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为实现稀释排气流量的精确测量,进行了锥形流量计的结构设计.建立锥形流量计流量的理论计算模型,编制了计算软件.应用Fluent计算流体动力学软件对锥形流量计进行流量仿真,并研究了锥体前后锥角大小、有无连接支撑杆以及气体温度等因素对流量计流量计量特性的影响.最后进行与标准临界文丘里喷嘴组的对比验证试验.结果表明,理论计算模型、仿真计算、试验验证的一致性较好,该流量计具有较高精度和稳定性,适合应用于汽车稀释排气流量测量.
In order to achieve accurate measurement of the diluted exhaust flow, the design of the conical flowmeter was carried out.The theoretical calculation model of the conical flowmeter was established, and the calculation software was compiled.The application of Fluent computational fluid dynamics software to the conical flowmeter Simulation and study of cone cone before and after the size of the cone, with or without connecting rod and gas temperature and other factors on the flowmeter measurement characteristics.Finally, with the standard critical Venturi nozzle group comparative verification test results show that the theoretical calculation The model, simulation calculation and test verification are in good agreement. The flowmeter has high precision and stability and is suitable for the measurement of diluted exhaust flow in automobiles.