Experimental study on detonation parameters and cellular structures of fuel cloud |
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Authors: | Li-Feng Xie Bin Li and Yu-Lei Zhang |
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Institution: | Li-Feng Xie Bin Li Yu-Lei Zhang School of Chemical Engineering,Nanjing University of Science and Technology,210094 Nanjing,China |
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Abstract: | In this paper, detonation parameters of fuel cloud, such as propylene oxide (PO), isopropyl nitrate (IPN), hexane, 90# oil and decane were measured in a self-designed and constructed vertical shock tube. Results show that the detonation pressure
and velocity of PO increase to a peak value and then decrease smoothly with increasing equivalence ratio. Several nitrate
sensitizers were added into PO to make fuel mixtures, and test results indicated that the additives can efficiently enhance
detonation velocity and pressure of fuel cloud and one type of additive n-propyl nitrate (NPN) played the best in the improvement.
The critical initiation energy that directly initiated detonation of all the test liquid fuel clouds showed a U-shape curve
relationship with equivalence ratios. The optimum concentration lies on the rich-fuel side (ϕ > 1). The critical initiation energy is closely related to molecular structure and volatility of fuels. IPN and PO have similar
critical values while that of alkanes are larger. Detonation cell sizes of PO were respectively investigated at 25°C, 35°C
and 50°C with smoked foil technique. The cell width shows a U-shape curve relationship with equivalence ratios at all temperatures.
The minimal cell width also lies on the rich-fuel side (ϕ > 1). The cell width of PO vapor is slightly larger than that of PO cloud. Therefore, the detonation reaction of PO at normal
temperature is controlled by gas phase reaction. |
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Keywords: | Cloud detonation Detonation velocity Detonation pressure Critical initiation energy Cell size |
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