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Numerical simulation of a laminar-turbulent flow past a swept wing under the action of a blowing or suction source 在吹力或吸力源作用下流经后掠翼的层流-湍流的数值模拟
IF 0.5 4区 工程技术 Q4 ENGINEERING, AEROSPACE Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020057
A. V. Boiko, S. V. Kirilovskiy, T. V. Poplavskaya

A method and results of computing a laminar-turbulent flow past a swept wing under a control action generated by a source of blowing or suction from the model surface are presented. Pioneering results on the influence of three-dimensional blowing and suction sources on stability of the boundary layer on a swept wing and distributions of N-factors of various mechanisms of the laminar-turbulent transition aimed at changing its position are obtained by using the LOTRAN 3 software package.

本文介绍了在由模型表面的吹力或吸力源产生的控制作用下计算掠过机翼的层流-湍流的方法和结果。通过使用 LOTRAN 3 软件包,获得了三维吹气源和吸力源对后掠翼边界层稳定性影响的开创性结果,以及旨在改变其位置的层流-湍流过渡的各种机制的 N 因子分布。
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引用次数: 0
Experimental study of the influence of bubble interaction on their characteristics during transient boiling in a flow of subcooled liquid 过冷液体流中瞬态沸腾时气泡相互作用对其特性影响的实验研究
IF 0.5 4区 工程技术 Q4 ENGINEERING, AEROSPACE Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020100
P. V. Khan, A. A. Levin

The paper presents the experimental results on transient nucleate boiling on the heater surface with rapidly increasing surface temperature. According to the results of high-speed video recording with a frequency of 180 000 frames per second and a spatial resolution of 5.5 urn per pixel, the input data for existing models of heat transfer during nucleate boiling must be refined to take into account the existence of cluster and pulsating bubbles. It has been established that bubbles, interacting through the exchange of momentum, heat and vapor mass, accelerate activation of neighboring vaporization sites, so the clusters of bubbles can form at the initial stage of covering the heater surface with vapor. The main characteristics of single, cluster and pulsating bubbles have been studied for the wall superheating from 0 to 14 K above the temperature of nucleation beginning and flow subcooling from 23 to 103 K.

本文介绍了表面温度快速升高时加热器表面瞬态成核沸腾的实验结果。根据频率为每秒 180 000 帧、空间分辨率为每像素 5.5 urn 的高速视频记录结果,现有的成核沸腾过程传热模型的输入数据必须加以完善,以考虑到团状气泡和脉动气泡的存在。已经证实,气泡通过动量、热量和蒸汽质量的交换相互作用,会加速激活相邻的汽化点,因此在蒸汽覆盖加热器表面的初始阶段就会形成气泡群。在成核开始温度以上 0 至 14 K 的壁面过热和 23 至 103 K 的流动过冷条件下,研究了单个气泡、气泡团和脉动气泡的主要特征。
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引用次数: 0
Increasing the thermal inertia of building walls when using phase change materials 使用相变材料提高建筑墙体的热惯性
IF 0.5 4区 工程技术 Q4 ENGINEERING, AEROSPACE Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020070
M. I. Nizovtsev, A. N. Sterlyagov

The influence of a thin layer of phase change material (PCM) on the thermal characteristics of the outer wall of a building made of lightweight thermal insulation material was studied numerically. Changes in temperature and heat flux density were analyzed for various locations of a PCM layer in the wall. It is shown that the use of a thin paraffin layer 4 mm thick in a wall made of foamed polyurethane 100 mm thick can reduce the amplitude of heat flux fluctuations on the inner surface of the wall in the summer from 2 to 13 times, depending on the PCM location. The greatest reduction is achieved when installing the PCM in the central area of the wall. Calculations show that when using a PCM in the walls of buildings made of light thermal insulation materials, a positive effect, associated with a 6–8 hour delay in the maximum heat flux entering the room relative to the maximum daily value of the outside air temperature, is observed in the summer.

