Combination of planar laser optical measurement techniques for the investigation of pre-mixed lean combustion

摘要: This paper summarizes recent efforts of applying combinatory or simultaneous multifaceted planar laser optical measurement techniques in reactive flow. The homogeneous (partially) premixed lean combustion aircraft engines is the most promising combustion concept for sustainable reduction fuel consumption and emissions. requires a 30-40% cooling air These changes require an efficient to deal with increased demands like higher temperature, higher pressure reduced Overall on homogeneity temperature distribution flow increase take into account heat load walls at lean combustion. Planar capable providing different measurands were successfully combined common set up enable rapid data acquisition consecutively even simultaneously. Within high single sector combustor (SSC) interaction between pre-mixed lean flame near wall film observed realistic (here 5 bars) preheat temperature (450 K). One main advantages SSC facility its accessibility from three sides. In present application effusion-cooled mesh holes represents the fourth side serves qualification near wall investigations. A first assessment design achieved by global velocity field, spatial release heat, temperature field pre-mixing behavior air concept within central (symmetry) plane. For this purpose previously established spectroscopic measurement are used such as chemiluminescence OH radical qualitative visualization release, planar laser-induced fluorescence (PLIF) study the mixing properties well distributions. Particle image velocimetry (PIV) visualized quantified swirling, recirculating field. PIV measurements were acquired synchronized PLIF measurements single-pulse basis obtain correlated information velocity [OH] distribution temporal resolution. After global characterization near-wall PIV/LIF were carried out resolution close proximity effusion cooled effort visualize the structure jets detail.