Determination of the Internal Combustion Engine Valve Gear Characteristics

Vasilyev, Alexander; Bakhracheva, Yulia

doi:10.1088/1742-6596/1050/1/012094

Cited by 16 publications

(6 citation statements)

References 3 publications

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“…As can be seen from ( 1) and (2), the equations for temperature and moisture content in this case are independent (the relationship between the functions T and U is carried out in this model only through boundary conditions), which makes significant simplifications in the algorithm for studying the process. The equations for complexes (13) under the conditions of our problem can be represented as: Using the Euler method, we find general solutions to these equations that satisfy the condition at infinity (11). They will look like this:…”

Section: An Asymptotic Solution For a Mathematical Model Of Heat And ...mentioning

confidence: 99%

Generalization of the Fourier Problem on Fluctuations in the Temperature of the Earth’s Crust

Afanas’ev

Bakhracheva

2022

J. Phys.: Conf. Ser.

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The problem of asymptotic fluctuations of temperature and moisture content in a half-space is solved by the method of complex amplitudes. The material filling the half-space consists of a solid base (capillary-porous body) and water. The well-known Fourier solution for temperature fluctuations in half-space in the absence of moisture and under the boundary conditions of heat exchange of the first kind is generalized to the case of a wet material under the boundary conditions of Newton for temperature and Dalton for moisture content. The results of the work can be used in geocryology to model seasonal fluctuations in the thermophysical characteristics of frozen rocks and soils.

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Section: An Asymptotic Solution For a Mathematical Model Of Heat And ...mentioning

confidence: 99%

Generalization of the Fourier Problem on Fluctuations in the Temperature of the Earth’s Crust

Afanas’ev

Bakhracheva

2022

J. Phys.: Conf. Ser.

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“…the desired functions will be T(x, t) and U(x, t). The initial boundary value problem for these functions will have the following form [6][7][8]:…”

Section: A Mathematical Model Of the Drying Platementioning

confidence: 99%

“…In these formulas: σthe Stefan-Boltzmann constant; Аthe coefficient of thermal radiation; TB and ψthe temperature and humidity of the air beyond the boundary layer; aw and amthe coefficients of heat and mass exchange of the sample surface with the air medium; P(T)a function that models the dependence of the relative partial pressure of saturated water vapor on its temperature T at General normal pressure; T1=273°C and T2=238°Cconstants. The intensity of heat exchange Q, according to (7), includes heat exchange by convection and heat exchange by radiation, and the intensity of mass exchange J, according to (8), is taken as Dalton's law of evaporation.…”

Section: A Mathematical Model Of the Drying Platementioning

confidence: 99%

Optimization of the plate drying process by electromagnetic radiation using the Green function method

Afanas’ev

Bakhracheva

2021

E3S Web Conf.

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An initial boundary value problem is formulated for calculating the heat-mass-energy fields in a homogeneous wet plate. To solve this problem, an original algorithm containing elements of analytical and numerical methods has been developed. In this method, solutions are written using the spatially one-dimensional Green function of the Neumann problem, which contains eigenvalues and eigenfunctions of the Sturm-Liouville boundary value problem. In comparison with the known numerical algorithms, the problems of the theory of electromagnetic drying for which its application can be effective are indicated. It is shown that the discrete supply of microwave energy significantly reduces the gradients of temperature, steam and moisture content, while reducing energy consumption by 11...12 %. The probability of an undesirable spontaneous temperature increase at the end of the drying cycle is significantly reduced, and the electrical and thermal conditions of the microwave energy source are improved.

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“…In order to select the profile parameters that provide the longest time-section of the valve, mathematical methods of experiment planning were used in the construction of this model. In this regard, it should be assumed that the cam described in [13][14][15][16] is characterized by the highest efficiency for this profiling method and specific source data.…”

Section: Mathematical Modelmentioning

confidence: 99%

Improving the energy efficiency of a piston engine based on the use of a numerical method for forming the laws of motion of gas distribution valves

2021

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The increase in the power, economic and environmental performance of modern internal combustion engines is largely due to the improvement of the system that controls the gas exchange processes. Its characteristics determine the quality of filling and cleaning of the cylinders in various operating modes, the loss of power for gas exchange and, consequently, the indicator and effective indicators of the engine. The issues of mathematical modeling of gas exchange processes in combination with the study and improvement of the gas distribution mechanism are considered. The results of experimental and computational studies of gas exchange of tractor diesel are presented. Reserves for improving the gas exchange and the engine as a whole are identified based on the choice of optimal valve timing phases and valve motion laws. They provide a reduction in the modulus of the average pressure of the pump passages in the range of operating modes by 12 - 14 %, which contributed to a decrease in the specific effective fuel consumption by 1.4 ÷ 2.2 g/kWh. The above allows us to conclude that the use of a generalized step-by-step numerical method for synthesizing the law of motion of a pusher with an upper stand allows us to obtain the maximum efficiency characteristics of the gas distribution in the presence of a number of restrictions.

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Determination of the Internal Combustion Engine Valve Gear Characteristics

Cited by 16 publications

References 3 publications

Generalization of the Fourier Problem on Fluctuations in the Temperature of the Earth’s Crust

Generalization of the Fourier Problem on Fluctuations in the Temperature of the Earth’s Crust

Optimization of the plate drying process by electromagnetic radiation using the Green function method

Improving the energy efficiency of a piston engine based on the use of a numerical method for forming the laws of motion of gas distribution valves

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