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축류형 송풍기의 성능 및 소음 예측을 위한 전산 프로그램의 개발 및 적용
정동규,홍순성,이찬,Chung, Dong-Gyu,Hong, Soon-Seong,Lee, Chan 한국유체기계학회 2000 한국유체기계학회 논문집 Vol.3 No.3
A computer program is developed for the prediction of the aerodynamic performance and the noise characteristics in the basic design step of axial flow fan. The flow field and the performance of fan are analyzed by using the streamline curvature computing scheme with total pressure loss and flow deviation models. Fan noise is assumed to be generated due to the pressure fluctuations induced by wake vortices of fan blades and to radiate via dipole distribution. The vortex-induced fluctuating pressure on blade surface is calculated by combining thin airfoil theory and the predicted flow field data. The predicted performances, sound pressure level and noise directivity patterns of fan by the present method are favorably compared with the test data of actual fan. Furthermore, the present method is shown to be very useful in optimizing design variables of fan with high efficiency and low noise level.
축류형 송풍기 설계 과정에서 공력 - 음향학적 성능 예측을 위한 전산 프로그램의 개발
정동규(Dong-Kyu Chung),홍순성(Soon-Seong Hong),이찬(Chan Lee) 한국유체기계학회 2000 유체기계 연구개발 발표회 논문집 Vol.- No.-
Developed is a computer program for the prediction of the aero-acoustic performance characteristics such as discharge pressure, efficiency, power and noise level in the basic design step of axial flow fan. The flow field and the aerodynamic performance of fan are analyzed by using the streamline curvature computing scheme with total pressure loss and flow deviation models. Fan noise is assumed to be generated due to the pressure fluctuations induced by wake vortices of fan blades and to radiate via dipole distribution. The vortex-induced fluctuating pressure on blade surface is calculated by combining thin airfoil theory and the predicted flow field data. The predicted aerodynamic performances, sound pressure level and noise directivity patterns of fan by the present computer program are favorably compared with the test data of actual fan. Furthermore, the present computer program is shown to be very useful in optimizing design variables of fan with high efficiency and low noise level and in analyzing their design sensitivities.
배추좀나방 방제약제로서 후추 추출물, 카시아 오일, 라벤더 오일 함유 친환경유기농자재에 대한 급성 생태독성평가
유아선(Are-Sun You),정미혜(Mihye Jeong),홍순성(Soon-Seong Hong),장희섭(Hee-Seop Chang),이제봉(Je Bong Lee),박경훈(Kyung-Hun Park),이영묵(Young Mook Lee),임양빈(Yangbin Ihm) 한국농약과학회 2013 농약과학회지 Vol.17 No.4
Environment-friendly agro-materials tend to be preferred to chemical insecticides recently. For this reason, many studies are conducted to develop environment-friendly insecticides containing natural materials. The purpose of this study was to assess ecotoxicity for pepper extract and cassia oil (11.5+46%, A), pepper extract and cassia oil (23+34%, B), and pepper extract and lavender oil (40+10%, C). They are expected to prevent from pests especially diamondback moth, and can be used for agro-materials. Their formulation was emusifiable concentration (EC). Target species used to assess acute toxicity were aquatic invertebrate (Daphina magna), fish (Cyprinus carpio), honeybee (Apis mellifera L.) and earthworm (Eisenia fetida). The EC<SUB>50</SUB> value of A, B, and C to aquatic invertebrate were 0.46, 1.9, 0.25 mg L<SUP>?1</SUP> respectively and these values were moderately toxic according to standard of USEPA. In case of acute toxicity test to fish, the LC<SUB>50</SUB> of A, B, and C were 1.9, 2.9, 3.8 mg L<SUP>?1</SUP> respectively. A was category II in acute toxicity of fish and not acceptable to evaluation criteria of environment-friendly agro-materials. B and C were category III and acceptable. Acute contact and oral toxicity test to honeybee were conducted and the LD<SUB>50</SUB> of A, B, and C were > 100 μg a.i. bee<SUP>?1</SUP> in both of tests. It indicated they were low toxic to honeybee. In case of acute toxicity test to earthworm, LC<SUB>50</SUB> of A, B, and C were 695, 988, and 564 mg kg<SUP>?1</SUP>. In conclusion, pepper extract+cassia oil 57% EC and pepper extract+lavender oil 50% EC were expected to be used for environment-friendly insecticide materials with low risk against ecosystem and contribute to developing environment-friendly agro-materials.
식물추출물 싸임화이트, 클로브버드, 계피, 라벤더, 레몬 유칼립투스 정유의 생태독성평가
유아선(Are-Sun You),최영웅(Young-Woong Choi),정미혜(Mi-Hye Jeong),홍순성(Soon-Seong Hong),박연기(Yeon-Ki Park),장희섭(Hui-Sub Jang),박재읍(Jae-Yup Park),박경훈(Kyung-Hun Park) 한국농약과학회 2011 농약과학회지 Vol.15 No.4
Environment-friendly agro-materials tend to be preferred to chemical insecticides recently. For this reason, many studies were conducted to develop environment-friendly insecticides containing natural materials. The purpose of this study was to assess ecotoxicity for 5 plant essential oils (Thyme white, Clove bud, Cassia, Lavender, Lemon eucalyptus) expected to prevent from pests and be used for agro-materials. Target species used to assess acute toxicity were aquatic invertebrate (Daphina magna), fish (Oryzias latipes), honeybee (Apis mellifera L.) and earthworm (Eisenia fetida). The EC50 value, toxicological responses of thyme white, clove bud, and cassia to Daphina magna were 2.5, 2.8, and 6.9 mg L<SUP>-1</SUP> respectively and these values were moderately toxic according to standard of USEPA. EC<SUB>50</SUB> of Lavender and lemon eucalyptus were >10 mg L<SUP>-1</SUP> then they were considered as slightly toxicity. In case of acute toxicity test to fish, LC<SUB>50</SUB> of thyme white and cassia were 6.7 and 7.5 mg L<SUP>-1</SUP> each other. The other plant essential oils indicated LC<SUB>50</SUB> >10 mg L<SUP>-1</SUP>. Acute contact and oral toxicity test to Honeybee were conducted. As a result, LD<SUB>50</SUB> of all essential oils were >100 ㎍ a.i. bee<SUP>-1</SUP> in both of tests. In case of acute toxicity test to earthworm, LC<SUB>50</SUB> of thyme white, clove bud, cassia, lavender, and lemon eucalyptus were 149,230, 743, 234, and 635 mg kg<SUP>-1</SUP>, respectively. In conclusion, if the safety for earthworm is confirmed, 5 plant essential oils are expected to be use for environment-friendly insecticide materials with low risk against ecosystem and contribute to developing environment-friendly agro-materials.