익렬간 혼합면 모델에 의한 토크컨버터의 특성해석

박재인(J.I.Park),조강래(K.R.Cho) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1

When a internal flow of turbomachine is analysed by numerical calculation method, the accuracy of calculated results will depend on the establishment of inlet and outlet boundary conditions, assuming that governing equations and differencing scheme are proper. So far the widely-used techniques of flow analysis for ordinary turbomachine have been adopted in the flow analysis of torque converter, i. e. the flow of each element of torque converter is analysed separately and in turn considering each one as a blade row of turbomachine. But the flow in torque converter is quite different from the flow in ordinary turbomachine in that the torque converter is closed-loop machine containing the same oil circulating through its elements, hence some difficulties appear in establishing boundary conditions. In this paper, in order to analyse the flow by more reasonable method the interrow mixing planes will be introduced between each element to fit in with the working principle of torque converter and the calculated performances of torque converter will be compared with the experimental results.

자동차용 토크 컨버터의 수치해석적 연구(Part Ⅲ) -기하학적 형상과 성능-

박재인(J. I. Park),조강래(K. R. Cho) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.1

In the hydraulic design of torque converters, there exist many geometrical parameters to be considered. Each parameter affects the performance of the torque converter. Unfortunately, the effects of the parameters on variations of the performance have been rarely known. In this paper, serveral geometrical parameters including the meridionaJ configuration of pump and turbine, the edge configuration at pump inlet, the distribution of angular momentum change, the offset angle of turbine, and the treatment for the trailing edge of stator were analyzed by numerical calculations. It was found that the geometrical variations are strongly related with the performances and the internal flowfield of torque converters.<br/>

토크 컨버터의 날개각과 성능에 관한 수치해석적 연구

박재인(J.I.Park),조강래(K.R.Cho) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2

The situation frequently occurs in which the input torque capaciy of the torque converter should be changed. It is known that the modification of the outlet blade angles of the torque converter elements is suitable for such situation with the outer diameter of flow path of the converter maintained. But so far it has been difficult to predict correctly the converter characteristics as well as the effects of oulet angles on torque capacity in the past numerical methods. In the present numerical method introducing the interrow mixing planes, the torque capacity was satifactorily estimated and it was shown that the torque capacity could be effectively changed by modifying the oulet blade angles of pump and stator.

자동차용 토크 컨버터의 수치해석적 연구 ( Part Ⅱ ) - 날개각과 성능 -

박재인(J. I. Park),조강래(K. R. Cho) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.6

The situation frequently occurs in which the input torque capacity of the torque converter should be changed. It is known that the modification of the outlet blade angles of the torque<br/> , converter elements is suitable for such situation with the outer diameter of flow path of the converter maintained. But so far it has been difficult to predict correctly the converter characteristics as well as the effect of outlet angles on torque capacity in the past numerical methods. In the present numerical method introducing the interrow mixing planes, the torque capacity was satisfactorily estimated and it was shown that the torque capacity could be effectively changed by modifying the outlet blade angles of pump and stator.<br/>

토크 컨버터의 기하학적 형상에 따른 성능변화

박재인(J.I.Park),조강래(K.R.Cho) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2

In the hydraulic design of torque converters, there exist many geometrical paramerters to be considered. Each paramerter affects the performance of the torque converter. Unfortunately, the effects of the paramerters on variations of the perfornlance have been rarely known. In this paper, several geometrical paramerters including the meridional configuration of pump and turbine, the edge configuration at pump inlet, the ditribution of angular momentum change, the offset angle of turbine, and the treatment for the trailing edge of stator were analyzed by numerical calculations. It was found that the geometrical variations are strongly related with the performaces and the internal flow field of torque converters.

자동차용 토크 컨버터의 수치해석적 연구(PartI) - 수력학적 설계와 순환유량의 평가 -

김흥식(H. S. Kim),박재인(J. I. Park),주원구(W. G. Ju),조강래(K. R. Cho) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.5

In order to establish the hydraulic design process of the torque converter, pump, turbine and stator were designed by reverse design method including one dimensional analysis, an-gular momentum distribution and forced vortex design. And the significance of evaluation of the circulating flow rate in torus of the torque converter was verified by numerical calcu-lation of the combined blade rows of pump and turbine. It was confirmed that the computa-tional method using interrow mixing model by Park and Cho was reliable to predict the flow-field and performance of the torque converter.<br/>

퇴비화 시설용 천연 악취저감제로의 잣송이 부산물의 활용 가능성에 관한 연구

천현식,곽정훈,가천흥,박재인,김창혁,라창식,Chun, H.S.,Kwag, J.YH.,Ga, C.H.,Park, J.I.,Kim, C.H.,Ra, C.S. 한국축산환경학회 2007 축산시설환경학회지 Vol.13 No.2

