The method of controlling the combustion process in the chamber

 

(57) Abstract:

The invention can be used to control the combustion processes in a variety of devices pulsating and detonation combustion. The method of controlling the combustion process in the chamber effect on the degree of turbulence of the combustion front is that the impact is realized by the formation in the chamber of a diffuse electrical discharge, consistent with the hydrodynamic structure of the combustion front so that when the stabilization of the discharge current increases the degree of turbulence, and when stabilization of the discharge voltage decreases the degree of turbulence. The invention allows, depending on the objectives of the management processes of combustion in the chamber to slow down or speed up the movement of the waves of the combustion front. 6 Il.

The invention relates to power engineering and can be used to control the combustion processes in the cells, which is widely used in various devices pulsating and detonation combustion.

There are ways to control combustion by changing the parameters of turbulence, for example, the imposition of external fluctuations on the region combustion [1], the application of an additional tubular and of arc discharge, generated by the current source with an output impedance that is variable depending on the management tasks [3]. However, the ways of control of combustion processes by imposing external fluctuations in the area of combustion and a method of controlling the burning arc discharge is ineffective in the management of the processes occurring in the moving Samothrace wave of the combustion front. The first applies only to changes of parameters of turbulence, when the combustion front is localized to a limited area, for example on the burner device. Second, since the arc discharge may not move together with the combustion front as a result of its contrairement in cord plasma, ineffective in controlling combustion in combustion chambers. The methods associated with the use of additional mechanical turbulizer installed in channels, can only increase the degree of turbulence in the process, therefore, their options are limited. In addition, due to the statistical properties of the turbulence of the gas flow generated by additional mechanical turbulence promoters, the use of this control method gives significant statistical variation of the adjustable parameters.

The closest mechanism in which Wantnot [2] the combustion front additional turbulizer. The effect of exercise on the combustion front, and the whole environment in the chamber. This method has the disadvantages listed above.

The claimed invention solves the task of creating a method of controlling the combustion processes in the cell, allowing the control to slow down or speed up the movement of the waves of the combustion front.

The technical result that is achievable with the use of the claimed invention is the provision of an impact on the degree of turbulence of the combustion front with the possibility of increasing or reducing it, but you can affect the magnitude of the acoustic pressure in the combustion chamber, accelerating or slowing thereby the wave motion of the combustion front. In addition, the inventive method expands the range controls the combustion process in the chamber.

This technical result is achieved by the fact that when controlling the combustion process in the chamber effect on the degree of turbulence of the combustion front impact exercise formation in the chamber of a diffuse electrical discharge, consistent with the structure of the combustion front so that when the stabilization of the discharge current increases the degree of turbulence, and if the stabilizer is out, what in the combustion chamber excite diffuse electrical discharge, which is due to be consistent with the hydrodynamic structure of the combustion front moves together with the combustion front. The mechanism of influence on the degree of turbulence in the combustion front is as follows: at the initiation of stable current diffusion discharge AC dissipation associated with the discharge, lags in phase from phase AC heat associated with the combustion, and phase of the acoustic pressure, supported by chemical processes at an angle greater than /2. This leads to a decrease in the level of acoustic pressure in the channel and consequently to the decrease in the degree of turbulence in the combustion zone. The time of wave propagation of the combustion front is delayed. Upon excitation in the channel voltage stabilized diffuse discharge phase shift becomes less than /2, the acoustic pressure, on the contrary, increases, and increases the degree of turbulence in the combustion front, the wave propagation of the combustion front is accelerated.

The described method can be implemented using a device, scheme of which is shown in Fig. 1.

The device includes a closed one end of the pipe chamber 1 in wizetrade 2, between which excite diffuse discharge 8 from the power source 7 with the changing impedance. Two other sides of the rectangular pipes were made of non-conductive material, for example, made of organic glass. A combustible mixture is prepared dynamic way. Propane, air and supplemental oxygen is fed into the chamber through the mixer 3. Ignition of the combustible mixture is performed with a spark near the closed end 4 of the tube. Pressure register the piezoelectric pressure sensor 5 via the amplifier near the closed end of the tube. The speed of flame propagation was observed by two photomultipliers 6 through a window width of 1 mm, the output signal of the amplifier pressure sensor, photomultipliers and the power source received through the analog-to-digital Converter in the computer memory, where further processed.

The method is as follows. The combustible mixture is fed into the chamber 1 through the mixer 3, ignite the mixture with a spark near the closed end 4 of the tube. Simultaneously affect the turbulence of the flame front is stabilized current (less turbulence) or voltage (to increase the degree of turbulence) diffuse discharge 8, which moves the camera along with the MMA acoustic pressure, obtained using the sensor 5 and the waveform of the speed of flame propagation, obtained using photomultipliers.

