Study of Effect of the Residual Gas Fraction on Burning Velocity of Hydrogen-Isooctane

Bijan, Mehdi and Abdi Aghdam, Ebrahim (2015) Study of Effect of the Residual Gas Fraction on Burning Velocity of Hydrogen-Isooctane. Masters thesis, University of Mohaghegh Ardabili.

Text (مطالعه تاثیر کسر گازهای سوخته روی سرعت سوختن هیدروژن-ایزواکتان) Mehdi Bijan.pdf Download (1MB)

Abstract

The presence of burned gas in combustion mixtures is important cases which have considerable influence on mixture characteristics such as burning velocity. Therefore, the evaluation of burning gases fraction is regarded. In the present study, the spherical thermal bomb in constant volume is used in order to measure of burning velocity of hydrogen-isooctane-air with residual gases in different equivalence ratios and different mass percentages of hydrogen and different fractions of residual gases. At first, for validating of experiments, several tests by using the hydrogen- pure air mixture is performed, so the reliability of experimental data is carried out with the other researchers work. Good agreement was observed between the obtained results with the correlation suggested by Dahoe at el, although some differences were seen with the correlation reported by Iijima at el. correlation formula as u_l=u_l0 (T/T_0 )^α (P/P_0 )^βwas applied to the obtained experimental data of H_2-air mixture and residual gases at three equivalence ratios (0.8, 0.9, 1.0) and three fraction burned gases 0.0, 0.1 and 0.2 is employed and α,β and u_l0 were determined such as equivalence ratios and fraction burned gases. In the case of experiments, mass basis was used for hydrogen and the volume basis is used residual gases amount; and mixture with 5, 10 and 20% H_2 at the three equivalence ratio of 0.8, 0.9 and 1 is used at initial condition of 1 and 1.5 bars. Several tests were performed for each possible state and the recorded pressure variation is used to determine the burning velocity by thermodynamic calculation code. According on the method, reliable ranges of data of each test were sorted and the range of pressure and temperature are obtained 1.0 to 4.6 bar and 358 to 495 kelvin respectively. The results show that given equivalence ratio and mass percentages of hydrogen with increasing of volume fraction 0.1 to 0.2 causes the burning velocity is attached 27% to 52% in relate to mixture of hydrogen-Iso-octane fuel.

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