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- 검색키워드
- 저자 : 金張權 (검색결과 1 건)
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盧秉俊,金張權 全北大學校 1984 論文集 Vol.26 No.-
Turbulent jet flow has been studied in many ways: a plane jet, a rectangular jet, an annular jet, a round jet, a wall jet, a parallel jet, a valve jet, a cross jet, a slit jet and etc. In this report, a 45˚ cross jet flow was tried with two same dimensioned nozzles(dia, ø20)which were set up at the exit of the subsonic wind tunnel. Each jet flows to the direction of 22.5˚ to the axis of downstream of the mixed turbulent flow. The centerline of each jet meets at the distance of 217.3mm and their mixing flow could be imagined to exist beyond that distance. For the experimental investigation, the measurement was effectuated at X/X_0=1.2~1.5. The section of the mixed flow shows a elliptic circle which is formed by the inertia forces of the 22.5˚ inclined flows to the X direction. This experimental study aimed at the investigation of the turbulent mixing process of two jets; the mean velocities, the turbulent shear stresses, the correlation coefficients, and the momentum flux were respectively measured in the three directions. The histograms of the turbulent velocities were plotted for the statistical analysis of turbulence. The mean velocity distribution profiles of the downstream component measured in the Y direction coincide well with the empirical equation of Go¨rtler and those measured in the Z direction agree with the equation of H. Schilchting. Other mean velocities ?? and ?? components were randomly distributed. The higher values with same order of the intensity of turbulence were largely distributed at the central part of the flow section. The momentum flux was decreased up to 70% by the shock losses and the development of intense turbulences, but it kept its value constantly beyond X/d=14. Two channel hot-wire anemometer systems(model 1050 series), a dynamic spectral analyzer(model SD 375), a computer (model HP 9845B), and a plotter(model HP 9872C) were used for the calculation and plotting. The X-type hot-wire made of tungsten(dia. ø5㎛, long 3mm, model 0252 T5) was used for the measurements of the mean and turbulent components and the pressures were measured by a electric micro manometer with the precision of 1㎛ of water column. The probe was moved to each direction by a automatic probe traversing system(model SD-100C) with the precision of 1/100mm.
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