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2009 IEEE International Conference on Plasma Science - Abstracts, ICOPS 2009

作者： Liu, H.X. Zhang, H.J. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Environmental Engineering Xi'an Jiaotong University Xi'an 710049 China

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Simulation of a standing‐wave thermoacoustic engine using compressible SIMPLE algorithm

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AIP Conference Proceedings 2010年第1期1207卷 939-944页

作者： Dongwei Zhang Yaling He Yong Wang Jing Huang aState Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University China

In present paper, a two‐dimensional numerical study on a standing‐wave thermoacoustic engine was performed with compressible SIMPLE algorithm based on a pressure‐correction method. First, the simulation model was developed, and the time‐dependent compressible thermoacoustic engine system was chosen through substantive numerical tests. Appropriate governing equations for mass, momentum and energy were introduced. Then, the computational results of the onset of the self‐excited oscillations across the entire evolution process and the acoustical characteristics of the pressure and velocity wave were presented and analyzed. In addition, the standing‐wave of the pressure and velocity along the center of the two stacks are investigated. The crucial nonlinear phenomenon that cannot be captured by the existing linear theory, like high harmonic frequencies, is also revealed in present paper. It is concluded that compressible SIMPLE algorithm could be employed in our future work to simulate and optimize thermoacoustic system. The present result is an important step toward development to predict the high‐amplitude thermoacoustic systems and optimize thermoacoustic engine performance.

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Pressure drop of single/two-phase flows through porous bed with sand particles 17

Pressure drop of single/two-phase flows through porous bed w...

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17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2017

作者： Li, Liangxing Kong, Liubo Wang, Huasheng Zou, Xumao Lei, Xianliang Li, Huixiong State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xian-ning West Road 28# Xi’an city710049 China

Motivated by reducing the uncertainties in quantification of debris bed coolability in a severe accident of light water reactors (LWRs), this paper reports experimental studies on the pressure drops of single /two phase flows through packed porous beds with sand particles. A test facility named DEBECO-LT is constructed to investigate the friction laws of adiabatic single and two-phase flow through a particulate bed. From the single flow test, the effective diameter of bed with sands particles can be derived from the measured pressure drops and the Ergun equation. Based on this effective diameter, two phase flow tests are performed and the prediction models are verified by comparing the measured data and the calculations with different analysis models. The results show that in the case of beds with smaller sands particles, the measured pressure drops show gradual increasing tendency with fluid flowrate, and the predictions of Reed model are closer to the measured two-phase flow pressure drop at higher flowrates. For the packed beds with coarse sands particles, the pressure drops would show descent-ascent tendency and there were hardly any models predicting well the measured pressure drop. There is a clear need to develop an accurate analysis models for the bed with coarse particles. © 2016 Association for Computing Machinery Inc. All Rights Reserved.

关键词： Pressure drop

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Kinetic study of the isomerization for endo-tetrahydrodicyclopentadiene over AlCl3 catalyst

Kinetic study of the isomerization for endo-tetrahydrodicycl...

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2011 2nd International Conference on Mechanic Automation and Control engineering, MACE 2011

作者： Hao, Miaoli Wu, Weitao Qi, Suitao Yang, Bolun Yang, Jianming Zhang, Wei Lv, Jian Department of Chemical Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Xi'an Modern Chemistry Research Institute Xi'an China

ISBN: (纸本)9781424494392

The isomerization of endo-tetrahydrodicyclopentadiene (THDCPD) to exo-THDCPD over AlCl3 catalyst has been studied in a batch reactor. The effects of temperature, catalyst loading, and the type and amount of solvent on the isomerization rate were investigated. Under the conditions of removing both internal and external diffusion effects, a kinetic model was established and the model parameters were developed. The results showed that the endo- to exo- isomerization of THDCPD can be treated as a first-order reaction. The activation energy E0 and pre-exponential factor obtained from Arrhenius plot are 116 kJ /mol and 3.39×1013 respectively. The simulation results agreed well with the experimental data. © 2011 IEEE.

关键词： Isomerization

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Experimental investigation for liquid holdup reduction of subsea riser with surfactant

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AIP Conference Proceedings 2010年第1期1207卷 119-124页

作者： C. Li L. Liu Q. B. Bao F. D. Zhou State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University China

The principal pressure drop in a subsea riser is generally the gravitational pressure drop component due to liquid holdup. Surfactant is a kind of Chemical compound related to flow improvement. Gas‐liquid two‐phase flow in subsea riser with zero and small liquid flow rates was simulated in two vertical tubes with diameters of 40 mm and 65 mm, respectively. Liquid holdup reduction of subsea riser was investigated with surfactant. The simulation was conducted at low pressure, using air as the gas phase and water as the liquid phase. Pressure drop was measured by using differential pressure transducer and holdup was obtained by trapping the liquid in the pipe section. Different trace amounts of surfactant were used in this vertical two‐phase flow system. The liquid holdups were measured at different surfactant concentrations and different gas‐liquid flow ratios. Liquid holdups with and without surfactant additives are compared and analyzed. How the foamer influences the two‐phase flow pattern was observed and the range of foamer concentration corresponding to the best holdup reduction was obtained.

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Sustainability Assessment of Typical Energy Storage Technologies for Peak Shaving Scenarios Based on the Full Life Cycle 36

Sustainability Assessment of Typical Energy Storage Technolo...

