Tailoring the flash-boiling spray structure through the control of plume-to-plume interaction

2021 ◽  
Author(s):  
Qinglin Xu ◽  
Shangze Yang ◽  
Di Xiao ◽  
Xuesong Li ◽  
Min Xu
Keyword(s):  
Spray Structure ◽  
Flash Boiling

Study of spray structure from non-flash to flash boiling conditions with space-time tomography

2020 ◽  
Author(s):  
Jianguo Du ◽  
Guangming Zang ◽  
Balaji Mohan ◽  
Ramzi Idoughi ◽  
Jaeheon Sim ◽  
...  
Keyword(s):  
Space Time ◽  
Spray Structure ◽  
Flash Boiling

Effects of nozzle hole configuration of a multi-hole type gasoline direct injector on spray development under flash boiling conditions

2020 ◽  
pp. 146808742096002
Author(s):  
Donghwan Kim ◽  
Sungwook Park
Keyword(s):  
Ambient Pressure ◽  
Mie Scattering ◽  
Prediction Equation ◽  
Width Ratio ◽  
Fuel Temperature ◽  
Spray Structure ◽  
Closed Type ◽  
Nozzle Hole ◽  
Flash Boiling ◽  
Overlapped Region

The flash boiling phenomenon is critically affected by not only injection conditions such as fuel temperature, ambient pressure and physical properties of fuel but also the nozzle hole configurations of the injector. In this research, two kinds of injectors, having different nozzle hole configurations (a closed type and a opened type) were used to analyze the influence of flash boiling. Near-field and far-field spray visualization was performed using a high-speed camera based on the Mie-scattering imaging technique. Test parameters were injection pressure, ambient pressure, and fuel temperature. The spray length, spray width, length-to-width ratio, and axial velocity of spray development depending on time were measured using the MATLAB program for quantitative and objective analysis. Finally, the prediction equation for the spray length was derived using the least-squares method based on the experimental results. In the case of the closed type injector, the spray center contained a wide overlapped region because of the strong links between plumes. On the other hand, with the opened type injector, there was a relatively narrow overlapped region between plumes due to weak interaction between plumes. As a result, the closed type injector had a narrow and long spray structure and the opened type injector had a partially long and wide spray structure. According to the prediction equation, the spray develops depending on time more linearly under flash boiling conditions than under non-flash boiling conditions. The influence of flash boiling was smaller in the closed type injector because the closed type injector has less variation of the spray structure with varying injection conditions, ranging from non-flash boiling conditions to non-flash boiling conditions.

Spray structure as generated under homogeneous flash boiling nucleation regime

2014 ◽  
Vol 73 (1) ◽  
pp. 416-423 ◽  
Author(s):  
M. Levy ◽  
Y. Levy ◽  
E. Sher
Keyword(s):  
Spray Structure ◽  
Flash Boiling

scholarly journals Experimental study on flash-boiling spray structure of multi-hole gasoline direct injection injector in a constant volume chamber

2020 ◽  
Vol 12 ◽  
pp. 175682772093243
Author(s):  
Jian Wu ◽  
Jiakun Du ◽  
Hong Chen ◽  
Yuhuai Li ◽  
Wenfeng Zhan ◽  
...  
Keyword(s):  
Optical Measurement ◽  
Ambient Pressure ◽  
Direct Injection ◽  
Measurement Techniques ◽  
Gasoline Direct Injection ◽  
Fuel Temperature ◽  
Droplet Distribution ◽  
Spray Structure ◽  
Significant Difference ◽  
Flash Boiling

The macroscopic and microscopic characteristics of flash-boiling spray were experimentally investigated with various optical measurement techniques. The effects of ambient pressure and fuel temperature on flash-boiling characteristics in multi-hole gasoline direct injection injector were analyzed. The analysis was focused on the spray structure and atomization droplet size distributions. In order to increase the understanding of the flash-boiling spray targeting, three injectors with different spray patterns were investigated under strong flash-boiling condition. The results show that ambient pressure and fuel temperature have significant influence on flash boiling. Both lower ambient pressure and higher fuel temperature could accelerate the flash-boiling process. For the macroscopic characteristics, similar influences could be found with the ambient pressure decreased by 0.4 bar and the fuel temperature increased by 10°C. Further, significant difference could be found within cold-jet spray and strong flash-boiling spray, such as the spatial structure. The spray structure always turns from hollow cone into solid when flash boiling occurs. With a higher fuel superheat degree, the spray droplet distribution moves toward smaller sizes and let the larger droplets reduce due to the promotion of atomization. For the strong flash-boiling spray, the Sauter mean diameter has decreased by 50% compared with cold-jet spray. There is a corresponding relationship between collapsed flash-boiling spray target and weighted geometric center of the injector. Spray collapse could be avoided by increasing the plume distance.

EXPERIMENTAL INVESTIGATION OF NEAR NOZZLE SPRAY STRUCTURE AND VELOCITY FOR A GDI HOLLOWCONE SPRAY

2010 ◽  
Vol 20 (12) ◽  
pp. 1065-1076 ◽  
Author(s):  
D. Martin ◽  
M. Cardenas ◽  
Philipp Pischke ◽  
R. Kneer
Keyword(s):  
Experimental Investigation ◽  
Spray Structure

scholarly journals Three-dimensional Simulation and Analysis of Spray Structure inVertical MOCVD Reaction Chamber

2020 ◽  
Vol 585 ◽  
pp. 012183
Author(s):  
Liu Changjiang ◽  
Li Zhiming ◽  
Guo Runqiu ◽  
Feng Lansheng ◽  
YangShun Tao
Keyword(s):  
Three Dimensional ◽  
Reaction Chamber ◽  
Spray Structure ◽  
Dimensional Simulation
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