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EFFECT OF ALR ON THE ATOMIZATION CHARACTERISTICS OF A PRE-FILMING AIRBLAST ATOMIZER
Mir Muhammad Tareq,Reza Alidoost Dafsari,Seungchae Jung,Jeekeun Lee 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Various atomizing devices have been developed for application to gas turbine combustors in order to improve combustion stability and to meet enforced environmental regulations. In this study, atomization characteristics of a prefilming airblast nozzle were experimentally evaluated with ALR (ratio of air to liquid), air pressure difference (ΔP (%)) and liquid properties. The initial sheet thickness formed on a pre-filmer of the nozzle was 550 ㎛, and swirling air flow generated from two swirlers having opposite rotational directions acts inside and outside the liquid sheet. Experiment was carried out at room temperature (20℃) and ambient pressure and Jet A-1 aviation fuel was used as the working fluids. PDPA system was applied to measure drop size and velocity simultaneously. CCD Imaging was used for investigating secondary atomization characteristics of the spray. Spray characteristics such as spray cone angle, mean droplet size, flow behavior for both fluids were measured and compared with ALR and air pressure difference ΔP (%).
가스터빈 내의 NOx 예측을 위한 화학반응기 네트워크 모델 개발
김승한(Seunghan Kim),누엔 후 트럭(Nguyen Huu Truc),박정규(Jungkyu Park),정승채(Seungchae Jung),양시원(Siwon Yang) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In order to predict NOx and CO emission of lean premixed gas turbine, the chemical reactor network(CRN) is developed based on the computational fluid dynamics(CFD). The CRN consists of 16 chemical reactor elements which stand for different reaction zones of the combustor. The predictions of exhaust gas in this study were carried out by using CHEMKIN code and full GRI 3.0 chemical kinetic mechanism. The comparison of CRN prediction results and experimental results shows a reasonable agreement.