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Experimental and computational investigation on flow characteristics of rotating cavities with high inlet pre-swirl axial throughflow

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Chinese Journal of Aeronautics 2024年第4期37卷 276-293页

作者： Sipeng WANG Xiang LUO Linji GUO Zeyu WU Yang BAI Zongchao LI lichun ma School of Energy and Power Engineering Beihang UniversityBeijing 100191China Research Institude of Aero-Enigine Beihang UniversityBeijing 100191China National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics Beihang UniversityBeijing 100191China Shenyang Aeroengine Research Institute Aero Engine Corporation of ChinaShenyang 110015China

As an integral part of the internal air system of aero-engines,the axial throughflow of the cooling air can interact with the cavity flow between the rotating compressor disks,forming a threedimensional,unsteady,and unstable flow *** flow characteristics in an engine-like rotating multi-stage cavity with throughflow were investigated using particle image velocimetry,flow visualization technology and three-dimensional unsteady Reynolds-Averaged Navier-Stokes (RANS)*** focus of current research was to understand the distribution of the mean swirl ratio and its variation with a wide range of non-dimensional parameters in the co-rotating cavity with high inlet pre-swirl axial *** maximum axial Reynolds number and rotational Reynolds numbers could reach 4.41×10^(4)and 1.24×10^(6),*** velocity measurement results indicate that the mean swirl ratio is greater than 1 and decreases with an increase in the radial *** flow structure is dominated by the Rossby number,and two different flow patterns (flow penetration and flow stratification) are identified and confirmed by flow visualization *** the absence of buoyancy,the flow penetration caused by the precession of the throughflow makes it easier for the throughflow to reach a high radius *** consistency of results between measurements and numerical calculations is *** study provides a theoretical basis and data support for toroidal vortex breakdown,which is of practical significance for the design of high-pressure compressor cavities.

关键词： Compressor Axial throughflow Rotating cavity flow Particle image velocimetry Unsteady RANS Flow pattern

Roles of γδ T cells in the hepatocellular carcinoma

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Cancer Biology & Medicine 2018年第S1期15卷 5-6页

作者： Na Zhao Hien Dang lichun ma Xinwei Wang The Liver Carcinogenesis Section Laboratory of Human CarcinogenesisCenter for Cancer ResearchNational Cancer InstituteBethesdaMarylandUSA Tianjin Medical University General Hospital TianjinChina

Objective:Patients with hepatocellular carcinoma(HCC)suffer from a poor survival rate and a high incidence of postoperative recurrence.γδT cells are known to detect and react to chronic inflammation,which is intimat... 详细信息

关键词： Roles cells carcinoma

An Attempt to Date the Salt-mounds in the Lop Nor Playa

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 231-232页

作者： ma lichun TANG Qingfeng ZHANG Qi KONG Deyong MLR Key Laboratory of Metallogeny and Mineral Assessment Institute of Mineral ResourcesCAGS Beijing Centre for Physical & Chemical Analysis

1 Introduction The Lop Nor playa,located in the eastern end of the Tarim Basin,capped with a thick salt crust covering an area of approximately 5,500 km2(ma 2007)that closely resembles a"Great Ear"in satellite *** the... 详细信息

关键词： An Attempt to Date the Salt-mounds in the Lop Nor Playa

Water Absorption Capcapability and Moisture Content Seasonal Changing of Salt-Crust in Lop Nur Dry Lake

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Acta Geologica Sinica(English Edition) 2014年第S1期88卷 183-184页

作者： KONG Deyong LI Baoguo ma lichun JIANG Ping'an WU Hongqi LIU Hongpeng College of Resources and Environment China Agricultural University Institute of Mineral Resources Chinese Academy of Geological Sciences College of Grassland and Environment Science Xinjiang Agricultural University

The Lop Nur dry salt lake,Xinjiang province,is charactered by typical physiognomy salt-crust,located *** and *** thickness of salt-crust is about from 20 cm to 100 cm,and

关键词： Lop Nur Dry Lake Salt-Crust Moisture Content Water Absorption Capcapability

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罗布泊干盐湖第四纪环境演变研究进展

地球科学进展 2022年第2期37卷 149-164页

作者：张瑜马黎春王凯中国地质科学院矿产资源研究所自然资源部盐湖资源与环境重点实验室北京100037 中国地质大学(北京) 北京100083

罗布泊干盐湖作为塔里木盆地唯一的尾闾湖,经历了淡水湖—微咸水湖—咸水湖—盐湖—干盐湖的演化历程,是亚洲内陆环境演化及全球气候变化研究的天然实验室。简要概述罗布泊第四纪沉积特征及环境变化过程,并对未来研究提出展望。罗布泊... 详细信息