我们用数值方法研究了薄层相变材料 (PCM) 对轻质隔热材料建筑外墙热特性的影响。分析了墙内不同位置的 PCM 层的温度和热流密度变化。结果表明,在 100 毫米厚的发泡聚氨酯墙体中使用 4 毫米厚的薄石蜡层,可将夏季墙体内表面的热通量波动幅度降低 2 至 13 倍,具体取决于 PCM 的位置。将 PCM 安装在墙壁中央区域时,可实现最大的减幅。计算显示,在轻质隔热材料建筑的墙壁中使用 PCM 时,会产生积极的效果,即相对于室外空气温度的日最高值,进入室内的最大热通量会延迟 6-8 小时。
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引用次数: 0
Investigation of the influence of control surfaces and fuselage on the structure of a separated flow around a flying vehicle model with a classical configuration 研究控制面和机身对经典构型飞行器模型周围分离流结构的影响
IF 0.5 4区 工程技术 Q4 ENGINEERING, AEROSPACE Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020082
A. M. Pavlenko, E. A. Melnik, N. S. Alpatsky, B. Yu. Zanin

The paper describes the results of an experimental study of the influence of control surfaces and fuselage on the structure of a separated flow around a model of a small-size unmanned flying vehicle with a straight leading edge of the wing. The use of oil-soot visualization and hot-wire anemometry shows that the separation region location depends on the attitude of control surfaces, while the presence of a fuselage leads to reduction of the critical angle of attack.

本文介绍了控制面和机身对机翼前缘平直的小型无人驾驶飞行器模型周围分离流结构影响的实验研究结果。使用油底可视化和热线风速测量法表明,分离区域的位置取决于控制面的姿态,而机身的存在会导致临界攻角减小。
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引用次数: 0
Steady and unsteady numerical investigation of mixed convective heat transfer enhancement in a channel with baffles attached to the heated wall 带加热壁挡板的通道中混合对流传热增强的稳定和非稳定数值研究
IF 0.5 4区 工程技术 Q4 ENGINEERING, AEROSPACE Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020069
H. Toumi, R. Henniche, A. Korichi

Numerical computation of aiding mixed convection and heat transfer characteristics in a channel with a baffled heated wall is carried out in this work. The equations of mass, momentum and energy, alongside the boundary conditions, are solved by the finite volume formulation using the open source OpenFOAM® code. Simulations are accomplished under different parameter combinations, including the Reynolds number, Grashof number, and baffle dimension. The results are presented in terms of streamlines, isotherm contours, Nusselt number, and friction factor. The results obtained revealed that the flow translates from steady to unsteady state at a relatively low value of Reynolds number. The unsteady flow behaviour contributes to improve heat transfer by disturbing the near-wall region. The augmentation of velocity and baffle dimension leads to a notable heat transfer enhancement; however, this enhancement is less sensitive to the heating intensity augmentation.

本研究对带有挡板加热壁的通道中的辅助混合对流和传热特性进行了数值计算。质量、动量和能量方程以及边界条件均通过有限体积公式使用开源 OpenFOAM® 代码求解。模拟在不同的参数组合下完成,包括雷诺数、格拉肖夫数和挡板尺寸。模拟结果以流线、等温线、努塞尔特数和摩擦因数的形式呈现。研究结果表明,在雷诺数相对较低的情况下,流动就会从稳定状态转变为不稳定状态。非稳态流动行为通过扰动近壁区域来改善传热。速度和挡板尺寸的增加显著提高了传热效果,但这种提高对加热强度的增加不太敏感。
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引用次数: 0
On the influence of multi-walled carbon nanotube additives on the rheology of hydrocarbon-based drilling fluids 多壁碳纳米管添加剂对碳氢化合物基钻井液流变性的影响
IF 0.5 4区 工程技术 Q4 ENGINEERING, AEROSPACE Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020148
E. I. Lysakova, A. D. Skorobogatova, A. L. Neverov, M. I. Pryazhnikov, A. V. Minakov

The paper presents the results of experimental studies on the effect of multi-walled carbon nanotubes (MWCNTs) additives on the viscosity and rheological characteristics of drilling emulsions based on mineral oil. The formulations of typical drilling fluids containing 65% hydrocarbon phase were modified with nanotubes. The mass concentration of nanotubes in emulsion varied from 0.1 to 0.5%. The formulation and method of preparing stable drilling emulsions with MWCNT additives have been proposed. The rheology of drilling emulsions modified with MWCNTs was studied. The dependency of rheological characteristics on the nanotubes concentration was obtained. In general, MWCNT additives can significantly alter the rheological characteristics of drilling hydrocarbon emulsions at lower concentrations compared to the additives in the form of spherical nanoparticles. This is very important for their practical use in industry. The optimal concentration of MWCNTs for controlling the rheological properties of drilling emulsions is about 0.25 wt. %.

