Study on the influence of discrete distribution model on gas temperature 2-dimensional reconstruction measurement

Aiming at the measurement problem of aero-or aerospace engines combustion flow field temperature section distribution using 2-dimensional reconstruction technique, tunable diode laser absorption spectroscopy based on algebraic reconstruction technique is developed. The traditional ART iterative algorithm is perfected by adding a modify factor to relaxation parameter and some prior information such as nonnegative constraint and smoothness factor. The impact of the discrete distribution model on the reconstruction measurement result is analyzed in the ways of simulation and experimental research. Beam number threshold l for different discrete distribution models is put forwarded to provide guidance for the practical application on the engine diagnosis and assessment.