With increasing emphasis on renewable sources of energy, the gas turbine engine faces several challenges in evolving its design, to remain relevant. Compressor is one of the main components, which accounts for one-third of the engine length. Compressor designers have been exploring different ideas to achieve maximum pressure rise with minimum number of stages required. Tandem blading is one such novel design that has demonstrated higher diffusion capability than a single rotor blade. A single blade, with a higher diffusion factor, carries the risk of flow separation against the adverse pressure gradient of the compressor flow. In the tandem blading concept, a single blade is split into forward and aft blade. The gap that is created between the forward and aft blade, serves as a mechanism to energize the sluggish flow over the aft blade suction surface, which in turn helps in mitigating the flow separation. The present experimental work is aimed at exploring the feasibility of a tandem rotor in an axial flow compressor under the clean and radially distorted inflows. Steady and unsteady experimental results of the tandem rotor are included in this paper. The stage performance characteristics, variation of total pressure, flow coefficient, and exit flow angle along the blade span for clean and distorted flow is included in this paper. Some results of a steady Reynolds-averaged Navier-Stokes simulation are also included to give some insight into the complex flow field of the tandem rotor. Wavelet transform, fast Fourier transform analysis, and visual inspection of casing pressure traces are used to analyze the unsteady result of the tandem rotor in clean and distorted flow. The tandem rotor is able to achieve its design pressure ratio and has a stall margin of 9% under the clean flow condition. Initially, stall appears as a low-intensity spike for all the cases, which turns into a long length-scale disturbance within three rotor revolutions. A modal wave of low frequency is also observed under clean and distorted inflows.

随着对可再生能源的日益重视，燃气涡轮发动机在发展其设计以保持相关性方面面临着若干挑战。压缩机是主要部件之一，占发动机长度的三分之一。压缩机设计人员一直在探索不同的想法，以在所需的级数最少的情况下实现最大的压力上升。串联叶片就是这样一种新颖的设计，它表现出比单个转子叶片更高的扩散能力。具有较高扩散系数的单个叶片会带来流动分离的风险，以对抗压缩机流动的不利压力梯度。在串联叶片概念中，单个叶片分为前叶片和后叶片。前后叶片之间产生的间隙，作为一种机制，为后叶片吸力表面上的缓慢流动提供能量，这反过来又有助于减轻流动分离。目前的实验工作旨在探索在清洁和径向扭曲流入的轴流压缩机中串联转子的可行性。本文包括串联转子的稳态和非稳态实验结果。本文包括各级性能特征、总压力变化、流量系数和沿叶片跨度的出口流动角，用于清洁和扭曲流。还包括稳定雷诺平均 Navier-Stokes 模拟的一些结果，以深入了解串联转子的复杂流场。小波变换，快速傅立叶变换分析，套管压力痕迹的目视检查用于分析串联转子在清洁和扭曲流中的不稳定结果。串联转子能够达到其设计压力比，并且在清洁流动条件下具有9%的失速裕度。最初，失速在所有情况下都表现为低强度尖峰，在转子三转内变成长长度尺度扰动。在干净和扭曲的流入下也观察到低频的模态波。