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Online since: October 2011
Authors: Yuan Zheng, Dun Zhang, Ying Zhao, Jian Jun Huang
The steady flow data simulated with the standard k-ε model was used as the initial conditions for the unsteady simulation.
These five, the fluid in the wheel region is rotating, thus to distinguish it from other regions, the wheel and guide vanes, the transfer surfaces of runner and draft tube are set to be interface, and to ensure the data transmission in the movement area.
Before the large eddy simulation, the standard k-ε model was used for the steady simulation, and the flow data upon steady simulation with will be as the initial conditions for the unsteady simulation.
With the height reduction, the pressure is elevation on the low tube pressure center, and gradually disappears in the surrounding flow field.
These five, the fluid in the wheel region is rotating, thus to distinguish it from other regions, the wheel and guide vanes, the transfer surfaces of runner and draft tube are set to be interface, and to ensure the data transmission in the movement area.
Before the large eddy simulation, the standard k-ε model was used for the steady simulation, and the flow data upon steady simulation with will be as the initial conditions for the unsteady simulation.
With the height reduction, the pressure is elevation on the low tube pressure center, and gradually disappears in the surrounding flow field.
Online since: July 2008
Authors: J.F. Durodola, Luis Héctor Hernández-Gómez, G. Urriolagoitia-Calderón, A. Luna Avilés, G. Urriolagoitia-Sosa
All the input data was classified
in three groups.
The first five natural frequencies were the input data.
This synthetic data was obtained with the Finite Element Method.
This data was classified in three groups.
In this case, the validation of the data is important.
The first five natural frequencies were the input data.
This synthetic data was obtained with the Finite Element Method.
This data was classified in three groups.
In this case, the validation of the data is important.
Online since: February 2012
Authors: Lian Xu Wang, Da Wei Qu, Chang Qing Song, Ye Tian
Comparison of experimental data and simulation data is shown in Table 3.
Comparison of experimental data and simulation data Rotate speed /[rpm] Data resource Torque /[N·m] Intake most flow /[kg/h] Intake gas pressure /[kPa] BSFC /[g/kw·h] Pressure rario /[-] 2400 Experiment 239.6 247 212.7 205.1 2.108 Simulation 242.2 260.4 208.8 202.9 2.100 1000 Experiment 140.5 64 117.8 243.8 1.175 Simulation 141.0 61 114.6 234.7 1.136 4000 Experiment 192.8 440 225.8 254.9 2.238 Simulation 206.8 439.7 233.4 232.7 2.378 Optimizing The Compression Ratio Firstly it’s noted that all the operation conditions we simulated are full-load in this paper.
Finally the overlap angle is determined as 35 degrees namely that IVO is 12 degrees and EVC is 23 degrees by comparing experimental data at 35 degrees and 25 degrees overlap angle.
The research includes as follows: Combustion parameters about single Vibe model are calculated by BURN function according to the advance experimental data.
And then the simulation data is validated by comparing to the test data.
Comparison of experimental data and simulation data Rotate speed /[rpm] Data resource Torque /[N·m] Intake most flow /[kg/h] Intake gas pressure /[kPa] BSFC /[g/kw·h] Pressure rario /[-] 2400 Experiment 239.6 247 212.7 205.1 2.108 Simulation 242.2 260.4 208.8 202.9 2.100 1000 Experiment 140.5 64 117.8 243.8 1.175 Simulation 141.0 61 114.6 234.7 1.136 4000 Experiment 192.8 440 225.8 254.9 2.238 Simulation 206.8 439.7 233.4 232.7 2.378 Optimizing The Compression Ratio Firstly it’s noted that all the operation conditions we simulated are full-load in this paper.
Finally the overlap angle is determined as 35 degrees namely that IVO is 12 degrees and EVC is 23 degrees by comparing experimental data at 35 degrees and 25 degrees overlap angle.
The research includes as follows: Combustion parameters about single Vibe model are calculated by BURN function according to the advance experimental data.
And then the simulation data is validated by comparing to the test data.
