动态热源的车载有机朗肯循环系统特性分析
发布时间：2019-07-26 05:32
【摘要】：复杂路况造成汽车尾气参数呈现较强的动态特征,故有机朗肯循环(ORC,Organic Rankine Cycle)系统在尾气余热回收实际运行中往往偏离稳态设计工况点,造成实际效率偏低。针对此问题,建立了ORC系统动态模型,将热源动态特征分解为6种模式,分析了热源温度和流量阶跃对系统稳定性的影响。基于模拟结果的分析显示阶跃时间与系统稳定时间呈线性正相关;阶跃起始流量与系统稳定时间呈线性负相关;阶跃起始温度、阶跃温度变化值和流量变化值三者与稳定时间呈二次函数关系。相关研究结论对车载ORC系统控制设计有较好的指导意义。
[Abstract]:Because of the strong dynamic characteristics of automobile exhaust gas parameters caused by complex road conditions, the organic Rankine cycle (ORC,Organic Rankine Cycle) system often deviates from the steady design working condition point in the actual operation of exhaust heat recovery, resulting in the actual efficiency is on the low side. In order to solve this problem, the dynamic model of ORC system is established, and the dynamic characteristics of heat source are decomposed into six modes. The influence of heat source temperature and flow rate step on the stability of the system is analyzed. The analysis based on the simulation results shows that the step time is positively correlated with the system stability time, the step initial flow rate is negatively correlated with the system stability time, and the step initial temperature, step temperature change value and flow rate change value are quadratic function relations with the stability time. The related research conclusions have a good guiding significance for the control design of vehicle ORC system.
【作者单位】： 天津大学中低温热能高效利用教育部重点实验室;
【基金】：国家科技部863项目(2012AA051103) 天津市科技支撑重大项目(11ZCZDGZ19800)
【分类号】：U464.13;X734.2
[Abstract]:Because of the strong dynamic characteristics of automobile exhaust gas parameters caused by complex road conditions, the organic Rankine cycle (ORC,Organic Rankine Cycle) system often deviates from the steady design working condition point in the actual operation of exhaust heat recovery, resulting in the actual efficiency is on the low side. In order to solve this problem, the dynamic model of ORC system is established, and the dynamic characteristics of heat source are decomposed into six modes. The influence of heat source temperature and flow rate step on the stability of the system is analyzed. The analysis based on the simulation results shows that the step time is positively correlated with the system stability time, the step initial flow rate is negatively correlated with the system stability time, and the step initial temperature, step temperature change value and flow rate change value are quadratic function relations with the stability time. The related research conclusions have a good guiding significance for the control design of vehicle ORC system.
【作者单位】： 天津大学中低温热能高效利用教育部重点实验室;
【基金】：国家科技部863项目(2012AA051103) 天津市科技支撑重大项目(11ZCZDGZ19800)
【分类号】：U464.13;X734.2
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