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燃烧型超高频热声斯特林发电机实验研究

工程热物理学报 2024年第3期45卷 661-666页

作者：肖望余国瑶马英马壮成阳斌罗二仓武汉工程大学光电信息与能源工程学院武汉430205 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 齐鲁中科光物理与工程技术研究院济南251000 中国科学院大学北京100049

几十至几百瓦级便携式发电设备在离网应用和应急救灾等场景发挥着重要作用。自由活塞斯特林热机因其外燃属性带来的燃料适应性好、高效、可靠和静音等突出优点而有望成为便携式电源系统的重要发电技术。本文首次提出柴油气化燃烧驱动超... 详细信息

几十至几百瓦级便携式发电设备在离网应用和应急救灾等场景发挥着重要作用。自由活塞斯特林热机因其外燃属性带来的燃料适应性好、高效、可靠和静音等突出优点而有望成为便携式电源系统的重要发电技术。本文首次提出柴油气化燃烧驱动超高频自由活塞斯特林发电机的便携式发电系统。基于热声学的阻抗匹配和燃烧–交变流动热耦合,设计并研制了一套实验系统,实验中系统考察了不同燃烧功率下的输出特性,并开展了损失分析。初步实验结果表明,该发电系统在加热温度约为600℃时的最大输出电功为320 W,以柴油热值计算的最高热电效率为11.28%。受益于130 Hz的超高工作频率,发电机本体的比功率为90 W/kg,展现出良好的应用潜力。

关键词：柴油蒸发燃烧超高频自由活塞斯特林发电机输出特性

双作用斯特林热机内部气体微团运行机理数值研究

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太阳能学报 2024年第6期45卷 389-395页

作者：常德鹏孙岩雷王珏罗靖胡剑英罗二仓中国科学院理化技术研究所低温科学与技术重点实验室北京100190 中国科学院大学工程科学学院北京100049 航天科工空间工程发展有限公司北京100854

针对一台双作用斯特林热机,通过SAGE计算以及Runge-Kutta法和线性插值等后处理过程,对内部气体微团进行热力求解,最终得到由欧拉观点转化为拉格朗日观点的热力结果。研究表明,斯特林热机回热器内部各气体微团独自运行于不同的热力过程,... 详细信息

针对一台双作用斯特林热机,通过SAGE计算以及Runge-Kutta法和线性插值等后处理过程,对内部气体微团进行热力求解,最终得到由欧拉观点转化为拉格朗日观点的热力结果。研究表明,斯特林热机回热器内部各气体微团独自运行于不同的热力过程,气体微团间互相接力,实现宏观上发动机的热功转换功能,其热力循环的包络线近似于2个等压过程和2个等温过程的组合。同时,研究实际机型的气体微团运行机理和热力过程,并从数值上验证斯特林循环与概括性卡诺循环的相互关系,为斯特林热机的设计与分析提供一定的理论基础。

关键词：斯特林热机斯特林循环 Runge-Kutta法运行机理概括性卡诺循环

Acoustic characteristics of bi-directional turbines for thermoacoustic generators

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Frontiers in Energy 2022年第6期16卷 1027-1036页

作者： Dongdong LIU Yanyan CHEN Wei DAI ercang luo University of Chinese Academy of Sciences Beijing 101408China Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China

Bi-directional turbines combined with rotary motors may be a feasible option for developing high power thermoacoustic generators with low cost.A general expression for the acoustic characteristics of the bidirectional turbine was proposed based on theoretical derivation,which was validated by computational fluid dynamics modeling of an impulse turbine with fixed guide *** structure of the turbine was optimized primarily using steady flow with an efficiency of near 70%(the shaft power divided by the total energy consumed by the turbine).The turbine in the oscillating flow was treated in a lumped-parameter model to extract the acoustic impedance characteristics from the simulation *** key acoustic impedance characteristic of the turbine was the resistance and inertance due to complex flow condition in the turbine,whereas the capacitance was treated as an adiabatic case because of the large-scale flow channel relative to the heat penetration *** for the impedance were obtained from both theoretical predictions and numerical *** good fit of the correlations shows that these characteristics are valid for describing the bi-directional turbine,providing the basis for optimization of the coupling between the thermoacoustic engine and the turbine using quasi-one-dimensional theory in the frequency domain.

关键词： thermoacoustic power generator acoustic characteristics bi-directional impulse turbine energy conversion

Investigation of High-Stability Temperature Control in Primary Gas Thermometry

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Journal of Thermal Science 2022年第3期31卷 765-776页

作者： HU Jiangfeng ZHANG Haiyang SONG Yaonan PAN Changzhao GAO Bo LIU Wenjing HAN Dongxu ZHANG Zhen luo ercang PITRE Laurent TIPC-LNE Joint Laboratory on Cryogenic Metrology Science and Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China Key Laboratory of Cryogenics Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100490China Laboratoire national de métrologie et d’essais-Conservatoire national des arts et métiers F93210La Plaine-Saint DenisParisFrance School of Mechanical Engineering Beijing Institute of Petrochemical TechnologyBeijing102617China

We presented a relationship between the temperature control and measurement stability limit and the temperature resolution,particularly for using rhodium-iron resistance thermometers and AC resistance *** on this,temperature control was investigated and demonstrated in primary gas thermometry under various working *** optimized parameters,micro-Kelvin level temperature control stability was realized in the temperature region from 5 K to 24.5 *** temperature control stabilities are better than 8μK over 180 h with an integration time of 33.6 s in the concerned temperature range,closing to the limit that the sensors and the instruments can control and *** stabilities were significantly improved about(44±8)%at 24.5 K and(70±7)%at 5 K comparing with our previous work(Chen et al.,Cryogenics,2019,97:1–6).