Online since: August 2014
Authors: Wei Xiong, Shi Wei Su, Yu Zou
And on the basis of the step tariff of electricity implementation project of Hubei province data, combined with the local consumption were analyzed, and for the further development of step tariff and the price offer certain reference basis in the future.
Power demand side management, as a kind of energy management, to improve the efficiency of electricity, reduce the installed capacity, scientific power to achieve energy conservation and emissions reduction effect is obvious.
Implementation of data Classification basic power consumption power consumption A power consumption B Sever A 150 151-270 271- Sever B 180 181-400 401- Sever C 130 131-250 251- In accordance with figure 1 when comparing two get judgment matrix, residents in the basic demand of this factor in the executive component is more important.
Single sort results 0.71 0.14 0.14 Sever A 0.29 0.29 0.29 0.2871 Sever B 0.61 0.1 0.1 0.461 Sever C 0.1 0.61 0.61 0.2418 By data, B accounts for absolute advantage, plan A slightly wins C.
Power demand side management, as a kind of energy management, to improve the efficiency of electricity, reduce the installed capacity, scientific power to achieve energy conservation and emissions reduction effect is obvious.
Implementation of data Classification basic power consumption power consumption A power consumption B Sever A 150 151-270 271- Sever B 180 181-400 401- Sever C 130 131-250 251- In accordance with figure 1 when comparing two get judgment matrix, residents in the basic demand of this factor in the executive component is more important.
Single sort results 0.71 0.14 0.14 Sever A 0.29 0.29 0.29 0.2871 Sever B 0.61 0.1 0.1 0.461 Sever C 0.1 0.61 0.61 0.2418 By data, B accounts for absolute advantage, plan A slightly wins C.
Online since: June 2017
Authors: Han Kui Wang, Bin An Shou, Xue Tao Zhang, Ming Song, Jing Xiang, Tong Xu
In this paper, the whole test technique about the permeability of graphite was discussed, including the computational derivations, design of the test equipment, the test procedure and the result data processing.
In this study, the characteristic and test method on the coefficient of permeability of impregnated graphite are discussed including the computational derivations, design of the test equipment, the test procedure and the result data processing.
So in this paper, the interval with the slop reduction no more than 10 percent from start point is defined for the permeability calculation.
(a) (b) (c) Fig.5 (a) permeability of graphite tubes with outer diameter of 50 mm; (b) permeability of graphite tubes with outer diameter of 30 mm; (c) Statistic on the permeability of graphite tubes with the tube volume Summary The permeability test method of the material for graphite pressure vessel was discussed from the computational derivations, the design of test equipment, the test procedure and the result data processing.
In this study, the characteristic and test method on the coefficient of permeability of impregnated graphite are discussed including the computational derivations, design of the test equipment, the test procedure and the result data processing.
So in this paper, the interval with the slop reduction no more than 10 percent from start point is defined for the permeability calculation.
(a) (b) (c) Fig.5 (a) permeability of graphite tubes with outer diameter of 50 mm; (b) permeability of graphite tubes with outer diameter of 30 mm; (c) Statistic on the permeability of graphite tubes with the tube volume Summary The permeability test method of the material for graphite pressure vessel was discussed from the computational derivations, the design of test equipment, the test procedure and the result data processing.
Online since: June 2015
Authors: Wan Azelee Wan Abu Bakar, Nurasmat Mohd Shukri, Jafariah Jaafar, Zaiton Abdul Majid
Data indicated that the optimal content of ammoniated polyethylene glycol in crude B was 1500 mg/L, and PEG with molecular weight of 2000 was the most promising co-solvent with the reagent/oil ratio being 0.4:1 (wt/wt).
Figure 3.4: Effect of reaction temperature towards the reduction of NA in crude oil Influence of stirring time on the deacidification reaction.
Figure 3.5: Effect of stirring time towards the reduction of NA in crude oil Conclusion The acidity in crude oil B was successfully reduced to 0.28 which is less than TAN value of 1 by deacidification reaction of the crude with the ammonia solution in polyethylene glycol at 1500 mg/L.
Figure 3.4: Effect of reaction temperature towards the reduction of NA in crude oil Influence of stirring time on the deacidification reaction.
