Effect of droplet sizes on evaporation of a bi-component droplet at DME (dimethyl ether)/n-heptane-fueled engine conditions

Ju, Dehao; Zhang, Tingting; Jin, Xiao; Qiao, Xinqi; Huang, Zhen

doi:10.1016/j.energy.2015.04.030

Cited by 17 publications

(3 citation statements)

References 22 publications

(35 reference statements)

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“…In order to change the tense situation of energy supply and demand in China and reduce automobile exhaust pollution, an alternative fuel with extensive sources, mature production technology, good economy and low pollution emissions is urgently needed. Dimethyl ether, as a new alternative fuel for diesel engines in recent years [11][12][13][14][15], has aroused great interest, and related research is increasing and deepening.…”

Section: Clean Alternative Fuel Of Dimethyl Ethermentioning

confidence: 99%

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Recent Studies on Alternative Fuel of Dimethyl Ether

Zhang

2023

Tr Ren Energy

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With the development of industrialization, a large number of non-renewable fuels (such as coal and crude oil) are consumed, and the harmful substances produced in the combustion process of a large number of fossil fuels have caused serious pollution to the atmosphere, and the harmful gases produced by combustion have caused disastrous damage to the ecological balance. Therefore, finding clean energy and exploring alternative fuels are very important in today's society. This paper mainly reviews the studies on the alternative fuels of dimethyl ether (DME). Firstly, the types of alternative fuels currently researched by society and their respective advantages and disadvantages are analyzed, and the preparation of dimethyl ether and its advantages and disadvantages are analyzed in detail. In addition, the physicochemical properties, combustion and emission characteristics of dimethyl ether and diesel are compared and analyzed. The conclusion is that the injection delay angle of dimethyl ether is larger than that of diesel, the ignition delay period is shorter than that of diesel, and the maximum explosion pressure, maximum pressure rise rate and combustion noise of dimethyl ether are lower than that of diesel. The diffusion combustion speed of DME is faster than that of diesel, and the combustion duration is shorter than that of diesel. At the same time, as an alternative energy, dimethyl ether engine has a significant reduction in NOx emission, a very low level of HC and CO emission, and zero soot emission. In conclusion, the DME engine has good performance and emission characteristics.

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Section: Clean Alternative Fuel Of Dimethyl Ethermentioning

confidence: 99%

“…Dimethyl ether fuel comes from a wide range of sources, and can be produced in large quantities from coal, natural gas, coalbed methane, biological organics, etc. [15][16]. The preparation of dimethyl ether can be divided into direct method and indirect method [17].…”

Section: Preparation Of Dimethyl Ethermentioning

confidence: 99%

Recent Studies on Alternative Fuel of Dimethyl Ether

Zhang

2023

Tr Ren Energy

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“…Szekely and Faeth et al [13,14] investigated the evaporation characteristics of JP-10 droplets with initial diameters ranging from 272 µm to 1350 µm at different equivalence ratios, and the results showed that the evaporation rate constant decreased with decreasing droplet diameter. Ju et al [15] combined the UNIQUAC Functional-group Activity Coefficients (UNIFAC) method [16] and the nonequilibrium evaporation law [17,18] to establish a multicomponent evaporation model to predict the evaporation performance of dimethyl ether (DME) droplets with different initial contents. According to the published results, the initial droplet diameter leads to a decrease in the "peak" evaporation rate of both components in the DME/n-heptane droplet.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Effect of the Initial Droplet Diameter on the Evaporation Characteristics of Unsymmetrical Dimethylhydrazine Droplets in a Subcritical Environment

Wu,

Nie,

Yang

et al. 2024

Aerospace

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The evaporation characteristics of unsymmetrical dimethylhydrazine droplets with different initial diameters in a subcritical environment were experimentally investigated with the temperature–pressure separation technique. The evaporation processes of unsymmetrical dimethylhydrazine droplets with different initial diameters in this environment have the same general pattern. All the studied droplets exhibit a short transient heating phase and a steady-state evaporation phase obeying d2. Notably, the expansion of the transient heating phase gradually increases with increasing ambient pressure. The change in diameter squared ∆d2max increases from 1.03% at 1 MPa to 12.48% at 5 MPa. Under subcritical conditions, the evaporation rate decreases linearly with decreasing droplet diameter, and the droplet evaporation lifetime increases linearly. Changes in the initial droplet diameter may still have a large effect on droplets smaller than those studied here. When the ambient pressure is not greater than 3 MPa, the change in the steady-state evaporation time for both medium- and large-diameter droplets accounts for more than 70% of the variation in the droplet evaporation lifetime. As the ambient pressure increases to 4 MPa and 5 MPa, the percentage of the change in the transient heating time contributing to the variation in the droplet evaporation lifetime gradually increases to more than 45%.

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