Diagnostic of combustion process inside the turbojet combustion chamber byElectrical Capacitance Tomography

摘要

The Electrical Capacitance Tomography (ECT) for visualization of combustion process is based on measurements of variation ofelectrical properties of flame, such as electricalpermittivityandconductivity of the reaction zone. Signal level depends on the concentrations of the various kinds of charged particles in combustion zone. Possible carriers are electrons and positive and negative ions. These charged particles may be formed as a result of chemical reactions, which are called chemi-ionization and thermal ionization. The measurements of these properties in the combustion chamber are made with specially designed electrodes. Distribution of charged particles in combustion zone is reconstructed from measurements of electrical signal on the electrodes using linear (LBP) or iterative linear back projection (ILBP) algorithms