检索结果-南通市图书馆

Numerical Analysis of the Tip Leakage Flow Field in a Transonic Axial Compressor with Circumferential Casing Treatment

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2010年第3期19卷 198-205页

作者： G.Legras N.Gourdain i.trebinjac LMFA-UMR CNRS 5509 Ecole Centrale de Lyon /Université Lyon 1 /INSA69134EcullyFrance CERFACS Computational Fluid Dynamics Team31057ToulouseFrance

This paper reports on numerical investigations aimed at understanding the influence of circumferential casing grooves on the tip leakage flow and its resulting vortical *** results and conclusions are based on steady state 3D numerical simulations of the well-known transonic axial compressor NASA Rotor 37 near stall operating *** calculations carried out on the casing treatment configuration reveal an important modification of the vortex topology at the rotor tip *** grooves limit the expansion of the tip leakage vortex in the direction perpendicular to the blade chord,but generate a set of secondary tip leakage vortices due to the interaction with the leakage mass ***,a deeper investigation of the tip leakage flow is proposed.

关键词：叶尖泄漏涡轴流压缩机数值分析套管跨音速治疗流场美国宇航局

An Experimental Description of the Flow in a Centrifugal Compressor from Alternate Stall to Surge

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2017年第4期26卷 289-296页

作者： V.Moenne-Loccoz i.trebinjac E.Benichou S.Goguey B.Paoletti P.Laucher Safran Helieopter Engines Av.Joseph Szydlowsky 64511 BordesFrance Laboratoire de Mecanique des Fluides et d'Acoustique UMR CNRS 5509Ecole Centrale de LyonUCBLyonINSA36 av.Guy de Collongue69134 Ecully CedexFrance FRATECH RP S.A.S Seconded to BELGATECH Engineering ServicosSP Woluwe Gate Boulevard de la Woluwe-laan21150 BrusselsBelgium

The present paper gives the experimental results obtained in a centrifugal compressor stage designed and built by SAFRAN Helicopter Engines. The compressor is composed of inlet guide vanes, a backswept splittered unshrouded impeller, a splittered vaned radial diffuser and axial outlet guide vanes. Previous numerical simulations revealed a particular S-shape pressure rise characteristic at partial rotation speed and predicted an alternate flow pattern in the vaned radial diffuser at low mass flow rate. This alternate flow pattern involves two adjacent vane passages. One passage exhibits very low momentum and a low pressure recovery, whereas the adjacent passage has very high momentum in the passage inlet and diffuses efficiently. Experimental measurements confirm the S-shape of the pressure rise characteristic even if the stability limit experimentally occurs at higher mass flow than numerically predicted. At low mass flow the alternate stall pattern is confirmed thanks to the data obtained by high-frequency pressure sensors. As the compressor is throttled the path to instability has been registered and a first scenario of the surge inception is given. The compressor first experiences a steady alternate stall in the diffuser. As the mass flow decreases, the alternate stall amplifies and triggers the mild surge in the vaned diffuser. An unsteady behavior results from the interaction of the alternate stall and the mild surge. Finally, when the pressure gradient becomes too strong, the alternate stall blows away and the compressor enters into deep surge.

关键词：实验测量流动模式离心压气机失速喘振离心压缩机叶片扩压器导向叶片

An Extraction of the Dominant Rotor-Stator interaction Modes by the Use of Proper Orthogonal Decomposition (POD)

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2006年第2期15卷 109-114页

作者： i. trebinjac N. ROCHUON G. BiLLONNET Ecole Centrale de Lyon Laboratoire de Mécanique des Fluides et d'Acoustique UMR CNRS 5509 69131 Ecully Cedex France ONERA Département d'Aérodynamique Appliquée 92322 Chtillon Cedex France

合适的直角的分解方法在转子定子以内被用于即时速度地一台高速度的高压的离心的压缩机的内部排的区域。处理数据来自实验和数字模拟。与 Fourier 变换比较， POD 为两块起始的地给最好的形式的近似，以在要考虑的模式的任何给定的数字... 详细信息

