SU1281761A1 - Injector - Google Patents

Abstract

The invention relates to inkjet technology and allows an increase in the efficiency of the injector. By making the output diameter of the supersonic nozzle 2 larger than the diameter of the neck 5 i, l -1.7 times, the elastic flow of the flow against the walls of the confuser mixing chamber 4 is realized. In this case, a homogeneous structure of the two-phase flow is formed while maintaining the supersonic flow regime. Since a continuous passage through the speed of sound during deceleration is not possible in a constant section channel, a pressure jump occurs in the discharge pipe, for which the flow pressure may exceed the input pressure of steam and water. I il.

Description

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The invention relates to inkjet technology.

The purpose of the invention is to increase efficiency.

The drawing shows the injector, a general view.

The injector includes a housing 1, a central supersonic steam nozzle 2 located therein, an annular liquid nozzle 3 and a confusing chamber 4 mixing with throat 5. In the injector, the ratio of the output diameter D of the supersonic nozzle 2 to the diameter d of the neck 5 is 1.1 -1.7

The injector works as follows.

Working medium - steam enters the supersonic nozzle 2, where it accelerates to supersonic speed. The injected water is accelerated in the annular nozzle 3. In the confusor mixing chamber 4, steam is mixed with water, as a result of which the steam partially condenses and the velocity of the mixture exceeds the local sound velocity. Since the output diameter of the supersonic nozzle 2 is 1.1-1.7 times the diameter of the neck 5, an elastic impact of the flow on the walls of the mixing chamber 4 is realized and a homogeneous two-phase flow structure is formed while maintaining the supersonic flow regime. The resulting biphasic mixture enters the throat 5, and from there into the injection line. Since the continuous cross section channel is a continuous transition

Because the speed of sound during braking is not possible, a pressure jump occurs in the discharge pipe, after which the flow pressure can exceed the input pressures of steam and water. At the expense of this, water is pumped into a container with a pressure exceeding the inlet water pressure, for example, the boiler is fed with water with an initial atmospheric pressure.

The ratio of the output diameter of the supersonic nozzle 2 to the diameter of the neck 5, lying in the range 1.1 -1.7, was found experimentally. In this case, the efficiency of the injector is maximum. The ratio of these diameters greater than 1.7 leads to the disruption of the injector, the ratio of less than 1.1 leads

to an increase in dissipative losses associated with the predominance of viscous friction when mixing media.

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Claims (1)

Invention Formula The injector, comprising a housing, a central supersonic steam nozzle located therein, an annular liquid nozzle and a confusor mixing chamber with a throat, which is characterized in that, in order to increase efficiency, the ratio of the output diameter of the supersonic nozzle to the throat diameter is 1.1 -1 , 7.