RU182895U1 - DEVICE FOR MANAGING THE STREAM DISCHARGE - Google Patents

Abstract

The utility model relates to the field of aerodynamics, namely to devices for controlling airflow separation, and can be mainly used in the field of shipbuilding to reduce the size of the separation zone on the roofs of superstructures of various types of vessels, in order to reduce smokiness, and to provide habitable conditions. is the creation of such a design of the architectural form of the superstructure, which allows to reduce the separation zone on the roof of the superstructure, which significantly reduces ymlyaemost superstructure sudna.Tehnichesky result is achieved as follows. A device for controlling flow separation comprises a superstructure of the vessel. The superstructure of the vessel is made in the form of a ledge, the ratio of the geometric parameters of the ledge is in the range 0.2≤h / b≤0.5, where h is the height of the ledge, b is the width of the ledge, provided that the exhaust casing is located behind the superstructure of the vessel.

Description

The utility model relates to the field of aerodynamics, and in particular to devices for controlling airflow separation and can be mainly used in the field of shipbuilding to reduce the size of the separation zone on the roofs of superstructures of various types of vessels, in order to reduce smokiness, and to ensure habitable conditions.

A model of the vessel, made to study the flow structure in a hydrodynamic pipe, allows you to simulate the flow around the fluid of the investigated object. The superstructure of the vessel creates separation zones with reduced pressure, into which it is possible for exhaust gases to escape from the pipe, therefore it is necessary to control the dimensions of the separation zone.

A device is known for reducing the separation zone on the superstructure of a ship, designed to reduce the smoke of superstructures of ships (utility model patent No. 173255). The disadvantage of this solution is the exposure to smoke at certain angles of leakage of air flow.

A device for reducing aerodynamic drag in the structures of trucks is known (article BC Karabtsev, D.Kh. Valeev, "Aerodynamics of poorly streamlined bodies and the possibilities of its application in the design of trucks. Analytical review"; journal "Mechanics of Machines, Mechanisms and Materials". 2011, No. 4 (17)). The results of studies to determine the geometric parameters of the stepped shape of the body on the drag coefficient are presented. The disadvantage of this solution is the limited scope.

The closest technical solution was not found.

The technical result of the utility model is the creation of such a design of the architectural form of the superstructure, which allows to reduce the separation zone on the upper part of the superstructure, which significantly reduces the smokiness of the superstructure of the vessel.

The technical result is achieved as follows. A device for controlling flow separation, contains a superstructure of the vessel. The superstructure of the vessel is made in the form of a ledge, the ratio of the geometric parameters of the ledge is in the range 0.2≤h / b≤0.5, where h is the height of the ledge, b is the width of the ledge, provided that the exhaust casing is located behind the superstructure of the vessel.

The ratio of the geometric parameters of the step is determined as a result of aerodynamic or hydrodynamic experiments or by numerical methods.

The ratio of the geometric parameters of the ledge is in the range

0.2≤h / b≤0.5, where h is the height of the ledge, b is the width of the ledge.

The essence of the utility model is illustrated by drawings, where:

in FIG. 1 shows a diagram of a general view of a superstructure without the use of a ledge;

in FIG. 2 shows a diagram of a general view of a superstructure with a ledge in an experimental model;

in FIG. Figure 3 shows the visualization of the flow around the model of the stern superstructure of the vessel, where the upper cut of the exhaust pipe casing is located below the upper boundary of the separation zone;

in FIG. Figure 4 presents the visualization of the flow around the stern superstructure of the vessel, where the upper cut of the exhaust pipe casing is located above the upper boundary of the separation zone.

The device consists of a ledge in the zone of formation of separation of the air flow, subject to the location of the exhaust casing behind the superstructure of the vessel.

The device operates as follows. Given the location of the exhaust pipe casing behind the superstructure of the vessel due to the ledge, the incoming air flow is pressed to the top of the superstructure, as a result of which the height of separation of the flow from the leading edge of the superstructure of the vessel decreases.

The conducted experiment in a hydrodynamic tube using the hydrogen bubble method allows one to estimate the size of the flow separation region.

An intrinsic vortex flow arises inside the ledge zone, which presses the limit line of the main flow to the upper part of the superstructure, due to a decrease in the vertical component of the velocity of the main flow in the region of the separation point. If the chimney section behind the superstructure is below the upper boundary of the separation zone (Fig. 3), then the flue gases will propagate towards the main air flow rushing onto the ship. In this case, the smoke will fill the entire separation zone on the upper tier of the superstructure. If the transverse size of the separation zone is reduced (Fig. 4) by so much that the pipe section crosses the upper boundary of the separation zone, and the gases leaving the pipe will be carried by the external flow into the stern of the vessel, then there will be no smoke on the superstructure of the vessel.

Most of the superstructures located on the upper deck of the vessels are surrounded by air flow with a separation at various drift angles relative to the apparent wind (taking into account the speed of the ship). The distribution of speeds and pressures in the separation zones significantly affects the spread of smoke over the surface of the vessel and the behavior of aircraft when moving near the surface of the vessel. With regard to smoke, there are problems of visibility, ventilation of the premises, including the provision of clean air to the propulsion system of the vessel, problems of failure of the engines of aircraft when sampling the exhaust gases of the ship installation.

One of the essential parameters is the transverse size of the separation zone and its relation to the velocity of the unperturbed incident flow.

This technical solution allows you to control the separation of the flow from the front horizontal edge of the superstructure of the vessel, reducing the height of the separation zone, in order to reduce the smoke of the superstructure of the vessel while reducing the height of the casing of the flues.

Claims (1)

A device for controlling the separation of the stream containing the superstructure of the vessel, characterized in that the structure of the superstructure of the vessel is made in the form of a ledge, the ratio of the geometric parameters of the ledge is in the range 0.2≤h / b≤0.5, where h is the height of the ledge, b is the width ledge, subject to the location of the exhaust casing behind the superstructure of the vessel.

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