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This paper investigates the effects of glycerol ethoxylate as an ignition improver on injection and combustion characteristics of hydrous ethanol under a CI engine condition. Injection characteristics were investigated by an in-house injection rate measurement device based on the Zeuch method, while spray combustion has been performed in the rapid compression and expansion machine (RCEM). The CI engine...
This research is to study the characteristics of cellular premixed flames that are investigated on ceramic porous board with CH4/C2H6/CO2 mixtures (main compositions of natural gas in Thailand). Cellular flames are the phenomena caused by intrinsic instability induced by thermal expansion and of diffusive thermal instability due to preferential diffusion of mass versus heat. In lean combustion premixed...
Three different imaging techniques were utilized to study the laminar, impinging, multiple, premixed liquefied petroleum gas (LPG)–air flames for simulating the premixed impinging flames of practical cooking burners. Two line-of-sight observation techniques are introduced, i.e. direct photography of a typical visible flame and the imaging of flame chemiluminescence, whereas the spatially resolved...
This study focused on the effects of the use of hydrous ethanol with high water contents up to 40% on the performance and emissions of a small spark ignition engine for a generator. The effects of loads and ethanol water contents on engine performance and emissions were investigated. The results show that for ethanol with 5% water content (Eh95) at constant engine speed of 3600rpm and at stoichiometric...
This work reports design and development of a SPMB (self-aspirating porous medium burner) for replacing the self-aspirating, CB (conventional gaseous fuel, free flame burners), which are widely used in heating process of SMEs (small and medium scale enterprises) in Thailand but they have relatively low thermal efficiency of about 30 percent. Design of the SPMB relies on the same important characteristics...
A thermal performance of impinging flames of widely-used cooker-top burners depends on a complex interaction between flow field and combustion. The critical situation is placed on two typical cooker-top burners having almost the same configurations, but yielding about 10% point difference in thermal efficiency. Therefore, in situ flame measurements of averaged velocity using particle image velocimetry...
Experimental and theoretical investigations of primary air entrainment characteristics of a self-aspirating burner are presented. Emphasis was made on experiments, which were performed using both hot and cold tests; and a correlation between them is proposed. The level of primary air entrainment is measured using an oxygen sensor and a particle image velocimetry system. Experimental results are used...
Cooker-top burners are used extensively in Thailand because of the rapid combustion and high heating-rates created by an impinging flame, which is characteristic of these types of burners. High thermal efficiency with low level of CO emissions is the most important performance criteria for these burners. The wide variation in reported performances of the burners appears to be due to the ad hoc knowledge...
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