Study of the formation of polycyclic aromatic hydrocarbons in the combustion chambers of aircraft engines

In this work, several methods for combined reactor modeling of carcinogenic polycyclic aromatic hydrocarbon (PAH) concentrations in aircraft combustion chambers for kerosene combustion were proposed and investigated. Settlement and experimental studies were carried out for a model combustion chamber of a small engine using three different combined approaches based on the results of three-dimensional CFD modeling. The first approach is to create a chain of sequential perfectly stirred reactors (PSR) and to replace individual combustion zones with reactors. The second approach uses ANSYS Fluent's automatically generated chemical reactor network (CRN). The third approach implements automatic generation of reactor chains according to a user-defined algorithm in the kinetic post-processor of the Chemkin Energico or KPPSMOKE program. We studied the atmospheric pressure combustion regime for liquid kerosene, with an air temperature behind the compressor of 423 K and an equivalence ratio of φ=0.22–0.33. PAH concentrations were determined experimentally by high performance liquid chromatography. As a result of the work, it was demonstrated that only the approach using kinetic post-processors shows the orders of PAH concentrations corresponding to the experimental ones.