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《热科学学报》2020年第4期目录,Vol29,No.4
Keywords:《Journal of Thermal Science》Contents-July-August 2020
Volume 29, Issue 4, 2020 | PDF
Article
Published: July 5, 2020
Views:81
Review on Large Eddy Simulation of Turbulent Premixed Combustion in Tubes;管道内湍流预混燃烧的大涡模拟研究现状
Authors: LUO Gang,DAI Haidong,DAI Lingpeng
Institution:Zhejiang College of Security Technology
Keywords:LES, turbulent premixed combustion, SGS models, empty tube, obstructed tube
doi:https://doi.org/10.1007/s11630-020-1311-5
Volume 29, Issue 4: 853-867, 2020 | PDF
Review
Published: July 5, 2020
Views:46
Abstract: 中文导读:本文综述了空管道和置障管道内湍流预混燃烧的大涡模拟研究现状。从模型开发的角度,本文综合分析了重要的亚格子涡粘模型和亚格子燃烧模型的发展历程及其适用性。大涡模拟方法也被用来将流动及燃烧模型有机结合去再现现实生活中管道爆燃、爆轰以及爆燃转爆轰(DDT)现象。文章中所呈现的模型及其应用可以引导读者理解大涡模拟在管道爆炸方面的研究进展及其不足之处。
Characteristics of Nitric-Oxide Emissions from Traditional Flame and MILD Combustion Operating in a Laboratory-Scale Furnace;实验规模燃烧炉中传统燃烧和MILD燃烧的氮氧化物排放特性
Authors: SHU Ziyun,WANG Feifei,DAI Chong
Institution:College of Engineering, Peking University
Keywords:MILD (moderate or intensive low-oxygen dilution) combustion, traditional combustion, NO emission
doi:https://doi.org/10.1007/s11630-020-1235-0
Volume 29, Issue 4: 868-883, 2020 | PDF
Article
Published: July 5, 2020
Views:43
Abstract: 中文导读—本文在40 kW规模的实验炉中研究了MILD(温和与极度低氧稀释)燃烧(MILDC)与具有可见火焰的传统燃烧(TC)中的氮氧化物(NO)的形成和排放特性。在同一炉膛中持续开展了两种燃烧条件下的天然气燃烧实验,功率固定为19kW,当量比为0.86。为了解释两种燃烧中所测得的炉温和烟气中NO排放的差异,对TC和MILDC进行了数值模拟。文中展示了NO排放(XNO)在不同炉壁温度(Tw)...
Experimental Study of Influence of Fuel Ratio on Combustion Characteristics of Diesel-Wetted Wood Powder;油粉比对柴油浸润木粉燃烧特性影响的实验研究
Authors: CHEN Changkun,LEI Peng,ZHANG Yulun
Institution:State Grid Hunan Electric Company Limited Disaster Prevention and Reduction Center
Keywords:diesel-wetted wood powder, fuel ratio, flammability, combustion characteristics
doi:https://doi.org/10.1007/s11630-020-1259-5
Volume 29, Issue 4: 884-892, 2020 | PDF
Article
Published: July 5, 2020
Views:36
Abstract: 中文导读—使用0号柴油和杨木粉,研究了油粉比(即柴油质量与木粉质量之比)对柴油浸润木粉燃烧特性的影响。油粉比设置为0、0.5、1.0、1.5和2.0,实验中测量和分析了火焰行为、温度分布、质量损失率和一氧化碳浓度。结果表明,由于蒸发和毛细力的耦合作用,与纯木粉(燃点在280℃以上)和纯柴油(闪点在107℃以上)相比,柴油浸润了的木粉的燃点显著下降(小于4℃)。在燃烧初期,柴油在毛细力的作用下...
Numerical Research on Inlet Total Pressure Distortion in a Transonic Compressor with Non-Axisymmetric Stator Clearance;带有非轴对称静叶间隙的跨音速压气机在进口总压畸变条件下的数值研究
Authors: XU Wenfeng,SUN Peng,YANG Guogang
Institution:Dalian Maritime University
Keywords:total pressure distortion, non-axisymmetric stator clearance, transonic compressor, numerical simulation
doi:https://doi.org/10.1007/s11630-020-1289-z
Volume 29, Issue 4: 893-905, 2020 | PDF
Article
Published: July 5, 2020
Views:33
Abstract: 中文导读—压气机进口总压畸变严重影响压机乃至整个发动机的性能和稳定性。受畸变影响气流通过压气机,在下游流场产生非轴对称性,以往的研究主要基于气流周向均匀进行设计,而本研究旨在利用非轴对称结构改善由畸变造成的周向非均匀流动。本文采用非轴对称静叶间隙结构来改善进口总压畸变引起的非均匀流动,在畸变区域内安装了9片带有叶顶间隙的静叶,研究不同工况下改型前后压气机内部流场和性能。研究结果表明,采用9片...
