scholarly journals Numerical Simulation of Intrachamber Processes in the Power Plant

2021 ◽  
Vol 11 (11) ◽  
pp. 4990
Author(s):  
Boris Benderskiy ◽  
Peter Frankovský ◽  
Alena Chernova
Keyword(s):  
Numerical Simulation ◽  
Power Plant ◽  
Flow Structure ◽  
Power Plants ◽  
Control Volume ◽  
Conjugate Problem ◽  
Topological Features ◽  
Gas Dynamic ◽  
Calculation Results ◽  
Volume Method

This paper considers the issues of numerical modeling of nonstationary spatial gas dynamics in the pre-nozzle volume of the combustion chamber of a power plant with a cylindrical slot channel at the power plant of the mass supply surface. The numerical simulation for spatial objects is based on the solution conjugate problem of heat exchange by the control volume method in the open integrated platform for numerical simulation of continuum mechanics problems (openFoam). The calculation results for gas-dynamic and thermal processes in the power plant with a four-nozzle cover are presented. The analysis of gas-dynamic parameters and thermal flows near the nozzle cover, depending on the canal geometry, is given. The topological features of the flow structure and thermophysical parameters near the nozzle cap were studied. For the first time, the transformation of topological features of the flow structure in the pre-nozzle volume at changes in the mass channel’s geometry is revealed, described, and analyzed. The dependence of the Nusselt number in the central point of stagnation on the time of the power plants operation is revealed.

scholarly journals The use of organic zeotropic mixture with high temperature glide as a working fluid in medium-temperature vapor power plant

2017 ◽  
Vol 21 (2) ◽  
pp. 1153-1160 ◽  
Author(s):  
Aleksandra Borsukiewicz
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Electrical Energy ◽  
Hot Water ◽  
Working Fluid ◽  
Large Temperature ◽  
Medium Temperature ◽  
Calculation Results ◽  
Zeotropic Mixture ◽  
Selection Of

The paper presents the idea of using organic substances as working fluids in vapor power plants, in order to convert the low and medium temperature thermal energy sources into electrical energy. The calculation results of the power plant efficiency for butane-ethane zeotropic mixtures of different mass compositions, for the power plant supplied with hot water having a temperature of 120?C. Based on the results of thermal-flow calculations it was found that the use of zeotropic mixture does not allow to increase the efficiency and output of the power plant (these values appeared as slightly lower ones). However, it was found that, through the selection of a mixture of sufficiently large temperature glide, the heat exchange surface of the condenser can be reduced or a co-generation system can be implemented.

Analysis of temporal and spatial temperature gradients at pronouncedly fluctuating cooling conditions

2004 ◽  
Vol 120 ◽  
pp. 529-535
Author(s):  
A. Galović ◽  
M. Andrassy ◽  
S. Mudrinić
Keyword(s):  
Control Volume ◽  
High Sensitivity ◽  
Cooling Capacity ◽  
Temperature Changes ◽  
Probe Diameter ◽  
Cooling Conditions ◽  
Calculation Results ◽  
Volume Method ◽  
Cooling Velocity ◽  
Very High

Realised cooling velocities of a probe (cylinder) at discrete radius points during cooling at pronouncedly fluctuating cooling conditions are presented. Submerging the probe into an air-corundum (Al2O3) particles fluidised system of insufficient cooling capacity imposes the fluctuating cooling conditions. The particles have an average granulation of 95 m; the cylindrical probe diameter is 50 mm and its height 175 mm. The probe surface temperature and the temperature 1.5 mm beneath its surface are measured with built-in thermocouples. The thermocouples have a very high sensitivity, which enables temperature variation recording according to the cooling dynamics. The relevant cooling time is 125 seconds. The temperature changes in discrete points of the cylinder radius are determined by the control volume method. The calculation results indicate a shift of the maximum cooling velocity towards the interior of the cylinder.

