Design and Combustion Characteristic Analysis of Free Piston Stirling Engine External Combustion System

doi:10.1007/s12204-018-2022-x

摘要/Abstract

摘要： The free piston Stirling engine external combustion system was simulated to investigate the diesel-air combustion characteristics in order to demonstrate its feasibility by computational fluid dynamics (CFD). The different effects on combustion were distinguished by analyzing the combustion burner, the injection position of diesel oil, the front tube arrangement of Stirling heater head and the back fin. The results show that the tilted front tube arrangement of the heater head with the back fin is the best practicable technology while the distance between the diesel nozzle position and the swirler top is 0. Its total heat flux is 15.6 kW, and the average heat transfer coefficients of the front and back tubes are 127W/(m2 ·K) and 192W/(m2 ·K), respectively. The heat transfer is mainly through convection, and the proportion of radiative heat transfer is only 16.9%. The best combustion efficiency of the free piston Stirling engine external combustion system is 86%.

关键词: Stirling engine, external combustion system, numerical simulation, diesel-air combustion

Abstract: The free piston Stirling engine external combustion system was simulated to investigate the diesel-air combustion characteristics in order to demonstrate its feasibility by computational fluid dynamics (CFD). The different effects on combustion were distinguished by analyzing the combustion burner, the injection position of diesel oil, the front tube arrangement of Stirling heater head and the back fin. The results show that the tilted front tube arrangement of the heater head with the back fin is the best practicable technology while the distance between the diesel nozzle position and the swirler top is 0. Its total heat flux is 15.6 kW, and the average heat transfer coefficients of the front and back tubes are 127W/(m2 ·K) and 192W/(m2 ·K), respectively. The heat transfer is mainly through convection, and the proportion of radiative heat transfer is only 16.9%. The best combustion efficiency of the free piston Stirling engine external combustion system is 86%.

Key words: Stirling engine, external combustion system, numerical simulation, diesel-air combustion

中图分类号:

TK 16

JIN Xudong (金旭东), Lü Tian (吕田), YU Guoyao (余国瑶), LIU Jiawei (刘佳伟), HUANG Xiaoyu. Design and Combustion Characteristic Analysis of Free Piston Stirling Engine External Combustion System[J]. Journal of Shanghai Jiao Tong University (Science), 2018, 23(Sup. 1): 50-55.

JIN Xudong (金旭东), Lü Tian (吕田), YU Guoyao (余国瑶), LIU Jiawei (刘佳伟), HUANG Xiaoyu (黄晓宇). Design and Combustion Characteristic Analysis of Free Piston Stirling Engine External Combustion System[J]. Journal of Shanghai Jiao Tong University (Science), 2018, 23(Sup. 1): 50-55.

参考文献 16

[1]	KONGTRAGOOL B, WONGWISES S. Performanceof a twin power piston low temperature differentialStirling engine powered by a solar simulator [J]. SolarEnergy, 2007, 81(7): 884-895.
[2]	SONG Z C, CHEN J M, YANG L. Heat transferenhancement in tubular heater of Stirling engine forwaste heat recovery from flue gas using steel wool [J].Applied Thermal Engineering, 2015, 87: 499-504.
[3]	SOLOMON L, QIU S G. Computational analysis ofexternal heat transfer for a tubular Stirling convertor[J]. Applied Thermal Engineering, 2018, 137: 134-141.
[4]	LI K, YU G Y, ZHANG Y B, et al. Research on 1kW class free piston Stirling generator [J]. Journal ofEngineering Thermophysics, 2014, 35(7): 1270-1274(in Chinese).
[5]	WU J M, YU G Y, DAI W, et al. Performance ofthe CHP system by using a 5 kW(e) class free pistonStirling generator [J]. Proceeding of the CSEE, 2018,38(11): 3275-3280 (in Chinese).
[6]	YE Y Y, LAN J, L¨U T, et al. Numerical study onflameless oxy-diesel combustion in Stirling engine combustor[J]. Ship Science and Technology, 2016, 38(10):84-88 (in Chinese).
[7]	KIM S Y, HUTH J, WOOD J G. Performance characterizationof sunpower free-piston Stirling engines[C]//3rd International Energy Conversion EngineeringConference. San Francisco, CA, USA: AIAA, 2005: 1-6.
[8]	WONG W A, WILSON S, COLLINS J. AdvancedStirling convertor (ASC) development for NASA RPS[C]//3rd International Energy Conversion EngineeringConference. Cleveland, OH, USA: AIAA, 2013: 1-11.
[9]	QIU S G, REDINGER D L, AUGENBLICK J E. Thenew generation infinia free-piston Stirling engine formicro-CHP and remote power applications [C]//3rdInternational Energy Conversion Engineering Conference.San Francisco, CA, USA: AIAA, 2005: 1-11.
[10]	SCHREIBER J G. Summary of Stirling convertor testingat NASA Glenn Research Center [C]//4th InternationalEnergy Conversion Engineering Conference. SanDiego, CA, USA: AIAA, 2006: 1-14.
[11]	LI T, TANG D W, LI Z G, et al. Development andtest of a Stirling engine driven by waste gases for themicro-CHP system [J]. Applied Thermal Engineering,2012, 33/34: 119-123.
[12]	ARASHNIA I, NAJAFI G, GHOBADIAN B, et al.Development of micro-scale biomass-fuelled CHP systemusing Stirling engine [J]. Energy Procedia, 2015,75: 1108-1113.
[13]	DAMIRCHI H, NAJAFI G, ALIZADEHNIA S, et al.Micro combined heat and power to provide heat andelectrical power using biomass and Gamma-type Stirlingengine [J]. Applied Thermal Engineering, 2016,103: 1460-1469.
[14]	MURUGAN S, HORAK B. A review of micro combinedheat and power systems for residential applications[J]. Renewable & Sustainable Energy Reviews,2016, 64: 144-162.
[15]	SHIH T H, LIOU W W, SHABBIR A, et al. A new k-εeddy viscosity model for high reynolds number turbulentflows [J]. Computers & Fluids, 1995, 24(3): 227-238.
[16]	JIN X D, ZHOU Y G. Numerical analysis on microscopiccharacteristics of pulverized coal moderate andintense low-oxygen dilution combustion [J]. Energy &Fuels, 2015, 29(5): 3456-3466.