路面免碾压贫混凝土基层工作性研究

设计了一种免碾压贫混凝土基层,它可有效保证贫混凝土基层的稳定性和平整度,同时可减少施工机械、减化施工工序、缩短周期、改善施工环境.通过研究免碾压贫混凝土基层材料,分析了影响贫混凝土工作性的因素,并提出采用维勃稠度试验作为其工作性评价方法,以及维勃稠度作为其工作性评价指标,最后,采用多因素正交设计试验,并根据极差分析和方差分析,得到评价指标维勃稠度的回归公式.结果表明,维勃稠度值能够较好地评价免碾压贫混凝土的工作性.

内掺再生砖粉湿拌砂浆综合性能研究

为了提高建筑垃圾的利用率,试验采用废弃黏土砖研磨成砖粉部分取代水泥制备再生湿拌砂浆(RWM),研究再生砖粉掺量wRBP、稠度值、胶砂比B/S对RWM保水率以及不同龄期抗压强度(fm,cu)的影响。结果表明,B/S、稠度值分别对RWM不同龄期的fm,cu、保水率影响最大,而稠度值对RWM的保水率的影响最大。B/S为1∶4、wRBP为20%、稠度在(70±10)mm时RWM 28d的fm,cu28可达到M10要求。

Numerical Study of Improving Aerodynamic Performance of Low Solidity LPT Cascade through Increasing Trailing Edge Thickness

This paper presents a new idea to reduce the solidity of low-pressure turbine(LPT) blade cascades,while remain the structural integrity of LPT blade.Aerodynamic performance of a low solidity LPT cascade was improved by increasing blade trailing edge thickness(TET).The solidity of the LPT cascade blade can be reduced by about12.5% through increasing the TET of the blade without a significant drop in energy efficiency.For the low solidity LPT cascade,increasing the TET can decrease energy loss by 23.30% and increase the flow turning angle by1.86% for Reynolds number(Re) of 25,000 and freestream turbulence intensities(FSTT) of 2.35%.The flow control mechanism governing behavior around the trailing edge of an LPT cascade is also presented.The results show that appropriate TET is important for the optimal design of high-lift load LPT blade cascades.