On Premixed Gas Fuelled Stirling Engine Combustors with Combustion Gas Recirculation

Research output: ThesisDoctoral Thesis (compilation)


The main objective in the research described in this thesis was to design and test the use of lean premixed combustion using combustion gas recirculation for gas fuelled Stirling engine combustors. A system using a flame-arrester type of flame-holder to stabilize the flame and an ejector system for the recirculation of combustion gas was designed and tested in the laboratory. The impact of changes in different parameters of the ejector system was examined. Different combinations of recirculation rate and air/fuel ratio were examined regarding their impact on emissions and flame stability.

The laboratory combustion system was then adapted to commercial combustors. A propane combustion system for a hybrid sodium heat pipe solar receiver for the SOLO 161 Stirling engine was designed, built and field-tested with good results. Later a natural gas combustor for a SOLO 161 combined heat and power Stirling engine unit was designed, built and field-tested with good results. The combustor has currently run about 2500 hours in field test. At lambda 1.4 the NOX emissions are about 15 ppm, with no emissions of unburnt hydrocarbons (HC).

Tests have been made with a catalytically coated solar receiver for the V160 Stirling engine with the objective to use catalytic combustion on the heater surface to supply heat to the Stirling cycle. The results were promising and it was possible to heat the receiver to operating temperature and run the engine for shorter times. However, further research is needed before this type of heater can be used.


  • Magnus Pålsson
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Other Mechanical Engineering


  • vibration and acoustic engineering, Maskinteknik, vakuumteknik, vibrationer, akustik, Motors and propulsion systems, Motorer, framdrivningssystem, hydraulik, Mechanical engineering, hydraulics, vacuum technology, termodynamik, Termisk teknik, applied thermodynamics, Thermal engineering, heat pipe, ejector, solar energy, CGR, recirculation, EGR, catalytic combustion, premix combustion, Stirling engine, combustor
Original languageEnglish
Awarding Institution
Supervisors/Assistant supervisor
  • [unknown], [unknown], Supervisor, External person
Award date2002 May 3
  • Division of Combustion Engines, Lund Institute of Technology
Print ISBNs91-628-5227-2
Publication statusPublished - 2002
Publication categoryResearch

Bibliographic note

Defence details Date: 2002-05-03 Time: 10:15 Place: Room M:A, in the M-building, Ole Römers väg 1, Lund, Sweden External reviewer(s) Name: Hustad, Johan E Title: [unknown] Affiliation: Norges Teknisk-Naturvitenskaplige Universitet, Tromdheim, Norway --- Article: Design and Testing of Stirling Engine Premix CGR Combustor for Ultra Low Emissions Article: Neural Networks for Air-Fuel Estimation and Burner Control in a Micro-Cogen System Article: Hybrid Sodium Heat Pipe Receiver for Dish/Stirling Systems - Design and Test Results Article: Hybrid Dish/Stirling Systems: Combustor and Heat Pipe Receiver Development Article: Development of a LPP CGR Combustion System with Ultra-Low Emissions for a SOLO161 Stirling Engine Based Micro-CHP Unit Article: Development and Field Test of a SOLO 161 Stirling Engine based Micro-CHP Unit with Ultra-Low Emissions Article: First Trials with Direct Catalytic Combustion on the Heater Surface of a V160 Stirling Engine