4results about How to "Improve rectification effect" patented technology

This invention discloses a porous rectifying structure for the afterburner of a variable cycle engine, comprising a rectifying orifice plate installed in an annular channel between the turbine outlet and the flame stabilizer. The orifice plate is symmetrically arranged along its radial central axis, with the clogging area facing the turbine inflow and axially aligned with the heat shield inlet. The orifice plate height is 2 / 3 of the channel height between the central cone and the heat shield. The plate has uniformly distributed pores with an equivalent diameter of 10-20 mm along the radial direction, with a clogging ratio of 5%-25%. This invention forms a multi-stage mixing interface through the radially gradient porosity pore arrangement, promoting shear mixing of the high-temperature internal combustion gas and the external bypass gas. Simultaneously, the static pressure difference across the orifice plate drives the external bypass gas flow into the heat shield cooling channel, increasing the cooling flow rate, improving the uniformity of the upstream velocity field of the flame stabilizer, eliminating the recirculation zone inside the heat shield, reducing the thermal load on the casing wall, and controlling the total pressure loss to within 3%, achieving high-stability combustion and reliable thermal protection under a wide bypass ratio.

The rectifying assembly comprises a plurality of stacked net elements, each net element comprises an annular support and a net plate which are integrally formed, the thickness of each annular support is larger than that of each net plate, a gap is formed between every two adjacent net plates, and a plurality of overflowing holes are formed in each net plate in an array mode. A positioning protrusion is arranged on one side wall of the annular support, a positioning groove is formed in the corresponding position of the other side wall of the annular support, and the positioning protrusion of one net element is embedded into the positioning groove of the other net element so that the adjacent net elements can be assembled and fixed. The structures of all the net elements in the rectification assembly are the same, that is, only one part is needed, a proper number of net elements are selected and stacked according to actual needs, and a good rectification effect can be achieved; by pressing the adjacent annular supports, the adjacent net elements can be assembled and fixed, special jigs and equipment do not need to be designed, the assembling cost is low, the assembling mode is simple, the assembling efficiency is high, and connection is stable and reliable.

The present application relates to water meter equipment technical field, especially relates to a kind of ultrasonic water meter structure for realizing U0D0 installation environment, and the ultrasonic water meter is DN20 ultrasonic water meter, and the one end of DN20 ultrasonic water meter is connected with DN20 ball valve, the inside of DN20 ultrasonic water meter is equipped with the whole of movement, and the cross section of the internal flow passage of movement is multi-arc line structure.The beneficial effects of the present application are:the flow passage structure of the multi-arc combination designed in the present application can realize the U0D0 installation of ultrasonic water meter, and numerical simulation analysis can prove that the influence caused by ball valve disturbance when the ball valve opening of the present application is 30 ° is below 1%, and the pressure of U0D0 water meter can be reached, and the influence of the ball valve of 30 ° opening of the present application on measurement accuracy is 2.96%, by comparing with conventional circular flow passage structure, it is confirmed that the anti-disturbance effect of the multi-arc structure of the present application is obviously improved, and has good rectification effect.

The application discloses a double-layer noise reduction air guide ring, which comprises an inner air guide ring layer and an outer air guide ring layer. The inner air guide ring layer comprises a circular ring segment, a mounting panel, an inlet flow guide segment and an outlet diffuser segment. The inlet flow guide segment and the outlet diffuser segment are fixedly connected with the two ends of the circular ring segment respectively. The inlet flow guide segment is in a circular arc shape. The mounting panel is fixedly connected with the side of the inlet flow guide segment, which is away from the circular ring segment. The outer air guide ring layer comprises a flat segment, a circular arc segment and a partition plate. The end of the circular arc segment, which is close to the inner air guide ring layer, is provided with an outer layer outlet end. The end of the circular arc segment, which is away from the inner air guide ring layer, is provided with an outer layer inlet end. The mounting panel and the flat segment are provided with a connecting structure. The partition plate is provided with a plurality of partition plates. The resonant cavities between the adjacent partition plates are different in size. The application further discloses a fan comprising the double-layer noise reduction air guide ring. The application has the advantages of high fan efficiency and low air inlet noise.