INTERNAL FLOW PATTERN AND MACROSCOPIC CHARACTERISTICS OF A FLASH-BOILING SPRAY ACTUATED THROUGH A TWIN-ORIFICE ATOMIZER WITH LOW INJECTION PRESSURE

2016 ◽  
Vol 26 (4) ◽  
pp. 377-410 ◽  
Author(s):  
Dehao Ju ◽  
Chunhai Wang ◽  
Xinqi Qiao ◽  
Jin Xiao ◽  
Zhen Huang
Keyword(s):  
Flow Pattern ◽  
Injection Pressure ◽  
Internal Flow ◽  
Flash Boiling

Macroscopic characteristics and internal flow pattern of dimethyl ether flash-boiling spray discharged through a vertical twin-orifice injector

Energy ◽  
2016 ◽  
Vol 114 ◽  
pp. 1240-1250 ◽  
Author(s):  
Dehao Ju ◽  
Zhong Huang ◽  
Xiaoxu Jia ◽  
Xinqi Qiao ◽  
Jin Xiao ◽  
...  
Keyword(s):  
Flow Pattern ◽  
Dimethyl Ether ◽  
Internal Flow ◽  
Flash Boiling

Study on cyclic variation rate of fuel flow in the nozzle during fuel injection

2021 ◽  
Vol 13 (2-3) ◽  
pp. 113-123
Author(s):  
Wen Hua ◽  
Zhang Xin-yu ◽  
Jiang Yu-long ◽  
Zhao Ling-yao
Keyword(s):  
Diesel Engine ◽  
Flow Pattern ◽  
Working Condition ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Cyclic Variation ◽  
Injection Nozzle ◽  
Fuel Flow ◽  
Variation Rate ◽  
The Difference

The fuel flow pattern in the fuel injection nozzle of diesel engine is a complex and changeable phenomenon, which is easily affected by various factors, bringing the differences of flow patterns between multiple injection cycles. To solve the above problem, a visual experimental platform of fuel injection nozzle was built, in which the 100 injection cycles of diesel engine on the same working condition were photographed via shadowgraphy to study the difference in fuel flow pattern in the nozzle by ensemble average processing method. The cyclic variation rate K of fuel flow pattern is defined. Results demonstrate that the fuel flow pattern tends to be the same in multiple fuel injection cycles, but there is a strong randomness at the starting of injection and after ending of injection; the K can be reduced by decreasing the injection pressure and the inclination angle of orifice, so that the fuel flow pattern in the nozzle tends to be consistent.

Numerical simulation and experiment for study on internal flow pattern of vortex pump

2019 ◽  
Vol 36 (5) ◽  
pp. 1579-1596
Author(s):  
Hui Quan ◽  
Yi Chai ◽  
Rennian Li ◽  
Jianhui Guo
Keyword(s):  
Flow Pattern ◽  
Theoretical Foundation ◽  
Internal Flow ◽  
Content Type ◽  
Vortex Pump ◽  
Hydraulic Design ◽  
Through Flow ◽  
Simulation And Experiment ◽  
Flow Through ◽  
Working Out

Purpose The special structure of the vortex pump contributes to its complex internal flow pattern. A type of horizontal 150WX-200-20 vortex pump is taken as a research subject to deeply study the progression and distribution of flow pattern in its channel. To explain the mechanism of flow in this pump, numerical analysis of the whole flow and experiment have been conducted. Design/methodology/approach The authors studied and analyzed the distribution and evolution of flow pattern under different flow, such as circulating-flow, through-flow and other forms. Finally, a model of flow pattern in the vortex pump has been built, which has more perfectly fit the reality. Findings They are through-flow affected by circulating-flow, main and subsidiary circulating-flow, vortices between vanes and other vortices (or liquid impingement) in volute. Entering the pump, part of the flow stays in vanes and turn into vortices while the other goes into the front chamber. The flow that runs into the front chamber will be divided into two parts. One part will be collected by viscosity into a vortex rope when it passing through the interface between the impeller and the vaneless chamber, which closely relates to the circulating-flow, and the rest directly goes out of the field through the diffuser. Besides, a fraction of circulating-flow joins the through-flow when it goes through the section V and leaves the pump. Originality/value The research results build a theoretical foundation for working out the flow mechanism of the vortex pump, improving its efficiency and optimizing its hydraulic design.

Detailed Flow Investigations Within a High-Speed Centrifugal Compressor Impeller

1976 ◽  
Vol 98 (3) ◽  
pp. 390-399 ◽  
Author(s):  
D. Eckardt
Keyword(s):  
Flow Field ◽  
Flow Pattern ◽  
High Speed ◽  
Internal Flow ◽  
Suction Side ◽  
Turbulence Structure ◽  
Wake Interaction ◽  
Compressor Impeller ◽  
Channel Curvature ◽  
Relative Flow

Detailed accurate measurements of velocities, directions, and fluctuation intensities were performed with a newly developed laser velocimeter in the internal flow field of a radial discharge impeller, running at tip speeds up to 400 m/s. Relative flow distributions are presented in five measurement areas from inducer inlet to impeller discharge. The impeller flow pattern, which coincides largely with potential-theory calculations in the axial inducer, becomes more and more reversed when the flow separates from the blade suction side, developing a rapidly increasing wake in the radial impeller. The observed secondary flow pattern and effects of channel curvature and system rotation on turbulence structure are discussed with respect to separation onset and jet/wake interaction.

scholarly journals Multiphase performance and internal flow pattern of helico-axial pumps

2019 ◽  
Vol 240 ◽  
pp. 032029
Author(s):  
Y Xu ◽  
S L Cao ◽  
M Reclari ◽  
T Wakai ◽  
T Sano
Keyword(s):  
Flow Pattern ◽  
Internal Flow ◽  
Axial Pumps

DEPENDENCE OF SPRAYING PERFORMANCE ON THE INTERNAL FLOW PATTERN IN EFFERVESCENT ATOMIZERS

2001 ◽  
Vol 11 (6) ◽  
pp. 22 ◽  
Author(s):  
Sang Yong Lee ◽  
Joo Youn Kim
Keyword(s):  
Flow Pattern ◽  
Internal Flow
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