Figure 3.5: Effect of stirring time towards the reduction of NA in crude oil Conclusion The acidity in crude oil B was successfully reduced to 0.28 which is less than TAN value of 1 by deacidification reaction of the crude with the ammonia solution in polyethylene glycol at 1500 mg/L.
Online since: May 2012
Authors: Zhi Hua Li, Xiao Zu Su
And the formula for short-time stiffness specified in the code for design of concrete (GB50010-2010)were evaluated using the experimental results and available test data of 74concrete beams reinforced with 500MPa longitudinal steel bars.
There are several practical advantages to using this new high-strength material, including reduction of congestion in heavily reinforced members, improved concrete placement, savings in the cost of labor, reduction of construction time.
There are several practical advantages to using this new high-strength material, including reduction of congestion in heavily reinforced members, improved concrete placement, savings in the cost of labor, reduction of construction time.
Online since: February 2018
Authors: Petr Štěpánek, Lukáš Lyčka
Presented experimental data are then compared with the results of tests on beams with regular shear FRP stirrups found in literature.
This grating consists of only perpendicularly placed fibers without any curvature so the reduction of strength in its corners does not occur.
Theoretical calculations of the shear strength of tested beams were carried out without reduction factors of strength in corners/bends.
This grating consists of only perpendicularly placed fibers without any curvature so the reduction of strength in its corners does not occur.
Theoretical calculations of the shear strength of tested beams were carried out without reduction factors of strength in corners/bends.
Online since: July 2014
Authors: Thiyagarajan Senthilvelan, Kannappan Venkatesh
The design of experimental sequence and analysis of experiment data were carried with the help of Design Expert, DOE software.
Vishal et al. explained the various techniques for heat reduction during high speed turning applications [3].
Dixit et al. observed that surface finish that obtained in air-cooled turning was found to be better than dry turning and also results in the reduction of wear land in CBN tools [8].
Vishal et al. explained the various techniques for heat reduction during high speed turning applications [3].
Dixit et al. observed that surface finish that obtained in air-cooled turning was found to be better than dry turning and also results in the reduction of wear land in CBN tools [8].
Online since: April 2009
Authors: Mei Zhu Chen, Shao Peng Wu, Wei Wei
Such temperature reductions can have
significant impacts on cooling energy consumption in urban areas, a fact of particular importance in
hot climate cities.
As part of a heat island reduction strategy, cool pavements contribute to the general benefits of heat island mitigation, including increased comfort, decreased air conditioning needs, and likely improved air quality.
Minimizing asphalt pavement deterioration and maximizing its durability requires high-quality asphalts, which are stiff enough to be resistant to permanent deformation (rutting) at elevated temperatures and soft enough to respond elastically to large loads at low 25 30 35 40 45 50 55 60 65 70 12:00 13:20 15:20 17:00 19:00 21:00 23:001:003:005:007:208:40 Time of Day Temperature(°C )))) Dense graded hot-mix asphalt Gap graded asphalt rubber HMA Portland cement concrete Fig.1 Surface temperature for different pavement materials using standard thermocouple sensors (redrawn based on the datas from Ref.[8]) temperatures[6].
l A composite structure for noise reduction, which also has been found to emit lower levels of heat at night.
As part of a heat island reduction strategy, cool pavements contribute to the general benefits of heat island mitigation, including increased comfort, decreased air conditioning needs, and likely improved air quality.
Minimizing asphalt pavement deterioration and maximizing its durability requires high-quality asphalts, which are stiff enough to be resistant to permanent deformation (rutting) at elevated temperatures and soft enough to respond elastically to large loads at low 25 30 35 40 45 50 55 60 65 70 12:00 13:20 15:20 17:00 19:00 21:00 23:001:003:005:007:208:40 Time of Day Temperature(°C )))) Dense graded hot-mix asphalt Gap graded asphalt rubber HMA Portland cement concrete Fig.1 Surface temperature for different pavement materials using standard thermocouple sensors (redrawn based on the datas from Ref.[8]) temperatures[6].
l A composite structure for noise reduction, which also has been found to emit lower levels of heat at night.