Application of quantitative two-line OH planar laser-induced fluorescence for temporally resolved planar thermometry in reacting flows

摘要: A temporally resolved approach for measurement of two-dimensional temperature fields in reacting flows is experimentally investigated. The method, based on planar laser-induced fluorescence the hydroxyl (OH) radical, applicable many combustion environments, including variable density flow fields. As a means examining accuracy technique, images, from 1300 to 3000 K and 0.4 3 atm, have been acquired shock-heated H(2)-O(2)-Ar with two-laser, two-image ratio scheme. complete system producing accurate, effectively instantaneous images described; includes single-shot monitors laser-sheet energy distributions spectral profiles. Temperature obtained OH A(2)Σ(+) ? X(2)II (1, 0) P(1)(7)-Q(2)(11) transition pair exhibit systematic error only 7% over entire range conditions, most likely dominated by shot-to-shot fluctuations lasers'spectral largest source photon shot noise. group pairs that provide good sensitivity strong signals reduced shot-noise flow-field conditions also presented.