Feasibility of Pulse Combustion in Micro Gas Turbines

查看全文 作　　者：Juha [1]Honkatukia;Esa [1]Saari;Timo [2]Knuuttila;Jaakko [1]Larjola;Jari [1]Backman

机构地区：[1]Lappeenranta University of Technology,P.O. Box 20,53851 Lappeenranta, Finland;[2]T-Turbine Oy, Rakentajainkuja 4 B,02330 Espoo, Finland

出　　处：《Journal of Thermal Science》索引2012年第21卷第5期,共8页

基　　金：the Finnish Funding Agency for Technology and Innovation(Tekes),T-Turbine Oy,AXCO-Motors Oy and Veneveist m Pauniaho Oy for supporting this work 摘　　要：In gas turbines, a fast decrease of efficiency appears when the output decreases; the efficiency of a large gas turbine (20…30 MW) is in the order of 40 %, the efficiency of a 30 kW gas turbine with a recuperator is in the order of 25 %, but the efficiency of a very small gas turbine (2…6 kW) in the order of 4…6 % (or 8…12 % with an optimal recuperator). This is mainly a result of the efficiency decrease in kinetic compressors, due to the Reynolds number effect. Losses in decelerating flow in a flow passage are sensitive to the Reynolds number effects. In contrary to the compression, the efficiency of expansion in turbines is not so sensitive to the Reynolds number; very small turbines are made with rather good efficiency because the flow acceleration stabilizes the boundary layer. This study presents a system where the kinetic compressor of a gas turbine is replaced with a pulse combustor. The combustor is filled with a combustible gas mixture, ignited, and the generated high pressure gas is expanded in the turbine. The process is repeated frequently, thus producing a pulsating flow to the turbine; or almost a uniform flow, if several parallel combustors are used and triggered alternately in a proper way. Almost all the compression work is made by the temperature increase from the combustion. This gas turbine type is investigated theoretically and its combustor also experimentally with the conclusion that in a 2 kW power size, the pulse flow gas turbine is not as attractive as expected due to the big size and weight of parallel combustors and due to the efficiency being in the order of 8 % to 10 %. However, in special applications having a very low power demand, below 1000 W, this solution has better properties when compared to the conventional gas turbine and it could be worth of a more detailed investigation. 关键词：脉冲燃烧器微型燃气轮机燃气涡轮机气体涡轮机雷诺数效应气体混合物压缩机高压气体

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Feasibility of Pulse Combustion in Micro Gas Turbines

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