环境条件和残余燃烧气体对周期性定容燃烧运行的影响

2019/01/16   下载量： 0 次

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应用领域 能源/新能源
检测样本 其他
检测项目
参考标准 暂无

采用 Nd:YAG, 532 nm MESA PIV 激光器，SA-Z Photron 20KHz高速相机，LaVision的DaVis8.4软件系统以及功能特别强大的可编程时间控制单元。尤其是其可针对不同被测速度，改变双帧时间间隔的测量模式，有效第测量了定容燃烧中的流场。

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The pressure-gain combustion concept is a solution envisioned to increase the thermodynamic efficiency of gas turbines. This article addresses the behaviour of piston-less constant-volume combustion in relevant conditions of engine application. For this purpose, a lab-scale combustion vessel (0.3 L) is run in cyclic operation (10 Hz) with an improved control over the boundary conditions. This facility features the spark-ignited, turbulent combustion of n-decane directly injected in preheated air (423 K, 0.4 MPa), with an overall equivalence ratio of 0.9. Solenoid valves are used to perform the air intake and burnt gas exhaust. A 0D analysis is developed and used to compute the gas thermodynamic evolution based on the experimental pressure traces. The effect of the main operating parameters on the combustion process is discussed: ignition delay, exhaust pressure and wall temperature. The vessel is
operated without scavenging, hence the exhaust pressure drives the amount and the temperature of residual burnt gas (16–39% according to the 0D analysis). Highly diluted cycles (exhaust pressure 0.2 MPa) exhibit a higher combustion efficiency, but have a longer combustion duration (3 times more) than those of low dilution (exhaust pressure 0.07 MPa). For a higher wall temperature representative of engine combustor (1000 K), the heat losses are directly reduced, which affects the residual burnt gas properties. This also influences the residual gas temperature (870–1030 K) as well as dilution (10–26%).

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北京欧兰科技发展有限公司
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