Experimental wind tunnel device containing snow dune morphology and layered deposition structure evolution

Abstract

The utility model discloses an experiment wind tunnel device containing snow dune morphology and layered deposition structure evolution, comprising an air channel, one side of the air channel is provided with an air inlet, the bottom end in the air channel is provided with a wedge close to the air inlet, and the bottom end in the air channel is provided with a roughness element on one side of the wedge. A simulated earth surface pad is installed at the position, on one side of the roughness element, of the bottom end in the air duct, a sand layer and a sand dune model are sequentially arranged at the top of the simulated earth surface pad, and a feeder is installed at the top of the air duct. According to the device, the wedges and the roughness elements are arranged on the inner side of the air duct to simulate an atmospheric boundary layer flow field, the sand bed and sand dune models are laid, snow particles are released to form a snow-containing sand dune scene, various measuring devices are matched, macroscopic data of sand dune evolution and sand and snow transportation can be accurately obtained, a cross-scale simulation method is provided for research of the snow-containing sand dune, and the device is suitable for popularization and application. And application of researches such as paleoclimate simulation in other regions and planets is promoted.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wind tunnel design technical field especially relates to an experimental wind tunnel device of snow dune shape and layered deposition structure evolution. BACKGROUND

[0002] The dune is the accumulation of sand particles under the action of wind, and is a common landform type in the Victoria Valley of the Antarctic and other regions, the forming process thereof strongly depends on initial dynamic conditions and surface properties, and development and evolution thereof is a nonlinear system of multiple space-time scales, and spatial pattern change reflects wind information, sand source supply and surface characteristics.

[0003] The snow dune is a research frontier of the dune landform in the Antarctic region and even on Mars at present, the morphological evolution and unique sand-snow layered deposition structure of the snow dune contain information such as wind direction, wind speed and air pressure, and can be used for researches in aspects of large-scale paleoclimate simulation, circulation mode and climate change, but the current researches are mostly geological survey and data extraction facing specific deposition phenomena in the field, and there is still lack of a simulation method suitable for the cross-scale complex dynamic process of the snow dune involving wind, sand and snow and other matters, thereby limiting the application of analysis results and rules in other regions / planets.

[0004] Therefore, the applicant proposes an experimental wind tunnel device of snow dune shape and layered deposition structure evolution to solve the problem. UTILITY MODEL CONTENT

[0005] The utility model provides an experimental wind tunnel device of snow dune shape and layered deposition structure evolution, and solves the problem proposed in the background.

[0006] In order to solve the above technical problems, the utility model provides an experimental wind tunnel device of snow dune shape and layered deposition structure evolution, which comprises a wind channel, a wind inlet is installed on one side of the wind channel, a wedge is installed at the bottom end of the inside of the wind channel close to the wind inlet, a rough element is installed at the position of the bottom end of the inside of the wind channel on the side of the wedge, a simulated ground pad is installed at the position of the bottom end of the inside of the wind channel on the side of the rough element, a sand layer and a dune model are sequentially arranged on the top of the simulated ground pad, a feeder is installed on the top of the wind channel for the supply of snowflakes, and a guide pipe at the bottom of the feeder penetrates into the inside of the wind channel.

[0007] Preferably, a filter screen plate is installed at the air outlet end of the wind channel, and the filter screen plate is designed as a composite multilayer.

[0008] Preferably, an optical measuring device is arranged at the position of one side of the wind channel, an opening is arranged on the side wall of the wind channel, optical glass is installed on the inner side of the opening, the optical glass is used for the passage of measuring light of the optical measuring device, and the optical glass is located at the position of the dune model.

[0009] Preferably, the top of the air duct is provided with a laser emitter at the location of the dune model.

[0010] Preferably, the top of the simulated ground surface pad is provided with a wind speed profile measuring device penetrating the sand layer, and the material guide pipe is located between the roughness element and the wind speed profile measuring device.

[0011] Preferably, the top of the simulated ground surface pad is provided with a sand flux instrument, the sand flux instrument is located at a position behind the sand layer, and the sand flux instrument is located on one side of the dune model and close to the inner wall of the air duct.

[0012] Compared with the related art, the experimental wind tunnel device for the snow-containing dune topography and layered deposition structure evolution has the following beneficial effects:

[0013] In the utility model, the sharp wedge and the roughness element are arranged on the inner side of the air duct to simulate the atmospheric boundary layer flow field, the sand layer and the dune model are laid and the snow particles are released to form a snow-containing dune scene, and various measuring devices are matched to accurately obtain the macro data of dune evolution and sand snow transport, to provide a cross-scale simulation method for snow-containing dune research and to promote the application of paleoclimate simulation research in other regions and planets. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0015] Fig. 2 It is a schematic diagram of the overall three-dimensional sectional structure of the utility model.

