The high performance and instability in combustion chamber are the most challenging requirements for faster developments and technical advances in most of the engines. The design and development challenges of such engines are highly influenced by its combustion behavior taking place inside the combustion chamber. Studies on the injection, vaporization and combustion phenomena inside combustion ...

This letter presents a new solution for the Tunguska event of June 30th, 1908. The solution has been obtained starting from seismic data, is in fair agreement with the observational evidence, and supports the asteroidal hypothesis for the origin of the Tunguska cosmic body. It is based on an improved model of the hypersonic flow around a small asteroid in the Earth’s atmosphere.

We present an improved technique for automated interactive interferometric image data analysis and demonstrate its application to a wide range of flow configurations and conditions. The examples that we present to illustrate the technique range from the comparatively low velocity flow associated with the flight of an archery arrow to the hypersonic flow in a free-piston shock tunnel.

Planar laser-induced fluorescence (PLIF) images of hypersonic flow over a wedge are compared with a theoretical PLIF model. The synthetic images, which include the effects of collisional quenching, are based on a perfect-gas treatment of the fluid mechanics, assuming frozen chemistry. We find very good agreement between the model and the experimental measurements.

A theoretical study is made of hypersonic flows over thin bodies subject to the combined effect of leading-edge bluntness^, boundary-layer displacement as well as surface incidence,, Within the scope of the boundary-layer theory and the hypersonic small-disturbance theorys an approach is developed based on a flow model consisting of three adjoining regionss an inner laminar boundary layerj an o...