The tip leakage flow between rotating turbine blades and the stationary turbine casing causes aerodynamic losses and high thermal loads. Numerous novel tip geometries have been proposed for reducing both of these effects, one of them is a shelf squealer tip. The objective of this study is to investigate the aerothermal performance of three squealer blade tip configurations: conventional, vertical shelf and inclined shelf. Heat transfer was measured to analyze heat transfer features on the blade tip using transient IR thermography method. Also, computational fluid dynamics simulation and particle image velocimetry were conducted to visualize the flow characteristics around the blade tip. The experiment was conducted under conditions of a Reynolds number of 140,000 which was based on the inlet velocity in a wind tunnel. Thermal loads with vertical and inclined shelf squealer tip configurations are lower than with the conventional squealer tip. Due to the recessed pressure side rim of the vertical shelf squealer tip, the tip leakage flow was less reattached comparing to conventional squealer tips. This resulted in reduced thermal load on the tip surface and a larger tip leakage vortex around the blade suction side, which increased aerodynamic losses. Especially in the inclined shelf squealer tip, a separation bubble was generated on its inclined pressure side rim, which reduced the tip leakage flow due to the vena contracta effect. Consequentially, the reduced tip leakage flow decreased both heat loads and aerodynamic losses for the inclined shelf squealer tip. Therefore, the inclined shelf squealer tip demonstrated a good performance with respect to both aerodynamic loss and heat transfer.

旋转的涡轮叶片和固定的涡轮机壳体之间的尖端泄漏流会导致空气动力损失和高热负荷。已经提出了许多新颖的尖端几何形状来减小这两种影响，其中之一是架子式压条尖端。这项研究的目的是研究三种squealer叶片尖端构造的空气热性能：常规，垂直搁板和倾斜搁板。使用瞬态红外热成像方法测量了传热，以分析叶片尖端上的传热特征。此外，进行了计算流体动力学模拟和颗粒图像测速，以可视化叶片尖端周围的流动特性。该实验是在雷诺数为140,000的条件下进行的，该条件基于风洞中的入口速度。垂直和倾斜的架子式唱头的配置所产生的热负荷要低于传统的唱头。由于垂直架子式榨汁机吸头的凹入压力侧边缘，与传统的榨汁机吸头相比，吸头漏液的重新附着少。这导致叶尖表面上的热负荷降低，并且叶片吸力侧周围的叶尖泄漏涡旋增大，从而增加了空气动力学损失。尤其是在倾斜的架子式榨汁机吸头中，在其倾斜的压力侧边缘上产生了分离气泡，这减少了由于腔收缩效应而引起的吸头泄漏流。因此，减少的刀尖泄漏流量减少了倾斜式架子榨油机刀尖的热负荷和空气动力学损失。所以，