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터어보 기계(機械) 내부(內部)의 비가역(非可逆) H-S유동(流動)을 고려(考慮)한 준(準)3차원(次元) 유동해석(流動解析)
조강래,오종식,Cho, Kang-Rae,Oh, Jong-Sik 대한설비공학회 1991 설비공학 논문집 Vol.3 No.4
A quasi-three dimensional calculation method is presented on the basis of Wu's idea using finite element methods. In B-B flow the governing equations are cast into a single equation to overcome the restriction of the type of turbomachinery, and Kutta condition is exactly assured by introducing a combination of two kinds of stream functions. In H-S flow a dissipative force which is assumed to be opposed to the relative velocity is added to the governing equation for a consistent loss model. The entropy change along each streamline is then calculated by assuming that the dissipative force may be a force coming from laminar viscous stresses with inviscid velocity distributions. Both the flow solvers are combined to build a three-dimensional flow field through a few iterations. For an effect of the distortion of H-S flow surface the body forces are computed after each B-B flow calculation is finished. Mizuki's centrifugal impellers are tested numerically. The reliability of the numerical solution compared with experimental data is guaranteed.
[論文] 都心走行에 있어서 가솔린自動車의 燃料消費 및 汚染物質 排出特性에 關한 硏究
조강래(Kang Rae Cho) 한국자동차공학회 1984 오토저널 Vol.6 No.4
The relationship between vehicle driving pattern and fuel consumption in urban area was stu-died in Seoul along three representative routes using a test car equipped with all the instr-ments required for recording modes of traffic and measuring fuel consumption.<br/> Correlation with idle speed, fuel consumption and CO concentration of car in use was also measured.<br/> The average vehicle speed in Seoul was 31.4km/h and the time spent in different modes was 23.0% in idle mode, 22.5% in acceleration mode, 32.4% in cruising mode and 22.3% in dece-leration mode, respectively. Hence, traffic flow was suggested to bc relatively smooth.<br/> Fuel consumption per unit distance, φ, was closely related with trip time spent per unit dis-tance, t, and correlation coefficient obtained from the test car was 0.925, and the relationship between φ and t was also obtained from the linear regression with the following equation. φ=42.87+0.38t.<br/> Idle speed of vehicle. in use was mostly adjusted low and cars which were over the pcrmi-ssible standard of CO concentration (4.5%) were 50% or more.<br/> As the idle speed decreased, the fuel consumption was decreased, while the CO concentration was increased. Therefore, the decrease of fuel consumption can not be expected with only a decrease in idle speed.<br/>