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Study on the Three-Dimensional flow Control of Two-Phase flow Around a Cylinder by an Attached Cylinder

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SSRN 2023年

作者： Xia, Yizhan Hu, Yu Huang, Shengxian Wang, Ying Shanghai key laboratory of multiphase flow and heat transfer of power engineering School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai China

Enhancing the separation of flow, shedding of vortices, and sediment deposition around blunt bodies, particularly in cylindrical flows within the realm of ocean engineering, emerges as a pivotal safety factor. This study delves into the control of two-phase flow encircling a cylinder using an affixed cylinder under three-dimensional real ocean conditions. Employing the SST turbulence model, a two-dimensional incompressible RANS numerical simulation is performed. Initially, the influence of varying gap ratios between the auxiliary small cylinder and the main cylinder is scrutinized. Subsequently, the impact of attached small cylinders on the flow field surrounding the main cylinder is examined under different particle characteristics. Lastly, employing the UDF function, four small cylinders exhibiting distinct vibration modes are defined, and the numerical simulation investigates the effects of Grain flow on particle flow and distribution in the wake region of the main cylinder. © 2023, The Authors. All rights reserved.

关键词： Cylinders (shapes)

A Novel Multi-Objective Stackelberg Game Model for Multi-Energy Dynamic Pricing and Flexible Scheduling in Distributed Multi-Energy System

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SSRN 2024年

作者： Ren, Xiaoxiao Wang, Jinshi Yang, Sifan Zhao, Quanbin Jia, Yifan Ou, Kejie Hu, Guangtao Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China School of Energy Engineering Yulin University Yulin719000 China

In the face of global energy and environmental challenges, distributed multi-energy system (DMES) offers a promising solution. To optimize resource allocation and promote energy market development, this paper proposes a novel multi-energy management and pricing framework based on multi-objective Stackelberg game. The DMES operator (DMEO) acts as the leader by optimizing DMES scheduling and pricing to guide user behavior towards revenue, energy consumption, and carbon emissions goals. Users adjust energy demand based on energy pricing to maximize consumption surplus. To achieve the low-carbon and flexible operation of DMES, carbon trading and demand response mechanisms are introduced. The model is solved using NSGA-III and Gurobi solver, with a robust optimization model with adjustable robust measure is established to address renewable energy uncertainty. The validity of the proposed model is verified by a data center in Qinghai. Compared with traditional Stackelberg game model, the proposed model reduces carbon emissions by 1.64% and energy consumption by 1.59%. Under this optimization framework, the exergy efficiency and energy efficiency of DMES are 0.535 and 0.798, and the share of renewable energy is 34.6%. Increased renewable energy uncertainty leads to lower DMEO revenue, higher carbon emissions and energy consumption, while significantly reducing energy and exergy efficiency. © 2024, The Authors. All rights reserved.

关键词： Energy utilization

Review, Numerical Validation, and Experiment Verification for Definite Solution Analogy Theory (Dsat) in Thermal-Hydraulic Scaling

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SSRN 2024年

作者： Li, Xinyu Zhang, Dalin Jiang, Dianqiang Zhou, Xingguang Lv, Xindi Tian, Wenxi Qiu, Suizheng Su, Guanghui State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China

The new generation of reactor technology: Fluoride-Salt-cooled high-Temperature Advanced Reactor (FuSTAR), mainly applied to remote, underground, and arid areas. The design of the heat transport system and Passive Residual Heat Removal System (PRHRS) of FuSTAR has been finished, but the verification still needs to be carried out. In this study, the Definite Solution Analogy Theory (DSAT) was used for scaling analysis, and the scaling experiment platform was built. DSAT was verified through numerical simulation and experiment results. The numerical test results show the similarity of physical fields in dimensionless space on the prototype and experiment under the DSAT framework. The steady-state experiment results show that the prototype of PRHRS can take away more than 1% of the decay heat of the total thermal power. The transient experiment results show that the maximum deviation of dimensionless solutions is less than 4%, which proves the high accuracy of DSAT and the PRHRS based on this framework can effectively remove the decay heat in the reactor. This work can be used to extend the scaling method of thermal-hydraulic in high dimensional space and transient conditions. © 2024, The Authors. All rights reserved.

