| Optimization Design |
|
|
|
|
| Research on dynamic performance of double inlet/exhaust piston expander based on dynamic grid technology |
Qihui YU( ),Yanqi GENG(),Licong ZHANG |
| School of Mechanical Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China |
|
|
|
Abstract The distributions of pressure field, temperature field and velocity field of gas in cylinder of the piston expander are difficult to obtain by traditional analytical methods. Therefore, the dynamic performance of the double inlet/exhaust piston expander was studied based on the dynamic grid technology of CFD (computational fluid dynamics). Firstly, the unsteady flow of gas in the cylinder of the double inlet/exhaust piston expander was simulated numerically, and the transient distributions of the pressure field, temperature field and velocity field were obtained. Secondly, the output power test platform of the expander was built, and the simulation values and test values of the output power under multiple working conditions were compared. The error between the two was less than 5.5%, which verified the correctness of the simulation method. Finally, the influences of inlet pressure and inlet temperature on the dynamic performance of expander were analyzed through orthogonal experiment. The results showed that after the compressed air entered the expansion cylinder, the temperature of gas increased rapidly at first, and then decreased continuously after the crankshaft angle was 15°. After opening the exhaust valve, the pressure of gas in the cylinder was higher than the ambient pressure and the residual pressure energy could be recovered. Increasing the inlet temperature could effectively improve the dynamic performance of the expander. When the inlet pressure was 0.5 MPa and the inlet temperature increased from 273 K to 333 K, the output power of the expander increased by 19.8% and the gas energy utilization rate increased by 18.3%. Increasing the inlet pressure, the output power of the expander gradually increased, and the gas energy utilization rate gradually decreased. When the inlet temperature was 273 K, and the inlet pressure increased from 0.5 MPa to 2 MPa, the output power of the expander increased from 0.81 kW to 3.76 kW, and the gas energy utilization rate decreased by 15.3%. The research results provide a theoretical basis for the performance optimization of piston expander.
|
|
Received: 27 October 2023
Published: 04 March 2025
|
|
|
|
Corresponding Authors:
Yanqi GENG
E-mail: yqhhxq@163.com;gengyanqi@163.com
|
基于动网格技术的双进/排气活塞式膨胀机动力性能研究
采用传统的分析方法难以获得活塞式膨胀机气缸内气体的压力场、温度场和速度场分布，因此，基于CFD（computational fluid dynamics，计算流体动力学）动网格技术，研究了双进/排气活塞式膨胀机的动力性能。首先，对双进/排气活塞式膨胀机气缸内气体的非定常流动进行数值仿真，得到其压力场、温度场和速度场的瞬态分布；其次，搭建膨胀机输出功率测试平台，比较多工况下输出功率的仿真值与测试值，得出两者的误差小于5.5%，验证了仿真方法的正确性；最后，通过正交试验，分析了进气压力、进气温度对膨胀机动力性能的影响。结果表明：压缩空气进入膨胀机气缸后，气体温度先快速升高，当曲轴转角为15°后持续下降；打开排气阀后，气缸内气体的压力高于环境压力，可以对剩余压力能进行回收；提高进气温度能有效提高膨胀机动力性能，当进气压力为0.5 MPa、进气温度从273 K升高到333 K时，膨胀机的输出功率增加19.8%，气体能量利用率提高18.3%；提高进气压力，则膨胀机的输出功率逐渐增大，气体能量利用率逐渐减小，当进气温度为273 K、进气压力从0.5 MPa提高到2 MPa时，膨胀机输出功率从0.81 kW增大到3.76 kW，气体能量利用率降低15.3%。研究结果为活塞式膨胀机的性能优化提供了理论依据。
关键词：
活塞式膨胀机,
计算流体动力学,
动网格技术,
流场,
正交试验
|
|
| [1] |
宋兹鹏. 中储国能： 发挥压缩空气储能技术优势 为能源行业提供优质储能资产［J］. 中国商界， 2021（6）： 92-95. doi：10.1016/b978-0-12-820023-0.00003-1
SONG Z P. China National Energy Storage： give full play to the advantages of compressed air energy storage technology to provide high-quality energy storage assets for the energy industry［J］. Business China， 2021（6）： 92-95.
doi: 10.1016/b978-0-12-820023-0.00003-1
|
|
|
| [2] |
吴皓文， 王军， 龚迎莉， 等. 储能技术发展现状及应用前景分析［J］. 电力学报， 2021， 36（5）： 434-443.
WU H W， WANG J， GONG Y L， et al. Development status and application prospect analysis of energy storage technology［J］. Journal of Electric Power， 2021， 36（5）： 434-443.
|
|
|
| [3] |
刘祯， 吴华伟， 张琎， 等. 压缩空气储能用涡旋膨胀机非稳态流动特性分析［J］. 储能科学与技术， 2019， 8（2）： 357-364.
