基于微压差测量技术的灭火剂浓度机载测试系统设计  

Design of Airborne Test System for Extinguishing Agent Concentration Based on Micro-differential Pressure Measurement Technology

作　　者：杨晓斌[1] 何晓文[1] YANG Xiaobin;HE Xiaowen(Chinese Flight Test Establishment,Xi'an 710089,China)

机构地区：[1]中国飞行试验研究院,西安710089

出　　处：《计算机测量与控制》2022年第5期75-80,91,共7页Computer Measurement &Control

摘　　要：为准确评测机载防火系统的灭火功能与性能,设计基于微压差测量技术的灭火剂浓度机载测试系统;通过真空泵采集灭火剂与空气复合气体,利用过滤器对其展开过滤后,传输至微压差浓度传感模块,经该模块的气体加热器加热该气体,温度控制器控制所加热气体温度,然后通过节流设备使其形成压差,利用压差传感器变更压差信号为电信号,再应用信号处理器展开信号处理,计算出灭火剂浓度并得出与其浓度值呈正相关的电信号;依据该信号,利用流量恒定设备高精度控制灭火剂与空气复合气体流量,合并该气体流量后将其输入稳压缓冲罐进行缓冲,通过气体分析仪测量灭火剂与空气复合气体差异浓度和压差的关联,输出灭火剂浓度数字信号,并利用排气口将测试完的灭火剂空气复合气体排入真空泵,通过真空泵将测试完的灭火剂空气复合气体排放至空气内;试验表明:该系统的测量范围大、单灭火剂浓度测量位置的测量最大误差值为0.39%,12个通道所有浓度测量位置的最大平均误差值为0.24%,满足实际应用要求。In order to accurately evaluate the fire extinguishing function and performance of the airborne fire protection system,an airborne test system for the concentration of fire extinguishing agent based on the micro-pressure difference measurement technology is designed.The composite gas of fire extinguishing agent and air is collected by a vacuum pump,filtered by a filter,and then transmitted to the micro-pressure difference concentration sensing module.The gas is heated by the gas heater of the module,and the temperature controller controls the temperature of the heated gas,and then The throttling device is used to form a pressure difference,the pressure difference sensor is used to change the pressure difference signal into the electrical signal,and then the signal processor is used to carry out signal processing to calculate the concentration of the extinguishing agent and obtain the electrical signal that is positively correlated with its concentration value;According to the signal,the constant flow equipment is used to control the flow of fire extinguishing agent and air composite gas with high precision,combined with the gas flow and inputs it into a pressure stabilized buffer tank for buffering,and measures the correlation between the differential concentration and pressure difference between fire extinguishing agent and air composite gas through a gas analyzer,outputs the digital signal of fire extinguishing agent concentration,and the exhaust port is used to discharge the tested fire extinguishing agent-air composite gas into the vacuum pump,and the tested fire extinguishing agent-air composite gas is discharged into the air through the vacuum pump.The test results show that the measurement range of the system is large,the maximum measurement error value of the single fire extinguishing agent concentration measurement position is 0.39%,and the maximum average error value of all concentration measurement positions of 12 channels is 0.24%,which meets the practical application requirements.

关 键 词：微压差测量 灭火剂浓度 机载测试系统 真空泵 压差传感器 气体分析仪 

分 类 号：V233.7[航空宇航科学与技术—航空宇航推进理论与工程]