关键词： temperature control temperature stability temperature resolution rhodium-iron resistance thermometer primary gas thermometry

An acoustical pump capable of significantly increasing pressure ratio of thermoacoustic heat engines

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Chinese Science Bulletin 2006年第8期51卷 1014-1016页

作者： luo ercang HU Jianying DAI Wei CHEN Yuanyuan Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100080 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

Pressure ratio is one of the important parameters for evaluating a thermoacoustic heat en- gine. A so-called acoustical pump, which is capable of significantly increasing pressure ratio of a ther- moacoustic heat engine, is proposed. Its operating principle is given. Also, a verification experiment is done with nitrogen gas in the energy-focused ther- moacoustic heat engine, showing that the pressure ratio increased from 1.25 to 1.47.

关键词：压力比声泵热力工程实验研究

A heat-driven thermoacoustic cryocooler capable of reaching below liquid hydrogen temperature

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Chinese Science Bulletin 2007年第4期52卷 574-576页

作者： HU JianYing luo ercang DAI Wei Zhou Yuan Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100080 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

A "double-gas acoustic amplifier" is introduced to couple a thermoacoustic heat engine and a two-stage pulse tube cooler in this paper. Compared with previous acoustic amplifiers, this new acoustic amplifier maintains the function of amplification for pressure amplitude. In particular, the novel acoustic amplifier with a reservoir makes it possible to install an acoustic transparent but gas blocking elastic membrane between the engine and the cooler. Thus, the engine can use nitrogen as the working gas to work at low frequency; and meanwhile, the cooler can still use helium as the working gas to maintain its high performance. With this new amplifier, the cooling temperature of a two-stage pulse tube cooler driven by an energy-focused thermoacoustic engine reached 18.7 K.

关键词：热驱动热声制冷低温冷却器液氢温度声学放大器

A novel coupling configuration for thermoacoustically-driven pulse tube coolers: Acoustic amplifier

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Chinese Science Bulletin 2005年第18期50卷 2112-2114页

作者： DAI Wei luo ercang HU Jianying CHEN Yanyan Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100080 China Graduate School of Chinese Academy of Sciences Beijing 100039 China

Thermoacoustically-driven pulse tube cooler can provide cryogenic cooling power with no moving com-ponents. Up to now, pulse tube cooler is directly coupled with the thermoacoustic engine and obtainable pressure ratio for the pulse tube cooler is limited by the capability of the ther-moacoustic engine. The authors propose here the concept of acoustic amplifier, which is actually a long tube connecting the engine with the pulse tube cooler. Theoretical calculation shows that suitable length and diameter of the tube can lead to a pressure wave amplification effect which means that pressure wave amplitude coming from the thermoacoustic engine can be much amplified to drive the pulse tube cooler. Based on this, a 2.8 m long copper tube with 8 mm inner diameter is used as the acoustic amplifier in experiments. The experimental results show that due to the amplification effect, pressure wave amplitude at the inlet of the pulse tube cooler is over 2.5 times of that at the engine outlet. Typically, with 1.67 kW heating power, the pressure ratio provided by the engine is 1.11 while at the inlet of the pulse tube cooler the pressure ratio is 1.32, which leads to a lowest no-load temperature of 65.7 K.

关键词：声音放大器脉冲管冷却器压力波

A high-performance ther-moacoustic refrigerator oper-ating in room-temperature range

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Chinese Science Bulletin 2005年第22期50卷 2662-2664页

作者： luo ercang HUANG Yun DAI Wei ZHANG Yong WU Zhanghua Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100080 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

The working principle of an efficient travelling- wave thermoacoustic refrigerator operating in room-tem- perature range has been analyzed and an experimental set-up has been built. The experiment showed that suppress- ing DC-flow streaming was very critical to efficient operation, and an elastic membrane was used to solve the problem suc- cessfully. At the most efficient operating point, the novel thermoacoustic refrigerator achieved a cooling capacity of about 80 W at ?20℃, with a much higher efficiency than previously developed standing-wave thermoacoustic refrig- erator.

关键词：电冰箱空间温度范围行波 DC流程工作原理

A 100 W-class traveling-wave thermoacoustic electricity generator

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Chinese Science Bulletin 2008年第9期53卷 1453-1456页

作者： luo ercang WU ZhangHua DAI Wei LIShanFeng ZHOU Yuan Technical Institute of Physics and Chemistry Chfnese Academy of Sciences Beijing 100080 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

Experimental investigation on a traveling-wave thermoacoustic electricity generator is presented. In the experiment, more than 100 W electrical power was achieved under 2.5 MPa mean pressure, 64 Hz working frequency a... 详细信息

关键词：线性交流发电机热学-声学-电子学转导传输波热能机械