Review on counter-rotating turbomaehinery (CRT) is first presented.Then, two technique challenges on aspects of flow preswirl and off-design operation are analyzed by using velocity triangle method.

• 摘要为获得关于对转叶轮机共性问题的认识，在回顾对转叶轮机发展之后，采用速度三角形方法分析了“对转”造成的气流预旋范围和变工况运行方面的技术挑战。