Mechanism analysis and suppression of the outlet pressure rise of the large flux pressure reducing valve
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摘要: 大流量气调式气体减压器是飞行器地面试验系统的关键设备，针对减压器在大流量长程试验过程中出现的出口压力上漂问题进行了建模分析、控制系统设计与试验验证。对减压器活动组件进行力学分析，建立活动组件稳态工作模型，分析得到由于气源压力下降导致了减压器出口压力上漂，并可以通过调节控制腔压力的方式加以抑制。基于可编程逻辑控制器（PLC)设计了一套压力反馈式控制系统，通过传感器采集出口压力信号，并利用带有高速电磁阀的增压罐对控制腔气体压力进行调节，实现了对出口压力的自动稳定控制。在16~27kg/s的气体质量流量下，长程试验结果表明，该控制系统工作稳定可靠，成功地抑制了减压器出口压力的上漂。Abstract: The large flux pressure reducing valve (PRV) is a key part of the aircraft ground testing system. The problem of outlet pressure rise of the PRV is tackled in this paper by modeling analysis, control system design and experimental verification. First, the force analysis of the PRV kinetic components is conducted, which is utilized to establish the steady working model. It is observed from the expression that the sustaining decrease of the inlet pressure can cause the rise of the outlet pressure and the influence factors of the PRV outlet pressure is obtained. This problem can be solved by adjusting the control chamber pressure. Second, the control system framework is constructed based on Programmable Logic Controller (PLC). The outlet pressure feedback control is conducted by acquiring the outlet pressure signal via sensors and adjusting control chamber pressure using the booster jar with high-speed solenoid valves. At last, a series of long-term experiments of 30~60 seconds are designed to test the feasibility of the control system at a large mass flow rate of 16~27kg/s. Results show that this control system effectively stabilizes the outlet pressure and successfully solves the outlet pressure rise problem in the testing process.
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图 3 入口管路、入口腔、卸荷腔压力曲线[19]
Fig. 3 The pressure variation of the inlet pipe, inlet chamber and unloading chamber
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