流体机械

2010, v.38;No.457(07) 14-19

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考虑阀腔影响的气流脉动模拟改进
Improved Modeling of Gas Pulsation by Assuming the Valve Chamber as Pipe-tube-pipe Element

王中振;郭文涛;刘博想;冯健美;彭学院;
WANG Zhong-zhen1,GUO Wen-tao2,LIU Bo-xiang1,FENG Jian-mei1,PENG Xue-yuan1(1.Xi'an Jiaotong University,Xi'an,710049,China;2.Shenyang Blower Works Group Co.,Ltd.,Shenyang 110142,China)

摘要(Abstract):

传统的压缩机管路气流脉动分析没有考虑阀腔容积的影响,使得计算的压力脉动偏高,部分气柱固有频率信息与实际不符。本文通过将阀腔等效为"管—容—管"单元模型,对现有气流脉动模拟模型进行了改进。利用改进后的模型对1台空气压缩机排气管路内的气流脉动进行了模拟计算,并搭建试验台对计算结果进行了验证试验。研究结果表明:利用改进模型计算得到的气柱固有频率与实测值最大误差由改进前的13.5%降至1.08%;管路中压力脉动幅值与实测值之间的偏差由改进前的106.99%降至5.65%,而且改进后的波形与实测波形变化趋势吻合程度明显改善。
The current simulation of gas pulsation in the piping system of a reciprocating compressor does not allow for the influence of the valve chamber,resulting in higher calculated pulsation levels and some pseudo information of the gas column natural frequencies.By assuming the valve chamber as the pipe-volume-pipe element,this paper presents an improved model,which is applied to simulate the gas pulsation in the discharge piping system of a reciprocating air compressor.A test rig is built up to validate the improved model,in which the natural frequencies of the gas column are recorded and the pulsed pressures are measured.The results showed that the maximum deviation between the calculated gas column natural frequencies and the recorded data decreased from 13.5% for the conventional model to 1.08% for the improved one and the maximum error for the magnitudes of pressure pulsation decreased from 106.99% to 5.65%.The pressure wave predicted by the improved model is in good agreement with the measured result.

关键词(KeyWords): 气流脉动;往复式压缩机;阀腔;固有频率;压力脉动
gas pulsation;reciprocating compressor;valve chamber;natural frequency;pressure pulsation

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基金项目(Foundation): 国家高技术研究发展863计划(2006AA05Z134)

作者(Author): 王中振;郭文涛;刘博想;冯健美;彭学院;
WANG Zhong-zhen1,GUO Wen-tao2,LIU Bo-xiang1,FENG Jian-mei1,PENG Xue-yuan1(1.Xi'an Jiaotong University,Xi'an,710049,China;2.Shenyang Blower Works Group Co.,Ltd.,Shenyang 110142,China)

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