scholarly journals Numerical Simulation and Field Synergy Analysis of IGBT Air-Cooled Heat Exchanger for EMUs

2020 ◽  
Vol 38 (3) ◽  
pp. 650-658
Author(s):  
Ying Guan ◽  
Minghai Li ◽  
Hongjiang Cui

In view of the heat transfer and ventilation characteristics of the Insulated Gate Bipolar Transistor (IGBT) in the Electric Multiple Unit (EMU), the authors aim to improve the traditional fin structure of the air-cooled heat exchanger (ACHE) and propose the use of corrugated fin structure. Using the computational fluid dynamics (CFD) technology, the ACHE with new fin structure was numerically simulated, and the temperature field, velocity field and pressure field at different fin corrugation angles and the synergy between the fields were analyzed. The results show that the improved fin structure can make the fluid flow in a corrugated flow channel, effectively increase the flow distance, and thus significantly enhance the turbulence performance of the fluid in the ACHE; the fin corrugation angle of 120 degrees is the key design point; compared with the traditional fin structure, the new fin structure improves the synergy between the various fields and increases the heat exchange efficiency. The research findings provide new ideas for the design of this type of ACHE.

2013 ◽  
Vol 341-342 ◽  
pp. 546-549
Author(s):  
Hui Li ◽  
Rui Hua Hu

Based on the principle and method of computational fluid dynamics (CFD), using the software, FLUENT, the inner water flow field in the cross-section geometric model of a triangle-arranged tubular heat exchanger was simulated and the flow details were studied roundly. This article analyzed the temperature field distribution, pressure field distribution and pointed out the main factors that affected the effect of the heat transfer. The results of this paper provided a good base and reference for the further research on the optimum design.


Author(s):  
Ruan A. Engelbrecht ◽  
Johan Van der Spuy ◽  
Chris J. Meyer ◽  
Albert Zapke

This paper details the design, validation and verification of two implicit modelling techniques used to model an Air-Cooled Condenser (ACC) in the computational fluid dynamics (CFD) code environment of OpenFOAM (Open Source Field And Manipulation). The actuator disk model was chosen as the axial flow fan model and the heat exchanger model was implemented as an A-frame, or Delta frame, heat exchanger commonly found on power stations. Both models were validated and verified. A 30 fan ACC was verified against previous literature. The results for all validation and verification procedures showed good agreement with respective data. Three different fan configurations in an ACC were compared at different wind speeds namely the A-fan, B2a-fan and a Combined ACC. The study showed small differences between ACCs with regard to fan and thermal performance. However, the B2a-fan ACC consumed 20% less power than the A-fan ACC and 3–10% less power than the Combined ACC. This performance increase was most prominently show-cased by the increased heat-to-power ratio with the B2a-fan exhibiting heat-to-power ratios of 110 W/W compared to 96 W/W for the A-fan.


2021 ◽  
Vol 904 (1) ◽  
pp. 011001

The ICDS conference intends to bring together junior and senior, international and national researchers, scientists and scholars interesting in the field of desertification combat and water harvesting in desert regions. We think the conference will offer an excellent opportunity for networking with other members and exchange knowledge and explore the most recent developments in the desertification combat such as Water Resources Management in Desert Regions, Ecosystem and Biodiversity of Desert, Geology and Remote Sensing for Combating Desertification, Recent Agricultural Techniques Serving in Desert Soil Management, and Desert Regions Exploitation for Agricultural Production Regards. ICDS-2021 is a prestigious event organized by the Center of Desert Studies in cooperation with the College of Agriculture, University of Anbar, with a motivation to provide an excellent international platform for academicians, researchers, engineers, industrial participants and budding students around the world to share their research results with the global experts. We cordially invited participants from all over the world who wish to share their best practices and research findings in ICDS-2021 and enlighten their new ideas to make this event growing from strength to strength. Participants will be offered the opportunity to contribute to the conference in various roles: they can discuss keynotes, produce a poster presentation and submit full research or review articles. Articles submitted to the conference should report original high-quality and previously unpublished results. Submission of a manuscript implies that it is not under consideration for publication elsewhere. All submitted articles will be subjected to a double-blind peer-review process. Novelty, relevancy, language standards, references, and many other factors are considered for the evaluation process. The conference nominated Prof. Dr. Prof. Dr. Amir Ibrahim (College of Agriculture & Life Science Texas A&M University, U.S.), Prof. Dr. Medhat M. Elsahookie (College of Agriculture, University of Baghdad, Iraq), and Prof. Dr. Wadid Erian (Faculty of Agriculture, Cairo University, Egypt) as keynote speakers. ICDS-2021 will be held basically via physical attendance (In-person) for two days 17-18 November, 2021 in Ramadi, Anbar, Iraq. Each participant will be given approximately 10 minutes to view the most important findings of his/her research, and 5 minutes to discuss these results. Sincerely yours, Prof. Dr. Nihad Mohammed Aboud Director of the Center of Desert Studies/University of Anbar The Chairman of ICDS-2021 List of Committees (ICDS-2021) are available in this pdf.