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36th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2023

作者： Chen, Nana Han, Xiaoqu Li, Yanxin Huang, Xiaofan Li, Jiarui Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Huadian Electric Power Research Institute Co. Ltd. Beijing China

ISBN: (纸本)9781713874928

With more renewable energy sources (RES) which are inherent intermittent and unpredictable connecting with power grid, various stability problems occur, among which the peak load regulation is the most prominent. Energy storage systems (ESSs) are essential for buffering the electricity grid. Selecting the most suitable energy storage technology among various alternatives is of great importance. In this work, the sustainability of typical energy storage technologies was studied with respect to four aspects for peak shaving scenarios, including technical (i.e. maturity, energy density, round-trip efficiency, duration ranges, life cycles, lifetime and position flexibility), economic (levelized cost of energy, net present value), environmental (i.e. global warming, damage to human health, damage to ecosystems, damage to resource availability) and social (public acceptance) based on the full life cycle. This study evaluated the soft criteria including maturity, position flexibility and public acceptance by Analytic hierarchy process (AHP). Life cycle assessment (LCA) and life cycle cost (LCC) methods were combined to study the life-cycle environmental and economic performance. Technique for order preference by similarity to an ideal solution (TOPSIS) was applied for determining the sustainability prioritization of energy storage technologies. The sensitivity analysis was carried out to investigate the effects of control and economic input parameters on environmental performance and economic performance. In addition, the effects of criteria weights, electricity sources and number of daily cycles were conducted on sustainability ranking of ESSs. The results showed Lithium iron phosphate battery (LIPB) and pumped hydro storage (PHS) had good sustainability performance, which could be the most suitable energy storage technologies for peak shaving scenarios. © (2023) by ECOS 2023 All rights reserved.

关键词： Life cycle

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Fuel Nitrogen Evolution during Coal Pyrolysis and Gasification

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AIP Conference Proceedings 2010年第1期1207卷 56-65页

作者： Defu Che Yinhe Liu Junguang Lin State Key Laboratory of Multiphase Flow in Power Engineering X’an Jiaotong University China

The morphology of fuel nitrogen in coal and its fate during pyrolysis and the nitrogen species including N2, HCN and NH3 during coal pyrolysis and gasification have been investigated to clarify the evolution mechanism of fuel nitrogen in heat treatment process. Experimental results show that the morphology of coal nitrogen in the studied Chinese raw coals generally include pyrrolic nitrogen (N‐5), pyridinic nitrogen (N‐6), quaternary nitrogen (N‐Q) and nitrogen‐oxide (N‐X). Generally, nitrogen in char is transformed to volatile and more stable components during pyrolysis. Char‐N is the major source of NOx precursors during temperature programmed pyrolysis in 600–800° C. N‐5 and N‐X in char is converted to HCN first, and HCN is then hydrogenated to NH3. N‐Q in char is the main source of nitrogen gas. The major nitrogenous gas products during rapid coal pyrolysis are N2, HCN and NH3, amongst which N2 is dominant. The yields of N2 and NOx precursors, such as HCN and NH3, increase with increased pyrolysis temperature. The major gaseous nitrogenous products during coal gasification in steam include HCN, NH3 and N2. H2O is the main source of the groups containing hydrogen, which not only participates in the reaction as a gasification agent, but also has catalysis on the reaction.

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Simulating free surface problem with moving particle semi-implicit method

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Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 2010年第11期44卷 109-112页

作者： Rong, Shaoshan Chen, Bin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The moving particle semi-implicit method (MPS) was used to simulate the typical free surface problem, 2D dam break problem, and the effect of initial particle configuration on the simulated results was analyzed. It is found that the reasonable results can not be achieved for too large or too small particle distance. The comparison of the results by MPS, SPH or VOF with the experimental data shows that the result by MPS is between those by VOF and by SPH. Without the consideration of viscosity, the result by MPS is closer to the experiment than that by VOF. However, the result by MPS with the consideration of viscosity may be similar to that by SPH.

关键词： Viscosity

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The experimental study on aneurysm with PIV system

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AIP Conference Proceedings 2013年第1期1547卷 205-220页

作者： Wang Yueshe Ma Xiaoqi Li Di State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

Cerebral aneurysm, a local enlargement of an artery caused by weakness in the wall of a cerebral artery, has the high death rate and disability rate, and is a threat to public health. The forming mechanism of aneurysm is complex, which motivated many researchers to conduct studies in this field. The results indicated that increasing heart frequency can aggravate the oscillation of wall shear stress, and push The growth points of aneurysm along the aneurysm wall, thereby significantly affecting bthe growth and rupture mechanism of aneurysm. In addition, it is found that the curvature of the vessel is the key to induce the secondary vortex in the aneurysm; the secondary vortex increases the magnitude of WSS near the dome of aneurysm, which can cause the rupture of aneurysm dome. there is a linear relationship between the velocity of blood flow and the square root of hear frequency.

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Experimental Study on Deliquification with Atomizing Nozzle in Gas Well

Experimental Study on Deliquification with Atomizing Nozzle ...

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作者： Yutang Gao Xiaobai Li Peng Chang Lei Liu State Key Laboratory of Multiphase Flow in Power Engineering

Gas is a clean energy resource in comparison with oil and coal. Liquid-loading problem is frequently encountered in the process of gas production. It would directly cause the production of gas wells decreasing, even off production. A number of deliquification techniques have been suggested for solving this kind of problem, but the available techniques are not yet widely applicable. Based on the analysis, the method of deliquification with atomizing nozzle in gas wells was put forward. The test bench was designed for studying the atomization of nozzles and the liquid entrainment of gas flow. The size distribution of atomized droplets was measured by Malvern laser grain size analyzer. The Sauter mean diameters of atomized droplets were analysed under different two-phase flow conditions. The results indicate that the designed nozzles have good atomization performances and show potential application for reducing liquid loading in gas wells.

关键词： Gas well liquid loading deliquification atomizing nozzle two-phase flow

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