RU7145U1 - CAMERA OF A PULSING ENGINE OF DETONATION COMBUSTION - Google Patents

Abstract

A chamber of a pulsating detonation combustion engine, containing a supersonic nozzle located in the housing and coaxially located in the form of a tube facing the open end of the working fluid, characterized in that the supersonic nozzle is made integral: from the nozzle body, the conical part of which is active radiating half-wavelength overlay rigidly fixed to the device body in the nodal plane and from the inner casing fixed to the nozzle body and forming cooling with it conductive cavity.

Description

KJERA PULSING KNOWLEDGE-BURNING MOTOR ENGINE

The utility model relates to pulsating jet engines.

Known gas-jet generators Hartmann, operating in a pulsating mode of flow of the working fluid and are currently used as powerful acoustic emitters. With the discovery of the effect of increasing the temperature at the bottom of the resonator in a fraction of a second, they began to be used to ignite combustible fuel mixtures, and also when high-temperature heat sources were needed (Lyakhov V.N., Podlubny V.V., Titarenko V, V, Impact impact waves and jets on structural elements - M: Engineering, 1989, 392 p.). One of the options for the constructive embodiment of this effect is a ramjet engine according to the application of Germany No. 4139338, M. cl. F 02KI / 04 and F 02K7 / IO, 1982. It creates traction due to the pulsed (pulsating) regime of the expiration of the working fluid resulting from the combustion of the fuel-air mixture. This mode of operation is implemented in a resonant tube, creating a vacuum due to oscillations of the column of the working fluid, and air is supplied through annular slots. Despite the fact that this device has much in common with the claimed, it cannot realize the detonation mode of combustion

Closest to the claimed device, both in principle of operation and in technical design, is a camera of a pulsating detonation combustion engine (Positive decision of VNIIGPZ dated 18.04.96, according to

IPC F 02 K7 / 02

application No. 94031235/06 dated 20.08.94, a chamber of a pulsating detonation combustion engine), It contains a supersonic nozzle and a resonator located in a single housing, made in the form of a tube facing the open end of the working fluid. The disadvantage of this design is the relatively low reliability of detonation ignition of the working mixture, due to a slight intensification of the formation of shock waves.

The objective of the utility model is to reduce the diameter of the droplets of the working mixture supplied to the resonator and increase the rate of its outflow through the critical section.

This problem can be solved by giving one of the surfaces of the critical section of ultrasonic vibrations of a given frequency and amplitude.

The problem in the claimed device is achieved by the fact that the supersonic nozzle is made integral: from the nozzle body, the conical part of which is an active radiating half-wavelength overlay, is rigidly fixed to the device body in the nodal plane, and from the inner casing fixed to the nozzle body and forming with it cooling cavity.

The drawing shows a chamber of a pulsating detonation combustion engine, which consists of a housing I and a supersonic nozzle 2 and a resonator 3 located therein,

Case I is designed to install a supersonic nozzle 2 and a resonator 3, for communication of the cavity into the engine chambers with the environment and for supplying the components of the working mixture into the cavity and the mixing chamber.

resonator 2, as well as to disperse detonation products flowing out of the cavity of the resonator 3,

The resonator 3 is designed to create shock waves and the excitation of detonation combustion. It is made in the form of a tube of cylindrical (slightly conical) shape, closed at one end and facing the open end towards the nozzle.

A distinctive design feature is that the supersonic nozzle 2 is made integral: from the nozzle body 4, the conical part of which is an half-wavelength active radiating lining 5, rigidly fixed with the device body I in a nodular plane of the inner casing b, fixed with the nozzle body 4 and forming with it a cooling cavity d.

The engine chamber is tuned to a predetermined mode of its operation by changing the critical section area. This is achieved by selecting the thickness of the gasket installed between the flanges of the housing I and the supersonic nozzle 2, which are fastened together by bolts.

The camera is a pulsating detonation combustion engine as follows.

When the fuel components are fed into the mixing chamber a, a displacement process is carried out in it. The resulting working mixture from the displacement chamber through the critical section of the external expansion nozzle is fed into the resonator. At the same time, under the action of ultrasonic vibrations, additional droplet crushing occurs, since when the working mixture accelerates, the temperature drops, which can lead to its condensation. Thus, forced vibrations lead to a decrease in the diameter of the droplets of the working mixture.

. in the critical section, the working mixture reaches local (sound velocity (M I). As the flow area increases

parts of the speed of the working mixture grows slowly, exceeding the local speed of sound (M I). In this case, ultrasonic vibrations will cause an additional increase in the component of the flow rate of the working mixture.

After passing through the critical cross section, the working mixture acquires supersonic speed, accelerating along the central body of nozzle 2. A characteristic feature of the design is an external expansion nozzle, the mode of which does not depend on the ambient pressure, i.e. always running in steady state. This is because the pressure in the cavity is equal to the pressure of the environment due to communication with it through windows made in the housing.

Accelerated to a speed of G 2, the working mixture enters the internal cavity b of resonator I, in which an oscillatory process is excited with the formation of shock waves (Hartmann effect). In this case, there is a sharp increase in temperature and pressure (Springer effect), which leads to the occurrence of a detonation wave in the working mixture and its detonation combustion.

The resulting detonation wave, reflected from the bottom of the resonator 3 rushes to its exit, blocking the path of the incoming working mixture. When a detonation wave encounters a supersonic flow of a working mixture, it forms a shock wave, i.e. gas shutter, which blocks the path of the supersonic flow of the working mixture into the resonator 3. When the total pressure of the detonation products exceeds the total pressure of the working CMeci / i at the nozzle exit, the gas lock opens and the detonation wave rushes out through the cavity g.

Extended nozzle length helps maintain front

shock wave. In the future, the working mixture rushes B resonator 3 and the process is repeated again. The cooling of the active emitting lining 5 of the ultrasonic transducer is carried out by flowing coolant through the cavity

The traction force is created due to the interaction of the detonation wave with the bottom of the resonator 3 (traction wall), as well as due to the reactive force formed by the supersonic gas stream flowing through the nozzle. The total thrust pulse of a pulsating dB 1 detonation combustion detector is directly proportional to the pulsation frequency and the magnitude of the pressure acting on the bottom of the resonator.

Claims (1)

The chamber of a pulsating detonation combustion engine, containing a supersonic nozzle located in the housing and coaxially located in the form of a tube facing the open end of the working fluid, characterized in that the supersonic nozzle is made integral: from the nozzle body, the conical part of which is active radiating half-wavelength overlay rigidly fixed to the device body in the nodal plane and from the inner casing fixed to the nozzle body and forming cooling with it conductive cavity.