Abstract
In the present investigation the explosion characteristics of 30% H2/70% CH4-blended fuels have been experimentally studied in different turbulent environments. Some important indicators about the explosion characteristics, including maximum explosion pressure (pmax), explosion duration (tc), maximum rate of pressure rise ((dp/dt)max), deflagration index (KG), and fast burn period (tb) have been studied. Furthermore, the influences of turbulent intensity associated with the equivalence ratio on explosion characteristics have been compressively analysed. The results indicated that, with the increase of turbulent intensity (u’rms), the value of pmax will be correspondingly raised while the equivalent ratio (φ) corresponding to the peak value of pmax gradually changes from stoichiometric to 1.2. Based upon the value of pmax in laminar condition, the growth extent of pmax monotonically rises to u’rms, but under a same u’rms the growth extent of pmax first declines and then rises with the increase of φ in the rage of 0.6 to 1.2. Under a laminar environment, the peak value of (dp/dt)max is attained at φ = 1.0; although such a conclusion is maintained in the studied range of turbulent intensity, the difference on the value of (dp/dt)max between φ = 1.0 and φ = 1.2 is obviously reduced with the increase of u’rms. Meanwhile, from the variation of KG, it could be found that turbulence can raise the hazardous potential of disaster. With the increase of u’rms, both the values of tc and tb reduce, the quota of tb in the explosion performs a similar regulation, but the detailed variation extent is also controlled by u’rms.
Highlights
Facing to the depletion of fossil fuels and the deterioration of the environment, clean alternative fuel(s) has become one hot topic in the scientific field of energies, among which the blended fuels of hydrogen and methane have been regarded as some popular options [1,2,3]
Some scholars contributed into the research about explosion characteristics of blended fuels, including blended fuels of pentane, hexane, and benzene [4], blended fuels of methane and carbon dioxide [5], blended fuels of liquefied petroleum gas [6], blended fuels of hydrogen and nitrogen oxides [7], the blended fuels of hydrogen and dust [8], the blended fuels of natural gas, argon, and nitrogen gas [9], blended fuels of n-alkane and nitrous oxide [10], blended fuels of butanol and octane [11], hydrogen/carbon monoxide blended fuels [12], blended fuels of hydrogen and methane [13]
Aiming at providing valuable information to acknowledge turbulent explosion characteristics and improve the current theory of premixed explosions, a series of experiments were performed on the explosion of blended fuels of hydrogen/methane with the volume fraction ratio of 30/70 within a weak turbulent environment in a spherical confined space
Summary
Facing to the depletion of fossil fuels and the deterioration of the environment, clean alternative fuel(s) has become one hot topic in the scientific field of energies, among which the blended fuels of hydrogen and methane have been regarded as some popular options [1,2,3]. In the research conducted by Shen et al, the experiments were conducted in a 20 L spherical explosion vessel, and the spherical space ensures the propagation of blast wave is even in each direction from the ignition location to the vessel’s inner wall Learning from their experiences, we conducted our research in a spherical explosion vessel with a similar size for a comparability on the obtained results. Aiming at providing valuable information to acknowledge turbulent explosion characteristics and improve the current theory of premixed explosions, a series of experiments were performed on the explosion of blended fuels of hydrogen/methane with the volume fraction ratio of 30/70 within a weak turbulent environment in a spherical confined space. The five essential indicators reflecting explosion characteristics—maximal explosion pressure, the maximal rise rate of explosion pressure, explosion duration, fast explosion period, and deflagration index—have been taken as the objects to examine the detailed influences on a turbulent premixed explosion
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