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Flow-Induced Instabilities in Pump-Turbines in China

Zhigang Zuo,Shuhong Liu

Engineering 2017, Volume 3, Issue 4, Pages 504-511 doi: 10.1016/J.ENG.2017.04.010

Abstract:

The stability of pump-turbines is of great importance to the operation of pumped storage power (PSP) stations. Both hydraulic instabilities and operational instabilities have been reported in PSP stations in China. In order to provide a reference to the engineers and scientists working on pump-turbines, this paper summarizes the hydraulic instabilities and performance characteristics that promote the operational instabilities encountered in pump-turbine operations in China. Definitions, analytical methods, numerical and experimental studies, and main results are clarified. Precautions and countermeasures are also provided based on a literature review. The gaps between present studies and the need for engineering practice are pointed out.

Keywords： Pump-turbines Flow-induced instability Pressure fluctuations S-shaped characteristics Positive slopes

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Hydroelastic model experimental study on large scale high arch dam vibration by discharge flow

Ma Bin,Lian Jijian,Yang Min

Strategic Study of CAE 2008, Volume 10, Issue 11, Pages 23-29

Abstract: The equivalent load is determined by inverse analysis method for flow induced vibration, then the dynamicresponse of the dam is obtained and influence of flow-induced vibration is assessed.

Keywords： Laxiwa arch dam hydroelastic model flow-induced vibration vibration response inverse analysis

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Simulation of cross-flow-induced vibration of tube bundle by surface vorticity method

WANG Fenghao, JIANG Gedong, Lin John Zhang

Frontiers in Energy 2008, Volume 2, Issue 3, Pages 243-248 doi: 10.1007/s11708-008-0049-7

Abstract: A fluid-structure interaction model based on Surface Vorticity Method (SVM) was used to study flow-inducedThe flow-induced vibrations of four tubes in a rotated square and a staggered tube bundle in three-rowThe results also showed that when more flexible tubes are used, the flow pattern changed drasticallyand the fluid-structure interaction imposed a dominant impact on the flow.

Keywords： dominant sub-critical Reynolds staggered Vorticity three-row

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Large eddy simulation of turbulent buffet forces in flow induced vibration

XI Zhide, CHENG Bingde, LI Pengzhou

Frontiers in Energy 2008, Volume 2, Issue 4, Pages 524-527 doi: 10.1007/s11708-008-0099-x

Abstract: The pressure pulse filter and Smagorinsky sub-grid stress model of the Large Eddy Simulation (LES) are introduced. The fluid field in the annular plenum between the pressure vessel and the core barrel of the1:5 model in the second phase of Qinshan Nuclear Power Plant is simulated, and the distribution of the total pressure in the space and time domains is obtained. The results show that the Power Spectrum Density (PSD) of LES from the calculation and the test are in the same quantity order. Thus, the pressure of LES can be a load to stimulate the barrel vibration.

Keywords： Spectrum Density Smagorinsky sub-grid vibration calculation Qinshan Nuclear

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Generation and repair of AID-initiated DNA lesions in B lymphocytes

Zhangguo Chen,Jing H. Wang

Frontiers of Medicine 2014, Volume 8, Issue 2, Pages 201-216 doi: 10.1007/s11684-014-0324-4

Abstract:

Activation-induced deaminase (AID) initiates the secondary antibody diversification process in B lymphocytes

Keywords： class switch recombination somatic hypermutation activation-induced deaminase DNA repair genomic instability

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Wind resistance challenges and fundamental research on long-span bridges

Xiang Haifan,Ge Yaojun

Strategic Study of CAE 2011, Volume 13, Issue 9, Pages 8-21

Abstract: projects related to wind resistance challenges on three types of long span bridges, including flutter instabilityand control of suspension bridges, wind induced vibration of cable-stayed bridges and control of wind-raininduced cable vibration, vortex shedding vibration and control of arch bridges, and the refinementsm main span have high enough critical flutter speed, but the main aerodynamic concern is rain-wind inducedExcept one example of vortex-induced vibration, long-span arch bridges have no wind resistance problems

