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不同养老模式下失能老年人生活质量及影响因素分析

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中国初级卫生保健 2024年第2期38卷 51-54页

作者：沈凌许雁集周琴华上海市黄浦区老西门街道社区卫生服务中心上海200010

目的:调查分析不同养老模式下不同失能程度老年人的生活质量状况及影响因素。方法:2022年3月—2023年3月以上海市黄浦区老西门街道社区卫生服务中心为中心利用等距抽样的方法,分别于不同方位抽取5个社区,随机选取180名居家失能老年人进... 详细信息

目的:调查分析不同养老模式下不同失能程度老年人的生活质量状况及影响因素。方法:2022年3月—2023年3月以上海市黄浦区老西门街道社区卫生服务中心为中心利用等距抽样的方法,分别于不同方位抽取5个社区,随机选取180名居家失能老年人进行研究。其中,接受医养融合养老模式的老年人84人(医养组),未接受者96人(非医养组)。依据《老年人能力评估》(MZ/T 039—2013)标准对所有老年人的失能程度进行分级,其中医养组轻、中、重度失能老年人分别有41人、28人、15人,非医养组轻、中、重度失能老年人分别有47人、31人、18人,对比组间及组内不同失能程度老年人的生活质量。同时依据世界卫生组织生存质量测定简表对老年人生活质量进行评分,对影响老年人生活质量的因素进行多元线性回归分析。结果:医养组轻、中、重度失能老年人生活质量评分高于非医养组,差异有统计学意义(t值分别为7.464、2.503、2.919,P值均3种、每周出门次数≤2次为影响老年人生活质量的独立危险因素。结论:医养融合养老模式下不同程度失能老年人间的生活质量评分具有差异性,但均高于非医养融合养老模式下失能老年人的生活质量评分,且住所无电梯、慢性病种类多、每周出门次数少为影响老年人生活质量的独立危险因素。

关键词：老年人失能医养融合养老模式影响因素生活质量

Study on Aerodynamic Design Optimization of Turbomachinery Blades

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Journal of Thermal Science 2005年第4期14卷 298-304,320页

作者： Naixing CHEN Hongwu ZHANG Weiguang HUANG yanji xu Institute of Engineering Thermophysics Chinese Academy of Sciences EO. Box 2706 Beijing 100080China

This paper describes the study on aerodynamics design optimization of turbomachinery blading developed by the authors at the Institute of Engineering Thermophysics, Chinese Academy of Sciences, during the recent few years. The present paper describes the aspects mainly on how to use a rapid approach of profiling a 3D blading and of grid generation for computation, a fast and accurate viscous computation method and an appropriate optimization methodology_ including a blade parameterization algorithm to optimize tm-bomachinery blading aerodynamically. Any blade configuration can be expressed by three curves, they are the camber lines, the thickness distributions and the radial stacking line, and then the blade geometry can be easily parameterized by a number of parameters with three polynomials. A gradient-based parameterization analytical method and a response surface method were applied herein for blade optimization. It was found that the optimization process provides reliable design for turbomachinery with reasonable computing time.

关键词： aerodynamic design optimization response surface method blade parameterization 3D aerodynamics of turbomachinery.

Non-equilibrium Plasma Assisted Combustion of Low Heating Value Fuels

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Journal of Thermal Science 2013年第3期22卷 275-281页

作者： Hongbin Hu Quanbin Song yanji xu Gang Li Chaoqun Nie Institute of Engineering Thermophysics Chinese Academy of Sciences

This paper describes the effects of non-equilibrium air plasma generated by a dielectric barrier discharge (DBD) on the combustion of low heating value fuels. The experimental results indicate that addition of a very small amount of energy to the air flow in the form of DBD significantly improves the flame stability. Moreover, main combustion characteristics such as flame propagation speed, combustion intensity and lean blow-off limits are also enhanced by the effect of plasma. Some active radicals such as excited O atom and excited N2 molecule are observed by spectrograph in the discharge area. Based on the results of numerical investigation we can conclude that these active radicals generated in discharge area can accelerate the production rate of active OH radical which plays a key role in the oxidation process of low heating value fuel, and thus the whole combustion process is accelerated.