Examples of specific performance of the method is demonstrated in Fig. 2-6.

The action of electrical discharges, stable current and voltage at the combustion zone proponowanych and propanedisulfonic mixtures in pipes, is different and depends essentially on the way to stabilize the electrical diffuse discharge and to some extent on the chemical composition of the mixture. In Fig. 2 shows waveforms of the pressure recorded when ignited by the spark proponowanych mixtures of different composition near the closed end of the tube when applying stable current discharge: a,b - the content of C3H8- 3,2%, g - 4,0%; and,without discharge; b,g - discharge in accordance with the claimed invention. As can be seen from the waveforms, the impact of stable current discharge most strongly for stoichiometric mixtures. The pressure is then decreased almost twice. More clearly the influence of electrical discharge as a result of the impact on the degree of turbulence of the combustion front occurs when registering the velocity of propagation of FM two photomultipliers. The results show that the rate of flame spread stoichiometric mixtures is reduced more than twice. Observe the effect of time delay for the acceleration of the flame front.

Predetonation length for proponowanych mixtures significantly greater than for propanedisulfonic. Therefore, to understand the effect of discharges on the characteristic predetonation processes controlling the combustion process in the chamber was carried out for mixtures enriched with oxygen when ignited at the closed end rough. In Fig. 3 shows the waveform of the pressure fluctuations for the stoichiometric papanikolatou mixture, diluted to 60% nitrogen: 3A - without discharge, 3b - discharge. As can be seen from the waveforms, the intensity of pressure fluctuations in the case of applying to the combustion zone stabilized current discharge (Fig. 3b) is reduced by 20%, but the rise time of the amplitude of pressure fluctuations but compared to the rise time without discharge increased almost twice, i.e. in vysokoenergetichnykh mixtures also is delaying predetonation period. The latter demonstrates the dependency relationship of the velocity of propagation of an accelerating flame front in stoichiometric preprovisioning by processing signals from the two photomultipliers (Fig. 4 is a plot of the ratio of average velocity of propagation of the flame with the discharge speed without discharge), located at a distance of 200 mm from each other and spaced from the closed end for a distance of 700 mm

It is seen that for the low-energy mixtures, the average propagation velocity accelerating flame front in electric discharge more than without discharge. With the increase of the percentage content of oxygen relative velocity is less than one, then there is also the effect of tightening predetonation processes.

To confirm the interaction, stable voltage discharge, consistent with the moving combustion front, measurements were taken to determine the rate of flame propagation along the pipe. Speed was determined using two photomultipliers located at a fixed distance of 0.1 m from each other and which as a whole is moved along the pipe axis. The graph of the velocity distribution shown in Fig. 5 (the dependence of the local velocity of flame propagation from the position of the flame front in the pipe for stoichiometric papanikolatou mixture, diluted to 72% nitrogen: 1 - no discharge, 2 - stable current razreda is an increase in the degree of turbulence of the flame front, therefore, the increase in the speed of the flame on the gross output of more than 30%. When approaching the velocity of propagation of the combustion wave to the speed of sound in the imposition of charges to the combustion zone stable current and voltage at different points of the transition area can both increase and reduce the local velocity distribution. Moreover, the General trend in reduction of turbulent burning speed (stable current discharge) or increase (voltage stabilized discharge) is saved.

The impact of discharges on the degree of turbulence in the combustion front is confirmed by studies on the visualization of the combustion zone at the initial stage of the impact of diffuse discharge. In Fig. 6 (fragments schlieren movie propagation of the combustion wave in a channel of rectangular cross-section and without rank, b - rank I = 10 mA) it is shown that the impact of the discharge (Fig. 6b), stable current, the degree of turbulence in the combustion zone in the channel is reduced compared to the case with flame spread without discharge (Fig. 6A).

These examples show that using diffuse discharges can be controlled by combustion processes for initiating detonation in channels, and the impact of the OS is

1. Inventor's certificate SU 556281, CL F 23 N 5/00, 1977.

2. Inventor's certificate SU 1244423, CL F 23 C 11/04, F 23 R 7/00, 1986.

3. Inventor's certificate SU 270666, class B 061/20, 1987.

The method of controlling the combustion process in the chamber effect on the degree of turbulence of the combustion front, characterized in that the exposure is performed by forming in the chamber of a diffuse electrical discharge, consistent with the hydrodynamic structure of the combustion front so that when the stabilization of the discharge current increases the degree of turbulence, and by the stabilization of discharge in the direction of decrease the degree of turbulence.

 

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