Keywords： suspension bridge cable stayed bridge arch bridge flutter instability buffeting response vortexinduced vibration wind-rain induced vibration

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Numerical simulations of morphological changes in barrier islands induced by storm surges and waves usinga supercritical flow model

Soumendra Nath KUIRY, Yan DING, Sam S Y WANG

Frontiers of Structural and Civil Engineering 2014, Volume 8, Issue 1, Pages 57-68 doi: 10.1007/s11709-014-0235-0

Abstract: In this paper, an advanced explicit finite volume flow model in two-dimensions is presented for simulatingThis flow model is coupled with existing wave-action model and sediment transport model.The resulting integrated coastal process model is capable of simulating flows induced by extreme conditionssuch as waves, surge tides, river flood flows, etc., and morphological changes induced by rapid coastalThis developed supercritical flow model is based on the solution of the conservative form of the nonlinear

Keywords： coastal inlet coastal process modeling supercritical flow sediment transport barrier islands

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Combustion instability detection using the wavelet detail of pressure fluctuations

JI Junjie, LUO Yonghao

Frontiers in Energy 2008, Volume 2, Issue 1, Pages 116-120 doi: 10.1007/s11708-008-0019-0

Abstract: A combustion instability detection method that uses the wavelet detail of combustion pressure fluctuations

Keywords： comparison wavelet approximation pressure transducer general pressure consistent

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Progress and Prospect of Seafloor Instability Research

Gao Weijian, Li Wei

Strategic Study of CAE 2023, Volume 25, Issue 3, Pages 109-121 doi: 10.15302/J-SSCAE-2023.03.010

Abstract:

Seafloor instability and secondary submarine geohazards are widely presentHowever, formation mechanisms and controlling factors of seafloor instability are still poorly understoodTo improve the understanding, based on the history and development of seafloor instability, thisengineering geohazards risks, and summarizes popular quantitative analysis methods for seafloor instability, this study proposed the development direction and countermeasures of future seafloor instability

Keywords： seafloor instability submarine geohazards formation mechanisms risk assessment instability analysis

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Effect of Joule heating on electro-osmotic flow in a closed-end micro-channel with isothermal and convective

Liang ZHAO, Linhua LIU,

Frontiers in Energy 2009, Volume 3, Issue 4, Pages 381-388 doi: 10.1007/s11708-009-0057-2

Abstract: The effect of Joule heating on the steady state electro-osmotic flow in a closed-end micro-channel isvelocity near the wall and an increase in fluid velocity at the central region in order to maintain a zero flowThe effect of Joule heating on the induced pressure gradient is also studied, which is very importantThe results reveal that the induced pressure gradient, taking into consideration Joule heating, is significantlyThe induced pressure gradient difference between considering Joule heating and without considering Joule

Keywords： closed-end micro-channel electrical double layer electro-osmotic flow induced pressure gradient Joule

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Size-dependent Elastic Instability of Gel CylinderWith Surface Stress

Huang Dianwu,Qiao Ling, Wang Shiji

Strategic Study of CAE 2007, Volume 9, Issue 4, Pages 50-54

Abstract:

The elastic instability of a gel cylinder was researched with classicalThe non-classic boundary condition of the elastic instability has been educed by the energy functional So a criterion equation of the elastic instability can be got.Through the analysis of the equation, it is found that the elastic instability is relevant to the radius

Keywords： gel cylinder elastic instability intrinsic scale surface effect

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Modulational Instability of Optical Vortices in Engineered Saturable Media Review

D.G. Pires, N.M. Litchinitser

Engineering 2022, Volume 17, Issue 10, Pages 31-43 doi: 10.1016/j.eng.2022.04.022

Abstract:

Propagation of light beams in turbid media such as underwater environments, fog, clouds, or biological tissues finds increasingly important applications in science and technology, including bio-imaging, underwater and free-space communication technologies. While many of these applications traditionally relied on conventional, linearly polarized Gaussian beams, light possesses many degrees of freedom that are still largely unexplored, such as spin angular momentum (SAM) and orbital angular momentum (OAM). Here, we present nonlinear light–matter interactions of such complex light beams with "rotational" degrees of freedom in engineered nonlinear colloidal media. By making use of both variational and perturbative approach, we consider non-cylindrical optical vortices, elliptical optical vortices, and higher-order Bessel beams integrated in time (HOBBIT) to predict the dynamics and stability of the evolution of these beams. These results may find applications in many scenarios involving light transmission in strongly scattering environments.

