超临界二氧化碳布雷顿循环被认为是下一代核电和能源系统最有潜力的候选者,而离心压缩机是这个循环中最重要的部件之一。压缩机进口工况在临界点附近且位于类液态区域,这会在叶片前缘产生冷凝和类蒸发的可能。采用数值模拟的计算方法,研究了叶片前缘型线对某10MW超临界二氧化碳离心压缩机类相变的影响,进口总温为305.15K,进口总压为7.8MPa。将主叶片前缘设置成不同椭圆轴比的椭圆形前缘,椭圆轴比分别为1：1,2：1,3：1和4：1。数值计算结果表明：增大前缘的椭圆轴比可以削弱吸力峰,使低温低压区域减小,但对叶片吸力面的类蒸发现象却不能起到抑制的作用。从性能方面来看,压缩机的效率和压比都随椭圆轴比的增大而增大,在最高效率点,椭圆轴比最大的压缩机效率提升0.44%,压比提升0.011。

The supercritical carbon dioxide Brayton cycle is considered the most promising candidate for next-generation nuclear power and energy systems, with the centrifugal compressor being one of its most crucial components. Operating conditions of the compressor are near critical points and within the liquid-like region, which can lead to the possibility of condensation and pseudo-evaporation at the blade leading edge. Using numerical simulation methods, the study investigated the effect of leading edge profiles on quasi-phase change in a 10MW supercritical carbon dioxide centrifugal compressor. Total inlet temperature is 305.15K, total inlet pressure is 7.8MPa. Leading edges of the main blades were set to different ellipticity ratios: 1:1, 2:1, 3:1, and 4:1.Numerical results indicate that increasing the ellipticity ratio of the leading edge can reduce the suction peak and decrease the size of the low-temperature, low-pressure region. However, it does not suppress the pseudo-evaporation phenomenon on the suction side of the blades. From a performance perspective, both the efficiency and pressure ratio of the compressor increase with higher ellipticity ratios. At the peak efficiency point, the compressor with the highest ellipticity ratio shows an efficiency improvement of 0.44% and a pressure ratio increase of 0.011.

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