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Non-adiabatic flow characteristics of micro impeller

Propulsion and Power Research 2014年第1期3卷 1-8页

作者： Qianwei Sun Qiushi Li Ali Arshad Zhiping Li National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics School of Energy and Power EngineeringBeihang UniversityBeijing 100191China

Non-adiabatic working condition is one of the major causes of performance deterioration in micro gas turbine *** micro scale geometry,low Reynolds number operating condition and high surface to volume ratio all lead to severe heat *** paper first established a simple heat transfer model to determine appropriate non-adiabatic boundary condition for computational fluid dynamics(CFD)*** wall temperature is identified as a heat transfer boundary based on model analysis in combination with material selection for pre-design of the engine and verified by the experiment carried out on directed structure applied in the model.A series of numerical simulations with adiabatic and non-adiabatic boundary conditions is then carried out to study the flow characteristics of high speed,low Reynolds number micro *** physical nature for significant performance degradation related to flow behavior changes due to heat transfer effect is revealed by detailed analysis of typical flow features extracted from the comparative *** result established the basis for heat transfer modeling of micro impeller purposing implications for design modification in order to attain high efficiency and better performance.

关键词： Non-adiabatic Micro impeller root separation Tip clearance flow Slip factor

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Response of Yield,Microbial Community Composition and Soil Respiration in Rhizosphere of Rape Intercropped with Chinese Milk Vetch

Response of Yield,Microbial Community Composition and Soil R...

引用

2016年全国青年作物栽培与生理学术研讨会

作者：周泉王龙昌西南大学农学与生物科技学院

【Background】In the context of global warming,the management of agricultural carbon emissions has become more and more imperative,and green manuring has great potential to curb agricultural carbon *** present study aimed at investigating the role of Chinese milk vetch intercropping with rape to enhance the soil productivity and suppress the carbon emission impact in purple soil region of Southwest,China.【Materials and Methods】 A series of pot experiments included three root separation methods and two straw mulching methods,were employed to explore the soil properties,rape growth,the soil microorganism and the soil respiration in response to Chinese Milk ***】 The intercropping green manure(Chinese milk vetch) substantially decreased the organic carbon content and the total PLFA(phospholipid fatty acid) in rape rhizosphere,and strongly inhibited the growth of anaerobic *** addition,the structure of soil microbial community in rape straw mulching rhizosphere also changed greatly,which was significantly correlated with 16:lw9c and 18:3w6c(6,9,12).During the rape cultivation,Chinese milk vetch considerably inhibited the elevation of soil temperature and decreased the soil carbon flux in rape *** soil respiration presented the general trend of fall-rise-fall and a cubic curve relationship with soil *** was proved that soil respiration was positively correlated with soil temperature in a certain range,and it was also closely related to the crop growth.【Conclusions】 Our findings revealed that Chinese milk vetch as a green manure may be helpful to manage the agricultural carbon emissions,increase soil productivity,improve the structure of soil microbial community and suppress carbon emissions.

关键词： root interaction straw mulching root separation soil microorganism carbon emission

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