A new type of radial variable density oblate spherical propellant powder (VDSP) with porous structure inside and high-density outside in same materials was designed to be used in small-caliber guns on the basis of analyzing how to implement burning progression.

From the point of view of enhancing the burning progressivity and total energy of gun propellant,a new conception gun propellant and charge i.

The research on the Marine Boiler s pressurized combustion and heat transfer;

Research on the boiler performance of pressurized combustion in naval steam boiler;

The paper points out the problem of condensing gas-fired boiler in practical application,and gives the conception of condersing gas-boiler with oxygen-enhanced combustion.