The working process of secondary hot gas injection thrust vector control for solid rocket motor is numerically simulated using quasi-one-dimensional unsteady N-S equations.

Gas conduction,secondary hot gas injection as well as their interaction with the main flow of the motor were investigated respectively.

The unsteady effect of closure process for hot gas secondary injection thrust vector control(HGSITVC) system was studied by computational fluid dynamics(CFD) analysis technique.

And last, an novel conception of "Dividing Injection" for port injection engine is put forward.

Optimization of response surface of secondary gas injection thrust vector control;

Investigation on secondary gas injection for solid rocket motor based on thrust vector control;

Computation of three-dimensional flow field in secondary gas injection for thrust vectoring nozzle

In order to strengthen emission controlling of the carburetor motorcycle engines,the metering characteristics of carburetor are adjusted,combustion chamber as well as intake and exhaust ducts are further optimized,and secondary air injection system and oxidation type catalytic converter.

In order to enhance the air compensating effect of the secondary air injection system, a model for a motorcycle engine is set up and the performances of the model JS125-12A are calculated and analyzed by using the engine performance analyzing software package of AVL BOOST.