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박영도(Y. D. Park),유상희(S. H. Yoo) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
In these days, wear resistance is an essential condition because the relative movement between machine parts is being accelerated and those connected with the drive parts transmit power and force. Also wear resistance is closely related to reliability and life of products, therefore the study on friction and wear is very important in many fields. In this paper, wear test was conducted to know properties about friction and wear of manganese phosphate being used widely. Test type is 1 ball on disk and we compared manganese phosphate thin film with non-coated material. Through this study, we could know the effect of this surface treatment method, and then it is assumed that the reliability of parts will be secure.
조건 평균법에 의한 난류 예혼합 화염편 구조와 전파 속도 예측
박영도(Yeongdo Park),허강열(Kang Y. Huh) 한국연소학회 2021 한국연소학회지 Vol.26 No.4
A governing equation is derived from the equation of the reaction progress variable for the conditional flamelet structure and the turbulent burning velocity in turbulent premixed combustion. Direct numerical simulations are conducted for constant density flames to validate the newly derived conditional flamelet equation. Good agreement is shown between the conditional flamelet equation and the flamelet structures and turbulent burning velocities from DNS. They are validated for laboratory flames as well by numerical solutions of the modified laminar premixed flame code in Cantera. Reasonable agreement is shown with a tuning constant for turbulent diffusivity to consider the uncertainty involved in each experimental setup and conditions in the references.