13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics最新文献_第8页

Aerodynamics and strength of a two-tier stage based on a fork-shape blade 基于叉形叶片的两层级的空气动力学和强度

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-153

A. Zaryankin, S. Osipov, T. Shibaev, M. Stepanov, D. Kshesinsky

引用次数: 0

Improvement of the performance of an axial fan with counter-rotation 反转轴流风机性能的改进

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-110

Adel Ghenaiet, Ibrahim Beldjilali

引用次数: 0

The effects of free-stream turbulence intensity on the aerodynamic performance of compressor cascade 自由流湍流强度对压气机叶栅气动性能的影响

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-382

M. Etemadi, J. Defoe, Reza Taghavi-Zonouz

引用次数: 0

Comparison of the cubic equations of state and different transport properties models for ORC turbines modeling 三次状态方程与不同输运特性模型在ORC涡轮建模中的比较

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/etc2019-141

A. Sebelev, M. Smirnov, N. Kuklina, K. Lapshin, A. Laskin

{"title":"Comparison of the cubic equations of state and different transport properties models for ORC turbines modeling","authors":"A. Sebelev, M. Smirnov, N. Kuklina, K. Lapshin, A. Laskin","doi":"10.29008/etc2019-141","DOIUrl":"https://doi.org/10.29008/etc2019-141","url":null,"abstract":"The present paper focuses on a comparison of cubic equations of state (EoS) with accurate Span-Wagner (SW) EoS. Aungier Redlich-Kwong (ARK) EoS, Soave Redlich-Kwong (SRK) EoS and standard Peng-Robinson (PR) EoS were chosen as the basic EoS implemented into ANSYS CFX commercial solver. Furthermore, modeling of transport properties was also considered. Rigid Non Interacting Sphere (NIS) and Interacting Sphere (IS) viscosity models were chosen for a comparison with REFPROP data. Analytically calculated density and viscosity were compared with the REFPROP values for 1 polar (ethanol) and 2 non-polar (R245fa, MDM) fluids at the first part of the investigation. This part showed no significant difference between compared EoS for the non-polar fluids and slightly lower accuracy of PR EoS for the polar fluid. A significant difference between NIS and IS models was showed. 2D CFD simulations of VKI LS-89 cascade were performed for both MDM and MD4M siloxanes at the second part. It was showed that a preliminary analysis of the fundamental gasdynamic derivative behavior for isentropic expansion is needed for choosing of an appropriate cubic EoS. The choice of NIS or IS transport models does not show a significant effect on the obtained results.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125635699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of statistical eddy-viscosity turbulence models for unsteady flow at part and overload operation of centrifugal pumps 离心泵局部非定常流场及过载工况的统计涡粘湍流模型评估

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-047

Nicolas Casimir, Zhu Xiangyuan, G. Ludwig, R. Skoda

引用次数: 8

Reliable seals for turbomachines: numerical analysis of the effects of compressible fluid flow through porous materials and narrow gaps 涡轮机器的可靠密封:可压缩流体通过多孔材料和窄间隙影响的数值分析

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/etc2019-303

S. Schoar, H. Dohmen, F.-K. Benra

{"title":"Reliable seals for turbomachines: numerical analysis of the effects of compressible fluid flow through porous materials and narrow gaps","authors":"S. Schoar, H. Dohmen, F.-K. Benra","doi":"10.29008/etc2019-303","DOIUrl":"https://doi.org/10.29008/etc2019-303","url":null,"abstract":"Leakage between rotating and stationary parts in turbomachines has a strong impact on performance and reliability. So, the demand for robust and reliable sealing solutions is high. Under challenging operating conditions, dry gas seals and aerostatic gas seals are used to avoid high leakage rates and high friction losses. Generally, an aerostatic seal is pressurized by several holes distributed over the sealing. As a result, a gap of a few micrometers between the slip ring and rotating ring arises. This operation is very similar to that of an air bearing. However, it has been shown in the past that the use of porous materials makes the flow film more stable regarding any force effects. The major difference between an aerostatic seal and an air bearing is that the porous layer of an air bearing is mounted in the housing in a fixed manner, while it is freely movable in a gas seal and thus adjusts autonomously with respect to its force equilibrium. These characteristic properties impact the entire operational behavior of a seal. In this paper a numerical investigation is undertaken to check the feasibility of an aerostatic gas seal with a porous ring. By using MATLAB, a design tool is developed to quickly calculate the pressure profile in the gap and the operational behavior of the seal. Special focus is put on the control of the permeability (pore distribution) and the geometric size of the porous material and its impact on the gap flow. The model is based on the assumption of Darcy’s law in the porous part and a laminar viscous flow field with isothermal conditions in the gap. Using a test bench, the numerical analysis is validated. In addition, the pressure distribution in the gap is shown when lifting the porous ring for different permeability distributions.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131345868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A novel grazing flow rig for acoustic liner investigations 一种用于声学尾管研究的新型掠流装置