Analysis of Flow in Power Plant Flue via Fluent Simulations

2013 ◽  
Vol 838-841 ◽  
pp. 2630-2633
Author(s):  
Guan Yi Chen ◽  
Guo Dong Yuan ◽  
Le Yu Zheng ◽  
Xiao Ke Guo ◽  
An Long Lv ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Power Plant ◽  
Gas Flow ◽  
Electrostatic Precipitator ◽  
Pressure Drops ◽  
Calculation Results ◽  
Fluent Software ◽  
Simulation Results ◽  
Supporting Structures ◽  
Main Factor

The gas flow status including velocity and pressure in the rectangular gas duct (before or after) electrostatic precipitator of a power plant were simulated using Fluent software. The grid accuracy which is required by simulation has been determined then the gas flow status has been analyzed through the comparison between numerical simulation results and empirical calculation results. The results show that flues inner supporting structures are the main factor of gas pressure drops and outlet velocity distrubution.

Numerical Simulation on Fouling of the Steam Cooler in a Power Plant

2013 ◽  
Vol 291-294 ◽  
pp. 1969-1974
Author(s):  
Wei Liang Cheng ◽  
An Di ◽  
Li Chao Liu ◽  
Lian Guang Liu
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Exchange ◽  
Power Plant ◽  
Power Plants ◽  
Engineering Application ◽  
Flow State ◽  
Equipment Safety ◽  
Heat Exchange Tube ◽  
Reasonable Model

The fouling in the heat transfer devices of power plants, not only changes the fluid flow state designed, but also counteracts the heat transfer, so the equipment safety and economy are reduced. The adsorption and deposition about fouling is a quite complicated chemical and physical process, and it is difficult to obtain an accurate and reasonable model and its engineering application. Therefore, under some different conditions such as velocity, temperature and concentration of fouling and pipe position, the numerical simulation is obtained in the power plant steam cooler. The temperature inside the pipe is gradually decreased with the velocity. At the same time, the fouling increases in the first half of the exchanger pipe, and easily appears near regions of entrance more and more. The fouling may occurs at the outlet position of the heat exchange tube. Under the same conditions the heat exchange tube near centre line is easier to bring the fouling.

scholarly journals Numerical simulation of hydrodynamic loads on starting rocket and submarine

2016 ◽  
pp. 30-35 ◽  
Author(s):  
V. I. Pegov ◽  
I. Yu. Moshkin ◽  
E. S. Merkulov ◽  
A. D. Cheshko
Keyword(s):  
Numerical Simulation ◽  
Phase State ◽  
Control Volume ◽  
Three Dimensional ◽  
Stationary Problem ◽  
Problem Statement ◽  
Two Phase ◽  
Hydrodynamic Loads ◽  
Simulation Based ◽  
Volume Method

The paper proposes a solution to the problem of determining hydrodynamic loads on the rocket and submarine using numerical simulation based on the control volume method in a three-dimensional non-stationary problem statement. We took into consideration contours, rocket and submarine velocity, medium two-phase state (gas liquid), viscosity and gravity. We calculated the start effects on the rocket and submarine for two cases: when the submarine is moving and stationary. The reliability and accuracy of the calculations were confirmed by comparing them with the results of the tests on a model in the hydro tank at JSC Academician V. P. Makeyev State Rocket Centre.

scholarly journals Analisa Efisiensi Termal Turbin, Kondensor dan Menara Pendingin pada Pembangkit Listrik Tenaga Panas Bumi

2020 ◽  
Vol 10 (1) ◽  
pp. 05-12
Author(s):  
Clinton Sihombing ◽  
Keyword(s):  
Power Plant ◽  
Thermal Efficiency ◽  
Nuclear Power ◽  
Power Plants ◽  
Cooling Tower ◽  
Geothermal Fluid ◽  
Turbine Condenser ◽  
Calculation Results ◽  
Geothermal Power ◽  
Pass Through

Geothermal power plants have similarities with other generated power plants such as coal, gas or nuclear power that is converting heat energy into electricity. When the geothermal fluid is extracted from the production well, it will pass through many different processes or equipment on the way to the power plant. During this process the geothermal fluid loses unused energy to generate power. The overall efficiency of the power plant can be affected by several parameters, one of them is design of power plant. This study attempts to analysis the thermal efficiency of the generating components: turbine, condenser and cooling tower at one of geothermal power plant in Indonesia. So, we can know how the performance of the component, whether the component is running well or not. From the calculation results obtained that the turbine, condenser and cooling tower currently still operate well with the value of thermal efficiency of 80%-100%.

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