Integral bubble and jet models with pressure forces

Vul'fson, A. N.; Nikolaev, Petr

doi:10.1134/s0001433817040120

Cited by 6 publications

(4 citation statements)

References 19 publications

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“…The air temperature in the vertical shafts of the mine varies both in depth and in cross-section. It depends on the temperature of rocks and atmospheric air on the surface, the amount of air supplied to the bottom-hole space for ventilation, heat dissipation during blasting and operation of equipment, water cut and other factors [14][15][16][17][18]. In this case, the depth of the mine shaft plays a decisive role.…”

Section: Research Resultsmentioning

confidence: 99%

Influence of temperature factor on the speed of strength gain of modified concrete of workings support

2019

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The article analyzes the influence of the temperature of the medium on the speed of strength gain of concrete of workings support. For these purposes, comparative tests of concrete samples at the age of 0.5, 1.0 and 3 days were carried out. As a result of data processing, the dependences of the strength of concrete of support at an early age at different hardening temperatures were obtained. A method for predicting of concrete strength considering the temperature and parameters of the technological cycle of attachment was developed. With this technique, it is possible to more accurately determine the parameters of concreting, reduce the time of Stripping of monolithic support and increase the speed of penetration of workings.

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Section: Research Resultsmentioning

confidence: 99%

Influence of temperature factor on the speed of strength gain of modified concrete of workings support

2019

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“…For simulations of the unstable boundary layer, the inflow potential temperature profile is constant/neutral through the boundary layer with an adiabatic condition at the ground. To compensate for the absence of resolved convections, the model of the unstable boundary layer includes an additional buoyancy production term based on the similarity theory proposed in [9]. Weather Research and Forecasting (WRF) model simulations run over the PPM periods informed the inflow boundary conditions used in the microscale RANS simulations.…”

Section: Numerical Simulationsmentioning

confidence: 99%

The impact of blockage and wakes on seven power performance tests conducted at two wind farms

Bleeg,

Vishwakarma,

Del Hoyo

et al. 2024

J. Phys.: Conf. Ser.

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Blockage and wakes can potentially influence wind turbine power performance measurements (PPM), distorting the measured power curve relative to the true performance of the test turbine. In this study, we take a previously proposed method to correct for the impact of blockage and wakes and test it on seven PPM conducted in simple terrain at two wind farms. Each PPM was completed according to the prevailing standard from the International Electrotechnical Commission. The correction factors derive from Reynolds-Averaged Navier-Stokes simulations of the two wind farms, and we apply these factors to the measured wind speed data on a record-by-record basis. The wind speed corrections clearly reduce variability in the measured power coefficients for the three PPM affected by long-distance wakes. The corrections do not reduce performance variability within the other four PPM. They also do not reduce differences in measured performance between the turbines at each wind farm, though numerical site calibrations do. Given these results, and considering uncertainty in the measurements, including confounding influences like terrain and turbine differences, validation against many more PPM is likely needed to adequately assess the reliability and utility of the correction method.

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“…The inner layer of concrete lining is contacts with atmospheric environment of mine shaft, which corrosive properties are defined by: amplitude attributes, air-flow resistance of frames, temperature and etc. Analysis of these factors can be examined in researches [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Summary fractional rock mass contour line movement before concrete lining setting may be written as[12]: coefficient in accordance with[1]. Value parameter krb determined with numerical model study of bottom shaft zone, which has fixed rock mass layer, width equal rock-bolt length lrb and instantiated of elasticity model…”

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confidence: 99%

Determination of stresses in concrete lining with rock-bolt in case of exhaustion of rock-bolt supporting strength

Плешко

Shornikov

2019

MATEC Web Conf.

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The article deals with the solution of analytical problem of flat axisymmetric elasticity theory, when rock-bolt supporting strength is exhausted. Expression for determination of stresses in concrete lining is deduced, where pressure increasing at exploitation have regarded. This methodology can be used at blueprint stage and preliminary calculation during mining operations. Further evaluation of concrete lining strength and geophysical probe of rock is needed for the preliminary calculation.

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Integral bubble and jet models with pressure forces

Cited by 6 publications

References 19 publications

Influence of temperature factor on the speed of strength gain of modified concrete of workings support

Influence of temperature factor on the speed of strength gain of modified concrete of workings support

The impact of blockage and wakes on seven power performance tests conducted at two wind farms

Determination of stresses in concrete lining with rock-bolt in case of exhaustion of rock-bolt supporting strength

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