2017 ◽  
Vol 154 ◽  
pp. 517-525 ◽  
Author(s):  
F. Huchet ◽  
M. Piton ◽  
A. Del Barrio ◽  
O. Le Corre ◽  
B. Cazacliu

2013 ◽  
Vol 35 (6-8) ◽  
pp. 711-720
Author(s):  
Dongjie Zhang ◽  
Qin Chen ◽  
Qiuwang Wang ◽  
Xiangyang Xu

2019 ◽  
Vol 11 (16) ◽  
pp. 4402 ◽  
Author(s):  
Xianfeng Huang ◽  
Zhen Lu ◽  
Zhixiang Zhuang

By analyzing measurements of the thermal environment of a qilou (arcade building) street, this study used the relative warmth index (RWI) to evaluate the thermal comfort in the colonnade space of a qilou. The analysis of the influence of the temperature, humidity, and wind speed on the thermal comfort in the colonnade space of a qilou street was conducted, and it was shown that the ambient wind speed had a strong influence on the RWI, indicating that a proper increase in the wind speed positively affected thermal comfort in this space. Then, this study also analyzed the effects of different forms of qilou streets on the wind environment by employing computational fluid dynamics (CFD) and summarized the architectural design measures that can improve the thermal comfort, including adopting back chamfer, street gaps, and the appropriate sizing of building components. It was concluded that the wind environment of a qilou could be optimized in terms of these measures, and the average RWI value decreased by 0.06, effectively enhancing the thermal comfort in the colonnade space. The research findings are applicable toward designing a thermally comfortable environment in the transitional space.


Author(s):  
Yanqiang Kong ◽  
Weijia Wang ◽  
Lijun Yang ◽  
Xiaoze Du ◽  
Yongping Yang

2017 ◽  
Vol 139 (7) ◽  
Author(s):  
Peter Kaluza ◽  
Christian Landgraf ◽  
Philipp Schwarz ◽  
Peter Jeschke ◽  
Caitlin Smythe

In aero-engine applications, centrifugal compressors are often close-coupled with their respective diffusers to increase efficiency at the expense of a reduced operating range. The aim of this paper is to show that state-of-the art steady-state computational fluid dynamics (CFD) simulations can model a hubside cavity between an impeller and a close-coupled diffuser and to enhance the understanding of how the cavity affects performance. The investigated cavity is located at the impeller trailing edge, and bleed air is extracted through it. Due to geometrical limitations, the mixing plane is located in the cavity region. Therefore, the previous analyses used only a cut (“simple”) model of the cavity. With the new, “full” cavity model, the region inside the cavity right after the impeller trailing edge is not neglected anymore. The numerical setup is validated using the experimental data gathered on a state-of-the art centrifugal compressor test-rig. For the total pressure field in front of the diffuser throat, a clear improvement is achieved. The results presented reveal a drop in stage efficiency by 0.5%-points caused by a new loss mechanism at the impeller trailing edge. On the hubside, the fundamentally different interaction of the cavity with the coreflow increases the losses in the downstream components resulting in the mentioned stage efficiency drop. Finally, varying bleed air extraction is investigated with both cavity models. Only the full cavity (FC) model captures the changes measured in the experiment.


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