关键词： Low heating value fuels Non-equilibrium plasma Combustion stability Active radicals

Investigation of Coal Fueled Chemical Looping Combustion Using Fe_3O_4 as Oxygen Carrier:Influence of Variables

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Journal of Thermal Science 2010年第3期19卷 266-275页

作者： Xiaoyan Sun Wenguo Xiang Sha Wang Wendong Tian Xiang xu yanji xu Yunhan Xiao School of Energy and Environment Southeast University Nanjing 210096 China Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100080 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai 200240 China

Chemical-looping combustion (CLC) is a novel combustion technique with inherent CO2 *** (Fe3O4) was selected as the oxygen *** coal (Inner Mongolia,China),straw coke and natural coke were used as fuels for this *** of operation temperatures,coal to Fe3O4 mass ratios,and different kinds of fuels on the reduction characteristics of the oxygen carrier were investigated using an atmosphere thermogravimetric analyzer (TGA).Scanning electron microscopy (SEM) was used to analyse the characteristic of the solid *** results shown that the reaction between the coal and the oxygen carrier become strong at a temperature of higher than 800℃.As the operation temperature rises,the reduction conversion rate *** the temperatures of 850oС,900℃,and 950℃,the reduction conversion rates were 37.1%,46.5%,and 54.1% ***,SEM images show that at the temperature of higher than 950℃,the iron oxides become melted and *** possible operation temperature should be kept around 900℃.When the mass ratios of coal to Fe3O4 were 5/95,10/90,15/85,and 20/80,the reduction conversion rates were 29.5%,40.8%,46.5%,and 46.6% *** the increase of coal,the conversion rate goes *** there exist an optimal ratio around 15/*** based on different kinds of fuels show that the solid fuel with a higher volatile and a more developed pore structure is conducive to the reduction reactivity of the oxygen carrier.

关键词： chemical-looping combustion CO2 separation magnetite

Low Speed Axial Compressor Stall Margin Improvement by Unsteady Plasma Actuation

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Journal of Thermal Science 2014年第2期23卷 114-119页

作者： LI Gang xu yanji YANG Lingyuan DU Wei ZHU Junqiang NIE Chaoqun Institute of Engineering Thermophysics Chinese Academy of Sciences

This research investigates the use of single dielectric barrier discharge(SDBD) actuators for energizing the tip leakage flow to suppress rotating stall inception and extend the stable operating range of a low speed axial compressor with a single *** jet induced by the plasma actuator adds momentum to the flow in the tip region and has a significant impact on the tip-gap *** are carried out on a low speed axial compressor with a single *** static pressure is measured at both the rotor inlet and *** flow coefficient and pressure rise coefficient are *** the characteristic line is acquired to show the overall performance of the *** unsteady plasma actuation of 18kV and 60W the compressor stability range improvement is realized at rotor speed of 1500 r/min – 2400 r/min.

关键词： axial compressor plasma actuation stall margin improvement

Experimental Investigation of Dynamic and Emission Characteristics of a DLE Gas Turbine Combustor

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Journal of Thermal Science 2013年第2期22卷 180-185页

作者： Shuangxi Xing Aibing Fang Quanbin Song Yufeng Cui yanji xu Chaoqun Nie Institute of Engineering Thermophysics Chinese Academy of Sciences

The DLE (dry low emission) technology has already been used on industrial gas turbine combustor and the NO X emission can be limited to 25 ppmv (@15% O 2 ), but one of the destructive effects is combustion instability. In this paper, the dynamic and emission characteristics of a DLE gas turbine combustor have been researched in the authors' laboratory, and the results show that the key source of combustion instability is the non-uniformity of fuel in the flame zone. Two main fuel supply methods have been used to form different fuel distribution types; it is shown that in the perfectly premixed case the emission level is low and combustion process is stable. The PPF also has an obvious effect on the combustor's emission and dynamic characteristics.

