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고청아(Cheongah Go),박영철(Youngchul Park),서태석(Taeseok Seo),문영택(Youngtaek Moon),김준형(Junhyung Kim) 한국추진공학회 2018 한국추진공학회 학술대회논문집 Vol.2018 No.12
세 가지 다른 온도(60℃, 70℃ 그리고 75℃)에서 약 1년 동안 복기추진제의 가속 노화 시험을 수행하였다. 노화 특성을 평가하기 위해 고성능 액체크로마토그래피와 AKTS사의 Thermokinetics 소프트웨어를 활용하여 추진제의 안정제 함량과 속도론적 분석을 수행하였다. 그 결과, 추진제의 안정제 함량은 노화 온도 및 노화 기간에 따라서 점차적으로 감소하였다. 75℃에서의 안정제 감소 속도는 70℃와 비교하여 약 2배 정도 빠른 것으로 나타났다. 이러한 실험값들을 속도론적 SB 모델과 2단계 모델로 모사하였고, n1=1, n2=0에서 실제데이터를 가장 잘 모사하였다. The accelerated aging test for the double base propellant has been carried out at three different temperatures (60℃, 70℃ and 75℃) for around one year. The stabilizer contents and thermal decomposition kinetics of double base propellant were analyzed using high performance liquid chromatography and AKTS’s Thermokinetics software in order to evaluate the aging characteristics. As a result, the stabilizer contents in double base propellant gradually decreased according to temperature and duration. The consumption rate of stabilizer in double base propellant showed 2 times faster at 75℃ compared to at 70℃. These experimental values were simulated by SB kinetic models, and it was shown that the two-step model with constant reaction orders n1=1 and n2=0 best describes the process of the stabilizer depletion for the double base propellant.
열중량분석법에 의한 Boron-Potassium Nitrate(BKNO₃)의 열분해 특성 연구
고청아(Cheongah Go),김준형(Junhyung Kim),박영철(Youngchul Park),문영택(Youngtaek Moon),서태석(Taeseok Seo),류병태(Byungtae Ryu) 한국추진공학회 2019 한국추진공학회지 Vol.23 No.2
The thermal decomposition characteristics of boron-potassium nitrate (BKNO₃) were investigated by non-isothermal thermal gravimetric analysis (TGA). Two steps of mass loss were observed in the temperature range between room temperature and 600 ℃. Kinetic parameters of the thermal decompositions were evaluated from the measured TGA curves using the AKTS Thermokinetics Software. For the first step of mass loss (220–360 ℃) corresponding to the thermal decomposition process of the binder (Laminac/Lupersol), the activation energy is in the range of approximately 120–270 kJ/mol when evaluated by Friedman’s iso-conversional method, while the value of activation energy varies in the range of approximately 150–400 kJ/mol during the second step process (360–550 ℃).
고청아(Cheongah Go),박영철(Youngchul Park),서태석(Taeseok Seo),문영택(Youngtaek Moon),김준형(Junhyung Kim) 한국추진공학회 2019 한국추진공학회지 Vol.23 No.4
Accelerated aging test for the double base propellant was carried out at three different temperatures (60, 70, and 75 ℃) for over a year. To evaluate the aging characteristics of the double base propellant, the stabilizer contents and thermal decomposition kinetics were analyzed by using high performance liquid chromatography (HPLC) and AKTS-Thermokinetics software. As a result, stabilizer contents in the double base propellant gradually decreased according to the aging temperature and aging duration. The consumption rate of 2-NDPA in the accelerated aged propellants showed that it was two times faster at 75 ℃ in compared with ther rate at 70 ℃. These experimental values were simulated by the SB kinetic model, and it was shown that the two-step model with constant reaction orders n1=1 and n2=0 best describes the process of the stabilizer depletion for the double base propellant.
탄성내열재 배합 환경에 따른 내열 성능 변화에 관한 연구
김남조(Namjo Kim),서상규(Sangkyu Seo),강윤구(Yoongoo Kang),고청아(Cheongah Go) 한국추진공학회 2019 한국추진공학회지 Vol.23 No.1
The thermal response of elastomeric insulators used as protection against high-temperature and high-pressure combustion gases varies depending on their composition and thermal environment conditions. In this paper, the thermal response characteristics of elastomeric insulators in different mixing environments were compared. Tests to determine thermal protection performance were carried out using a thermal protection rubber evaluation motor(TPREM), combustion gas velocities of 20 ㎧ and 100 ㎧ were tested at a chamber pressure of 1,000 psig. The pressure time curve of the chamber, the temperature time curve of the internal materials, the residual thickness and the thermal destruction depth of the test specimens were obtained. The results showed that the thermal protection performance of elastomeric insulators in different mixing environments was similar.
탄성내열재 배합 환경에 따른 내열 성능 변화에 관한 연구
김남조(Namjo Kim),서상규(Sangkyu Seo),강윤구(Yoongoo Kang),고청아(Cheongah Go) 한국추진공학회 2018 한국추진공학회 학술대회논문집 Vol.2018 No.5
고온 · 고압의 연소가스로부터 구조물을 보호하는 탄성내열재는 재료 조성 및 열환경 조건에 따라 열반응에 차이를 보인다. 본 논문에서는 탄성내열재의 배합 환경 변화에 따른 열반응 특성을 비교하였다. 탄성내열재의 내열 성능 시험은 내열고무성능평가장치(TPREM)를 이용하였으며, 연소실 압력 1,000 psig에서 연소가스속도를 각각 20 m/s과 100 m/s로 시험하였다. 연소실 압력-시간 선도, 재료 내부 온도-시간 선도, 탄성내열재 시편의 잔류두께 및 열파괴두께를 획득하였다. 배합 환경에 따른 탄성내열재의 내열 성능은 유사하였다. The elastomeric insulators that protect from high-temperature and high-pressure combustion gases differ in the thermal response depending on the composition of materials and thermal environment conditions. In this paper, thermal reaction characteristics of elastomeric insulators in different mixing environments was compared with each other. The tests for thermal protection performance were carried out using a thermal protection rubber evaluation motor(TPREM), combustion gas velocities were tested at 20 m/s and 100 m/s at the 1,000 psig in chamber pressure, respectively. The pressure-time curve of chamber, materials internal temperature-time curve, residual thickness and thermal destruction depth of test specimens were obtained. After the tests, results show that thermal protection performance of elastomeric insulators by mixing environments was similar.