Abstract
In order to investigate the effects of fuel distribution on the operation of two-phase pulse detonation engine (PDE), a series of cold flow and multicycle PDE experiments was carried out with 9 mixing schemes. Homogeneity degree with fuel distribution considered in terms of space and time was proposed to quantitatively evaluate the mixing of liquid fuel and air by particle image velocimetry (PIV) in cold flow experiments. Operation stability of multicycle PDE was presented by statistical analysis of peak pressure at the outlet of a detonation tube. The relationship between operation stability and homogeneity degree was quantitatively elaborated. These experimental results indicated that not only using mixing reinforcement devices (such as pore plate and reed valve) was fuel distribution improved but also the effect of inlet ways on the homogeneity degree was weakened. The homogeneity degree of fuel distribution ζ=0.72 was a critical value for stable working of multicycle PDE. When homogeneity degree was lower than 0.72, stable state was not maintained and detonation wave in some cycles was not established due to poor fuel distribution. Therefore, it is necessary to hold homogeneity degree larger than 0.72 to achieve stable operation of PDE. These results contribute to enhancing the operation stability and offering guidelines for the design of PDE’s mixing scheme.
Highlights
Pulsed detonation engine (PDE) obtains thrust by intermittent detonation wave
When homogeneity degree ζ is larger than 0.72, ζ has a small impact on the operation stability of multicycle PDE, and the operation stability slightly increases with the increase of ζ, whereas as ζ is lower than 0.72, ζ has a significant influence and the operation stability rapidly declines with the decrease of ζ
This work first quantitatively investigated the effect of the homogeneity degree of mixture on the operation stability of multicycle PDE by particle image velocimetry (PIV) with 9 mixing schemes
Summary
Pulsed detonation engine (PDE) obtains thrust by intermittent detonation wave. Numerous theoretical, experimental, and numerical studies were carried out since PDE poses higher thermodynamic efficiency [1]. JP10-O2/air, and specific impulse Ispf of the PDE initially fueled with gaseous fuel was higher (1-5%) than the Ispf of a PDE initially fueled with a multiphase JP10-O2/air mixture It has been demonstrated in these studies that improving initial atomization and vaporization levels of liquid fuel could provide a benefit to the performance of PDE. Helfrich et al [18] studied the effect of fuel temperature on PDE’s performance with different liquid fuels by the concentric tube heat exchanger In their works, for all fuels except JP-10, increasing the fuel injection temperature leads to the decrease of both DDT (deflagration-todetonation transition) time (by 15%) and detonation distance (by up to 30%) but causes the increase of detonation percentage by up to 180% and barely affects the ignition time. A series of multicyclic two-phase PDE experiments was carried out with 9 mixing strategies to quantitatively investigate the effect of two-phase mixture homogeneity on two-phase PDE operation
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