本文介绍了多壁碳纳米管(MWCNTs)添加剂对基于矿物油的钻井乳液的粘度和流变特性的影响的实验研究结果。对含有 65% 碳氢化合物相的典型钻井液配方进行了纳米管改性。纳米管在乳液中的质量浓度从 0.1%到 0.5%不等。提出了使用 MWCNT 添加剂制备稳定钻井乳化液的配方和方法。研究了用 MWCNTs 改性的钻井乳化液的流变特性。得出了流变特性与纳米管浓度的关系。总体而言,与球形纳米颗粒形式的添加剂相比,MWCNT 添加剂在较低浓度下就能显著改变钻井碳氢化合物乳化液的流变特性。这对它们在工业中的实际应用非常重要。控制钻井乳液流变特性的最佳 MWCNT 浓度约为 0.25 wt.%。
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引用次数: 0
Analysis of superheated steam influence on the content of solid carbon particles during diffusion combustion of liquid hydrocarbon fuel 过热蒸汽对液态碳氢化合物燃料扩散燃烧过程中固体碳颗粒含量的影响分析
IF 0.5 4区 工程技术 Q4 ENGINEERING, AEROSPACE Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020136
E. P. Kopyev

The study is aimed at clarifying and revealing the basic principles of the effect of superheated steam and its parameters on the content of solid carbon particles (soot) in intermediate and final combustion products when burning liquid hydrocarbon fuel. Using a laboratory atmospheric atomizing burner, it was determined that there is a significant amount of solid carbon particles at the base of the burner flame. When heated air is used instead of steam, an increase in soot content by ∼75 % is observed. The analysis of the flame glow intensity in a narrow ultraviolet band also showed that in air the glow values are ∼75 % higher than when using superheated steam. At the same time, it has been established that the soot content in the final combustion products is affected only by the parameter of the dynamic effect of a jet, which determines air ejection from the environment both into the gas generation chamber and into the external flame region.

这项研究旨在阐明和揭示过热蒸汽及其参数对燃烧液态碳氢化合物燃料时中间和最终燃烧产物中固体碳颗粒(烟尘)含量影响的基本原理。通过使用实验室大气雾化燃烧器,可以确定在燃烧器火焰底部存在大量固体碳颗粒。当使用加热的空气代替蒸汽时,观察到烟尘含量增加了 ∼ 75 %。对窄紫外波段火焰辉光强度的分析也表明,在空气中,辉光值比使用过热蒸汽时高出 ∼ 75 %。同时还确定,最终燃烧产物中的烟尘含量仅受喷射动态效应参数的影响,该参数决定了空气从环境中喷射到气体发生室和外部火焰区域。
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引用次数: 0
Modeling the thermophysical characteristics of polymer composites in the curing process 聚合物复合材料在固化过程中的热物理特性建模
IF 0.5 4区 工程技术 Q4 ENGINEERING, AEROSPACE Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020124
O. S. Dmitriev, A. A. Barsukov, D. Ya. Barinov

Constructing models of thermophysical characteristics of polymer composite materials in the curing process is a highly pressing task that is substantiated in this paper. A mathematical model of hot curing of polymer composites based on a thermosetting resin in a mold is presented. Based on experimental temperature dependences of thermophysical characteristics measured under different conditions, modeling dependences of the volume heat capacity and thermal conductivity of fiber, fabric and granular polymer composites on the degree of cure and resin fraction during curing are obtained, with their distinctive feature being the replacement of the properties of a porous reinforcing filler with those of the cured resin in the model. The results of experiments and calculations are presented. The proposed models of thermophysical characteristics increase the accuracy of process modeling and calculation of optimal temperature-time curing cycles.

