Brief discussion on the application of spray well point method in soft foundation excavation;

Based on the current research status of domestic & foreign ultra high pressure jet drilling techniques, the paper discusses the feasibility and reality of the domestic research of 30~50 MPa down hole booster pump combining with the current jet drilling conditions.

As a new popular topic, the technique of overpressure jet drilling is being paid people's attention.

Meanwhile,the feasibility and implement method of jetting drilling on ultra-deep wells was analyzed,and point out that the ultra-deep well hydraulic parameters design should follow the minimum flow rate designing method,and also provides good reference for ROP improvement of ultra-deep wells.

The numerical simulation three-dimensional and two-phase turbulent reactive flow in a annular combustor is conducted and the performance of combustion from two aspects of the combustor structure and multiple injections is discussed,where RSM Reynolds-stress turbulence model,EBU-Arreniue combustion model and discrete ordinate radiation model are employed.

Based on the numerical simulation, the air flow, mixture of air and fuel, combustion in the combustor are simulated from the point of the multiple injections firstly.