Distributed aircraft propulsion has renewed the interest in power-dense, high-efficiency power packs. Ceramic turbomachinery could be a major enabler, although no successful design has been achieved in microturbine rotors. Rotor blade loading is tensile and a hurdle for successful conversion to ceramics. The inside-out ceramic turbine (ICT) rotor uses the superior compressive properties of monolithic ceramics by supporting ceramic blades against a structural composite rotating shroud. This enables low stress levels throughout the blade, increasing reliability and extending service life. An experimental demonstration of two ICT designs was conducted with 15-kW scale prototypes to identify critical issues: design A, a flexible hub that clamps blades against the structural shroud and design B, a sliding-blade configuration that allows free displacement of the blade. The flexible-hub design was tested up to $1000°\mathrm{C}$. Rotor integrity was preserved, but local blade cracking occurred. The sliding-blade design was successfully tested up to $1100°\mathrm{C}$ for over 1 hour at a tip speed of $350\mathrm{m}/\mathrm{s}$ with no issue. Tensile loading at the ceramic/metallic interfaces remains the key challenge to address. Reducing friction should overcome blade cracking and allow the proposed ICT to reach the targeted temperature of $1275°\mathrm{C}$ and tip speed of $425\mathrm{m}/\mathrm{s}$.

分布式飞机推进技术重新引起了人们对高功率、高效率动力组的兴趣。陶瓷涡轮机械可能是一个主要的推动因素，尽管在微型涡轮转子中尚未实现成功的设计。转子叶片载荷具有张力，是成功转换为陶瓷的障碍。由内而外的陶瓷涡轮 (ICT) 转子通过将陶瓷叶片支撑在结构复合材料旋转罩上，从而利用整体陶瓷的卓越压缩性能。这使得整个叶片的应力水平较低，从而提高了可靠性并延长了使用寿命。使用 15 kW 规模原型对两种 ICT 设计进行了实验演示，以确定关键问题：设计 A，将叶片夹在结构护罩上的柔性轮毂和设计 B，允许刀片自由位移的滑动刀片配置。灵活的轮毂设计经过测试$1000°\mathrm{C}$. 转子完整性得以保留，但发生了局部叶片开裂。滑动刀片设计已成功通过测试$1100°\mathrm{C}$ 以尖端速度超过 1 小时 $350\mathrm{米}/\mathrm{秒}$没有问题。陶瓷/金属界面的拉伸载荷仍然是需要解决的关键挑战。减少摩擦应该可以克服叶片开裂，并使提议的 ICT 达到目标温度$1275°\mathrm{C}$ 和尖端速度 $425\mathrm{米}/\mathrm{秒}$.