13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics最新文献

Dynamics of a spray formed by laminar liquid jet in modulated crossflow 调变横流中层流射流形成喷雾的动力学

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 2019-04-08 DOI: 10.29008/ETC2019-366

V. Bodoc, Anthony Desclaux, P. Gajan, F. Simon, Geoffroy Illac

引用次数: 0

Sensitivity of the aerodynamics damping coefficient prediction to the turbulence modelling conjugated with the vibration mode shape. 气动阻尼系数预测对与振型共轭的湍流模型的敏感性。

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 2019-04-08 DOI: 10.29008/ETC2019-016

P. Duquesne, B. Mahieux, S. Aubert, P. Ferrand

{"title":"Sensitivity of the aerodynamics damping coefficient prediction to the turbulence modelling conjugated with the vibration mode shape.","authors":"P. Duquesne, B. Mahieux, S. Aubert, P. Ferrand","doi":"10.29008/ETC2019-016","DOIUrl":"https://doi.org/10.29008/ETC2019-016","url":null,"abstract":"The flutter corresponds to an aerodynamic loading of the structure which amplifies the natural blade vibration. In this paper, a modern design of a high pressure compressor is investigated using a time-linearized RANS solver on 2D blade to blade channel. Two operating points at part speed have been selected, the first with only small supersonic pockets and the second with the interblade channel blocked. Two vibration modes are investigated, the first torsion mode (with a nodal diameter at 2) and the first flexion mode (with a nodal diameter at 2, 4 and 6). Two different two equations turbulence models, k-l and k-ω have been used to resolve the steady state. The unsteady resolution is based on the previous steady state field. Turbulent variables are calculated over time based on a k-ω turbulence model. It was found that for some mode shapes, but not for all, the work exchange between the flow and the blade presents a large disparity depending on the turbulence model used primarily in the steady calculation. This paper proposes a parametric study in terms of rotor velocities, nodal diameters and vibration mode shapes to determine which flow phenomena are sensitive to the turbulence modelling. Main results point to the effect of the shockwave motion, and its interaction with the boundary layer and its separation.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116349154","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: 3

Some guidelines for the experimental characterization of turbocharger compressors 涡轮增压器压气机实验特性的若干准则

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 2019-04-08 DOI: 10.29008/ETC2019-257

Tobias Dielenschneider, J. Bühler, Sebastian Leichtfuß, H. Schiffer

引用次数: 0

A new rotating test facility for the experimental characterisation of shaft seals 一种用于轴封试验特性的新型旋转试验装置

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 2019-04-08 DOI: 10.29008/ETC2019-105

Ernesto Pedraza-Valle, James A. Scobie, C. Sangan, P. Keogh, A. Bowsher, P. Crudgington

{"title":"A new rotating test facility for the experimental characterisation of shaft seals","authors":"Ernesto Pedraza-Valle, James A. Scobie, C. Sangan, P. Keogh, A. Bowsher, P. Crudgington","doi":"10.29008/ETC2019-105","DOIUrl":"https://doi.org/10.29008/ETC2019-105","url":null,"abstract":"Turbomachinery shaft seals suffer from rubs caused by thermal growth, assembly misalignment and rotor dynamic vibration at engine start-up and shut-down. Rubs are detrimental to performance, leading to a decrease in overall efficiency and costly corrective maintenance. In recent years, compliant seals have been developed, allowing for variable clearances and a reduced frequency of seal rubs. The design goal for compliant seals is therefore, to maintain a tight clearance between rotating and non-rotating parts, throughout the transient conditions experienced in engines. This paper presents the design of a new high-speed rotating test facility developed for the performance characterisation of turbine shaft seals. The rig features a 254 mm diameter rotor, capable of rotating at speeds of up to 15,000 rpm (equivalent to rotor surface speeds up to 200 m/s). The maximum pressure difference across a seal is 3.5 bar. In the first experimental campaign, the performance of a labyrinth seal was investigated. The rotordynamic coefficients of the seal were calculated by exciting the casing with an electromagnetic shaker. The leakage performance, direct and cross-coupled seal stiffnesses and effective damping coefficients are determined.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128220647","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

