半封闭螺杆制冷压缩机排气噪声模拟与试验研究

发布时间：2018-01-31 06:42

本文关键词： 螺杆压缩机气流脉动动网格数值模拟　出处：《机械工程学报》2017年20期 　论文类型：期刊论文

【摘要】：针对某R22半封闭螺杆制冷压缩机,通过动网格的划分建立充分考虑轴向排气孔口面积变化的排气流场模型,利用Fluent软件进行流场的动态数值模拟;将模拟得到的流场结果作为LMS的边界条件,模拟得到了双螺杆压缩机排气噪声频谱图;通过试验测量结果对模拟结果进行了验证;并进一步分析压缩机排气流道优化设计对气流脉动和噪声的影响。研究结果表明:模拟与试验的压力脉动最大值的误差在5%以内,噪声频谱的变化趋势基本一致;压缩机排气过程气流脉动主要集中在排气孔口处,并在排气腔内有明显衰减;光顺排气腔流道和增设周向排气导流槽,可有效减少排气过程的压力脉动;模拟和试验结果都表明:以模拟结果为依据的排气腔流道优化有效地降低了压缩机噪声,说明本文所述研究方法可指导半封闭双螺杆制冷压缩机的优化设计。
[Abstract]:For a R22 semi-enclosed screw refrigeration compressor, an exhaust flow field model with full consideration of the change of axial orifice area is established by dividing the moving mesh. The dynamic numerical simulation of the flow field is carried out by using Fluent software. The simulation results are taken as the boundary conditions of LMS, and the exhaust noise spectrum of twin-screw compressor is obtained by simulation. The simulation results are verified by the experimental results. The influence of the optimal design of the compressor exhaust passage on the flow pulsation and noise is further analyzed. The results show that the error of the maximum pressure fluctuation between the simulation and the test is less than 5%. The change trend of noise spectrum is basically the same; The flow pulsation of compressor is mainly concentrated at the vent of the compressor, and there is obvious attenuation in the exhaust chamber. The pressure pulsation in the exhaust process can be effectively reduced by fairing the flow channel of the exhaust chamber and adding the circumferential exhaust guideway. The simulation and test results show that the optimization of the exhaust chamber flow channel based on the simulation results can effectively reduce the compressor noise, which shows that the research method described in this paper can guide the optimization design of the semi-enclosed twin-screw refrigeration compressor.
【作者单位】：江苏科技大学能源与动力工程学院;西安交通大学苏州研究院;
【基金】：江苏省自然科学基金(BK20151246)和江苏省自然科学基金青年基金(BK20150380)资助项目
【分类号】：TB652
【正文快照】： 0前言随着螺杆压缩机技术的不断完善,压缩机运行噪声不断得到重视,并逐渐成为除价格和能效以外的另一大竞争热点[1]。根据螺杆压缩机运行原理,随着转子的旋转,基元容积周期性地与排气孔口相连通,并且排气孔口面积也随排气过程经历先增大后减小的变化过程,所产生的排气压力脉

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