3 results about "Expansion wave" patented technology

The application relates to the field of pipe materials, in particular to a PE and steel skeleton composite pipe and a pipe material connecting structure. The pipe body is provided with a socket end and a spigot end fixedly arranged at two ends of the pipe body respectively, the socket end is used for supporting the spigot end of another pipe material, at least one expansion wave is arranged in the socket end, an inner groove of the expansion wave is used for mounting a sealing ring, the outer wall of the spigot section can be matched with the inner ring of the sealing ring, a first pair of locking pieces are fixedly arranged on the socket end, a second pair of locking pieces capable of being fixedly locked with the first pair of locking pieces of another pipe material are fixedly arranged on the pipe body, the spigot end can be axially pressed against the socket end or the pipe body of another pipe material, the axial position of the first pair of locking pieces relative to the second pair of locking pieces of another pipe material is relatively adjustably arranged, so that the stretching degree of the expansion wave can be adjusted to adjust the tightness of the sealing ring. The application provides the PE and steel skeleton composite pipe and the pipe material connecting structure, the pipe material and the connecting structure are convenient to install, have good sealing performance and the tightness of the sealing ring can be adjusted.

The present application relates to the technical field of aviation, and in particular to a supersonic civil aircraft configuration. In the supersonic civil aircraft configuration of the present application, engine nacelles are mounted above a rear fuselage between wings and horizontal stabilizers; the lower portions of inlets are shielded by the trailing edges of the wings, and the lower portions of outlets are shielded by the leading edges of the horizontal stabilizers; by means of the shielding effect of the wings and the horizontal stabilizers, shock waves generated by engines are prevented from propagating to the ground, effectively reducing the ground sonic boom loudness of such an aircraft; the engines and pylons can perform small-angle pitch deflection around pivot shafts in the pylons, thereby adjusting mounting angles of the engines and improving the propulsive efficiency of the engines under off-design operating conditions; during supersonic cruising, the tips of the horizontal stabilizers can be folded upward to provide an additional vertical stabilizer volume, so as to compensate for the loss of vertical stabilizer efficiency during supersonic cruising, and preventing expansion waves generated by engine exhaust nozzles and the horizontal stabilizers from propagating to the ground; and during low-speed takeoff / landing, the tips are unfolded to ensure a large vertical stabilizer area, so as to meet the requirements of trim in takeoff / landing configuration.

This invention relates to a high-efficiency cooling system for supersonic turbine blade tips based on shock wave interference effects. Specifically, it involves setting film cooling holes of different sizes in the leading and trailing edge regions of the turbine blade. Through numerical simulation, the wave system structure of the blade tip clearance is accurately captured, clarifying the distribution of high-pressure / low-pressure regions formed by shock wave interference. The relationship between shock waves and tip heat transfer and flow field is precisely analyzed, as well as the flow field distribution within the clearance, which differs from conventional subsonic blade tip clearances, due to the complex wave system structure of shock waves and expansion waves. By arranging film cooling holes of different diameters and spacings close to the pressure side in the leading and trailing edge regions, the non-uniform spatial layout of the cooling holes is optimized, greatly improving cooling efficiency and targeting. This solves the cooling failure problem caused by neglecting the influence of shock wave interference, achieving precise matching between flow field characteristics and cooling structure design, resulting in greater targeting.