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마이크로 가스터빈용 연소기 설계를 위한 GUI 프로그램 개발
주해지(Hae-ji Ju),조주형(Ju Hyeong Cho),황정재(Jeongjae Hwang),김민국(Min Kuk Kim),김한석(Han Seok Kim) 대한기계학회 2018 大韓機械學會論文集B Vol.42 No.12
마이크로 가스터빈 연소기의 설계 과정은 배기 배출물질, 압력손실과 같은 연소기의 성능 및 전체 형상 치수와 관련된 다양한 제한조건을 고려해야 하는 복잡하고 반복적인 절차이다. 본 연구에서는 마이크로 가스터빈 연소기의 기본 설계 절차를 체계적으로 정립하고 설계 효율성을 향상시키기 위해 설계프로그램을 개발하였다. 프로그램은 사용자 편의성을 위해 GUI환경으로 개발되었으며 연소기의 환형 케이싱, 라이너, 스월 버너 등 주요 설계 치수가 도출된다. 또한, 설계 치수에 해당하는 연소기의 형상이 2-D modeling으로 구현되도록 하였다. 버너의 성능과 압력손실에 영향을 미치는 선회기의 설계 시 기존 형상을 포함한 다양한 형상을 고려하였으며 일반적으로 알려져 있지 않은 선회기 계수는 설계 정확성을 위해 실험을 통해 도출하였다. 도출된 선회기 계수는 기존 형상의 선회기 계수와 유사하였다. Designing a gas turbine combustor is a complex, iterative process, taking into account various restrictions related to the overall sizing and performance, including emissions and pressure losses. This paper describes a combustor design program that integrates the preliminary design processes in an organized manner to improve the design efficiency of a gas turbine combustor. The program was implemented in MATLAB software, realizing a userfriendly graphical user interface (GUI) to estimate the dimensions of the main components such as the annular casing and liner, and the swirl-stabilized burners. In addition, 2-D modeling in the program is capable of automatically visualizing the configuration of a designed combustor. With regard to the design of a swirler, which considerably affects the performance characteristics of the burner, such as overall pressure loss, various types of swirlers are incorporated into the program. The unknown swirler coefficient, which was determined by measuring the pressure loss, was observed to be similar to the swirler coefficient of conventional types.
마이크로 가스터빈용 스월-예혼합 버너의 선회 유동 특성 분석
주해지(Hae-ji Ju),조주형(Ju Hyeong Cho),황정재(Jeongjae Hwang),김민국(Min Kuk Kim),김한석(Han Seok Kim),이원준(Won June Lee) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Swirl-premixed burners have been gaining considerable interest in low-emission gas turbines. The well-premixed combustion of fuel and air reduces thermal NOx emissions by inhibiting the local high temperature spots. If the fuel and air are poorly mixed, however, the benefit of premixed combustion may diminish. The recirculation zone generated by a swirler acts as an aerodynamic flame holder for flame stability. In this study, we investigated the characteristics of a swirl-premixed burner to identify how the swirl intensity affects the fuel/air mixing, recirculation flow field, flame shapes, and NOx emissions. The numerical results show that the swirl intensity influences the radial pressure gradient in the burner and, subsequently, the fuel penetration depth, leading to a change in the unmixedness, which quantifies degree of fuel/air mixing. A comparison of the unmixedness with the measured NOx emissions shows that NOx production was decreased by enhanced mixing. The strongly swirled flow augmented the recirculation flow rate, which moved the flame base toward the more upstream side and changed the flame shape from ‘V’ to ‘M’.
스월-예혼합 버너의 출구 형상 변화에 따른 연소 특성 분석
주해지(Hae-ji Ju),조주형(Ju Hyeong Cho),황정재(Jeongjae Hwang),김민국(Min Kuk Kim),김한석(Han Seok Kim),이원준(Won June Lee) 한국연소학회 2020 한국연소학회지 Vol.25 No.4
This study investigated the effect of the outer recirculation zone(ORZ) on the combustion characteristics and NOX emissions. Numerical simulation and experimental test were conducted for the combustors with two types of the burner outlet. The ORZ is formed conspicuously for a flat type with sudden expansion outlet while it is formed in a negligible size for a curved type with gradual expansion outlet. In a higher adiabatic flame temperature(AFT) condition of 2020 K, the NOX emission of the flat type is increased by 19% compared with the curved type as the ORZ has long residence time and high temperature enough to produce the thermal NOX. On the other hand, the NOX emission of the flat type is decreased slightly in a lower AFT of 1850 K as the temperature of the ORZ is not high enough to significantly produce the thermal NOX. The tendency of the calculated NOX emission is consistent with the experiment results.