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노즐 형상에 따른 Jet in Crossflow의 분무 특성
윤현진(Hyun Jin Yoon),임영헌(Young Heon Lim),홍정구(Jung Goo Hong),이충원(Choong Won Lee) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11
Crossflow에 미치는 영향을 최소화하면서 liquid Jet의 미립화 및 혼합특성을 향상시키기 위한 JICF의 분무 특성에 대해 실험적으로 연구하였다. Crossflow의 온도, 속도, 압력과 liquid Jet의 속도, 압력을 변화시키면서 crossflow와 liquid jet의 momentum ratio(q)의 변화에 따른 spray boundary(outer boundary, inner boundary)를 측정하고 실험식을 유도하여 선행연구자의 결과와 비교하였다. 특히, injector의 형상에 따른 jet penetration를 측정하여 dual orifice injector의 경우 전단 오리피스의 영향으로 후단 오리피스에서의 jet penetration은 single orifice injector 분사노즐과 비교할 때 약 18% (Lh=4 mm) 증가하는 것을 확인하였다. The spray characteristics of jet in crossflow (JICF) to improve the atomization and mixing characteristics of liquid Jet, while minimizing the impact on crossflow, were studied experimentally. By varying the temperature, velocity, pressure of crossflow and the speed, pressure of liquid Jet, the spray boundary (outer boundary, inner boundary) with the change of crossflow and liquid jet momentum ratio (q) were measured and led the experimental formula, compared with the results of previous work. Specifically, when the jet penetration with the shape of injector were measured, in the case of dual orifice Injector, under the influence of front orifice, the jet penetration of back orifice was improved approximately 18% (Lh = 4 mm), compared with single orifice injector.
임베디드 서모커플 센서 제조 및 미끄럼 마찰 계면온도 측정에 관한 실험적 연구
장범택(Beomtaek Jang),임영헌(Youngheon Lim),김석삼(Seocksam Kim) 한국트라이볼로지학회 2013 한국윤활학회지(윤활학회지) Vol.29 No.6
This study investigated the interface temperatures for the sliding friction of three types of pins fabricated with thermocouple wires by the suction casting method. Optical microscopy was used to examine the surrounding material state at the bonding interface with the thermocouple wires. Friction tests were performed under dry sliding conditions against stainless steel 304 at nominal stresses of 1.42-4.25 MPa and sliding speeds of 0.5-1.25 m/s. Tribological data were collected using a custom-made pin-on-disk apparatus that measured he interface temperature and corresponding friction coefficient. Static tests were performed to demonstrate the functionality and reliability of the thermocouple wires-combined temperature sensor (TCTS). Each TCTS showed good linearity and sensitivity and very similar response times for the thermocouple and critical temperature during sliding friction.