RU2313774C2 - Turbulator and mode of turbulating a flow - Google Patents

Abstract

FIELD: the invention refers to experimental hydrodynamics and may be used for definition of the resistance of small objects to a running flow at tests.

SUBSTANCE: the arrangement is fulfilled in the shape of a grate with the width B_t. and the height h_t, deepened at the height T formed by rods with a step △ fixed in the supporting contour and is located at a certain distance in front of the tested object. At that it is installed with possibility of independent displacement relatively to the tested object and is fastened on the object and/or the body or probably on the bodies moving together with the tested object relatively to the test gondola. It is also may be formed by a system of private turbulators fulfilled in the shape of grates with a different size of cells, with possibility of their independent displacement relatively to each other including the fastening on different bodies and located primary in-series. The private turbulators may be fulfilled in the shape of grates particularly with different main direction of the rods of the grate. The mode is in locating the turbulator in front of the tested object with possibility of independent displacement relatively to the tested object and fastening on the object and/or on the body probably on the bodies moving together with the tested object particularly to test gondola. At that the position of the turbulator relatively to the tested object particularly the distance and displacement relatively to the tested object and also deepening and probably dimensions are chosen on the basis of comparison of results of the trial run of tarring of objects of different scales.

EFFECT: possibility of investigating of small models and revelation of the influence of resistance of the surface of the model.

6 cl, 3 dwg

Description

The invention relates to mechanical engineering, namely to determining the resistance to the incident flow of small models of objects during testing.

Known turbulators [1], which are a wire with a diameter of 1.0-1.5 mm, mounted on the surface of the hull model in the region of the first theoretical frame or pin in the form of cylinders with a diameter of 3 mm and a height of 2.5 mm. These turbulators do not allow the study of small-scale models and the influence of local hull resistances, for example, local defects in the hull in the form of corrugation of the outer skin.

The problem to which the invention is directed is the preliminary provision of turbulization of the flow running on the test sample.

The technical result achieved in this case is the possibility of studying small models and identifying the influence of local surface resistances of the model.

To achieve the indicated technical result, remote (relative to the test sample), in particular, lattice structures of turbulators, possibly with different main directions of the lattice, are used. Moreover, the turbulator can be formed as a system of private turbulators.

A turbulator (a system of turbulators) is placed in front of the test object at a certain distance, in the path of the incoming flow. Moreover, it can be fixed both on the test object itself, and separately and move from it at a certain (possibly variable) distance, while its depth can also change. As mechanisms for changing the distance, in particular, screw and chain feed mechanisms can be used. To determine the force exerted by the flow on the turbulator, it can be equipped with a dynamometer separate from the test object. When using a turbulator, as a system of sequentially located private turbulators, each of them can have an independent drive and a force recorder, can be mounted on different bodies, including several. In this case, private turbulators can have a mutually perpendicular main arrangement of the rods. The arrangement and movement of the turbulator (turbulizer system) and, possibly, overall dimensions are determined based on the results of running calibration objects of different scales.

Figure 1 shows a diagram of a test model of a ship’s hull with the turbulator mounted on a cart (handball) of the test pool; figure 2 is a test diagram of a model of the ship's hull with a turbulator mounted on the model; figure 3 is an option lattice remote turbulator with vertical slots (cells).

The experimental device consists (Fig. 1, 2) of a trolley 1, a towing wheel 2, a driven wheel 3, a test nacelle 4 of a dynamometer 5 of model 6, a knife 7, a sheath 8, a turbulator 9, equipped with a dynamometer 10 with an arm 11 and mechanisms for changing the distance to the investigated object, made, in particular, in the form of a screw feed 12, console 13. The turbulator 9 (Fig. 3) consists of a grating of width B _T , height h _T , deepened to a height T, formed by rods 13 with a pitch Δ fixed in the support circuit 14.

The turbulator operates as follows. The incoming flow, passing through the grate of the turbulator 9, is pre-turbulized, which allows you to escape from the laminar flow around the vast majority of the surface of the test object. When simulating the acceleration and deceleration of the test objects, it is possible to change the distance from the external turbulator to the test object using the feed mechanism 12. When mounting the turbulator 9 on the test object, the readings of dynamometer 10 (if the turbulator is not equipped with a dynamometer, it can be separately run with a sheath 7) is subtracted from dynamometer test object 5, and the result is the actual resistance value of the investigated object. It is intended to use a turbulator in the form of a system of sequentially located private turbulators with gratings of different geometries, in particular with different cells and / or the direction of the rods 1. The distance from the turbulator 9 to the test object 6 and the distance between the private turbulators are selected based on a comparison of the results of running calibration objects of different scales .

Information sources

1. Handbook of ship theory. In three volumes. Ed. Ya.I. Voytkunsky, Hydromechanics. Resistance to ship traffic. Ship movers. Volume One L .: Shipbuilding, 1895. - S.321-322.

Claims (6)

1. The turbulator, characterized in that it is made in the form of a lattice with a width B _T , a height h _T deepened to a height T, formed by rods with a pitch Δ fixed in the support loop, located in front of the test object with the possibility of independent movement relative to the test object and attached on the object and / or body, possibly bodies moving together with the test object, in particular the test gondola. 2. The turbulator according to claim 1, characterized in that it can be formed by a system of private turbulators, made in the form of gratings with different cell sizes, with the possibility of independent movement relative to each other, including by fixing on different bodies, and located mainly sequentially . 3. The turbulator according to claim 2, characterized in that the private turbulators are made in the form of gratings, in particular with different main directions of the grating rods. 4. The turbulator according to claim 3, characterized in that the private turbulizers arranged in series have a mutually perpendicular main direction of the rods. 5. A method of turbulent flow, characterized in that the turbulator is located in front of the test object with the possibility of independent movement relative to the test object and is mounted on the object and / or body, possibly bodies moving together with the test object, in particular to the test gondola. 6. The method according to claim 5, characterized in that the position of the turbulator relative to the test object, as well as the depth and, possibly, overall dimensions, are selected based on a comparison of the results of running calibration objects of different scales.

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