【摘要】：復雜路況造成汽車尾氣參數(shù)呈現(xiàn)較強的動態(tài)特征,故有機朗肯循環(huán)(ORC,Organic Rankine Cycle)系統(tǒng)在尾氣余熱回收實際運行中往往偏離穩(wěn)態(tài)設計工況點,造成實際效率偏低。針對此問題,建立了ORC系統(tǒng)動態(tài)模型,將熱源動態(tài)特征分解為6種模式,分析了熱源溫度和流量階躍對系統(tǒng)穩(wěn)定性的影響。基于模擬結(jié)果的分析顯示階躍時間與系統(tǒng)穩(wěn)定時間呈線性正相關(guān);階躍起始流量與系統(tǒng)穩(wěn)定時間呈線性負相關(guān);階躍起始溫度、階躍溫度變化值和流量變化值三者與穩(wěn)定時間呈二次函數(shù)關(guān)系。相關(guān)研究結(jié)論對車載ORC系統(tǒng)控制設計有較好的指導意義。
[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.
【作者單位】： 天津大學中低溫熱能高效利用教育部重點實驗室;
【基金】：國家科技部863項目(2012AA051103) 天津市科技支撐重大項目(11ZCZDGZ19800)
【分類號】：U464.13;X734.2

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