车用涡轮增压器启停冲击平台仿真及应用

Test bench for vehicle turbocharger durability under start-stop working conditions: simulation and applied research

为了考核车用涡轮增压器在频繁启停冲击工况下的可靠性,本文提出了一种新型自循环试验台架,并通过仿真实验验证了该台架的可行性。依据试验台的实际工作过程,建立了整个试验台的数学模型,并在Matlab/Simulink中搭建相应模块,对试验台架进行动态仿真;同时为了验证数学模型的关键假设是否成立,利用软件ANSYS/CFX对试验台架的局部管道进行流体仿真分析。仿真结果证明了该试验台架节约能源,且能够稳定地运行,可用来考核涡轮增压器在启停冲击工况下的可靠性,同时为试验台的应用提供了必要的技术参数(喷油压力、阀门控制策略和燃气温度等)。

A new experimental test bench that is based on the self-circulation method is proposed for testing turbocharger durability under frequent start-stop conditions. The feasibility of the test bench is verified through simulation. First, a mathematical model for the test bench is established in accordance with its actual working process. Then, the corresponding modules for its dynamic simulation are established in Matlab/Simulink. Meanwhile, to verify the feasibility of the key hypothesis for the mathematical model, the local pipeline flow is simulated on CFX. Results showed that the proposed test bench can operate steadily with low energy consumption during the testing of turbocharger durability under start-stop conditions. Additional data, such as fuel injection pressure, intake gas rate, and combustion gas temperature, are provided for practical applications.