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LPG기관의 과류밸브가 가속성능에 미치는 영향에 관한 실험적 연구
장태익,김창헌,김철수,Jang Tae-Ik,Kim Chang-Hun,Kim Chul-Soo 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.7
This paper is to investigate on the effects of the hole size of spring type EFV(excessive flow valve) for automobiles The analytical and experimental methods were employed to measure the discharge coefficient. choked flowrate and Pressure wave in a bombe, line and vaporizor The size of EFV was determined to meet the legally permitted limits with the capacity of engine displacement up to 2000cc, according to the obtained discharge coefficient. The Purpose of this paper is 1) to find causes of bad acceration performance in LPG engines 2) to find optimal design determination of spring coefficient and orifice hole size of excessive flow valve in LPG engine 3) to find pressure wave of bombe, line and vaporizer through expeimental verification. Experimental results indicated that increase of orifice size 0.5mm to 1mm be caused to increase discharge coefficient, and choked flow rate and decrease operation range of difference pressure wave.
저속 디젤기관에서 흡기밸브 닫힘시기 지연시 고팽창 실현을 위한 열효율 특성
장태익,Jang Tae-Ik 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.1
In this research. the diesel cycle was thermodynamically interpreted to evaluate the possibility of high efficiency by converting diesel engines to the high expansion diesel cycle, and general cycle features were analyzed after comparing these two cycles. Based on these analyses. an experimental single cylinder a long stroke with high expansion-diesel engine. of which S/B ratio was more than 3, was manufactured. After evaluating the base engine through basic experiments, a diesel engine was converted into the high expansion diesel engine by establish VCR device and VVT system Accordingly, the high expansion diesel cycle can be implemented when the quantity of intake air is compensated by supercharge and the effective compression ratio is maintained at its initial level through the reduction of the clearance volume. In this case, heat efficiency increased by $5.0\%$ at the same expansion-compression ratio when the apparent compression ratio was 20 and the fuel cut off ratio was 2. As explained above, when the atkinson cycle was used for diesel cycle, heat efficiency was improved. In order to realize high expansion through retarding the intake value closing time, the engine needs to be equipped with variable valve timing equipment, variable compression ratio equipment and supercharged pressure equipment. Then a high expansion diesel cycle engine is realized.
장태익 ( Tae Ik Jang ),고재철 ( Jae Chul Koh ) 대구가톨릭대학교 자연과학연구소 2009 자연과학연구논문집 Vol.7 No.1
To investigate the effects of applying useful microorganisms on the control of Phytophthora capsici, research was done on the outbreak rate of Phytophthora capsici in accordance with the concentration of Phytophthora capsici Leonian in pot cultivation. As a result of drench with 103, 104 and 105 zoospor/㎖ of Phytophthora capsici Leonian in pot cultivation, the outbreak rate of Phytophthora capsici was 100% in the concentration of 105 for all three of H(Hanbando), M(Manidda) and S(Synhung). In the concentration of 104, though, the rate was 100% only for the cultivar of M while it was 50% for the S, which was a greatly decreased. In the concentration of 103, almost no outbreak happened to the cultivar of H, there are significantly difference according to concentrain of Phytophthora capsici for each cultivars. After drench was conducted in the concentration of 105 in which Phytophthora capsici Leonian clearly appeared to all three cultivars, microorganisms were used for drench three times in the concentration of 1.6g/ℓ and five times in the concentration of 3.3g/ℓ. Regarding the effects of applying useful microorganisms, the outbreak rate of Phytophthora capsici in the cultivar of H was 39.7% when it was drenched three times in the concentration of 1.6g/ℓ. The rate in the cultivar of M was 55.6% when it was drenched five times in the concentration of 3.3g/ℓ, and the rate in the S was 81% when it was drenched three times in the concentration of 1.6g/ℓ.