建立聚合物复合材料在固化过程中的热物理特性模型是一项非常紧迫的任务,本文对此进行了论证。本文介绍了基于热固性树脂的聚合物复合材料在模具中热固化的数学模型。根据在不同条件下测得的热物理特性的实验温度相关性,得到了纤维、织物和颗粒聚合物复合材料的体积热容和导热系数与固化程度和固化过程中树脂组分的模型相关性,其显著特点是在模型中用固化树脂的特性替代了多孔增强填料的特性。实验和计算结果均已公布。所提出的热物理特性模型提高了工艺建模和最佳温度-时间固化周期计算的准确性。
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引用次数: 0
Study of helium permeability for silica microspheres 二氧化硅微球的氦渗透性研究
IF 0.5 4区 工程技术 Q4 ENGINEERING, AEROSPACE Pub Date : 2024-10-17 DOI: 10.1134/S0869864324020112
M. V. Frolov, A. S. Vereshchagin, I. V. Kazanin

This paper presents the study of permeability of helium through walls of hollow glass silica microspheres, which can be used as membranes for gas flow. The study was performed in a special setup for measuring the kinetic sorption curves for helium at given pressure and temperature. A mathematical model based on a mono-dispersion distribution was used for approximating the experimental data. The data was obtained for the temperature range 21.5–110.0 °C. The helium permeability of microsphere walls and the activation energy for helium sorption by microspheres were defined for this temperature range.

本文研究了氦气通过空心玻璃硅微球壁的渗透性,这种微球可用作气体流动膜。研究是在一个特殊装置中进行的,该装置用于测量氦气在给定压力和温度下的动力学吸附曲线。使用基于单分散分布的数学模型来逼近实验数据。获得的数据温度范围为 21.5-110.0 °C。在此温度范围内,确定了微球壁的氦渗透率和微球吸附氦的活化能。
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引用次数: 0
Modification of the DSMC method for a macroscopic chemical reaction 修改宏观化学反应的 DSMC 方法
IF 0.5 4区 工程技术 Q4 ENGINEERING, AEROSPACE Pub Date : 2024-10-17 DOI: 10.1134/S086986432402015X
R. Zakeri, R. Kamali-Moghadam, M. Mani

Considering some limitations of various macroscopic chemical reaction models including the total collision energy (TCE) and general collision energy (GCE) models, the new modification is implemented in the DSMC algorithm for numerical simulation of dissociation of the air along the stagnation line and around a typical hypersonic atmospheric blunt body, STS-2 in un-equilibrium conditions and modified model is compared with others conventional models. Since the TCE and GCE models are dependent on some experimental parameters (A and B in the Arrhenius equation for the reaction rate), also, due to the lack of accuracy of the QK model, modification version of chemical reaction models is presented as a hybrid of modified quantum kinetics (MQK) and modified collision energy (MCE) which this method is able to extract A and B parameters without need of experimental background. The accuracy of the current applied chemical model for the calculation of flow field characteristics is assessed by comparison of their results with other methods (analytical models and available experimental data). The results indicate that the modification of hybrid model with advantages of the independency of the empirical parameters gives more accurate results and provides more accurate solution compared to conventional methods without need of A and B constant experimental parameters.

考虑到包括总碰撞能(TCE)和一般碰撞能(GCE)模型在内的各种宏观化学反应模型的一些局限性,在 DSMC 算法中实施了新的修改,用于在非平衡条件下对沿停滞线和围绕典型高超音速大气钝体 STS-2 的空气解离进行数值模拟,并将修改后的模型与其他传统模型进行了比较。由于 TCE 和 GCE 模型依赖于一些实验参数(反应速率阿伦尼乌斯方程中的 A 和 B),同时由于 QK 模型缺乏准确性,因此提出了化学反应模型的修正版本,即修正量子动力学(MQK)和修正碰撞能(MCE)的混合模型,该方法无需实验背景即可提取 A 和 B 参数。通过与其他方法(分析模型和现有实验数据)的结果比较,评估了当前用于计算流场特征的化学模型的准确性。结果表明,与不需要 A 和 B 恒定实验参数的传统方法相比,具有经验参数独立优势的混合模型的修改结果更准确,并提供了更精确的解决方案。
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引用次数: 0
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Thermophysics and Aeromechanics
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