Flow Regulation and Heat Transfer Characteristics in a Novel Turbine Shroud with Internal Asymmetric Throttle Chamber;带非对称节流腔的涡轮外环气膜孔排流量调节以及内部换热特性研究
Authors: ZHANG Wei,ZHU Huiren,LI Guangchao
Institution:Northwestern Polytechnical University
Keywords:turbine shroud, throttle chamber, mass flow rate regulation, heat transfer
doi:https://doi.org/10.1007/s11630-020-1229-y
Volume 29, Issue 4: 906-915, 2020 | PDF
Article
Published: July 5, 2020
Views:44
Abstract: 中文导读—用数值计算的方法研究了带节流腔的涡轮外环内部流动和换热特性。涡轮外环的原始模型包括冲击孔、气膜孔以冲击通道。 在原始模型内部冲击通道处增设节流腔,在节流腔上板面处布置两种不同位置和孔数的节流孔来调节不同气膜孔排流量。在不同孔排的气膜孔出口处设置不同的压力来模拟主流的顺压力梯度。冲击孔入口处的总压和气膜孔出口处静压的比值从1.6到4.6. 为了验证湍流模型的合理性,靶面怒塞尔数的计算...
Numerical Investigation of Circumferential Groove Casing Treatment in a Highly-Loaded Low-Reaction Transonic Compressor Rotor;高负荷低反力度跨声速压气机转子周向槽机匣处理的数值研究
Authors: ZHU Wei,CAI Le,WANG Songtao
Institution:Harbin Institute of Technology
Keywords:low-reaction transonic compressor, circumferential casing groove, vortex breakdown, stall margin
doi:https://doi.org/10.1007/s11630-019-1180-y
Volume 29, Issue 4: 916-927, 2020 | PDF
Article
Published: July 5, 2020
Views:33
Abstract: 中文导读—本文采用数值方法研究了周向槽机匣处理对高负荷低反力跨声速压气机转子性能的影响。首先,对近失速点进行了稳态计算,分析流场结构发现,在叶尖区域存在泄漏涡破碎,涡破碎产生的流道阻塞最终导致压气机失速。然后,研究了如何在不损失效率的情况下将周向槽应用于压气机扩稳。通过改变周向槽轴向位置和数量得到三种方案。计算结果表明,槽的最佳位置在叶片前缘附近,下游槽对压气机的性能的影响是累积的。最优方案...
Inducer/Exducer Matching Characteristics inside Tandem Impellers of a Highly Loaded Centrifugal Compressor;高负荷离心压气机串列叶轮前后排叶片匹配特性研究
Authors: LI Ziliang,ZHAO Shengfeng,LU Xin’gen
Institution:Institute of Engineering Thermophysics, Chinese Academy of Sciences
Keywords:highly loaded centrifugal compressor, tandem impeller, inducer/exducer matching, flow mechanism, Kutta condition
doi:https://doi.org/10.1007/s11630-020-1191-8
Volume 29, Issue 4: 928-944, 2020 | PDF
Article
Published: July 5, 2020
Views:27
Abstract: 中文导读—由于离心叶轮内部的复杂流动和叶轮与扩压器直接的匹配恶化,离心压气机的效率和裕度通常较低。一直以来,串列叶轮技术被认为有望改善离心叶轮的内部流动并改善叶轮与扩压器之间的匹配,然而相关的研究结论通常结果各异、难以统一,根源就在于对串列叶轮内部流动机理的研究还不够深入。由于串列叶轮前后排叶片强烈的相互作用,串列叶轮通常表现出其独特的流动特性。本文采用经过校核的数值模拟方法,深入研究了串列...
Numerical Investigation of a Centrifugal Compressor with a Pre-Compression Wedge Diffuser under High Subsonic Conditions;带预压缩型扩压器在高跨音速离心压气机中的应用研究
Authors: WANG Yi,LI Qingkuo,BAI Huan
Institution:Central South University
Keywords:wedge diffuser, pre-compression, high Subsonic, centrifugal compressor
doi:https://doi.org/10.1007/s11630-020-1332-0
Volume 29, Issue 4: 945-954, 2020 | PDF
Article
Published: July 5, 2020
Views:33
Abstract: 中文导读—随着离心压气机压比的增高,扩压器入口的高跨音甚至超音速流动会导致额外的激波损失,大大降低了压气机级性能。研究表明,在半无叶区带预压缩结构的扩压器可以有效减少激波损失并提升压气机性能。本文在某高跨音离心压气机的基础上,设计并分析了带预压缩结构的扩压器,研究了不同预压缩角度,流道扩张角以及叶片数对压气机性能的影响。结果表明,当预压缩角度在2.5-5.5°,流道扩张角为7-9°时,扩压器...
Investigation of the Conjugate Heat Transfer and Flow Field for a Flat Plate with Combined Film and Impingement Cooling;平板气膜冲击冷却的流场及耦合换热研究
Authors: FU Jinglun,CAO Ying,ZHANG Chao
Institution:Institute of Engineering Thermophysics, Chinese Academy of Sciences
Keywords:conjugate heat transfer, combined film and impingement cooling, overall cooling effectiveness, Biot number, blowing ratio
doi:https://doi.org/10.1007/s11630-020-1233-2
Volume 29, Issue 4: 955-971, 2020 | PDF
Article
Published: July 5, 2020
Views:23
Abstract: 中文导读—气膜与冲击复合冷却是保护燃气轮机叶片免受高温燃气侵蚀的有效技术之一。本文对采用了气膜冷却和冲击冷却结合的平板复合结构进行了气热耦合数值计算。首先通过平板耦合实验,验证数值计算方法的可靠性。然后通过数值模拟分别研究了Biot数、吹风比、气膜孔形状、冲击孔直径等因素对综合冷却效率的影响。结果表明,对于特定的复合冷却方案和给定的吹风比,冷气潜能可以合理分配到内外部冷却中,从而达到整体冷却...