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/etc2019-347

F. Taddei, M. D. Lucia, A. Pourreza, H. Rashidi, G. Pierucci, M. Messeri, F. Fagioli, M. Salvestroni, D. Torzo

引用次数: 0

Sampling strategies for metamodel enrichment and automotive fan optimization 元模型丰富和汽车风扇优化的采样策略

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-322

M. Henner, Thierry Gonon, B. Demory, C. Helbert

{"title":"Sampling strategies for metamodel enrichment and automotive fan optimization","authors":"M. Henner, Thierry Gonon, B. Demory, C. Helbert","doi":"10.29008/ETC2019-322","DOIUrl":"https://doi.org/10.29008/ETC2019-322","url":null,"abstract":"The strategy aimed at reducing the development time for a fan, which is oriented through the use of large meta-models which can be re-used and enriched along time. Efforts have been brought in the parameterization of the geometry and in the simulation process which provides pressure rise, torque and consequently efficiency. Numerical Designs of Experiments (DoE) are then conducted in an 11 factor problem to fill the space and to build a first kriging model. This latter assumes that the output is a gaussian field for which parameters are computed by maximum likelihood estimation based on the numerical runs. Uncertainties associated with any predicted values can then be assessed using the variance, and two small validation plans are used to measure statistically the errors. The variance given by the model is further used to map the areas in the domain which would need additional sampling. Then, two strategies are tested to select the most relevant sampling points, the first one being to reduce the range of the parameter variation, and the other one being to select them according to turbomachine design rules which would have dismiss some factor combinations. These two methods for sequential enrichment of the response are then compared and can even be combined with a trend given on the pressure rise. Answers from the kriging models are then assessed again in terms of statistical errors. These strategies will be described in the proposed paper through model comparison and optimization results.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116737984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermodynamic modeling of a closed gas turbine process working with Helium and stoichiometric combustion of Hydrogen and Oxygen 封闭燃气轮机过程的热力学模型与氦和氢和氧的化学计量燃烧

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-185

M. Schatz, M. Wachter

{"title":"Thermodynamic modeling of a closed gas turbine process working with Helium and stoichiometric combustion of Hydrogen and Oxygen","authors":"M. Schatz, M. Wachter","doi":"10.29008/ETC2019-185","DOIUrl":"https://doi.org/10.29008/ETC2019-185","url":null,"abstract":"For a successful transition of power generation away from fossil and nuclear fuels to renewable energy sources, the problems related to the storage of temporary surplus solar or wind energy and the subsequent utilization has to be solved. A promising approach for this is the generation of hydrogen from electrolysis, which can then be stored and used when necessary. However, large scale power generation from hydrogen with outputs in the Megawatt-range is currently difficult, as fuel cells do not offer such a large power output both from a technical and economical perspective and firing hydrogen in open cycle gas turbines will inevitably lead to high NOx-emissions, which is detrimental to the environment. This paper presents the results of a theoretical study of a closed cycle gas turbine working with helium and a stoichiometric combustion of hydrogen and oxygen, which is also a product of electrolysis. As helium is an inert gas, it is not affected by the combustion process, hence only water vapour is formed, which can be separated by condensation. As a consequence the process would allow large power outputs at zero emissions. For the study, different thermodynamic processes have been evaluated, starting from a simple closed cycle Brayton process to more sophisticated cycles with intercooling and humidification. For all processes, parameter studies have been performed to assess the sensitivity and impact of different parameters such as pressure ratio or turbine inlet temperature. In order to ensure the validity of the model, component efficiencies deduced from publications on the former Oberhausen II closed cycle helium gas turbine have been used. The results show that already the simple cycle process yields good efficiencies comparable to those of current state-of-the-art gas turbines. The improvement that can be achieved using process variations are considerably higher than for an open loop process, indicating that efficiencies in excess of 50% could be reached.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117003823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation of the aerodynamic and thermal behaviour of the film at the leading edge of a cooled nozzle vane cascade 冷却喷嘴叶片叶栅前缘气膜气动与热特性的实验研究

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-204

L. Casarsa, Fabio Pagnacco, H. Abdeh, G. Barigozzi

引用次数: 0