Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2002.08a
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- Pages.385-388
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- 2002
On the Behavior of Liquid Droplets Depending upon ALR in Two-phase Internal Mixing Nozzle Jet
2상 내부 혼합형 노즐분사에서 ALR 변화에 따른 액적의 거동
Abstract
The researches of a two-phase atomizers have been carried out in the field of automotive and aerospace industries in order to improve the atomization performance of the liquid droplets ejecting from these nozzles. The smaller droplets have the advantages of the reduction of environmental pollution matter and effective use of energy through the improvement of heat and mass transfer efficiency. Thus, to propose the basic information of two-phase flow, an internal mixing atomizer was designed, its shape factor was 0.6 and the liquid feeding hole was positioned at the center of the mixing tube which was used to mix the air and liquid. The experimental work was performed in the field after the nozzle exit orifice. The measurement of the liquid droplets was made by PDPA system. This system can measure the velocity and size of the droplets simultaneously. The number of the droplets used in this calculation was set to 10,000. The flow patterns were regulated by ALR (Air to Liquid mass Ratio). ALR was varied from 0.1024 to 0.3238 depending on the mass flow rate of the air. The analysis of sampling data was mainly focused on the spray characteristics such as flow characteristics distributions, half-width of spray, RMS, and turbulent kinetic energy with ALR.
Keywords
- Atomisation;
- Shape Factor;
- Liquid Droplet;
- PDPA System;
- ALR;
- Half--Width of Spray;
- RMS(Root Mean Square)
- 미립화;
- 형상계수;
- 액적;
- 위상도플러 입자 분석기;
- 공기-액체 질량유동율;
- 분무반폭;