CN111412382A

CN111412382A - Load reduction model experiment air supply device

Info

Publication number: CN111412382A
Application number: CN202010271870.8A
Authority: CN
Inventors: 潘光; 施瑶; 赵海瑞; 宋保维; 黄桥高; 姜军
Original assignee: Northwestern Polytechnical University
Current assignee: Northwestern Polytechnical University
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2020-07-14

Abstract

The invention relates to a load reduction model experiment gas supply device, which uses a high-pressure nitrogen cylinder as a gas source, nitrogen belongs to inert gas, and the experiment process is safer. The pressure reduction process of the air source is realized through the air storage bottle, the input pressure of pneumatic elements such as a pressure regulating valve and the like is ensured within a pressure-resistant range, the pressure of high-speed flowing gas in the experimental process is ensured to be within a low-pressure range, and the experimental safety is greatly improved. The pressure and the flow in the pipe can be precisely adjusted through the pressure regulating valve and the flow valve.

Description

Load reduction model experiment air supply device

Technical Field

The invention relates to the field of hydrodynamic experiments, in particular to a novel air supply device for a load reduction model experiment.

Background

In recent years, the development of marine resources has tended to be blunted, and aircraft have played an increasingly important role in both military and civilian applications. The launch mode of modern aircraft tends to be diversified, often involving the process of entering water across the medium. The aircraft can be subjected to huge impact load in the process of entering water, a series of adverse effects such as structural deformation, instrument damage and the like are generated, particularly, in the process of entering water at high speed, the impact load of the aircraft is in positive correlation with the square of the speed, and therefore, the load reduction research of the aircraft in the process of entering water at high speed is very necessary.

The existing load reduction modes mainly comprise an active mode and a passive mode. The load reduction mode is active load reduction, the head of the aircraft is ventilated to generate supercavity surrounding the aircraft, and the action time of the supercavity and air is prolonged in the water entering process of the aircraft so as to achieve the purpose of load reduction. In the process of research, impact load and change of complex vacuole forms are involved, so that the research of only carrying out theory and numerical simulation is not enough, and related experimental research is needed.

Considering that the air needs to be ventilated at the head of the aircraft in the experimental process, the air volume needed when the aircraft enters water at a high speed is huge, if the physical experiment is directly carried out, the experimental preparation becomes complicated, the experimental design difficulty is increased, and the cost required by the experiment is expensive, so the difficulty of the experiment can be greatly simplified by carrying out the small model experiment. Small model experiments still need to consider how to deliver the gas source to the model head. Meanwhile, in order to research the load reduction effect under different air volumes, the air volume can be adjusted at any time in the experimental process. Therefore, it is necessary to design a set of air supply device adapted to the novel load reduction model experiment.

In the invention creation of publication No. 106932169B, a breather device for aeration experiments in a revolving body into water is disclosed, in which a cavity air chamber is provided inside the revolving body, and the integrity of the outer shape of the revolving body is maintained. However, when a model experiment is carried out, because the internal space of the revolving body is limited, a large amount of gas cannot be stored, and the flow rate of the sprayed gas cannot be changed in a large range, experimental research cannot be carried out when the flow rate is changed drastically, and certain limitation is brought to the development of a ventilation experiment.

Disclosure of Invention

Technical problem to be solved

In order to meet the technical requirements of experiments for head ventilation model water inlet and make up the defects of the existing experimental conditions, the invention provides a novel load-reducing model experiment air supply device, which can convey an air source to the head of a model to realize a ventilation process, can precisely adjust the ventilation volume, is simple and convenient to operate and has high feasibility and safety.

Technical scheme

A load-shedding model experiment gas supply device is characterized by comprising a high-pressure nitrogen cylinder, a gas storage cylinder, a PU hose, a pressure regulating valve, a flow meter and an acrylic sleeve; the air outlet of the high-pressure nitrogen cylinder is connected with the air inlet of the gas cylinder, and the valve at the air outlet of the gas cylinder, the pressure regulating valve, the flow valve and the flow meter are sequentially connected through the PU hose; the free end of the PU hose penetrates through the tail part of the experimental model and is fixedly connected with the acrylic sleeve through glue; the acrylic sleeve is fixed on the head section of the experimental model through a screw.

Advantageous effects

The load reduction model experiment gas supply device provided by the invention uses the high-pressure nitrogen cylinder as a gas source, nitrogen belongs to inert gas, and the experiment process is safer. The pressure reduction process of the air source is realized through the air storage bottle, the input pressure of pneumatic elements such as a pressure regulating valve and the like is ensured within a pressure-resistant range, the pressure of high-speed flowing gas in the experimental process is ensured to be within a low-pressure range, and the experimental safety is greatly improved. The pressure and the flow in the pipe can be precisely adjusted through the pressure regulating valve and the flow valve. And the pressure, temperature, flow and other data in the experimental process can be accurately recorded through the pressure regulating valve and the flowmeter. The firm connection of PU hose and experimental model can be realized through ya keli sleeve pipe. The device has the advantages of simple structure, convenience in operation and lower cost, and ensures the stable gas supply process in the novel load shedding model experiment process.

