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混合制冷工质波转子结构性能优化

Structural performance optimization of mixed refrigerant wave rotor
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摘要 将波转子嵌入自复叠制冷循环中,利用运动激波和膨胀波可以在设备通道内实现体积功的直接交换,缩短了高低压流股的能量传递路径,对提升制冷系统的能效有益.采用数值计算,完成了膨胀比为1.8、增压比为1.25条件下R134a/R23混合制冷工质的波转子波图.考虑到波转子设备出入口流体速度在周向的分量会对设备性能产生影响,完成了出入口的倾斜角度优化.研究发现,在转动方向上中压出口倾斜6°、高压入口倾斜3°、低压入口倾斜2°的结构,可使波转子的理论引射率自33.20%提升至37.29%,达到了小膨胀比下波转子的最优引射性能.根据波图,高低压流股的交界面轴向耗散较小,在原有尺寸基础上,轴向尺寸缩短50%时未发现引射率急剧下降现象,该结论对缩短波转子轴向尺寸具有重要意义. Embedding the wave rotor into the auto-cascade refrigeration cycle, using motion excitation wave and expansion wave can realize the direct exchange of volume work within the equipment channel, which shortens the energy transfer path of high and low pressure flow units and is beneficial to improving the energy efficiency of the refrigeration system. The wave diagram of R134a/R23 mixed refrigerant wave rotor with 1.8 of expansion ratio and 1.25 of pressure ratio is completed by means of numerical calculation. Considering performance effects of the circumferential component of the inlet and outlet fluid velocities of the wave rotor equipment, the optimization of the tilted angle of the inlet and outlet is completed. It is found that the structure with medium pressure outlet tilted at 6°, high pressure inlet tilted at 3° and low pressure inlet tilted at 2° in the rotation direction can increase the theoretical entrainment ratio of the wave rotor from 33.20% to 37.29%, which achieves the optimal induced performance of the wave rotor with small expansion ratio. According to the wave diagram, axial dissipation of the contact surface of high and low pressure flow units is small and no sharp decrease in the entrainment ratio is found when the axial dimension is shortened by 50% on the basis of the original dimension. The conclusion is of great significance to shortening the axial dimension of the wave rotor.
作者 张璐伟 代玉强 张德聪 俞宁 ZHANG Luwei;DAI Yuqiang;ZHANG Decong;YU Ning(School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China)
出处 《大连理工大学学报》 CAS CSCD 北大核心 2024年第4期361-367,共7页 Journal of Dalian University of Technology
基金 国家重点研发计划项目(2018YFA0704602)。
关键词 气波制冷增压 真实气体 结构优化 自复叠制冷 gas wave refrigeration supercharging real gas structural optimization auto-cascade refrigeration
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