关键词： Fluorine compounds

Experimental and Numerical Simulation Study on Critical Heat Flux in Narrow Rectangular Channels

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SSRN 2024年

作者： Lv, Xindi Zhang, Dalin Song, Gongle Su, Guanghui Tian, Wenxi Qiu, Suizheng State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China

Experimental investigation was performed on the critical heat flux (CHF) in narrow rectangular channels. The rectangular channel adopts single-side heating, the channel gaps were 1.3 and 1.9mm, the system pressure was 1~4Mpa, the inlet subcooling was 20~100K, and the mass flux was 200~1500 kg/(m2⋅s). The variation of CHF in vertical upward flow with different thermal parameters and geometric dimensions was studied. A three-fluid transient model was established to calculate the CHF of vertical upward annular flow in narrow rectangular channel. The calculation model was validated with CHF experimental data and the results were in good agreement. Combining experimental and theoretical research results, it could be concluded that the mass flow rate played an important role in the critical heat flux phenomenon of narrow rectangular channel, and its magnitude directly affected the effect of changes in thermal parameters such as pressure, mass flow rate and inlet subcooling on CHF. © 2024, The Authors. All rights reserved.

关键词： Heat flux

Quantitative detection of alkali metal Na based on laser-induced breakdown spectroscopy technology

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Meitan Xuebao/Journal of the China Coal Society 2025年第4期50卷 2262-2270页

作者： Shen, Sijie Li, Chi Zhou, Wangzheng Wang, Zhenzhen Yan, Junjie Hou, Zongyu Wang, Zhe Deguchi, Yoshihiro School of Energy and Power Engineering Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Power System Operation and Control Tsinghua University Beijing100084 China Institute for Carbon Neutrality Tsinghua University Beijing100084 China Department of Energy and Power Engineering Tsinghua University Beijing100084 China Shanxi Research Institute for Clean Energy Tsinghua University Taiyuan030032 China Graduate School of Technology Industrial and Social Sciences Tokushima University Tokushima770-8506 Japan

The alkali metal compounds released from high alkali fuels such as low-quality coal during thermal utilization can affect the normal operation of thermal equipment. Therefore, rapid online detection of alkali metal content in low-quality coal is of great significance for controlling alkali metal release during combustion. The alkali metal Na element is used as the detection object, and the mixed samples of graphite and sodium chloride powder with different ratios are used as experimental samples. The influencing factors of measuring Na element in samples using laser induced breakdown spectroscopy (LIBS) technology are studied. The impact of two signal strength calculation methods on signal stability is compared. The influence of experimental parameters on signal strength and signal-to-noise ratio is analyzed. The quantitative calculation models for Na element have been established. Research has shown that the characteristic spectral lines of Na element, Na I 588.995 nm and Na I 589.592 nm, are suitable as the main analytical spectral lines. Using the area intensity of the dual line characteristic spectral lines of Na element as the signal intensity can effectively improve signal stability. When the laser energy is 60 mJ and the delay time is 1 000 ns, the relative standard deviation of spectral signal intensity is low and the signal-to-noise ratio is high. The quantitative calculation models are established using traditional calibration method, partial least squares (PLS) method, and support vector machine (SVR) with spectral signal intensity as the input and Na element addition in the sample as the output. The accuracy of each model is compared and analyzed. The results indicate that the PLS model may exhibit overfitting when the sample size is small and the input quantity is large. The fitting accuracy of the SVR model is 0.978 3, the root mean square percentage error of the training set is 13.42%, and the root mean square percentage error of the test set is 13.51

关键词： Sodium chloride

Wall temperature calculation and safety analysis for the water wall of 660 MW ultra-supercritical circulating fluidized bed boiler 13

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Wall temperature calculation and safety analysis for the wat...

13th International Conference on Fluidized Bed Technology, CFB 2021

作者： Yang, Dong Liang, Ziyu Dong, Le Zhou, Xihong Li, Juan State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China

ISBN: (纸本)9781771368506

Temperature safety analysis was conducted on the smooth tube of the supercritical circulating fluidized bed boiler through experiments, numerical simulation, and hydrodynamic calculation. The numerical simulation results of the inner wall temperature were compared with the results of the experiments and hydrodynamic calculation. Experimental results showed that heat transfer enhancement occurred near a pseudocritical point. Non-uniform circumferential heating weakened the buoyancy effect, which could effectively delay or prevent the occurrence of heat transfer deterioration, and the circumferential distribution of the wall temperature and heat flux was parabolic. The simulated results of the inner wall temperature were in satisfactory agreement with the experimental results. Furthermore, the inner wall temperature values of the hydrodynamic calculation were lower than the experimental values. These findings indicated that the temperature experimental results obtained by non-uniform circumferential heating were conservative. © 2021 CFB 2021 - Proceedings of the 13th International Conference on Fluidized Bed Technology. All rights reserved.

