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건식 가스 스월버너의 슬릿부와 스월베인부가 주 유동장에 미치는 영향
부성보 群山大學校 産業大學院 2003 국내석사
This paper is studied to investigate the effects of slits and swirl vanes on the main flow fields of gun-type gas swirl burner. Also, this study analysed the vector fields and three dimensional mean velocities, the turbulent intensities, the turbulent kinetic energy etc. These were obtained by using an X-type hot-wire probe from the hot-wire anemometer system in the X-Y plane and in the Y-Z plane of gun-type gas swirl burner. This experiment was carried out at flowrate 450 ℓ/min, which is equivalent to the actual combustion air flowrate necessary for heat release 15,000 kcal/hr in gas furnace, in the test section of subsonic wind tunnel. The results obtained through the comparison among three kinds of burner models are as follows; 1) The axial mean velocity component shows that the fast jets by slits surround the rotational flow by swirl vanes which spread radially. The inertia of the rotational flow largely works in the central region of a burner by air-curtain effect due to the fast jets and the rotational flow goes partly through the narrow border region between slit and slit. 2) Therefore the more spreaded flow width due to strong velocity can be shown within about Y/R = ±1.5 radially in the initial region of about X/R = 1.5. Especially, because the fast jets play the role that the rotational flow cannot turn toward radial direction any more in the central region of a burner, and they drive the main flow including rotational flow to axial direction, the rotational flow by swirl vanes works much stronger relatively in the central region of a burner. Also, the axial mean velocity component is largely distributed in the central part of a burner. 3) The axial component of turbulent intensity and the turbulent kinetic energy in gun-type gas burner have the large values within about X/R = 1.5 stressing on the outer edge of swirl vanes and the near slits because inertia of the rotational flow strongly induces in these places as a result of that the fast jet of slits surrounds the rotational flow. As the axial distance increases, they have the large and even magnitude relatively in the central part of a burner because the fast jet flow formed near the silts decreases greatly and it drives the rotational flow to the center. 4) Slits cause the fast jets, and then they have the characteristics that the flow is not adequately spread to radial direction and has long flow length as well as very small flow velocity in the central part. On the contrary, swirl vanes does not have long enough for adequate flow length to downstream because the rotational flow diffuses remarkably to radial direction. 5) The suitable arrangement between slits and swirl vanes causes effective flow width and flow length, and then it promotes fast flow mixing over the entire region including central part to increase turbulence more largely and effectively. Therefore, it is thought as a very desirable design method in gun-type gas burner to locate slits on the outside of swirl vanes.
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