[0016] In the drawing, the reference numerals are as follows: 1, air duct; 2, air inlet; 3, sharp wedge; 4, roughness element; 5, simulated ground surface pad; 6, sand layer; 7, dune model; 8, feeder; 9, material guide pipe; 10, sand flux instrument; 11, laser emitter; 12, optical measuring device; 13, optical glass; 14, filter screen; 15, wind speed profile measuring device. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0018] By Figs. 1-2The utility model provides a kind of sand dune model test device, including air duct 1, air duct 1 one side is equipped with air inlet 2, air duct 1 inside bottom end is equipped with sharp split 3 at the place close to air inlet 2, air duct 1 inside bottom end is equipped with rough element 4 at the position of sharp split 3 side, air duct 1 inside bottom end is equipped with simulation ground surface pad 5 at the position of rough element 4 side, simulation ground surface pad 5 top is sequentially provided with sand layer 6 and sand dune model 7, air duct 1 top is equipped with feeder 8, for the supply of snowflake, and feeder 8 bottom guide pipe 9 is inserted into air duct 1 inside, air duct 1 air outlet end is equipped with filter screen plate 14, filter screen plate 14 is composite multilayer design, can prevent sand fly out, air duct 1 one side position is equipped with optical measuring equipment 12, air duct 1 side wall is equipped with opening, opening inboard is equipped with optical glass 13, optical glass 13 is used for the measurement light of optical measuring equipment 12 to pass through, and optical glass 13 is located at the position of sand dune model 7, and optical measuring equipment 12 can be penetrated air tunnel side wall optical glass 13 and is observed and measured to sand dune model with non-contact, enough to obtain the topographic information of sand dune surface, such as the profile of sand dune, texture etc., with high-resolution image form presents the morphological characteristics of sand dune, air duct 1 top is equipped with laser emitter 11 at the position of sand dune model 7, for accurately measuring the relevant parameters of sand dune model, master the morphological evolution process of sand dune under the action of wind force, such as the height difference change of windward slope and leeward slope of sand dune etc., provide accurate spatial data for analyzing the dynamic development of sand dune, simulation ground surface pad 5 top is equipped with wind speed profile measurement equipment 15 passing through sand layer 6, can obtain the wind speed distribution from ground to certain height range, guide pipe 9 is located between the position of rough element 4 and wind speed profile measurement equipment 15, simulation ground surface pad 5 top is equipped with sand flux instrument 10, sand flux instrument 10 is located at the position behind sand layer 6, and sand flux instrument 10 is located at the side of sand dune model 7, close to air duct 1 inner wall, for measuring the mass or quantity of sand particle passing through unit area in unit time, namely sand flux.

[0019] Working principle: first, in the environmental wind tunnel, the wedge 3 and the rough element 4 are arranged to simulate the flow field structure of the atmospheric boundary layer, the airflow can form a natural airflow after entering from the air inlet 2, then the sand bed surface is laid at the entrance of the experimental section, the sand layer 6 with a length of 8m and a thickness of 5cm is laid, the stable wind-sand flow is ensured, the scaled sand dune model 7 is placed behind the sand layer 6, then the laser emitter 11, the wind speed profile measuring device 15, the sand flux instrument 10 and the optical measuring device 12 are installed, during work, the wind tunnel experiment is carried out in the winter low temperature environment, the axis wind speed of the experiment is set to 6, 8, 10, 12, 14m / s five working conditions respectively, the snow particles are released at the top of the wind tunnel with a duration of 0, 2, 4, 6, 8, 10, 12min to form the snow deposition layer on the sand dune (supplied by the feeder 8), the horizontal flux, the vertical flux and the wind speed profile in the particle transport process near the ground surface of the sand dune model are observed by using the laser emitter 11, the wind speed profile measuring device 15, the sand flux instrument 10 and the optical measuring device 12.

[0020] It should be noted that the relational terms herein such as first and second are used only to distinguish one entity or operation from another entity or operation without necessarily requiring or implying any such actual relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof are intended to cover a non-exclusive inclusion, so that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0021] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An experimental wind tunnel device for the evolution of sand dune morphology and stratigraphic structure, characterized in that, Include: The air duct (1), one side of the air duct (1) is installed with air inlet (2), the inside bottom end of the air duct (1) is installed with sharp split (3) near the air inlet (2), the inside bottom end of the air duct (1) is installed with rough element (4) at the position of sharp split (3) side, the inside bottom end of the air duct (1) is installed with simulated ground mat (5) at the position of rough element (4) side, the top of the simulated ground mat (5) is provided with sand layer (6) and sand dune model (7) in turn, the top of the air duct (1) is installed with feeder (8), and the bottom guide pipe (9) of the feeder (8) penetrates into the inside of the air duct (1).

2. The experimental wind tunnel device for simulating the evolution of sand dune morphology and stratigraphic structure according to claim 1, characterized in that, The air duct (1) is installed with filter screen plate (14) at the air outlet end, and the filter screen plate (14) is designed as composite multilayer.

3. The experimental wind tunnel device for simulating the evolution of sand dune morphology and stratigraphic structure according to claim 2, characterized in that, The air duct (1) is provided with optical measuring equipment (12) at one side position, the sidewall of the air duct (1) is provided with opening, the optical glass (13) is installed inside the opening, the optical glass (13) is used for the measuring light of optical measuring equipment (12) to pass through, and the optical glass (13) is located at the position of sand dune model (7).

4. The experimental wind tunnel device for simulating the evolution of sand dune morphology and stratigraphic structure according to claim 3, characterized in that, The air duct (1) is installed with laser emitter (11) at the top at the position of sand dune model (7).

5. The experimental wind tunnel device for simulating the evolution of sand dune morphology and stratigraphic structure according to claim 4, characterized in that The top of the simulated ground mat (5) is provided with wind speed profile measuring equipment (15) penetrating through the sand layer (6), and the guide pipe (9) is located at the position between rough element (4) and wind speed profile measuring equipment (15).

6. The experimental wind tunnel device for simulating the evolution of sand dune morphology and stratigraphic structure according to claim 5, characterized in that, The top of the simulated ground mat (5) is installed with sand flux instrument (10), the sand flux instrument (10) is located at the position behind the sand layer (6), and the sand flux instrument (10) is located at one side of the sand dune model (7) and close to the inner wall of the air duct (1).

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