Keywords： Optical vortex Orbital angular momentum Modulation instability Turbid media

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Underlying mechanism of the hydrothermal instability of Cu

Nadeen Al-Janabi,Abdullatif Alfutimie,Flor R. Siperstein,Xiaolei Fan

Frontiers of Chemical Science and Engineering 2016, Volume 10, Issue 1, Pages 103-107 doi: 10.1007/s11705-015-1552-0

Abstract: Water induced decomposition of Cu (BTC) (BTC= benzene-1,3,5-tricarboxylate) metal-organic framework

Keywords： hydrothermal stability metal-organic framework (MOF) open metal sites (OMSs) dynamic water vapour adsorption

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Mechanisms and impacts of chromosomal translocations in cancers

Jing H. Wang

Frontiers of Medicine 2012, Volume 6, Issue 3, Pages 263-274 doi: 10.1007/s11684-012-0215-5

Abstract:

Chromosomal aberrations have been associated with cancer development since their discovery more than a hundred years ago. Chromosomal translocations, a type of particular structural changes involving heterologous chromosomes, have made a critical impact on diagnosis, prognosis and treatment of cancers. For example, the discovery of translocation between chromosomes 9 and 22 and the subsequent success of targeting the fusion product BCR-ABL transformed the therapy for chronic myelogenous leukemia. In the past few decades, tremendous progress has been achieved towards elucidating the mechanism causing chromosomal translocations. This review focuses on the basic mechanisms underlying the generation of chromosomal translocations. In particular, the contribution of frequency of DNA double strand breaks and spatial proximity of translocating loci is discussed.

Keywords： DNA double strand breaks chromosomal translocations genomic instability spatial proximity carcinogenesis

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p-Cresyl sulfate promotes the formation of atherosclerotic lesions and induces plaque instability by

Hui Han,Yanjia Chen,Zhengbin Zhu,Xiuxiu Su,Jingwei Ni,Run Du,Ruiyan Zhang,Wei Jin

Frontiers of Medicine 2016, Volume 10, Issue 3, Pages 320-329 doi: 10.1007/s11684-016-0463-x

Abstract:

Coronary atherosclerosis is a major complication of chronic kidney disease. This condition contributes to the increased mortality in dialysis patients. p-Cresyl sulfate (PCS) is a prototype of protein-bound uremic toxins that cannot be efficiently removed through routine dialysis procedures. In the present study, ApoE^−/− mice that underwent 5/6 nephrectomy were randomly divided into two groups, namely, vehicle-treated group (n = 20) and PCS-treated group (n = 20). Mice were sacrificed for en face and immunohistological analyses after 8 or 24 weeks of high-fat diet. Rat aortic vascular smooth muscle cells (VSMCs) were treated with phosphate buffer solution or 500 µmol/L PCS for in vitro evaluation. PCS-treated mice were observed to suffer increased atherosclerotic lesions after eight weeks of PCS administration. Moreover, 24 weeks of PCS administration also markedly increased the vulnerability index of aortic plaques. PCS was also observed to facilitate the migration and proliferation of VSMCs during the progression of the disease. Moreover, PCS disturbed the balance between matrix metalloproteinases and tissue inhibitor of metalloproteinases within the plaques. Thus, PCS played a vital role in promoting atherogenesis and disturbing the stability of formed plaques probably by targeting VSMCs.

Keywords： p-cresyl sulfate atherosclerosis plaque stability vascular smooth muscle cell