安全阀稳态排量测试新技术研究

Study of a New Technology to Test the Discharge Rate of Safety Valve on Steady Discharge State

排量是衡量安全阀性能的重要参数,因此其准确计算和评估极为重要。排量的标准测试方法要求严格,测试繁琐且难以实施。与多数文献略去开启过程动态效应在固定开高状态下进行排量研究不同,文中研究了一种利用阀芯传感器的测试数据来评估动态开启稳定排放阶段排量的计量方法。数值模拟发现,超压泄放过程的稳态排放阶段喷管的喉部位于帘面,并且发现,排放流体处于跨音速流态。进一步的检测技术研究表明,稳态排量可以通过阀芯传感器采集的稳态排放数据来确定和计量,进而可以实现额定排量评估。这种新的排量计量和测试技术改变了传统的安全阀流量测试思路,扩展了阀芯传感器的应用范围,实现了一种简便易行的排量测试技术,且具有足够的测试精度。

Discharge capacity is the most important parameter to measure the safety valve performance ,so evaluating and measuring it accurately is extremely important .Standard test method of safety valve dis-charge capacity is too complicated and strict to promote .Different from lots of experimental studies on the discharge in most papers tested in a fixed opening height state which omitted the dynamic effects on tran -sient opening process will cause deviations .This paper has studied a new evaluating method of discharge in stable discharge stage by using the spool sensor tested data .Numerical simulations have found that the theoretical nozzle throat located on the curtain face and the relief fluid was in transonic flow stage when the valve was in stable discharge stage caused by overpressure .Further detection technology studies have shown that stable discharge could be determined and measured by the data of stable discharge stage col -lected by spool sensor , and could achieve the rated capacity assessment .This new detection method ex-plored the discharge testing technology ,revolutionized the traditional flow meter ideas ,extended the appli-cations of the spool sensor ,provided a simply approached testing method ,and the accuracy is sufficient .