合适的直角的分解方法在转子定子以内被用于即时速度地一台高速度的高压的离心的压缩机的内部排的区域。处理数据来自实验和数字模拟。与 Fourier 变换比较， POD 为两块起始的地给最好的形式的近似，以在要考虑的模式的任何给定的数字上表示的精力：到速度地的活动范围 98% 全部的精力，邮政部门模式的要求的数字比 Fourier 泛音的数字低多达九倍。单个邮政部门模式被给并且证明不稳定的转子定子相互作用已经是在第一个模式的现在。关键词转子定子相互作用 - 合适的直角的分解 -

关键词：转子定子交互作用固有正交分解 POD 正交分解法离心式压气机

L2F Anemometry Measurements of the inter-Row FlowField Within a Transonic Axial Compressor Providedwith Curved Windows

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 1999年第3期8卷 166-175页

作者： Xavier Ottavy isabelle trebinjac Andre Vouillarmet(Laboratoire de Mecanique des Fluides et d’Acoustique UMR CNRS 5509/ECL/UCB Lyon iEcole Centrale de Lyon, 69131 Ecully Cedex, France) Laboratoire de Mécanique des Fluides et d’Acoustique UMR CNRS 5509/ECL/UCB Lyon i Ecole Centrale de Lyon Ecully Cedex France

iNTRODUCTiONMultibladerowcalculationscanbeperformedusingsteady3***--planeapproachneedsthetangentialaver***... 详细信息

iNTRODUCTiONMultibladerowcalculationscanbeperformedusingsteady3***--planeapproachneedsthetangentialaver***...

关键词：空气压缩机风速测量曲线窗形

Application of an Analytical Method to Locate a Mixing Plane in a Supersonic Compressor

在线全文

学校读者我要写书评

暂无评论

Journal of Energy and Power Engineering 2015年第1期9卷 91-101页

作者： Emmanuel Benichou isabelle trebinjac Turbomeca Groupe SAFRAN Bordes 64511 France Laboratoire de Mecanique des Fluides et d'Aeoustique UMR CNRS 5509 Ecole Centrale de Lyon Ecully Cedex 69134 France

in order to achieve greater pressure ratios, compressor designers have the opportunity to use transonic configurations. in the supersonic part of the incoming flow, shock waves appear in the front part of the blades and propagate in the upstream direction. in case of multiple blade rows, steady simulations have to impose an azimuthal averaging (mixing plane) which prevents these shock waves to extend upstream. in the present paper, several mixing plane locations are numerically tested and compared in a supersonic configuration. An analytical method is used to describe the shock pattern. it enables to take a critical look at the CFD (computational fluid dynamics) steady results. Based on this method, the shock losses are also evaluated. The good agreement between analytical and numerical values shows that this method can be useful to wisely forecast the mixing plane location and to evaluate the shift in performances due to the presence of the mixing plane.

关键词：平面位置超音速压缩机混合应用计算流体力学数字测试冲击波

Assessment and Feedback

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Chemistry and Chemical Engineering 2014年第10期8卷 1001-1007页

作者： Olivera Novitovic Aleksandar Novitovic Divna trebinjac Department of Enviromental Protection Business Technical College of Vocational Studies in Uziee Uzice 31000 Serbia Godthaab Helse-og Rehabilitering Center Oslo 0104 Norway

Assessment and learning must not be considered as two separate processes. in fact, assessment is an integral part of the learning process; it can be learning experience in itself. Active assessment strategies help students better understand the content they learn and develop skills that will be useful to them throughout their lives. Some of those skills are the ability to prepare effective oral and written reports and the ability to cooperate successfully with peers. Action research represents the process of systematic inquiry and it helps teachers to assess learning from the perspective of what they do in the classroom. The purpose is to find out "why" or "how" something happened the way it did. Therefore, a situation or problem should be carefully examined by a teacher. Teachers should analyze their own beliefs, values, and assumptions about teaching and learning, knowledge and curriculum, and how these impact the way they interact with students. Feedback should be used as part of assessment activities. Learning experience of students facilitated by teachers can be assessed through feedback.

关键词：评估策略反馈学习过程组成部分书面报告合作成功行动研究评估活动