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

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.

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.