关键词： Heat flux

Study on supercritical water regeneration of bio-based activated carbon saturated with acid red G

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Carbon Resources Conversion 2024年

作者： Mu, Yaling Zhuang, Zitong Jiang, Kun Wei, Yimeng Meng, Anjun Jin, Hui State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi Xi'an710049 China CNNP CHD Hebei Nuclear Power Co. Ltd. Hebei Cangzhou061000 China

The dye and textile industry commonly employs activated carbon adsorption technology due to its cost-effectiveness and high efficiency. However, disposing of waste-activated carbon has a significant environmental and human health impact, and it's a huge economic waste. This study investigates the kinetic and isothermal adsorption characteristics of Acid Red G dye adsorption by Powdered Activated Carbon derived from coconut shells. To effectively reuse activated carbon and maximise resource conservation, regeneration experiments were carried out using Supercritical Water at 24 MPa and 400 ℃ for 30 min. The experimental results demonstrated that, in comparison with thermal regeneration, supercritical water possesses the benefits of environmental protection, economic efficiency and extensive applicability. This is of considerable importance to the field of research concerning the regeneration of activated carbon. © 2024

关键词： Carbon sequestration

Chromium Promoted the Efficient and Stable Catalytic Degradation of Propane Over Pt/Hzsm-5 Catalyst: Optimization and Reaction Mechanism

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SSRN 2025年

作者： Jian, Yanfei Xu, He Wang, Yao Wang, Jingjing Xia, Lianghui Liu, Yujie Yu, Yanke He, Chi State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Shaanxi Xi'An710049 China National Engineering Laboratory for VOCs Pollution Control Material and Technology University of Chinese Academy of Sciences Beijing101408 China Yunnan University China

Light alkanes are a class of ubiquitous volatile organic compounds (VOCs), which bring great environmental hazards and health risks. However, low-temperature degradation of light alkanes is still a great challenge. Herein, a series of Pt/HZSM-5 catalysts without/with additives of Cr were fabricated. Catalytic performance of the catalyst for C3H8 low temperature combustion was investigated. It was found that Cr element had a significant effect on the activity of Pt/HZSM-5. Pt/Cr1/HZSM-5 performed the best activity for C3H8, excellent high temperature stability and water resistance. Characterization results of catalysts indicated that the introduction of Cr element could fix Pt site to promote the dispersion of Pt on the support. Moreover, the interaction between Cr and Pt produced more active Pt species, surface active lattice oxygen and acidic sites, which could promote the activation of C-H bonds in C3H8. Theoretical calculations showed that the interface between Pt and Cr had stronger adsorption for O2 and C3H8, which could accelerate propane oxidation. In this study, the effect of transition metal elements on the promotion of noble metal catalysts in the low-temperature degradation of light alkanes was discussed in depth, and it provided a reference for the design of efficient noble metal molecular sieve catalysts. © 2025, The Authors. All rights reserved.

关键词： Molecular sieves

A Novel Mass-Heat Exchange Network Analogy, Regression, and Synthesis Method for Mass Exchanger Networks

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SSRN 2023年

作者： Xiao, Yuan Cui, Guomin Shanghai Key Laboratory Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai20093 China

The mass exchanger network (MEN) synthesis is significant for material savings and pollution reduction in process industries. Considering its small magnitude and the concentration constraints, the optimized MEN configuration could easily violate the concentration constraints, leading to a reduction in the structural diversity during the optimization process compared to that of an heat exchanger network （HEN）of the same size. Moreover, the constraint on the mass transfer driving force based on the equilibrium composition might also have major effects on the optimization process. To address this, this paper presents a process-equipment-system analogy between the MEN and the HEN, proposing a novel mass-heat exchange network analogy, regression, and synthesis method. First, the generalized HEN was established by an analogy considering the MEN based on either the original or the equilibrium compositions. In this regard, a coordination coefficient was introduced to correct the deviation of the analogy relationship between the heat transfer and the mass transfer processes. Then, the generalized HEN was optimized by employing the random walk algorithm with compulsive evolution (RWCE). A regression method was proposed to regress the optimized HEN solution to the MEN expression, allowing the continuous optimization by the RWCE with finer parameters. The final optimal solution obtained is found to be lower than those reported in the literature with enhanced structural diversity, demonstrating the method’s effectiveness and providing new ideas for further synchronous optimization of combined heat and mass exchanger networks. © 2023, The Authors. All rights reserved.

关键词： Mass transfer