报告摘要：
The development of a utility size fuel-flexible gas turbine that burns coal derived hydrogen, natural gas, and syngases is a key component of the U.S. Department of Energy’s Advanced Turbine Program. Several combustion technologies are being developed by gas turbine manufacturers to meet the very challenging < 2 ppm NOx emissions goal. The low-swirl combustion (LSC) method conceived at LBNL is one of the candidates. LSC is a stabilization method for premixed turbulent flames that has evolved from a laboratory research burner to an ultra-low emissions combustion technology for industrial heating and electric power generation. LSC exploits the propagating nature of premixed flames by allowing it to burn freely in a divergent and non-recirculating turbulent flowfield. This mechanism supports very stable ultra-lean premixed flames that emit low NOx emissions.  LSC flowfields exhibit similarity features that enable the flame to remain stationary within a wide range of velocities, fuel types, initial conditions, and mixture stoichiometry. A top level analytical model and engineering design rules have been developed for scaling and adaptation to industrial burners, megawatt size gas turbines, and microturbines. The adaptation of LSC to burn pure hydrogen began with laboratory studies to obtain basic information on the flowfields and the turbulent flame speeds. Recent results from rig-tests at gas turbine relevant conditions are encouraging, and show that the LSC concept is amenable to fuel-flexible operation. However, many fundamental and technical issues need to be resolved. The more challenging ones associated with short ignition delay, fast flame speed, flammability, high diffusivity, and chemical kinetics will be discussed.

报告人简介：
Dr. Robert K. Cheng is a Senior Scientist with the Environmental Energy Technologies Division of Lawrence Berkeley National Laboratory. He is the leader of the Combustion Technologies Group and is the Principal Investigator of research programs supported by the U. S. Department of Energy and other Federal and State Agencies. He received a B. S. (1972), a M. S. (1974), and a Ph. D. (1977) all from the Mechanical Engineering Department of University of California at Berkeley. He joined LBNL in 1977 and built an experimental research group on fundamental combustion fluid mechanics with emphasis on lean premixed turbulent flames. He has published over seventy journal articles on the use of laser diagnostics to study flame turbulence interactions. His discoveries of flame stabilization methods for ultra-low NOx emission combustion systems have generated three patents. These low NOx emission technologies are in various stages of development and commercialization for industrial heating and power generation. He is an active member of The Combustion Institute, ASME and the American Institute of Aeronautics and Astronautics.