新型燃烧器与热声斯特林发电机换热特性研究  

Heat Transfer Study of a Novel Combustor-coupled Thermoacoustic Stirling Generator

作　　者：靳晴月 孙浩杰 罗靖 余国瑶[1,3] 马英 黄云 马壮[1] 罗二仓 JIN Qingyue;SUN Haojie;LUO Jing;YU Guoyao;MA Ying;HUANG Yun;MA Zhuang;LUO Ercang(CAS Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Institute of Optical Physics and Engineering Technology,Qilu Zhongke,Jinan 250000,China;Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]中国科学院理化技术研究所低温工程学重点实验室,北京100190 [2]中国科学院大学,北京100049 [3]齐鲁中科光物理与工程技术研究院,济南250000 [4]中国科学院过程工程研究所,北京100190

出　　处：《工程热物理学报》2025年第4期1244-1254,共11页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51876214)。

摘　　要：本文提出了一种新型的适用于自由活塞斯特林发电机的气体燃烧器结构,并开展了以液化石油气为燃料的燃烧耦合传热过程的三维数值模拟研究。首先分析了额定工况下的燃烧器内部流场、温度场以及热流密度分布特性,其次考察了液化石油气进口流量、喷嘴结构和空气预热温度对流动换热特性的影响规律。结果表明:在液化石油气流率为4.6 L/min、空燃比为29的额定工况下,发电机高温换热器的吸热量为3.82 kW,占总反应热的54.65%,对流换热与辐射换热占比相当。随着燃料流量和空燃比的增加,发电机高温换热器的吸热量均呈先增加后减小的趋势。计算中还发现,在特定吸热条件下提高空气预热温度使高温换热器的吸热量显著降低,而喷嘴结构则对吸热量影响较小。This study introduces a novel gas combustor structure designed specifically for a free-piston Stirling generator(FPSG)and presents a numerical simulation of the heat transfer characteris-tics of external combustion coupled with internal oscillating flow within the novel combustor-coupled FPSG system,fueled by liquefied petroleum gas(LPG).The simulation initially focuses on analyzing the flow field,temperature distribution,and heat flux density characteristics within the combustor under its rated operating conditions.Furthermore,the study investigates the effects of fuel flow rate,nozzle structure,and air preheating temperature on the flow dynamics and heat transfer character-istics.The results indicate that,at the rated operating condition with a fuel flow rate of 4.6 L/min and an air-fuel ratio of 29,the high-temperature heat exchanger(HHX)absorbs 3.82 kW of heat,which corresponds to 54.65%of the reaction heat,with comparable contributions from convective and radiative heat transfer.Interestingly,increasing the fuel flow rate and air-fuel ratio initially leads to a rise in the heat accepted,followed by a subsequent reduction.Moreover,the calculations demonstrate that raising the air preheating temperature significantly reduces the heat accepted under specific heat absorption conditions,while the impact of the nozzle structure remains negligible.

关 键 词：自由活塞斯特林发电机 气体燃料燃烧器 辐射换热 数值模拟 

分 类 号：TK16[动力工程及工程热物理—热能工程]