A captive balloon limited wind speed static balance characteristic ground surface drag simulating test apparatus and method

Abstract

The invention brings forward a captive balloon limited wind speed static balance characteristic ground surface drag simulating test apparatus and method. A captive balloon scaled model and a dragging vehicle are comprised. Limited wind speed static balance characteristic analysis of a captive balloon is completed through a ground trailer dragging method. In the design of the test, according to the trailer performance, buoyancy, aerodynamic, gravity and other factors, a certain shrink ratio is set (the shrink ratio is not greater than 5: 1, far less than the wind tunnel test shrink ratio, closer to the real results), and the model after the scaling ensures a same shrink ratio between the outside force applied to the captive balloon and the moment of the captive balloon so as to guarantee that static balance characteristics can reflect the real captive balloon characteristics.

Description

technical field [0001] The invention belongs to the field of aerostat test and flight test. Specifically, it belongs to the technical field of static balance characteristic test of aerostats, and is applicable to the ground test technology of static balance characteristics of flexible body aerostats. Background technique [0002] The static balance characteristic test of the limit wind speed of the aerostat is an important means to test the performance of the aerostat. At present, there are mainly two test methods: the wind tunnel test and the free flight test in the real environment. [0003] Wind tunnel test technology: One of the main means of analyzing the static balance characteristics of the aircraft is based on the analysis of wind tunnel test data. However, due to the soft structure of large and medium-sized tethered balloons, the length can reach 50m or more, and the wind tunnel test It is necessary to scale the model, but after scaling, it is difficult to achieve ...

AI Technical Summary

Problems solved by technology

[0003] Wind tunnel test technology: One of the main means of analyzing the static balance characteristics of the aircraft is based on the analysis of wind tunnel test data. However, since the large and medium-sized tethered balloons are of soft structure and the length can reach 50m or more, the wind tunnel test It is necessary to carry out model scaling, but after scaling, it is difficult to achieve complete similarity in strength and stiffness of the model, and it is even more difficult to achieve similar buoyancy. After consulting relevant literature and patents, no similarity criteria or similarity criteria for wind tunnel tests of soft skin structures have been found. Therefore, the soft model wind tunnel test cannot be used to complete this work

[0004] Free flight test in real environment: The tethered balloon is moored on the ground through a tethered cable, without a power system, so it is difficult to directly conduct a free flight test under natural conditions; at the same time, the wind resistance of the tethered balloon can reach 40m / s, which is This kind of weather can not be met, so the free flight of the tethered balloon is difficult to simulate in the real environment

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