Drawings

FIG. 1 is a schematic view of the overall structure

FIG. 2 is a schematic view of the connection between the PU air tube and the model head

1-high pressure nitrogen cylinder, 2-gas storage cylinder, 3-pressure regulating valve, 4-flow valve, 5-flowmeter, 6-PU hose, 7-experimental model, 8-acrylic sleeve, 9-screw and 10-model head section.

Detailed Description

The invention will now be further described with reference to the following examples and drawings:

the invention uses a high-pressure nitrogen cylinder as a gas source, uses a gas storage cylinder to store gas, uses a PU hose to convey gas, uses a pressure regulating valve to regulate the pressure in a pipe, uses a flow valve to regulate the flow, uses a flowmeter to record the flow, and uses an acrylic sleeve to fixedly connect the PU hose with an experimental model.

The method comprises the steps of firstly injecting nitrogen with the maximum pressure of 20Mpa in a high-pressure nitrogen cylinder into a 300L gas cylinder, controlling the maximum pressure in the gas cylinder to be 1Mpa, then realizing the precise adjustment of the gas pressure in a PU tube by adjusting a pressure regulating valve, adjusting the flow rate in the PU tube by adjusting a flow valve, recording information such as the flow rate, temperature and the like according to the reading of a flowmeter, enabling the PU tube to enter the interior of a model through a hole at the tail part of the model, and fixedly connecting an acrylic sleeve fixed at the head part of the model through glue.

As shown in figures 1 and 2, the novel air supply device for the load reduction model experiment comprises a high-pressure nitrogen cylinder 1, an air storage cylinder 2, a PU (polyurethane) hose 6, a pressure regulating valve 3, a flow valve 4, a flow meter 5 and an acrylic sleeve 8. The gas outlet of the high-pressure nitrogen cylinder 1 is connected with the gas inlet of the gas storage cylinder 2, and the gas outlet valve of the gas storage cylinder 2, the pressure regulating valve 3, the flow valve 4 and the flow meter 5 are sequentially connected through the PU hose 6. The free end of the PU hose 6 penetrates through the tail part of the experimental model 7 and is fixedly connected with the acrylic sleeve 8 through glue. The acrylic sleeve 8 is fixed on the experimental model head section 10 through a screw 9.

The high-pressure nitrogen gas cylinder 1, the gas storage cylinder 2, the pressure regulating valve 3, the flow valve 4, the flow meter 5 and the PU hose 6 are connected in sequence according to the above. The acrylic sleeve 8 is fixed on the model head section 10 by four M3 screws 9, and then the free end of the PU hose 6 passes through the tail part of the experimental model 7 and is glued in the inner hole of the acrylic sleeve 8. And finally, connecting the head section 10, the middle section and the tail end of the model. In the experimental process, the air outlet of the high-pressure nitrogen cylinder 1 is firstly opened, nitrogen is injected into the gas cylinder 2, and the inflation is stopped when the pressure reaches 1 Mpa. The gas outlet valve of the gas cylinder 2 is opened, and simultaneously the pressure regulating valve 3 is adjusted to obtain the preset pressure in the pipe. The flow valve 4 is then adjusted and the flow meter 5 reading is observed to obtain a predetermined in-line flow rate. And recording data such as pressure, flow and temperature, and the like, so that the air supply process under the preset pressure and flow is realized. And subsequently, the parameters can be changed by only adjusting the pressure regulating valve 3 and the flow valve 4 to carry out repeated experiments. The invention has ingenious design, solves the problem of air supply under the variable flow of the experimental model 7, and provides reliable air source guarantee for the smooth development of the novel load-reducing model experiment.

Claims

1. A load-reducing model experiment gas supply device is characterized by comprising a high-pressure nitrogen cylinder (1), a gas storage cylinder (2), a PU hose (6), a pressure regulating valve (3), a flow valve (4), a flowmeter (5) and an acrylic sleeve (8); the air outlet of the high-pressure nitrogen cylinder (1) is connected with the air inlet of the gas storage cylinder (2), and the air outlet valve of the gas storage cylinder (2), the pressure regulating valve (3), the flow valve (4) and the flow meter (5) are sequentially connected through a PU hose (6); the free end of the PU hose (6) penetrates through the tail part of the experimental model (7) and is fixedly connected with the acrylic sleeve (8) through glue; the acrylic sleeve (8) is fixed on the experimental model head section (10) through a screw (9).