Abstract
In the present work, experimental investigation on laminar combustion of iso-butane-air mixtures was conducted in constant volume explosion vessel. The experiments were conducted at wide range of equivalence ratios ranging between Ф = 0.6 and 1.4 and atmospheric pressure of 0.1 MPa and ambient temperature of 303K. Using spherically expanding flame method, flame parameters including stretched, unstretched flame propagation speeds, laminar burning velocities and Markstein length were calculated. For laminar burning velocities the method of error bars of 95% confidence level was applied. In addition, values of Markstein lengths were measured in wide range of equivalence ratios to study the influence of stretch rate on flame instability and burning velocity. It was found that the stretched flame speed and laminar burning velocities increased with equivalence ratios and the peak value was obtained at equivalence ratio of Ф = 1.1. The Markstein length decreased with the increases in equivalence ratios, which indicates that the diffusion thermal flame instability increased at high equivalence ratios in richer mixture side. However, the total deviations in the laminar burning velocities have discrepancies of 1.2-2.9% for all investigated mixtures.
Highlights
With the rapidly increasing depleting of energy resources and the strengthening of air and ground transportation pollutant legislations, the use of alternative fuels like liquefied petroleum gas (LPG) in engines has attracted more attention [1]
The results show that at low equivalence ratios the flame is more willing to cellular instabilities
Using the expanding flame method, Liao et al [1] explored the effect of preheat temperature and pressure in the laminar flame speed and Markstein length of LPG-air mixtures
Summary
With the rapidly increasing depleting of energy resources and the strengthening of air and ground transportation pollutant legislations, the use of alternative fuels like liquefied petroleum gas (LPG) in engines has attracted more attention [1]. In recent years different studies have been performed to study the laminar burning velocity and Markstein length of propane, LPG, n-butane and iso-butane-air mixtures. Using the expanding flame method, Liao et al [1] explored the effect of preheat temperature and pressure in the laminar flame speed and Markstein length of LPG-air mixtures. Vu et al [7] used same procedure studied the laminar burning velocities of LPG-air mixtures in different pre-heat temperature. Bosschaart et al [9] investigated the laminar burning velocity in mixtures of n-butane, iso-butane-air mixtures using heat flux burner A few reports have studied the convergence of laminar burning velocity data of iso-butane This fuel is not considered as important to determine its flame characteristics. The results obtained from this study will be helpful in validation of chemical kinetic mechanisms and can be used as data base for understanding the behaviour of liquid fuel like gasoline
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