NH_(3)/DME混合物着火特性试验与数值模拟研究  

Experimental and numerical study on ignition characteristics of NH_(3)/DME blends

作　　者：程前[1] 张尊华[1] 周梦妮[1] 李格升[1] CHENG Qian;ZHANG Zun-hua;ZHOU Meng-ni;LI Ge-sheng(School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan,China,Post Code:430063)

机构地区：[1]武汉理工大学船海与能源动力工程学院,湖北武汉430063

出　　处：《热能动力工程》2023年第10期72-78,共7页Journal of Engineering for Thermal Energy and Power

基　　金：湖北省自然科学基金(2022CF845)。

摘　　要：为了探究NH_(3)/DME混合物的着火特性,利用激波管测量了初始温度T=1250~1800 K、当量比Φ=0.5~2.0、DME掺混比X_(DME)=0~1.0、压力p=1 MPa条件下NH_(3)/DME混合物的着火延迟时间。基于测量的试验数据,更新了Issayev等人构建的NH_(3)/DME燃烧反应动力学模型的部分基元反应,更新后的模型表现出对NH_(3)/DME着火延迟时间的良好预测。在此基础上,进一步开展了NH_(3)/DME着火特性值模拟研究。结果表明:NH_(3)/DME高温着火延迟时间随二甲醚(DME)掺混比的增加呈指数降低;NH_(3)/DME的着火延迟时间随当量比的增加先降低后升高,且不同温度下达到最低着火延迟时间的当量比不同;中低温下NH_(3)/DME的着火延迟时间随初始温度的变化规律与高温下不同,呈现出明显的负温度系数(NTC)现象。To investigate the ignition characteristics of ammonia/dimethyl ether(DME)mixtures,the ignition delay time of NH_(3)/DME blends was measured by using shock tube at T=1250-1800 K,Φ=0.5-2.0,X_(DME)=(0-1.0)andp=1 MPa.Based on the measured experimental data,several elementary reactions of NH_(3)/DME combustion reaction kinetics model contructed by Issayev were updated.The updated model showed a good prediction of the ignition delay time of NH_(3)/DME.On this basis,furtherly,the ignition characteristic of NH_(3)/DME blends was numerically studied.The results show that the hightemperature ignition delay time of NH_(3)/DME decreases exponentially with the increase of DME blending ratio;the high-temperature ignition delay time of NH_(3)/DME decreases first and then increases with the increase of equivalence ratio,and the equivalence ratio corresponding to the minimum ignition delay time varies at different temperatures;the variation rule of ignition delay time of NH_(3)/DME at medium and low temperatures with the initial temperature is different from that at high temperature,showing an obvious negative temperature coefficient(NTC)phenomenon.

关 键 词：氨 二甲醚 激波管 着火延迟时间 燃烧反应动力学 

分 类 号：TK16[动力工程及工程热物理—热能工程]