关键词： Dry low emission combustion instability numerical simulation experimental research

Control of endwall secondary flow in a compressor cascade with dielectric barrier discharge plasma actuation

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Science China(Technological Sciences) 2009年第12期52卷 3715-3721页

作者： LI Gang xu yanji LIN Bin ZHU JunQiang NIE ChaoQun MA HongWei WANG ZhaoFeng Laboratory of Advanced Energy and Power Institute of Engineering ThermophysicsChinese Academy of SciencesBeijing 100190China Beijing University of Aeronautics and Astronautics Beijing 100083China

Three dielectric barrier discharge plasma actuators were mounted at the positions of 20%,40%and 60%of chord length on the endwall in a compressor *** downstream flow field of the cascade has been measured with a mini five-hole pressure probe with and without the plasma *** measured results show that the plasma actuation most effectively reduces total pressure loss and flow blockage when the actuators are operated *** each of the actuators is operated independently,the actuator at the position of 20%of chord length most effectively reduces flow blockage, and the actuator at the position of 60%of chord length fairly reduces total pressure ***, negative pressure loss reduction occurs with the plasma actuator at the position of 40%of chord *** brief,the plasma actuation placed on the endwall in the cascade apparently influences the endwall secondary flow,and the optimal locations and strength of actuation are critical for the control of endwall secondary flow in a compressor cascade with the plasma actuators.

关键词： plasma actuation compressor cascade secondary flow flow control

Swirl diffusion flame control by the plasma swirler

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Science China(Technological Sciences) 2011年第7期54卷 1820-1825页

作者： LI Gang SHAO WeiWei xu yanji HU HongBin LIU Yan NIE ChaoQun ZHU JunQiang Key Laboratory of Advanced Energy and Power Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China

In this paper, the design of plasma swirler is presented in detail. The experiments were carded out to verify the feasibility of using plasma swirler to control diffusion flame. The plasma swider consists of multiple electrodes with staggered arrangement on both sides of combustor＇s expansion section. The plasma swirler can enhance combustion stability through ionizing the air to produce active free radical and promoting the swirling air. In the experiments, the flame response to the plasma swider was examined with OH distribution by planar laser induced fluorescence （PLIF）. The experimental results showed that the flame reaction zone was broadened with the increase of the plasma exciting, and this demonstrated that the plasma swirler could be used to control diffusion flame. The design of plasma swirler is feasible.

关键词： plasma swirler combustion control swirl diffusion flame

A Study of 3D Aerodynamic Design for a Transonic Compressor Blading Optimized by the Locations of Aerofoil Maximum Thickness and Maximum Camber

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Journal of Thermal Science 2003年第3期12卷 198-203页

作者： Naixing Chen Hongwu Zhang yanji xu Weiguang HuangInstitute of Engineering Thermophysics, Chinese Academy of Sciences, P.O. Box 2706, Beijing 100080, Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing China

A design procedure for improving the efficiency of a transonic compressor blading was proposed based on a rapid generation method for three-dimensional blade configuration and computational meshes, a three-dimensional Navier-Stokes solver and an optimization approach. The objective of the present paper is to design a transonic compressor blading optimized only by selection of the locations of maximum camber and maximum thickness for the airfoils at different span heights and to study how do these two design parameters affect the blade performance. The blading configuration and the computational meshes can be obtained very rapidly for any given combination of maximum camber and maximum thickness. The computational grid system generated is used for the Navier-Stokes solution to predict adiabatic efficiency, total pressure ratio and flow rate. As a main result of the optimization, adiabatic efficiency was successfully improved.

关键词： axial transonic compressor 3D aerodynamic design optimization N.S. solver rapid generation of computational meshes