We know that ozone is a very unstable chemically and also poisonous for living environment. To increase oxygen content in GDI engine do we really need ozone or can we directly inject oxygen, which is not harmful for living environment?
Injection of O2 has been carried out by few researchers and have given some positive outcomes.
Like Rolf Pfeiffer
said, Ozone has 1.5 times higher concentration of oxygen, which might be a added advantage considering more amount of fuel can be injected in a given time.
but all its negative and positive outcomes can only be found by using and testing the same.
It depends on what you intend to research - solely the technical merits of O3 injection on the combustion process, or to look at the broader picture including how/where you would source/store/produce said O3 for and in the vehicle.
If you're interested in exploring the admittance of an oxidizer into an engine, there may be greater merit in aqueous H2O2 than gaseous O3. On a per unit volume basis at ambient conditions, there's more free oxygen stored in 1 L of H2O2(l) than 1L of O3(g). Now, for practical purposes you wouldn't inject pure H2O2 into an engine, but aqueous H2O2 at 40 and 70% w/w are widely manufactured and relatively easily obtained. In neat H2O2 and its aqueous forms, there is the "free" charge cooling effect of the latent heat of vaporization to be considered (potential for NOx reduction and reduced peak firing cylinder pressure), as well as the exothermic latent heat of dissociation and any impacts on the combustion kinetics due to the dissociation radicals H, O and OH formed.
GDI is gasoline direct injection. Since oxyzen is not gasoline, it is not injected in combustion chamber. Oxyzen is supplied with air while in intake stage.