Computational and Experimental Method for Assessing the Thermal Strength of High-Loaded Diesel Engines

Belov, V. P.; Apelinskiy, D. V

doi:10.1088/1742-6596/2096/1/012204

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…( 4), m represents the mass of the battery. The experimental power battery heat generation method uses a square iron-shell lithium iron phosphate power battery 26 with a capacity of 20Ah. The testing procedure can be described as follows.…”

Section: Theory Of Battery Heat Productionmentioning

confidence: 99%

Application of power battery under thermal conductive silica gel plate in new energy vehicles

Ma,

Zong,

Wan

et al. 2024

Sci Rep

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This study aims to improve the performance of automotive battery thermal management systems (BTMS) to achieve more efficient heat dissipation and thus reduce hazards during driving. Firstly, the research parameters and properties of composite thermally conductive silicone materials are introduced. Secondly, the heating principle of the power battery, the structure and working principle of the new energy vehicle battery, and the related thermal management scheme are discussed. Finally, the research results are presented from the experimental test and controller design. In addition, to achieve the research goal, the composite thermally conductive silica gel plate (CSGP) material is studied in detail and parametrically analyzed, and the heating mechanism of the power battery is discussed in depth. The temperature characteristics after adding CSGP are experimentally tested, and the controller of the BTMS of the new energy vehicle is designed, including hardware circuits and software modules. The findings show that the temperature characteristics of the battery module have obvious limitations without CSGP. When the battery module operates at a 4C magnification, the temperature exceeds the safety threshold by 38.4%, with particular potential safety risks. Then, the maximum temperature of the battery module with CSGP can be controlled within 50 °C, and the temperature characteristics are prominently improved. Lastly, the controller of the BTMS is tested, and the results reveal that it has remarkable voltage recovery ability. According to the research results, the performance of automotive BTMS can be significantly improved, and better heat dissipation can be effectively achieved by adding CSGP. This helps reduce the hazards of driving. Moreover, the designed controller performs well in voltage recovery, providing solid theoretical support for further developing the CSGP battery management system.

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Section: Theory Of Battery Heat Productionmentioning

confidence: 99%

Application of power battery under thermal conductive silica gel plate in new energy vehicles

Ma,

Zong,

Wan

et al. 2024

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Если не учитывать такие факторы, как появление в поршнях случайных производственно-технологических дефектов или воздействие на них эксплуатационных нарушений, то к основным причинам образования трещин следует отнести [3,12]: • низкочастотные колебания температур в поршне, вызванные сменой режимов работы дизеля; • высокочастотные температурные колебания в поверхностном слое поршня КС в течение рабочего цикла; • высокочастотные механические напряжения, обусловленные переменными силами давления газов в течение рабочего цикла. По сведениям многочисленных авторов [3,5,10], превалирующими напряжениями с точки зрения появления трещин на кромке КС являются низкочастотные температурные напряжения, вызванные резкими сменами наброса и сброса нагрузки.…”

Section: теория конструирование испытанияunclassified

Experimental assessment of the temperature state of tractor diesel pistons

Belov

Apelinskiy

Bezhenar

2022

Traktory i sel hozmashiny

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INTRODUCTION: The paper presents the operating conditions of tractor diesel engines that cause the appearance of thermal fatigue cracks on the edges of the piston combustion chamber. The presence of sharp edges of the combustion chamber in the pistons, which are stress concentrators, leads to an increase in the probability of their destruction and thereby limits the engine life of the diesel engine. The main reasons for the formation of cracks in the zone of the edge of the combustion chamber are indicated. AIMS: The aim of this study is the assessment of the temperature state of pistons of the D-240 and the D-245 tractor diesel engines, produced by Minsk Motor Plant (MMP). METHODS: Temperature gauging was carried out according to the method in order to identify the nature of changing of piston heads temperatures under stationary and nonstationary operation modes of diesel engines. Transfering of thermal electromotive force from thermocouples to measuring devices was carried out by means of an intermittent current collector. Imitaion of nonstationary operation modes was carried out by means of changing the cyclic feed of a high pressure fuel pump, using a reversible electric motor. RESULTS: The data of the temperature state of pistons under various stationary and nonstationary operation modes of engines is provided. It is noted that the temperature state of the D-245 diesel pistons has a higher level of heat stress compared to the D-240 diesel pistons. The maximum amplitude of low-frequency temperature fluctuations at the edge of the combustion chamber and their radial differences along the piston bottom are determined, depending on the parameters of thermal loading cycles. It is noted that the most dangerous modes of diesel operation, in terms of the destruction of the edge of the combustion chamber, are sharply changing modes (eg.: theloading unloading mode). CONCLUSIONS: It is proposed to increase the fuel injection advance angle in the thermal loading cycle in order to conduct accelerated comparative tests of piston variants for thermal resistance. The developed thermal loading cycle, in which the total duration of the load increase is 180 s and the total duration of the load decrease is 90 s, can be recommended for accelerated motor tests of pistons for thermal cycling resistance. The obtained temperature measurement data is recommended to clarify boundary conditions of the first kind when calculating the piston using the FEM method.

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Influence of heat-protective coatings on the temperature state of tractor diesel pistons

Belov

Apelinskiy²,

Bezhenar³

2023

Izvestiya MGTU MAMI

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BACKGROUND: The paper presents the results of thermometry of pistons with the TsNIDI type combustion chamber (CC) of the D-240 and the D-245 tractor diesel engines. Various constructive and technological measures aimed at increasing the thermal resistance of pistons are considered. AIMS: To evaluate the effect of heat-protective coatings on the temperature state of pistons with the TsNIDI type combustion chamber. METHODS: Motor bench tests of the D-240 and the D-245 diesel engines, equipped with pistons with heat-protective coatings (HPC) on the bottom, were carried out. In the process of research, the influence of the HPC on the thermal state of the pistons as well as on the power and economic indicators of these diesel engines was studied. RESULTS: It is established that hard anodizing leads to a slight decrease in temperatures and their differences at characteristic points of the piston in stationary and non-stationary diesel operation modes. It is noted that the slow rise in temperature at the bottom of the piston is caused by a decrease in the amount of heat supplied to it due to the low thermal conductivity of the oxide layer. It is shown that the PN85Yu15 gas-plasma coating leads to a significant decrease in temperatures and their differences along the piston bottom. It is determined that this coating helps to reduce the specific effective fuel consumption due to the reduction of the ignition delay period in the combustion process. It is noted that a slower growth rate of temperatures and their differences, especially in the zone of the edge of the CC, should reduce the magnitude of thermal stresses, and therefore increase the thermal resistance of the experimental pistons. CONCLUSIONS: It is revealed that the most effective way to reduce the heat stress of the piston is the application of heat-protective coatings on its bottom. The influence of the abovementioned coatings on the nature of the temperature distribution and their differences in the piston head is investigated.

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Computational and Experimental Method for Assessing the Thermal Strength of High-Loaded Diesel Engines

Cited by 3 publications

References 3 publications

Application of power battery under thermal conductive silica gel plate in new energy vehicles

Application of power battery under thermal conductive silica gel plate in new energy vehicles

Experimental assessment of the temperature state of tractor diesel pistons

Influence of heat-protective coatings on the temperature state of tractor diesel pistons

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