Influence of a cooling channel on the infrared radiation performance of an ejector
An ejector of a gas turbine exhaust system reduces the temperature of the exhaust stream and decreases the infrared radiation intensity of exhaust gas.This paper presents a subsonic ejector structure with a cooling chan-nel and a comprehensive performance factor for evaluating a cooling channel ejector.A cooling channel is added to the nozzle of the original ejector,and the coolant mixes with the high-temperature gas directly at the center of the mainstream,which can destroy the distribution of exhaust cladding,improve the uniformity of the mainstream tem-perature,and reduce the temperature in the center.This paper adopts a numerical simulation method to study the comprehensive influence of the number and depth of cooling channels and the layout of exhaust channels on the re-sistance,heat transfer,and outlet temperature distribution characteristics of the ejector.Reportedly,the number of channels is directly proportional to the heat transfer characteristics and inversely proportional to the resistance loss when single-row cooling channels are arranged.When double-row cooling channels are arranged,the resistance loss is reduced.An ejector with double rows and 12 channels can effectively reduce the total outflow temperature and uniform mainstream temperature,manifesting the highest comprehensive performance coefficient.
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