Impact of large tip clearance ratios on the performance of a centrifugal compressor 大叶尖间隙比对离心压缩机性能的影响

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 2019-04-08 DOI: 10.29008/ETC2019-304

M. Diehl, J. Schiffmann

{"title":"Impact of large tip clearance ratios on the performance of a centrifugal compressor","authors":"M. Diehl, J. Schiffmann","doi":"10.29008/ETC2019-304","DOIUrl":"https://doi.org/10.29008/ETC2019-304","url":null,"abstract":"Ultra-compact and fast spinning turbomachinery is a key technology to increase performance of domestic heating applications and to address decentralization of power and heat as a consequence of the rise of renewable energy sources. Recently, a heat pump using a reduced-scale centrifugal compressor with an impeller diameter of 20 mm supported on gas bearings was tested successfully and higher system performance compared to commonly used positive displacement compressors was achieved. Nonetheless, due to the small feature size as well as manufacturing tolerances, the performance of such compressor systems is deteriorated compared to large-scale systems. The tip gap necessary to ensure a free spinning of the rotor on gas bearings is relatively large compared to industrial compressors.Unfortunately, limited experience about centrifugal compressors running on relative large clearance exists. This paper investigates the impact of tip leakage on the performance of centrifugal compressor systems for relative clearance ratios, ranging from 3 up to 15 %. The tip leakage analysis is conducted numerically on an experimentally validated centrifugal compressor system operating with refrigerant R134a. In order to investigate the behavior of the compressor by altering its clearance ratio, impellers with different blade heights are used to adjust the tip gap. The change in efficiency is investigated and empirical correlations available in literature are assessed. A new method to predict change in efficiency as function of relative clearance ratio is provided, thus extending current correlations to much higher relative clearance ratios.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"319 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123098955","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: 2

Aerodynamical and aeroelastic investigations of a riblet design applied on the surface of turbine exit guide vanes of a low pressure turbine 低压涡轮出口导叶表面波纹设计的气动与气动弹性研究

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 2019-04-01 DOI: 10.29008/ETC2019-055

M. Zenz, Asim Hafizovic, L. Simonassi, P. Leitl, Richard Benauer, F. Heitmeir, A. Marn

引用次数: 1

Preliminary assessment of a pump used as turbine in a water distribution network for the recovery of throttling energy 配水网中作为水轮机的水泵节流能量回收的初步评价

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-436

M. Stefanizzi, T. Capurso, G. Balacco, M. Torresi, Mario Binetti, A. F. Piccinni, B. Fortunato, S. Camporeale

{"title":"Preliminary assessment of a pump used as turbine in a water distribution network for the recovery of throttling energy","authors":"M. Stefanizzi, T. Capurso, G. Balacco, M. Torresi, Mario Binetti, A. F. Piccinni, B. Fortunato, S. Camporeale","doi":"10.29008/ETC2019-436","DOIUrl":"https://doi.org/10.29008/ETC2019-436","url":null,"abstract":"Nowadays, the increasing energy demand represents a priority issue to be faced on social, economic, political and technical points of view. For a sustainable development, renewable energy sources should be preferred to the conventional ones. In water distribution networks, Pumps as Turbines (PaTs) can represent a cost-effective alternative to conventional turbines for the recovery of the throttling energy. In this framework, a preliminary assessment of the installation of a PaT in the water distribution network of Casamassima, a town in the Apulia region (Southern Italy), has been conducted. A PaT, suitable for this application, has been tested in both direct and reverse modes at the test rig of the Department of Mechanics, Mathematics and Management of the Polytechnic University of Bari. Then, starting from the analysis of the pressure and flow rate patterns during the day and the night, three installation cases have been evaluated and compared in terms of hydraulic energy harvesting and power output useful to supply an electrical charging station.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"37 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":"123071944","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: 12

