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PSP를 이용한 항공기 형상 모형 날개 표면 압력 측정
정혜진(Hye jin Jung),권기정(Kijung Kwon) 한국항공우주학회 2008 韓國航空宇宙學會誌 Vol.36 No.4
본 연구에서는 NACA4412익형으로 이루어진 주날개에 NACA0012플랩이 장착된 아음속 벽면효과 모형(SWIM)의 날개 표면 3차원 압력 분포를 압력감응페인트를 이용하여 시험적으로 연구하였다. 한국항공우주연구원의 아음속 풍동에서 레이놀즈수 3.1×10?의 조건에서 시험 모형의 받음각 변화에 따른 날개 윗면 및 아랫면의 압력 분포를 측정하였다. 그 결과 받음각이 증가함에 따라 날개 윗면에서의 최저 압력 지점이 뿌리에서 끝단으로 이동을 하는 것을 관찰하였고, 날개 끝단의 뒷전에서도 끝단 와류를 일으키는 압력이 매우 낮은 지점도 관찰되었다. 그러나 실속각 이후인 받음각 15도의 경우 끝단 뒷전에서는 압력이 낮은 지점이 계속 관찰되었으나 그 이외의 부분은 스팬 방향 압력 분포가 편평하였다. 압력감응페인트와 더불어 압력공을 사용하여 날개의 코드 방향 2차원 압력분포도 측정 하여 비교하였고 두 시험에서 측정된 각 압력계수들의 차이의 평균은 약 0.077임을 확인하였다. In this study, three dimensional surface pressure distributions of SWIM whose main wing has NACA4412 airfoil with NACA0012 flaps were experimentally measured by pressure sensitive paint. Surface pressures on suction and pressure sides of the wing were measured by changing an angle of attack at a Reynolds number of 3.1×10? in KARI 1m subsonic wind tunnel. The experimental results showed that as an angle of attack increases minimum pressure region on a suction side moved from the wing root to the tip and low pressure region around trailing edge of the wing tip which causes wing tip vortex was observed. Although low pressure region at the tip still observed at an angle of attack 15 deg., other area on a suction side showed flat pressure distribution in a span-wise direction. It was also observed that the mean value of pressure coefficients was about 0.077 through a comparison between PSP and pressure taps at the same test conditions.
고속압력감응페인트를 이용한 로터 블레이드 표면 압력 측정
김기동(Kidong Kim),권기정(Kijung Kwon) 한국항공우주학회 2014 韓國航空宇宙學會誌 Vol.42 No.1
본 논문은 고속압력감응페인트기법(Fast-Responding PSP)을 소개하고, 이를 이용하여 정지비행상태에 있는 축소형 로터 블레이드의 표면(윗면) 압력을 측정해봄으로서 PSP를 이용한 로터 블레이드 표면 압력 측정의 정확성과 그에 따른 실험기법의 타당성을 검증하기 위하여 수행되었다. 실험을 위한 광원으로는 532 ㎚ 파장을 가지는 Pulsed laser를 사용하였고, PSP 측정 기법으로는 Lifetime 기법을 적용하였다. 또한, 모델 표면에 도포된 압력감응페인트는 반응성이 높은 Porous PSP가 사용되었다. 로터 블레이드는 NACA0012 익형을 가지고 있으며 길이 340 ㎜, 코드 40 ㎜의 직사각 형상 1종과 끝단의 후퇴각이 다른 4종의 형상을 사용하였다. 로터 블레이드의 콜렉티브 피치각 변화에 따른 표면 압력 분포를 측정하였으며 측정된 결과를 통해 콜렉티브 피치각이 증가할수록 윗면의 압력이 낮아 지는 것을 정성적으로 확인하였고, 정량적인 압력계수는 NASA의 실험 데이터와 비교하여 약 0.4 ~ 0.7 정도 높은 경향성을 보였다. The present study was conducted by using fast-responding PSP technique to measure the surface pressure on a small-scale rotor blade in hover. Also, the study was performed to verify the accuracy and investigate its possibility of PSP application for rotor blade pressure measurement. Pulsed laser which has 532 ㎚ wavelength was used as a light source. Lifetime measurement technique was applied. Also, the coated paint on a rotor blade was porous PSP which has faster response time than conventional PSP. The blades had NACA0012 airfoils. The length of rotor blade was 340 ㎜ and chord was 40 ㎜ with rectangular shape 1 set, and 4 sets had several tip sweepback angles. The measured results qualitatively showed that the upper surface pressure decreases with increasing the collective pitch angle. Quantitative pressure coefficients of PSP results were higher approximately 0.4 to 0.7 than the pressure tap data of the NASA experiment.
박상현(Park Sang-Hyun),김무상(Kim Moo Sang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The Pressure-Sensitive Paint (PSP) technique is a method to measure surface pressure experimentally and to visualize the flow field quantitatively on a model surface. The significant advantage of PSP is a much higher spatial resolution of pressure field than that given by the discrete data available from pressure taps. In this paper, the PSP technique was applied to measure the pressure distributions of vehicle surfaces. More care should be taken to apply PSP technique for a real vehicle than for a scale model. The pressure distributions of two different hood shapes were compared and the reason for the difference of lift forces was discussed.
