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后导叶安装角对动调轴流风机性能影响研究 被引量:2
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作者 陈得胜 魏萌 +1 位作者 闫宏 王引珠 《热力发电》 CAS 北大核心 2020年第12期120-127,共8页
以自主设计的单级动调轴流模型风机为研究对象,在动叶角度为0°工况下利用数值和实验方法研究了后导叶安装角度对风机性能的影响。结果表明:后导叶安装角负向偏转(α=–40°)会显著降低模型风机和叶轮级的性能;与后导叶正常状... 以自主设计的单级动调轴流模型风机为研究对象,在动叶角度为0°工况下利用数值和实验方法研究了后导叶安装角度对风机性能的影响。结果表明:后导叶安装角负向偏转(α=–40°)会显著降低模型风机和叶轮级的性能;与后导叶正常状态相比,后导叶安装角度异常会导致模型风机全压系数最高降低35.3%,模型风机效率最高降低28.9%;在模型风机最高效运行点(φ=0.19),后导叶安装角度异常会导致模型风机叶轮级全压系数降低27.2%,模型风机叶轮级效率降低24.9%;后导叶负向偏转性能优于后导叶正向偏转性能。 展开更多
关键词 单级动调 轴流风机 后导叶 安装角 全压系数 效率 流动损失
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Upper bound solutions of stability factor of shallow tunnels in saturated soil based on strength reduction technique 被引量:8
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作者 黄阜 张道兵 +1 位作者 孙志彬 金启云 《Journal of Central South University》 SCIE EI CAS 2012年第7期2008-2015,共8页
Based on the upper bound theorem of limit analysis,the factor of safety for shallow tunnel in saturated soil is calculated in conjunction with the strength reduction technique.To analyze the influence of the pore pres... Based on the upper bound theorem of limit analysis,the factor of safety for shallow tunnel in saturated soil is calculated in conjunction with the strength reduction technique.To analyze the influence of the pore pressure on the factor of safety for shallow tunnel,the power of pore pressure is regarded as a power of external force in the energy calculation.Using the rigid multiple-block failure mechanism,the objective function for the factor of safety is constructed and the optimal solutions are derived by employing the sequential quadratic programming.According to the results of optimization calculation,the factor of safety of shallow tunnel for different pore pressure coefficients and variational groundwater tables are obtained.The parameter analysis shows that the pore pressure coefficient and the location of the groundwater table have significant influence on the factor of safety for shallow tunnel. 展开更多
关键词 strength reduction technique upper bound theorem pore pressure shallow tunnel factor of safety
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