GENERATING LAMINAR FLAME SPEED LIBRARIES FOR AUTOIGNITION CONDITIONS

被引：0

作者：

Puduppakkam, Karthik V. ^{[1
]}

Modak, Abhijit U. ^{[1
]}

Wang, Cheng ^{[1
]}

Hodgson, Devin ^{[1
]}

Naik, Chitralkumar V. ^{[1
]}

Meeks, Ellen ^{[1
]}

机构：

[1] ANSYS Inc, San Diego, CA 92121 USA

来源：

PROCEEDINGS OF THE ASME TURBO EXPO 2020: TURBOMACHINERY TECHNICAL CONFERENCE AND EXHIBITION, VOL 4B | 2020年

关键词：

BURNING VELOCITIES; HIGH-PRESSURE; AIR MIXTURES; IGNITION; TEMPERATURE; PROPAGATION; FUELS; DEFLAGRATION; COMBUSTION; SIMULATION;

D O I：

暂无

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

With advanced gas turbine combustor and internal combustion engine designs, autoignition can happen alongside flame propagation. Laminar flame speeds are required to model flame propagation. Determining laminar flame speeds using simulation assumes flames are freely propagating, an assumption that is not valid when autoignition does occur. From a CFD modeling viewpoint however, it is useful to have extrapolated laminar flame-speed values over a wide range of conditions, to allow CFD to operate smoothly and avoid discontinuities while calculating flame-propagation properties. In this work we focus on developing an approach for generating laminar flame-speed libraries under both nonigniting and autoigniting conditions. Following a test of whether autoignition occurs, laminar flame speeds are either modeled or extrapolated. The details of the approach implemented and its validation are explained. We assess the accuracy of the extrapolation employed by calculating relevant coefficients based on flame speeds from nearby operating points. Recommendations are made for the time scales to be used in determining autoignition occurrence. Fuel effects are also explored in this context.

引用

页数：13

共 52 条

[1] Parameters influencing the burning rate of laminar flames propagating into a reacting mixture [J].