박승덕(Seoung Duck Park),이기선(Ki Seon Lee),김학봉(Hark-Bong Kim),곽재수(Jae Su Kwak),김재환(Jae Hwan Kim) 한국추진공학회 2008 한국추진공학회지 Vol.12 No.5
The film cooling effectiveness on a flat plate measured by pressure sensitive paint technique. Six film cooling hole were fabricated on a flat plate with 30 degree angle with respect to the surface and three blowing ratios of 0.5, 1, and 2 were tested. Results showed that PSP technique successfully evaluated the distribution of film cooling effectiveness and showed similar results with references. The film cooling effectiveness near the film cooling holes was higher for lower blowing ratio case. As the blowing ratio was increased, the film cooling effectiveness near the film cooling hole decreased due to the lift off of the coolant. At far downstream, the film cooling effectiveness for higher blowing ratio was higher due to the coolant reattachment.
마이크로 유동에서 PtOEP/PS 박막을 이용한 용존 산소 농도장의 정량적 가시화
송대헌(Dae Hun Song),김현동(Hyun Dong Kim),김경천(Kyung Chun Kim) 한국가시화정보학회 2011 한국가시화정보학회지 Vol.9 No.1
It is highly needed to measure the dissolved oxygen (DO) concentration field in water for a variety of purposes such as biological, industrial, environmental monitoring and medical application. Application of PSP (Pressure Sensitive Paint) which is sensitive to oxygen concentration has been carried out to measure DO concentration field using PtOEP/PS film and intensity based method under the UV-LEDs illumination. A micro round water jet having 100% of DO was obliquely impinged on to a PtOEP/PS film coated plate placed in a 0% of DO water container. DO concentration fields on the impinging plate were quantitatively visualized with a 2.94 ㎛ of spatial resolution. Through pixel-by-pixel calibration, uncertainty of each pixel by different sensitivity, different dye concentration and non-uniformity of illumination was removed. It is demonstrated that the high DO concentration region was coincided with the impingement area. The DO concentration gradient due to DO diffusion was affected by Reynolds number.
PtOEP/PS 박막을 이용한 용존 산소 농도장의 정량적 가시화
송대헌(Dae hun Song),김현동(Hyun Dong Kim),김경천(Kyung Chun Kim) 한국가시화정보학회 2010 한국가시화정보학회 학술발표대회 논문집 Vol.2010 No.11
It is highly powerful to get the dissolved oxygen concentration field in water for a variety of purposes such as biological, industrial, environmental monitoring and medical application. Application of PSP (Pressure Sensitive Paint) which is sensitive to oxygen concentration has been carried out in PSP measurement to measure dissolved oxygen concentration field on sub-milli scale. Dissolved oxygen concentration field around oblique jet are obtained using PtOEP/PS film and intensity based method.
막냉각 홀의 형상에 따른 터빈 블레이드 끝벽에서의 막냉각 효율 측정
김석민(Seokmin Kim),이동은(Dong-Eun Lee),정희윤(Heeyoon Chung),강영석(Young Seok Kang),이동호(Dong-Ho Rhee) 한국추진공학회 2022 한국추진공학회 학술대회논문집 Vol.2022 No.5
현대의 가스터빈 엔진은 작동온도를 증가시켜 엔진의 효율을 높이기 위해 다양한 연구가 수행되어왔다. 이에 가스터빈 엔진에 적합한 냉각기술의 필요성이 나타났다. 막냉각 기술은 가스터빈에 적용되는 대표적인 냉각기술 중 하나로 본 연구에서는 터빈 블레이드 끝벽에 여러 형태의 막냉각 홀을 가공 후 막냉각 효율을 측정하였다. 막냉각 홀의 형상으로는 기본형상 막냉각 홀과 최적 확장형 홀, 그리고 단차구조를 가공한 홀에 대해 실험을 수행했으며, 막냉각 효율의 측정 방법으로는 압력감응페인트를 이용하였다. 실험 결과 기본형상에 비해 다른 막냉각 홀 형상들이 터빈 블레이드 끝벽에서 더욱 개선된 냉각 효율을 보여주었다. For enhancing the efficiency of the gas turbine engine by increasing the turbine inlet temperature, various researches have been conducted. Therefore, the need for cooling technology suitable for gas turbine engines appeared. One of the representative cooling technologies applied to gas turbine is film cooling. In this study, film cooling effectiveness was measured on the endwall of turbine blade with various types of film cooling holes. Experiments were conducted with baseline fan-shaped film cooling hole, optimal fan-shaped hole and baseline with staircase geometry. Cooling Effectiveness measurement was used by Pressure Sensitive Paint (PSP). As a result, improved film cooling holes show more increased cooling effectiveness compared to the baseline film cooling hole.
박상현(Sang-Hyun Park),성형진(Hyung Jin Sung) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
A new algorithm, CBIR (Correlation-Based Image Registration) was proposed to improve the resolution of image registration for PSP (Pressure-Sensitive Paint). The local displacement vectors were obtained by finding the displacement which maximizes the cross-correlation between two interrogation windows of 'wind-off' and 'wind-on' images. A recursive multigrid processing was employed to increase the non-linear spatial resolutions. The variations of image were precisely measured without identifying the control points.