Steady and unsteady RANS simulations of heat transfer on a turbine vane endwall with inlet boundary layer skew 进口附面层倾斜涡轮叶片端壁换热的定常和非定常RANS模拟

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-119

Xing Yang, Z. Feng, T. Simon

{"title":"Steady and unsteady RANS simulations of heat transfer on a turbine vane endwall with inlet boundary layer skew","authors":"Xing Yang, Z. Feng, T. Simon","doi":"10.29008/ETC2019-119","DOIUrl":"https://doi.org/10.29008/ETC2019-119","url":null,"abstract":"In this study, steady Reynolds-averaged Navier-Stokes (RANS) and unsteady RANS (URANS) simulations in a turbine vane cascade are performed to study the effects of inlet boundary layer skew on flowfields in the vane passage and heat transfer over the endwall surfaces. The inlet skew simulates the relative movement between rotor platform and stator endwall in a turbine stage. The transverse motion of a moving wall, which is placed parallel to and upstream of the vane endwall, generates the inlet skew. An engine-like velocity profile yields a cascade inlet Reynolds number of 3.46×105. A parametric study is conducted for two moving wall-to-freestream velocity ratios (r) of 0.61 and 0.76, representing the actual operation of an engine. In addition, steady and time-averaged results are compared to address the difference of predictions in heat transfer from the steady and unsteady simulations. The results show that the effects of unsteadiness due to inherent unsteadiness in the flow and inlet skew passage on the pressures over the endwall surface is negligible. However, the unsteadiness plays an important role in determining endwall heat transfer patterns. The inlet boundary layer skew modifies the development and migration of horseshoe vortex and passage vortex, resulting in local variation of heat transfer over most endwall surfaces. Lower heat transfer coefficients are found near the suction side beyond the passage throat, but overall heat transfer levels almost remain the same on the endwall in the presence of inlet skew.","PeriodicalId":268187,"journal":{"name":"13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics","volume":"127 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":"114155456","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

Performance improvement of the CFM56-3 aircraft engine by electric power transfer CFM56-3型航空发动机的电力传输性能改进

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-004

Hossein Balaghi Enalou, S. Bozhko

{"title":"Performance improvement of the CFM56-3 aircraft engine by electric power transfer","authors":"Hossein Balaghi Enalou, S. Bozhko","doi":"10.29008/ETC2019-004","DOIUrl":"https://doi.org/10.29008/ETC2019-004","url":null,"abstract":"With the design trends towards the More Electric Engine (MEE) for the More Electric Aircraft (MEA), areas for novel technologies can be pinpointed for multi-spool engines, introducing remarkable improvements to push the boundaries of propulsion technology as it strives to create quieter and more efficient engine. Provided that a multi-spool engine is equipped with electrical machines connected to each of its shafts, using power electronics within a single high-voltage DC bus configuration, it is possible to circulate the desired amount of power between the engine shafts independent of their speeds. This paper presents an engine model which has also considered Variable Stator Vanes (VSVs) and Variable Bleed Valves (VBVs) for bleeding in order to investigate the idea of power transfer at low speed settings. Validation with test results from the CFM56-3 engine highlights an acceptable level of accuracy of the engine model. Moreover, preliminary results show that the idea of power circulation is highly desirable for low speed settings for the CFM56-3 aircraft engine. The electrical power transfer from the Low Pressure (LP) to the High Pressure (HP) shaft at engine’s low speed settings such as taxi and flight idle, helps to decrease the fuel rate and increase the available surge margin of compressors.","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":"129308987","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: 2

Investigation of the ventilation flow in a gas turbine package enclosure 燃气轮机包壳内通风流动的研究

13th European Conference on Turbomachinery Fluid Dynamics and Thermodynamics Pub Date : 1900-01-01 DOI: 10.29008/ETC2019-438

J. Kowalski, F. Mare, Sascha Theis, A. Wiedermann, M. Lange, R. Mailach

引用次数: 1