摘要：Performance improvement of the high-load transonic turbine is the key method of improving the thrustto-weight ratio or the power density of gas turbine engines. In order to investigate the flow behaviors inside the high load turbine cascades, a linear turbine cascade test section is designed, which enables the Schlieren photography and static pressure measurement along the cascade profile can be conducted. Variable pitch is realized in the test section to achieve different Zweifel coefficients. Due to the capability limitation of the air supplier, the test section is designed to have only5 blade channels with shortened blade height to achieve high Mach number flow conditions. Numerical investigations were carried out to investigate the wall effect and its in fluences on the flow fields inside the test section. The result indicates that the shape of the connecting part of the test section has a significant influence on the flow similarity among different blade passages. With the proper design, a good repetition flow is achieved between neighbored blade passages.

摘要：为探究中、法标高模量沥青混合料劲度模量指标相关性,寻求我国模量参数条件下的高模量沥青混合料合适模量值,更好地开展我国高模量沥青混合料的设计与评价,通过CRT-2PT梯形梁两点弯曲复数模量试验(法标)和SPT单轴压缩动态模量试验(中标),对2种评价体系下的4种典型高模量沥青混合料的劲度模量研究分析,并在满足法标高模量沥青混合料模量指标前提下,建立不同温度下复数模量与动态模量的关系转换模型,根据转换模型,推荐适于我国国情的动态模量设计取值范围。结果表明:两种评价体系得到的混合料模量和相位角主曲线整体变化趋势一致,但不同的加载方式对混合料劲度模量和相位角影响较大,混合料SPT动态模量主曲线的频域更广、模量值更大、相位角离散性小;建立了两种评价体系间不同温度下的劲度模量关系转换模型,并基于模型推荐我国高模量沥青混合料15℃、10 Hz条件下动态模量不小于16 000 MPa, 20℃、10 Hz条件下动态模量不小于14 000 MPa, 45℃、10 Hz条件下动态模量不小于2 500 MPa;结合实际道路工程中已成功应用的3种高模量沥青混合料,验证了基于模量转换模型推荐动态模量值的可靠性,结果与模型推荐值范围一致。