As a new injection molding technology, avoiding the breakthrough phenomenon of core melt, obtaining longer penetration length on skin melt and good uniformity of core melt in sandwich injection molding are quite significant for its application as well as theoretic study of sandwich injection molding.

The test model used in this study consists of circular leading edge and elliptic leading edge.

The compressor blade leading edge flow is studied by hydrogen bubble flow visualization.

In this paper, the thermal response in the thermal protection layer of leading edge, which is usually used in reusable thermal structure, is numerically simulated.

The evaluation method to identify the steam zone and the steam front as well as the behavior of the steam spreading in the oil reservoir has been developed.

Test and the Monitor Techniques of Waterflood Front and Frature;

Reservoir engineers pay attention to waterflood direction and waterflood front location,which are analyzed and determined by most of reservoir engineers experientially.

However, the dynamic monitoring of dual step horizontal wells is a kind of new task, and it is difficult to diagnose the advancing direction of injected water, the main displacement direction, and the area swept by waterflood front.

Model building method which forms radial singular unit meshes in the crack front and the method which applied boundary conditions of crack model by finite element contact technique are used and then the simulation of the singular stress field of the crack front and the far field stress of the crack model are realiz.