An engine test bench exhaust pipe cooling device

Abstract

The invention discloses a cooling device of an exhaust pipe of an engine test bed. The cooling device comprises an inlet flange, a circulating cooling water draining ring, a pipe combination element, a circulating cooling water inflowing ring, and an outlet flange. The pipe combination element being a convergent pipe includes an outer pipe cylinder and an inner pipe cylinder, wherein the two cylinders are fixedly connected by a steel bar. Three spraying rings are arranged at the outer wall of the outer pipe cylinder; nozzle holes are formed uniformly in the outer pipe cylinder and the inner pipe cylinder along peripheral directions by corresponding to the three spraying rings; and nozzles are arranged in the nozzle holes. The inlet flange and the outlet flange are fixedly connected with the two ends of the outer pipe cylinder and the inner pipe cylinder; the two ends of the circulating cooling water draining ring and the circulating cooling water inflowing ring are fixedly connected with the flanges and the outer pipe cylinders; and circulating cooling water draining holes and circulating cooling water inlet holes are formed uniformly in the outer pipe cylinder along the peripheral direction by corresponding to the circulating cooling water draining ring and the circulating cooling water inflowing ring. According to the cooling device, on the basis of combination of interlayer circulating cooling and spraying cooling, the cooling efficiency is enhanced.

Description

technical field [0001] The invention relates to a pipeline cooling device, in particular to an exhaust pipeline cooling device for an engine test bench. Background technique [0002] When simulating the high-altitude flight state of the engine on the ground, an exhaust device needs to be installed. In the prior art, metal pipes are usually used as the exhaust device to discharge the high-temperature gas discharged from the engine; however, the gas discharged by the high-altitude engine is high-temperature gas , its temperature is usually above 350°C. When the high-temperature gas discharged from the engine flows inside the metal pipe, it will cause metal deformation. Long-term use will cause serious deformation or even scrapping of the metal pipe; the prior art usually uses nozzles to spray water into the pipe Cool the high-temperature gas in the pipeline, but a small amount of cooling water cannot achieve a good cooling effect, and a large amount of cooling water vaporized ...

AI Technical Summary

Problems solved by technology

[0002] When simulating the high-altitude flight state of the engine on the ground, an exhaust device needs to be installed. In the prior art, metal pipes are usually used as the exhaust device to discharge the high-temperature gas discharged from the engine; however, the gas discharged by the high-altitude engine is high-temperature gas , its temperature is usually above 350°C. When the high-temperature gas discharged from the engine flows inside the metal pipe, it will cause metal deformation. Long-term use will cause serious deformation or even scrapping of the metal pipe; the prior art usually uses nozzles to spray water into the pipe Cool the high-temperature gas in the pipeline, but a small amount of cooling water cannot achieve a good cooling effect, and a large amount of cooling water vaporized into water vapor will increase the gas flow rate and increase the burden of subsequent pumping; at the same time, the existing technology usually uses centrifugal Nozzles or DC nozzles spray cooling water into the pipeline, but the spray distance of the centrifugal nozzle is limited. When the flowing high-temperature gas flows through, the cooling water will be blown away directly, and the high-temperature gas inside the pipeline cannot be cooled, while the DC nozzle, although cooling The injection distance of the liquid is long, but the coverage area of ​​the injection is low, and the high-temperature gas cannot be cooled immediately. Therefore, the cooling efficiency of the centrifugal nozzle and the direct-flow nozzle used in the prior art is low, and the cooling effect on the high-temperature gas cannot be achieved.

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