超临界CO_(2)两级离心式压缩机实验研究

Experimental Study on Supercritical CO_(2) Two-stage Centrifugal Compressor

以超临界CO_(2)单级离心式压缩机设计及实验经验为基础,设计开发超临界CO_(2)两级离心式压缩机,解决原有单级离心式压缩机存在的气动设计、轴向力平衡以及密封问题,并完成该两级离心式压缩机多进口工况全载实验,实现超临界CO_(2)两级离心式压缩机安全稳定运行,累计运行时间接近100h,运行转速达到100%设计转速,并获取90%、80%、70%等转速下的压缩机性能曲线,实验最大总压比超过2.69,最大质量流量接近16kg/s。从实验对象、实验平台以及实验结果等角度对实验进行详细介绍,为超临界CO_(2)离心式压缩机设计理论及数值模拟研究提供更具价值的实验数据。最后,将实验压缩机与多个型号单级离心式压缩机实验结果进行对比,提出降低转速是提高超临界CO_(2)离心式压缩机性能的技术路径之一。

Based on the design and experimental experience of supercritical CO_(2) single-stage centrifugal compressor,this paper designed and developed a supercritical CO_(2) two-stage centrifugal compressor,to solve the problems of aerodynamic design,axial force balance and sealing problem which exists in the single-stage centrifugal compressor,and thus complete the full-load experiment under multi-inlet conditions of the two-stage centrifugal compressor.The safe and stable operation of the supercritical CO_(2) two-stage centrifugal compressor can be realized.The accumulated operating time was close to 100h and the rotor reached full speed.The compressor performance curves at 90%,80%and 70%of the design speed were obtained.The maximum total pressure ratio in the experiment exceeded 2.69 and the maximum mass flow was close to 16 kg/s.In this paper,the experiments are described in detail from the objects,platforms and results,which can provide more valuable experimental data for the design theory and numerical simulation of supercritical CO_(2) centrifugal compressor.Finally,the results of the experiment were compared with those of several single-stage centrifugal compressors.It can be proved that reducing rotational speed is one of the effective paths to improve the performance of the supercritical CO_(2) centrifugal compressor.