双螺杆制冷压缩机气流脉动衰减器的研究与开发

发布时间：2018-03-03 07:37

本文选题：双螺杆制冷　切入点：压缩机　出处：《西安交通大学学报》2017年04期 　论文类型：期刊论文

【摘要】：为有效控制并降低双螺杆制冷压缩机排气气流脉动幅值,研究并开发了一种基于赫姆霍兹共振器的气流脉动衰减器。考虑到压缩机排气腔内的油气两相流动,首先基于两相流双流体方程,建立了油气两相环状流流型下的声速计算模型,实现了两相流动状态下衰减腔内共振频率的计算,开发了一种适用于螺杆制冷压缩机的气流脉动衰减器,就排气温度和润滑油含量对其衰减性能的影响进行了实验研究,并对比了有无衰减器时压缩机的机脚振动情况。研究结果表明:当润滑油含量保持不变时,存在最佳的R134a气体声速,使得衰减器性能最佳,但随着润滑油含量的增加,最佳的R134a气体声速有所上升;两相流声速决定了衰减腔的共振频率,存在最佳的两相流声速使得衰减器性能最佳,且随着润滑油含量的增加,最佳两相流声速基本不变,而最大衰减比有所提升;开发的脉动衰减器应用于螺杆制冷压缩机名义工况下运行时,一阶气流脉动频率下的机脚振动加速度可降低36.2%~40.9%。
[Abstract]:In order to effectively control and reduce the amplitude of exhaust flow pulsation of twin screw refrigeration compressor, a kind of air flow pulsation attenuator based on Hem Hortz resonator is studied and developed. Considering the two-phase flow of oil and gas in the exhaust chamber of compressor, Firstly, based on the two-phase flow equation, the acoustic velocity calculation model of the two-phase annular flow is established, and the resonance frequency of the attenuation cavity is calculated under the two-phase flow state. An air pulsation attenuator suitable for screw refrigeration compressor is developed. The effects of exhaust temperature and lubricating oil content on its attenuation performance are studied experimentally. The vibration of compressor feet with or without attenuators is compared. The results show that the optimum sound velocity of R134a gas exists when the lubricating oil content remains constant, which makes the performance of the attenuator best, but with the increase of lubricating oil content, The optimum sound velocity of R134a gas increases, the sound velocity of two-phase flow determines the resonance frequency of the attenuation cavity, and the optimum sound velocity of two-phase flow makes the performance of the attenuator best, and with the increase of lubricating oil content, the optimal two-phase flow sound velocity is basically unchanged. The maximum attenuation ratio is improved, and the developed pulsating attenuator is used in the operation of screw refrigeration compressor under nominal operating conditions, the vibration acceleration of the foot can be reduced by 36.2 and 40.9 at the first order flow pulsation frequency.
【作者单位】：西安交通大学能源与动力工程学院;西安交通大学苏州研究院;
【基金】：国家自然科学基金资助项目(51276134) 江苏省自然科学基金资助项目(BK20151246)
【分类号】：TB652

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