaust plume. The three-dimensional compressible Reynolds–Averaged Navier–Stokes equations are solved using a finite-volume approach with the SST <i>k</i>–ω turbulence model to analyze the interaction between the injected jet and the primary supersonic flow. The effects of injection pressure ratio and mass flow rate on shock formation, flow separation, and thrust vector angle are systematically examined. Numerical results show that the injected jet induces a strong asymmetric shock system, producing significant jet deflection and effective thrust vectoring while maintaining acceptable propulsion performance. The findings demonstrate that the combination of the elliptical dual-bell nozzle and shock vector control provides a promising fluidic thrust vectoring mechanism for advanced altitude-adaptive rocket propulsion systems.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 8","pages":"661 - 671"},"PeriodicalIF":0.4,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of Technical Aspect of a Multifunctional Generator of the Absorption Refrigeration Machine in the Air-Conditioning Complex System","authors":"A. A. Sukhikh,&nbsp;K. I. Kuznetsov,&nbsp;E. V. Mereutsa,&nbsp;V. A. Milyutin","doi":"10.1134/S1063784226600785","DOIUrl":"10.1134/S1063784226600785","url":null,"abstract":"<p>This study is aimed at the development and designing of a combined heat exchange installation (generator of an absorption refrigeration machine (AHM)/heat pump condenser) in an air-conditioning complex combining a refrigeration machine, a heat pump, and solar collectors. We propose an original schematic decision ensuring the combination of functioning of the generator, the condenser, and the heat pump in a single complex. Flow diagrams of working regimes of the air-conditioning complex are calculated. The technical aspect of the AHM generator is developed and the method for calculating its thermal and technical characteristic is proposed, which makes it possible to take into account the simultaneously occurring processes of boiling of a dilute lithium bromide solution, steam evaporation, and condensation of superheated freon R600a vapor in a single hydraulic loop of solar collectors and heat pump. This decision allows us to refute traditional multiloop systems in which different working bodies circulate, and the heat-transfer processes are implemented with the help of intermediate devices. As a result, it becomes possible to optimize the mass and size characteristics of the entire complex, to reduce the number of basic devices, and to increase the energy efficiency of the entire air-conditioning system. We propose that one and the same freon R600a (isobutane) be used as the heating agent of the solar power plant, the cooling agent of the heat pump, and the heat-accumulating substance. We report on the results of thermal and checking calculations of the combined heat exchange installation. The sizes of the system and its operation conditions are evaluated; the heat-transfer coefficients, expenditures, and the working parameters of cooling agents as well as the thermal power of the apparatus are determined. The significance of the results lies in the development and formation of the technical aspect of the combined heat exchanger, the proof of its high energy and technological efficiency, and the development of recommendations for its designing in complex systems of centralized air-conditioning.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 8","pages":"597 - 605"},"PeriodicalIF":0.4,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of Chemical Reactions on Fluidic Thrust Vectoring Performance in Dual-Bell Nozzles","authors":"Anis Tcherak,&nbsp;Hakim Kbab,&nbsp;Abdelkrim Haddad","doi":"10.1134/S1063784226600712","DOIUrl":"10.1134/S1063784226600712","url":null,"abstract":"<p>Fluidic thrust vectoring (FTV) has emerged as an effective technique for controlling exhaust flow in propulsion systems, with shock vector control (SVC) representing one of its most efficient implementations. Dual-bell nozzles (DBNs), known for their altitude-compensating capability, provide a promising configuration for integrating such control strategies. However, previous studies of SVC in DBNs have been largely restricted to cold-flow simulations using air, which do not accurately represent the high-temperature, chemically reacting environments encountered in rocket propulsion. To address this limitation, the present study investigates the influence of chemical reactions on SVC performance using the ANSYS Fluent computational fluid dynamics (CFD) solver. A kinetic reaction mechanism for LH₂/LO₂ is employed to account for high-temperature dissociation and recombination processes. The analysis is conducted on a novel subscale DBN geometry designed using an in-house method of characteristics (MoC) code, with the resulting contour validated through CFD simulations. Calculated species molar fractions from CFD are further validated against those obtained using NASA’s chemical equilibrium with applications (CEA) code, showing good agreement. Comparative analyses between cold-flow (air) and reacting-flow (LH₂/LO₂) conditions reveal significant differences in SVC performance, highlighting the critical role of thermodynamic and thermochemical effects on vectoring efficiency. These findings demonstrate that cold-flow assumptions may lead to inaccurate predictions, emphasizing the necessity of incorporating reacting-flow models for realistic assessment and design of SVC systems in DBNs.</p>","PeriodicalId":783,"journal":{"name":"Technical Physics","volume":"71 8","pages":"610 - 633"},"PeriodicalIF":0.4,"publicationDate":"2026-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148752117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}