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초록· 키워드

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Twin-fluid nozzle being its high performance and simple structure has been widely used in combustors, such as spark ignition engine, gas turbine, rocket engine and industrial furnace. The spray characteristics - the drop size, the drop velocity, the number density and the mass flux, become increasingly important in the design of the combustor and in testifying numerical simulation of spray flow in the combustor.
The purposes of this study are to clarify the spray characteristics of twin-fluid nozzle and to offer the data for combustor design and the numerical simulation of a spray flow.
Water and air were used as the working fluids in this experiment. The mass flow rates of water were varied from 0.03 to 0.06 ㎏/min, and the air flow rates were controlled to have the air/liquid mass ratio(ALR) from 1 to 6.
Spatial drop diameters were measured by an immersion sampling method. The mean diameter, size distribution and uniformity of drop were analyzed with variations of air velocity.
The results show that the SMD increases with the liquid supply flow rate and decreases with the air supply velocity, and the larger drops can diffuse farther to the boundary of spray. The drop size range is found to be wider close to the spray boundary where the maximum SMD locates.

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Abstract

1. Introduction

2. Rosin - Rammler distribution function

3. Experimental apparatus and measurement methods

4. Test conditions

5. Results and discussion

6. Conclusions

References

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UCI(KEPA) : I410-ECN-0101-2009-553-015458218