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論文
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世取山, 幸作 ; 天野, 俊輔 ; 藤原, 秀智 ; 古畑, 朋彦 ; 新井, 雅隆
概要:
application/pdf<br />Journal Article<br />A new low NO_x combustor for kerosene fueled micro gasturbine was proposed, and the combustion characteristics of prototype combustor were investigated. In order to enhance the recirculation in
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a primary combustion zone, a swirler was set between the primary and secondary combustion zones. Combustion air was introduced through the swirler and forced to flow upward to the combustor bottom, from where the fuel spray was supplied through a nozzle. To achieve high combustion stability and low emission in wide fuel air ratio, the optimum configuration of the primary combustion zone were investigated. The optimum one was found out by measuring the fundamental combustion characteristics such as lean combustion limit, flame luminosity, exhaust gas composition and combustion gas temperature.
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天野, 俊輔 ; 新井, 雅隆
概要:
application/pdf<br />Journal Article<br />A new concept of combustion liquid fuel suitable for Gas Turbine combustor was
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investigated. Combustion in high temperature and low oxgen concentration by Burnt Gas Recirculation (BGR/FGR/EGR) is an important technology for low NO_χ combustion of liquid fuel. Upward swirl was focused to produce forced recirculation flow of burnt gas. A combined method of analytical approach (Computational Fluid Dynamics: CFD) and experimental approach was used. Flow pattern produced by the upward swirl introduced into combustion zone from the direction of combustion zone exit was investigated. CFD showed that a kind of guide vanes to produce flow to inside of radial direction at the top of combustion zone had important role for the upward swirl to recirculate fully to the top of combustion zone. A prototype combustor with the design based on results of CFD with and without combustion was made and tested. Non-luminous flame was observed at lean combustion condition. These results showed that this new concept of the primary zone had a high potential as a low NO_χ combustion technology of liquid fuel.
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新井, 雅隆 ; 天野, 俊輔 ; 藤原, 秀智
概要:
application/pdf<br />Journal Article<br />The combustion characteristics of a prototype micro-gasturbine combustor fueled by kerosene were investigated. In order to enhance the recirculation in a primary combustion zone, a swirler was
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set between the primary and secondary combustion zones. Primary combustion air was introduced through the swirler and forced to flow upward to the combustor bottom, from where the fuel spray was supplied through a nozzle. The fundamental combustion characteristics such as lean combustion limit, flame luminosity etc. showed that this prototype combustor had a high potential for lean combustion and wide flame holding. Since a strong forced recirculation flow was induced by the upward swirl, lean and non-luminous flame was maintained in the primary combustion zone. Further, burned gas recirculation and highly turbulent shear flow in the primary combustion zone, both of which were caused by the upward swirl, resulted the low NO_x emission characteristics.
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小保方, 富夫 ; 橋本, 徹 ; 五十木, 慎一 ; 柄沢, 隆夫 ; 志賀, 聖一 ; 倉林, 俊雄
概要:
application/pdf<br />Journal Article<br />The swirl and axial components of gas velocity in the disk-type combustion cha
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mber of a firing engine were measured by an LDA. The engine was operated under the conditions of a speed of 1500rpm, η_υ=0.5, φ=1.4 and ignition timing of 30°BTDC. The gas velocities at 9 points on a diameter at midheight of the combustion chamber were analyzed by the cycle-resolved method. The bulk (mean) velocity was determined by the frequency discrimination method with the cut-off frequency of 667Hz. The flame propagation pattern was detected by ionization probes set at 17 points on the piston. It has been observed that, in the case of fired operation, the turbulence intensity is higher, the integral length and micro length scales are longer and the swirl flow is weaker and is eccentrically shifted compared with the case of motored operation. These results show that it should be noted that there are remarkable differences in the gas flow between motored operation and fired opeation.
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鈴木, 富雄 ; 中山, 満茂
概要:
application/pdf<br />Journal Article<br />各種燃料の燃焼形態は大別して輝炎, 不輝炎である. 単一燃焼器でこれら火炎が任意に得られる旋回流形式による噴霧燃焼器の試作を示す. 燃焼に関与する諸条件(燃
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料量, 噴霧特性, 空気量など)を同一としたままで, 旋回流の流れ場と噴霧主流との相対位置を選択することによって燃焼を制御, それぞれの燃焼形態での燃焼特性を明らかにした. これらデータは噴霧燃焼のモデリング, あるいは数値計算による予測に利用が期待される.
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