M.Sc Thesis

M.Sc StudentShukhman Yury
SubjectStudy of Internal Combustion Engine Sensitivity to
Environmental Conditions
DepartmentDepartment of Mechanical Engineering
Supervisors PROFESSOR EMERITUS Michael Shapiro
ASSOCIATE PROF. Leonid Tartakovsky
Full Thesis text - in Hebrew Full thesis text - Hebrew Version


Many motor vehicles (fire-fighting cars and trucks, helicopters, airplanes etc.) are used for conflagration extinguishing purposes. It is clear that their engines aspirate air containing combustion inhibitors, which are used for flame suppression, but until now there is no available information about the influence of this fact on engine performance. This thesis presents results of an experimental study on the influence of combustion inhibitors, such as Halon 1301 (CF3Br) and CO2, contained in the ambient air, on the performance of compression ignition (CI) and spark ignition (SI) engines. Substantial differences in the response of CI and SI engines to the inhibitor presence in the aspirated air are revealed. Starting from relatively small concentrations of CF3Br, an increase of the CI engine speed with a simultaneous decrease of the brake specific fuel consumption are observed. The speed rise may reach 80% of its initial value.  Dramatic deterioration, approximately by a factor of 3, in the efficiency of SI engine's catalytic converter (CC) is observed after a short-time exposure of SI engine to the ambient air containing Halon 1301. Chromatographic analysis of exhaust gases during exposure of the engines to CF3Br inhibitor indicates the presence of harmful substances that are highly corrosive, and dangerous for human health.