摘要
为了分析输油泵的泵内部流体噪声及泵外部噪声的发生规律,对泵内流体声学的模拟方法以及泵噪声测试的试验方法进行研究.基于CFD/CA工具对声学数值模拟进行流场与声场间的耦合计算,对流动诱导噪声的声场传播规律进行求解,分析了回流或空化现象发生时的流动噪声声压级变化和频域特征.研究发现泵内未发生空化前,流动诱导噪声的频谱呈离散型,集中在低频区,并在高频时快速衰减,随着空化系数逐渐变小,叶轮与导叶之间的动静干涉作用成为泵内诱导噪声的主因.而试验测试是基于四端网络法,针对不同工况下的流动诱导噪声进行试验研究,发现泵噪声主要和泵流量有关,而泵机组噪声主要和泵运行工况有关.
To study the generating mechanism of the internal fluid noise and external noise of the pump,the experimental and simulation methods are put forward respectively. Based on the CFD/CA tool,the coupling between the flow field and the sound field is calculated. The propagation law of the sound field by the flow induced noise is solved. The changes of the sound pressure level and the frequency domain of the flow noise at the time of reflow or cavitation are analyzed. Before the cavitation,the flow-induced noise spectrum is discrete. Concentrated on the low frequency region,at high frequency fast decay,with the cavitation coefficient gradually decreases,the interaction between impeller and guide vanes become the main cause of noise induced by pumps. The noise experimental test is based on the four-terminal network method,the pump noise is mainly related to the pump flow,and the noise of the pump unit is mainly related to the pump running condition.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2017年第8期645-651,共7页
Journal of Drainage and Irrigation Machinery Engineering
基金
江苏省重点研发计划项目(BE2015129
BE2016160)
江苏省产学研前瞻性联合研究项目(BY2016072-02)
江苏省自然科学基金资助项目(BK20130516)
江苏省普通高校研究生科研创新计划项目(KYLX16_0894)
关键词
管道输油泵
离心泵
诱导噪声
噪声试验
空化
pipeline oil pump
centrifugal pump
induced noise
noise experiment
cavitation
