增压器涡轮箱热-结构强度分析及试验验证

摘要

为了能够直接验证热-结构耦合仿真计算的精确性,以某型增压器涡轮箱为研究对象,运用CFD分析软件与FEA分析软件同步耦合仿真计算涡轮端温度场,然后将求解得到的温度场节点温度赋给结构分析模型,再求解涡轮箱模型的热应力.在发动机台架上运行增压器,发动机运行时采用与增压器CFD仿真计算相同的边界参数,采用红外热像仪测定考察区域的温度场分布,通过非接触式应变测量系统测定考察区域的应变分布,提取考察区域标记考察点的温度及应变结果,并与仿真计算的温度及应变结果进行对比分析,结果表明,采用热-结构耦合分析方法求解的涡轮箱温度和应变精度能满足工程设计要求.%In order to verify the accuracy of thermal structural coupling simulation analysis,a certain type of turbine housing of turbocharger was taken as the research object.The synchronous coupling simulation and calculation of turbine end temperature field was conducted by using CFD and FEA software,the gained joint temperature of temperature field was input to structural analysis model and the thermal stress of turbine housing model was solved.With the same boundary parameters as simulation,the turbocharger ran on the engine test bench and the temperature field and strain distributions of inspection area were measured by using the thermal infrared imager and non-contact strain measurement system respectively.The temperature and stain results were acquired and compared with simulation results.The results show that the temperature and strain accuracy of turbine housing can meet engineering design requirements.