Mars wind tunnel with sand and dust simulation

A wind tunnel, sand and dust technology, applied in the direction of machine/structural component testing, measuring devices, instruments, etc., can solve the problems that it is difficult to ensure the uniformity of sand and dust distribution in the test section, and cannot realize high wind speed simulation, so as to improve the boundary layer The effect of blocking effect

CN111337218APending Publication Date: 2020-06-26中国航空工业集团公司哈尔滨空气动力研究所
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2020-06-26

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Abstract

The invention aims at providing a Mars wind tunnel with sand and dust simulation. The wind tunnel is horizontally arranged in a vacuum container and comprises a collector, a stable section, a contraction section, a test section, an ejector section, an outlet diffusion section, an ejector, and a first diffusion section. The test section is connected with the first diffusion section; the first diffusion section is connected with the ejector section; the ejector section is connected with the diffusion section, a transitional equal straight section is arranged between the ejector section and the diffusion section, and the ejector is arranged at the inlet of the ejector section. The diffusion angle of the first diffusion section is not more than 5 degrees, and the cross section area of the inlet of the ejector section is larger than that of the outlet of the test section. Compared with the prior art, simulation of the wind speed of 5-100 m / s in a large-span range can be achieved under the air pressure of 100 Pa only by consuming a small amount of air, the flow field of the test section is uniform and stable, and the sand and dust environment of the Mars can be simulated under the low air pressure.
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Description

technical field

[0001] The invention relates to a Martian wind tunnel with sand and dust simulation. Background technique

[0002] Wind tunnels are generally used to study the aerodynamic performance of aircraft and its related design. Conventional wind tunnels are developed for designing aircraft flying in the surface atmosphere. The Mars Wind Tunnel is an experimental simulation device developed for the Mars atmospheric flight environment. Different from conventional wind tunnels, the Mars Wind Tunnel can simulate the gas composition, atmospheric pressure, density and flow field environment on the surface of Mars. The atmosphere of Mars is very thin. The main component of the atmosphere is carbon dioxide. The density of the atmosphere is about 1% of that of the earth (similar to the density at the height of 30-40km on the earth's surface). The average pressure on the surface of Mars is only 600Pa. Local or regional sandstorms on Mars can Occurs frequently in different sea...

Examples

Embodiment 1

[0017] A Martian wind tunnel with sand and dust simulation. The wind tunnel is placed horizontally in a low-pressure vacuum container and adopts the structure of a straight-line wind tunnel, including a collector 1, a stable section 2, a contraction section 3, a test section 4, The ejector section 6, the exit diffuser section 7 and the ejector 8, the collector 1 is in the shape of a bell mouth, the collector 1 is connected to the entrance of the stabilizing section 2, the section of the stabilizing section 2 is square, and a layer of honeycomb is reserved inside And the connection port of the multi-layer damping net, the honeycomb and the damping net are optional parts, which can be selected and installed according to the needs of the test. The outlet of the stable section 2 and the inlet of the contraction section 3 are connected by flanges, and the outlet of the contraction section 3 is connected to the test section. The inlet of section 4 is connected by flange. This wind tu...

Embodiment 2

[0023] This embodiment adopts the structure of Embodiment 1, adjusts the air supply flow rate entering the ejector chamber 8 through a high-precision regulating valve, changes the injection flow rate of the ejector, and then changes the wind speed in the test section, 9 ejectors 9 nozzles of the device are arranged in parallel at equal intervals, and each nozzle has 9 injection holes, a total of 81 holes.

Embodiment 3

[0025]This embodiment adopts the structure of Embodiment 1. When carrying out the sand and dust simulation test, the method of conveying sand and dust by pressure feeding is adopted, so that the test gas with higher pressure enters the sand and dust conveying pipeline 12 and mixes with the sand and dust for transportation. The Venturi injector is finally ejected from the sand dust nozzle 11 in the contraction section. In order to spread the sand dust in the test section 4 evenly, the outlet structure of the sand dust nozzle 11 adopts a multi-layer staggered form, and adopts the injection direction of the reverse air flow , this method can also keep the nozzle away from the entrance of the test section and improve the flow field quality of the test section. When the sand and dust test simulation is not needed, the sand and dust nozzle and its pipeline can be removed, and the dust concentration meter can be removed at the same time to further improve the flow field quality of the...