罗布泊干盐湖作为塔里木盆地唯一的尾闾湖,经历了淡水湖—微咸水湖—咸水湖—盐湖—干盐湖的演化历程,是亚洲内陆环境演化及全球气候变化研究的天然实验室。简要概述罗布泊第四纪沉积特征及环境变化过程,并对未来研究提出展望。罗布泊早更新世主要为河流三角洲—滨浅湖—湖泊等沉积环境,是罗布泊盆地第四纪时期最为湿润的时期。自早更新世末期进入以含石膏粉砂黏土为主的咸水湖沉积阶段,中更新世中期罗北凹地进入巨量钙芒硝沉积阶段,干旱程度加剧,指示常年性盐湖亚环境。罗布泊全新统底部发育含石膏黏土、砂岩,表层广泛发育石盐壳,指示全新世伊始,罗布泊气候经历了一个相对湿润期,其北部逆向演化至咸水湖阶段,波动至半干旱气候,而后又向极端干旱气候转变,最终演化为干盐湖环境。展望未来,罗布泊古环境研究主要有以下几方面的内容需要进一步深入:①Ca-Cl型卤水对盐湖沉积亚环境综合判别的影响研究;②高精度地层时代框架;③可替代性环境演化载体;④定量化环境演变研究。

关键词：盐湖沉积环境演变罗布泊干盐湖

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Stability Investigation on the Thin Films in Capillary

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Journal of Thermal Science 2001年第2期10卷 159-163,169页

作者： Zhang lichun ma Tongze Ge Xinshi Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100080, China Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China, Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei China Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing China

The stability of the thin liquid film in a capillary is important to the phase-change heat transfer process in miniature or micro structures. From the basic equations for motion and heat transfer at the interface of the film, its stability is theoretically studied. With evaluation of the effects and relative magnitudes of various driving forces and with the use of long-wave theory in addition to linear stability analysis, the controlling equations are simplified and an evolution equation for the film’s thickness is obtained. Detailed analysis on the evolution equation shows that instability occurs first in the meniscus region and the instability condition varies with boundary conditions, geometrical scales and thermal properties. The numerical results ape well with earlier ones with some favorable extensions and improvements.

关键词： capillary thin liquid film stability non-linear..

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新疆罗布泊富钾卤水矿床异常富集机理

地球科学 2022年第1期47卷 72-81页

作者：马黎春王凯张瑜汤庆峰孙明光中国地质科学院矿产资源研究所自然资源部盐湖资源与环境重点实验室北京100037 北京市理化分析测试中心北京100089

罗布泊是世界上最大的单体硫酸盐型液体钾盐矿床,对于其矿床成因一直存在争议.基于大量盐泉、地下潜水及地表水的化学实测数据,从水文化学的角度探讨罗布泊富钾卤水矿床成因.结果表明,矿区富钾卤水钠氯系数为0.76~1.24,钾氯系数为38.58~... 详细信息

罗布泊是世界上最大的单体硫酸盐型液体钾盐矿床,对于其矿床成因一直存在争议.基于大量盐泉、地下潜水及地表水的化学实测数据,从水文化学的角度探讨罗布泊富钾卤水矿床成因.结果表明,矿区富钾卤水钠氯系数为0.76~1.24,钾氯系数为38.58~60.49,主体表现为溶滤型卤水特征,指示有其他来源卤水混合参与成矿;首次在罗布泊东部断裂带发现Ca-Cl型卤水,具有典型的富Na^(+)、K^(+)、Ca^(2+)、Cl^(‒),贫HCO_(3)^(‒)、CO_(3)^(2‒)、SO_(4)^(2‒)特征,指示罗布泊有深部热液流体补给.在成矿过程中,Ca-Cl型卤水通过“兑卤”效应,直接改变原有成矿卤水成分及结晶路线,使其矿化度升高,而且富K、Na.改造后的富“钠”卤水与前期生成的石膏(CaSO_(4)·2H_(2)O)反应,生成钙芒硝(Na_(2)Ca(SO_(4))_(2)·2H_(2)O),并赋存于多孔的钙芒硝晶间,形成超常高矿化度富钾卤水矿床.

关键词：罗布泊钾盐矿床富钾卤水富集机理卤水化学矿床学

聚乙烯装置排放气回收系统技术改造及效果评价

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能源科技 2021年第6期19卷 76-78页

作者：马立春国家能源集团宁夏煤业有限责任公司烯烃二分公司宁夏灵武750411

针对装置实际运行过程中出现的排放气压缩机一级入口缓冲罐前过滤器堵塞频率过高,容易造成排放气压缩机一级入口压力低联锁跳车,导致排放气不能正常回收,在压缩机停机检修期间造成乙烯、异戊烷、丁烯-1等原料大料浪费的问题,国家能源集... 详细信息

针对装置实际运行过程中出现的排放气压缩机一级入口缓冲罐前过滤器堵塞频率过高,容易造成排放气压缩机一级入口压力低联锁跳车,导致排放气不能正常回收,在压缩机停机检修期间造成乙烯、异戊烷、丁烯-1等原料大料浪费的问题,国家能源集团宁夏煤业有限责任公司烯烃二分公司技术人员提出了一套简单易行的技术改造方案,通过装置实际改造实施,最终避免了排放气压缩机联锁跳车。本文对此项技术改造进行阐述及效果评价,这样做不仅降低了装置聚乙烯产品生产成本,创造了经济效益,而且为装置连续安全平稳运行提供了保障,有利于环境保护。

关键词：聚乙烯装置排放气回收技术改造效果评价

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连动式研究综述

贵州教育学院学报 2007年第6期23卷 83-85页

作者：马立春贵州教育学院中文系贵州贵阳550003

连动式是古今汉语一种重要的句式,对连动式的研究从三个平面的角度作一个综述,有利于发掘出连动式需要进一步探讨的问题。

关键词：连动式句法结构语义关系语用平面