본 연구에서는 잣송이 부산물을 이용하여 인체와 가축에는 무해한 천연 잣송이 부산물 악취저감제를 제조하고 돈분뇨 퇴비화과정에 적용하여 악취 저감효과와 퇴비화에 미치는 영향을 분석하였다. 잣송이 부산물 악취저감제는 분쇄된 잣송이 부산물, 3종의 미생물(Lactobacillus spp., Alcaligenes spp., Pasteurella spp.) 그리고 무기영양소가 첨가된 당밀수를 혼합하여 수분함량을 55%로 조정한 후 $30^{\circ}C$에서 48시간 배양하여 제조하였다. 실험 처리구는 대조구인 톱밥처리구(T1),톱밥과 3종의 미생물을 혼합한 처리구(T2), 톱밥과 제조된 악취저감제(NDA) 처리구(T3)로 하여 실험실 규모의 반응기 내에서 퇴비화를 진행하면서 실험한 결과 퇴비화 기간 동안 모든 실험구는 최고온도 $55^{\circ}C$ 이상까지 상승하며 병원성 유해미생물들이 사멸되는 퇴비화 적정온도 조건에 부합하였다. 또한 퇴비화 전, 후의 이화학적 성상 변화를 분석한 결과 처리구간 큰 차이가 발견되지 않았으나 제조된 악취저감제를 20%이상 사용시 유기물 분해율이 적어져 퇴비화 과정에서 충분한 온도 상승이 이루어지지 않을 우려가 있을 것으로 판단되었다. 또한 악취저감제 사용 시 퇴비화 과정 중 암모니아 가스 발생에 따른 질소소실이 상대적으로 적어 최종 퇴비물질의 질소함량이 상대적으로 높아짐을 알 수 있었다. 퇴비화 기간 중 암모니아($NH_3$)가스 발생양상을 분석한 결과 황화수소($H_2S$)와 머캅탄($CH_3SH$) 등의 황화합물 가스와는 달리 퇴비화 전 과정을 거쳐 지속적으로 발생함을 알 수 있었다. 퇴비화 반응조에서 발생한 암모니아 가스 농도를 비교할 때 31일 동안 포집된 암모니아의 농도는 T1, T2, T3 각각 12,660 mg/L, 11,598 mg/L, 7,367 mg/L로 잣송이 부산물을 이용하여 제조된 악취저감제를 첨가한 T3에서 암모니아가스의 발생이 확실하게 저감됨을 알 수 있었다. 퇴비화 과정 중 발생하는 머캅탄($CH_3SH$)과 황화수소($H_25$)의 일일발생량과 축적량을 측정한 시험에서 제조된 악취저감제를 첨가한 T3에서는 황화수소 가스와 머캅탄 가스가 크게 감소함을 알 수 있었다. 이러한 결과로 미뤄 잣송이 부산물과 미생물을 혼합하여 제조된 악취저감제의 적량 이용은 퇴비화 과정과 퇴비 품질에 영향을 미치지 않으며 퇴비화 과정 중 발생하는 악취물질을 저감시킬 수 있음을 알 수 있었다. A natural deodorizing agent (NDA) was made using pine cone byproduct, and its effects on malodor emission and composting were analyzed in this study. NDA was manufactured by mixing pine cone byproduct with three species of microorganisms and water containing mineral nutrients and molasses, and then by incubating for 48 hours at $30^{\circ}C$. Lab scale experiments were done with three treatment groups, T1 (control, sawdust treatment), T2 (microorganisms and sawdust treatment group), and T3 (NDA and sawdust treatment group). During composting, temperatures reached over $55^{\circ}C$, a minimum temperature for the inactivation of pathogenic microorganisms. No differences were found in physicochemical composition of compost among treatments. However, it was observed that over usage of NDA could obstruct temperature increase, since the biodegradation rate of organic matter of NDA was relatively low, Nitrogen loss due to ammonia gas emission, which normally happens during composting, was reduced by using NDA, and hence the nitrogen level of final compost was higher in T3 than in others. During experiment, it was found that ammonia gas emission was entirely lasted through compositing duration, but the $CH_3SH$ and $H_2S$ gases were produced only at early stage of composting. The ammonia concentration trapped in $H_2SO_4$ solution during 31 days of composting in T1, T2 and T3 was 12,660mg/L, 11,598mg/L and 7,367mg/L, respectively, showing distinguishable reduction of ammonia gas emission in T3. The emissions of $CH_3SH$ and $H_2S$ gases were also remarkably reduced in T3. Based on these obtained results, usage of the deodorizing agent made with pine cone byproduct could reduce the emission of malodor during composting, without any deterioration of compost quality.

토크 컨버터의 설계와 성능해석

김홍식(H.S.Kim),박재인(J.I.Park),주원구(W.K.Joo),조강래(K.R.Cho) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1

The automotive torque converter consists of pump, turbine and stator. Its detailed design procedure is not yet known and remains know-how of the torque converter manufacturers. One-dimensional analysis is a strong solver in elementary design, but weak in presumption of performances and cannot validate 2 or 3-dimensional design parameters. In this paper, design process and parameters of 3-dimensional blade profile are discussed. And 3-dimensional turbulent flow analysis was performed for the designed torque converter. It was shown that the design of torque converter would be performed effectively by using the design method along with the flow analysis method described here.<br/>

축류압축기 내부의 비정상 유동의 수치해석

김봉균(B. K. Kim),주원구(W. G. Joo),박재인(J. I. Park),조강래(K. R. Cho) 대한설비공학회 1998 대한설비공학회 학술발표대회논문집 Vol.1998 No.6-2

엔진 헤드/블록 열 피로 내구 해석을 위한 비정상 온도 해석 기술

이준석(S. Lee),문길민(K.M. Moon),하응지(E.J. Ha),방인완(I.H. Bang),송경(S. Keung),박재인(J.I. Park) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Thermal fatigue, which leads to cracks and possible failure in high loaded engine, is a new challenge in modem engine development. Thus, an accurate thermomechanical fatigue analysis is a key to a successful life prediction of an engine assembly. However, due to many constraints, especially cost effectiveness and develop time reduction, simulation techniques are needed to substitute for thermal fatigue tests. ALCF(Low Cycle Fatigue) analysis is the most qualified simulation method to accurately predict the thermal fatigue. A transient heat transfer method has been developed to give boundary conditions to LCF analysis and also a LCF analysis is performed and validated with test results.