A high temperature uniformity cold and hot base plate runner structure for the environmental wind tunnel test section

Abstract

The invention provides a high-temperature-uniform hot and cold floor channel structure for an environmental wind tunnel test section, the first-stage liquid inlet pipe, the second-stage liquid inlet pipe, the third-stage liquid inlet pipe and the fourth-stage liquid inlet pipe are laminated The liquid inlet pipeline is divided into eight by distribution, and the first-level liquid outlet pipeline, the second-level liquid outlet pipeline, the third-level liquid outlet pipeline, the fourth-level liquid outlet pipeline and the fifth-level liquid outlet pipeline are stacked and distributed to form sixteen in one The five-stage liquid outlet pipe of the liquid outlet pipe and the four-stage liquid inlet pipe of the liquid inlet pipe are respectively connected to the two upper ports and the bottom middle port of the "U" in the U-shaped flow channel by welding ; In the environmental test involving simulated temperature stratification, the stacked distribution of the inlet and outlet pipes and the staggered arrangement of adjacent U-shaped flow channels are used to ensure uniform heat transfer on the basis of ensuring uniform distribution of flow, which is conducive to the formation of the temperature boundary layer in the test section and The development has created conditions, and the temperature distribution uniformity of the bottom plate has been controlled within 1 °C.

Description

technical field [0001] The invention relates to the technical field of plate heat exchangers for test equipment, in particular to a high-temperature-uniform cold and hot bottom plate flow passage structure for an environmental wind tunnel test section. Background technique [0002] In the environmental test involving simulating temperature stratification, in order to simulate the ambient air flow under various stable and unstable conditions, and to ensure a certain Reynolds number range, the temperature profile needs to form a large temperature difference, which requires the cave circuit The set heat exchanger interacts with the bottom plate of the test section to produce natural convection heat transfer, and its temperature boundary layer is gradually formed and developed. The control condition of high temperature boundary layer requires that the temperature difference between entering and leaving the bottom plate of the test section should be as small as possible, and the ...

AI Technical Summary

Problems solved by technology

By welding the two ends of the metal bottom plate in the test section, the in-line pipes are divided into multiple channels and connected with the flow channels of the metal bottom plate respectively, and the bottom plate is heated and cooled in the form of the brine entering and exiting from one end of the in-line pipes. Cooling, the flow direction of the brine can be parallel flow or counter flow, but the structure layout of the in-line pipe itself is the characteristic of single inlet and multiple outlets, which leads to unstable flow of each flow channel on the bottom plate, which may be evenly distributed or extremely distributed. Uneven, the temperature distribution uniformity of the bottom plate is difficult to control within 1°C

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