LIU Z， WU H W， ZHANG J， et al. Numerical investigations on unsteady flow of a scroll expander for compressed air energy storage［J］. Energy Storage Science and Technology， 2019， 8（2）： 357-364.
|
|
|
| [4] |
熊亚选， 王楠， 徐鹏， 等. 膨胀机燃气调压的发电性能研究［J］. 煤气与热力， 2021， 41（4）： 58-63， 70， 101.
XIONG Y X， WANG N， XU P， et al. Research on power generation performance of expander gas pressure regulation［J］. Gas &； Heat， 2021， 41（4）： 58-63， 70， 101.
|
|
|
| [5] |
PING X， YANG F B， ZHANG H G， et al. Prediction and optimization of power output of single screw expander in organic Rankine cycle （ORC） for diesel engine waste heat recovery［J］. Applied Thermal Engineering， 2021， 182： 116048.
|
|
|
| [6] |
BAO J J， ZHAO L. A review of working fluid and expander selections for organic Rankine cycle［J］. Renewable and Sustainable Energy Reviews， 2013， 24： 325-342.
|
|
|
| [7] |
伍淼， 陈湘萍. 有机朗肯循环综述［J］. 电子世界， 2017（17）： 5-6.
WU M， CHEN X P. Review of organic Rankine cycle［J］. Electronics World， 2017（17）： 5-6.
|
|
|
| [8] |
YANG F B， ZHANG H G， HOU X C， et al. Experimental study and artificial neural network based prediction of a free piston expander-linear generator for small scale organic Rankine cycle［J］. Energy， 2019， 175： 630-644.
|
|
|
| [9] |
PETERSON R B， WANG H， HERRON T. Performance of a small-scale regenerative Rankine power cycle employing a scroll expander［J］. Proceedings of the Institution of Mechanical Engineers， Part A： Journal of Power and Energy， 2008， 222（3）： 271-282.
|
|
|
| [10] |
MIKIELEWICSZ D， MIKIELEWICZ J， WAJS J. Experiences from operation of different expansion devices for application in domestic micro CHP［J］. Archives of Thermodynamics， 31（4）： 3-13.
|
|
|
| [11] |
QIU G Q， SHAO Y J， LI J X， et al. Experimental investigation of a biomass-fired ORC-based micro-CHP for domestic applications［J］. Fuel， 2012， 96： 374-382.
|
|
|
| [12] |
SUN X， ZHANG J J， WANG Y， et al. Optimization of capacity control of reciprocating compressor using multi-system coupling model［J］. Applied Thermal Engineering， 2021， 195： 117175.
|
|
|
| [13] |
李宏阳. 浅谈空分装置膨胀机切换实践与问题处理［J］. 中国设备工程， 2021（8）： 71-72.
LI H Y. Discussion on switching practice and problem handling of expander in air separation unit［J］. China Plant Engineering， 2021（8）： 71-72.
|
|
|
| [14] |
刘嘉豪， 王星， 张雪辉， 等. 压缩空气储能系统膨胀机调节级配气特性数值研究［J］. 储能科学与技术， 2020， 9（2）： 425-434.
LIU J H， WANG X， ZHANG X H， et al. Numerical study on the air distribution characteristics of the turbine regulating stage in a compressed air energy storage system［J］. Energy Storage Science and Technology， 2020， 9（2）： 425-434.
|
|
|
| [15] |
FARZANEH-GORD M， IZADI S， PISHBIN S I， et al. Thermodynamic analysis of medium pressure reciprocating natural gas expansion engines［J］. Polish Journal of Chemical Technology， 2015， 17（2）： 119-125.
|
|
|
| [16] |
ZHANG X J， XU Y J， XU J， et al. Study of a single-valve reciprocating expander［J］. Journal of the Energy Institute， 2016， 89（3）： 400-413.
|
|
|
| [17] |
WRONSKI J， IMRAN M， SKOVRUP M J， et al. Experimental and numerical analysis of a reciprocating piston expander with variable valve timing for small-scale organic Rankine cycle power systems［J］. Applied Energy， 2019， 247： 403-416.
|
|
|
| [18] |
TENISSARA N， THEPA S， MONYAKUL V. Simulation， construction and evaluation of cheap piston expander for low-pressure power generation by compressed air as working fluid［J］. Energy， 2018， 142： 655-665.
|
|
|
| [19] |
XU Q Y， CAI M L， SHI Y. Dynamic heat transfer model for temperature drop analysis and heat exchange system design of the air-powered engine system［J］. Energy， 2014， 68： 877-885.
|
|
|
| [20] |
顾加春， 谢晓敏. 压缩空气动力发动机的仿真与研究［J］. 机电一体化， 2014， 20（12）： 9-14， 22.
GU J C， XIE X M. Simulation and research of an air-powered engine［J］. Mechatronics， 2014， 20（12）： 9-14， 22.
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
