Method of air flows formation with increased kinetic component of braking enthalpy

Abstract

FIELD: gas industry.SUBSTANCE: invention relates to power machines, namely to methods of gas flows energy conversion. For highly efficient and low-cost formation of large-scale air flows with increased speed, a wave rotor is used, into which from combustion chamber 4 a supersonic flow of combustion products 5 accelerated in a de Laval nozzle 3 is supplied. Air acceleration in shock wave is intensified at flow expansion both in channels of rotor 1 and in outlet unit 8 in the form of diffuser. Additional air acceleration takes place due to ejection into formed zones of reduced pressure through convergent inlet assembly.EFFECT: highly effective and low-cost generation of large-scale powerful air flows with increased speed.6 cl, 4 dwg

Description

[0001] Field of technology to which the invention relates

[0002] The invention relates to energy machines, namely to methods for converting the energy of gas flows, more precisely to the formation of air flows with an increased kinetic component of the braking enthalpy, used, among other things, in wind tunnels.

[0003] High-speed air flows are used for various purposes, for example, for testing and studying the aerodynamic properties of buildings and structures, cars, aircraft, etc. (see, for example, [Nazarov, D.V. Experimental Aerodynamics: [textbook]. - Electronic text / D.V. Nazarov, A.N. Nikitin, E.N. Tarasova; Ministry of Science and Higher Education of the Russian Federation, Samara National Research University named after S.P. Korolev (Samara University). - Samara: Publishing house of Samara University, 2020. - 1 file (3.50 MB). - ISBN=978-5-7883-1497-6]; for displacing media, for example, to eliminate smoke and supply air when smoke is present; to ensure reactions involving air, etc. (see, for example, [Sherstyuk A.N. Pumps, fans and compressors. Textbook for technical colleges. Moscow: Higher School. 1972. 344 p.]). For this purpose, using a power machine for a flow of atmospheric air with a flow rate of m', the stagnation enthalpy of the mass element is increased

[0004]

[0005] so that a significant part of it is made up of kinetic energy associated with the last term (1), here u is the specific internal energy, p is the pressure, ρ is the density, v is the air flow velocity (as is known, the stagnation enthalpy is a value convenient for describing the energy of gas flows with an insignificant role of dissipative processes).

[0006] There are various known methods for creating powerful air currents with increased speed and kinetic energy.

[0007] Thus, in research wind tunnels, durable vessels of large total volume are often used - gas holders, into which air is pumped until high pressure is reached, and during the experiment, the air is released through the nozzle of the wind tunnel.

[0008] In some cases, air flows are created by powerful electric blade machines (fans, compressors), which requires a large installed electrical power; this is not always possible.

[0009] Turbojet engines, which are highly technically complex and expensive, are also used to drive blade machines.

[0010] To conduct tests in wind tunnels, as a rule, a few seconds or even less than a second of operation is sufficient to establish quasi-stationary flow regimes and measure all the parameters of interest using well-developed modern miniature sensors and automatic diagnostic systems [Zatoloka V.V. Pulsed Wind Tunnels. Novosibirsk: Nauka, 1986. 142 p.]. At the same time, many wind tunnels, due to their design, create air flows for tens to hundreds of seconds or more, which, given large transverse flow scales, corresponds to excessively high energy costs.

[0011] As a result, existing wind tunnels are bulky (often occupying entire buildings), technically complex, and expensive to build, maintain, and conduct experiments. Following the cutbacks of recent decades, operational wind tunnels are relatively few in number, yet experiments in them are increasingly in demand.

[0012] Therefore, the task of generating powerful, short-term air flows with increased kinetic energy using relatively small devices is relevant.

[0013] High values ​​of both specific and total stagnation enthalpy are achieved using powerful, relatively small, and inexpensive combustion chambers of various types. They can briefly generate large flows of high-enthalpy combustion products, including those with an increased kinetic component of stagnation enthalpy, for which, in particular, acceleration in a Laval nozzle is used. However, the temperature level and chemical composition of the generated flows differ significantly from air under normal conditions.

[0014] A known method for increasing the stagnation enthalpy of air by transferring it from combustion products, in which rotor channels (during rotation of the so-called wave rotor) with cold dense air are fed into the path of the combustion product flow in the direction transverse to it [Seippel C. US 2399394 1946-04-30; Pezhman Akbari, Razi Nalim, Norbert Mueller. A Review of Wave Rotor Technology and Its Applications / / Journal of Engineering for Gas Turbines and Power. 2006, Vol.128 Pp. 717-735 and others]. The rotor channels can have a fixed or connected to the rotor upper wall, the air inlet and outlet can be from one end of the rotor or from opposite ends, the inlet and outlet of combustion products can also be from one end of the rotor or from opposite ends. The transfer of the braking enthalpy of the exhaust gases to the cold dense air in the channel is achieved by organizing its compression and heating when high-pressure gases enter the channel.In this case, the enthalpy of air braking increases mainly in terms of the first two terms associated with the internal energy and air pressure.

[0015] However, [CN 115013153, Wave rotor system with convergent channels, 2022] proposes increasing the kinetic component of the braking enthalpy by forming the air and combustion product inlet on one flat end of the rotor and the outlet on the other, and making the rotor channels narrower in the direction of the air and combustion product flows. Indeed, as is known, in a quasi-steady subsonic flow, the air in a narrowing channel accelerates, and part of the braking enthalpy is converted into its kinetic component. This invention is closest to the claimed one both in its purpose (the formation of powerful air flows with an increased kinetic component of the air braking enthalpy) and in the method and means for achieving it (the transfer of braking enthalpy from the combustion products in a wave rotor); it is accepted as a prototype.

[0016] Fig. 1 shows a section and an axonometric projection of a wave rotor with the end removed according to [CN 115013153].

[0017] The rotor rotates on a bearing 70. The channels of the rotor 30 are formed by the walls of the inner drum 31, the outer wall 32 and the partitions, which are radially arranged flat plates, fastened together.

[0018] Fig. 2 shows two projections of the inlet (a, b) and two projections of the outlet (c, d) part of the wave rotor [CN 115013153] with the inlet and outlet units for air and combustion products.

[0019] According to [CN 115013153], each air and combustion product inlet and outlet unit is a beveled quadrangular pipe, where 11, 12, 61, 62 are cylindrical walls, 13, 14, 63, 64 are flat walls, 2 and 5 are the inlet and outlet end flange of the wave rotor; it is obvious that the cross-section of each of these pipes is constant in the direction of flow of the medium.

[0020] Thus, the prototype describes a method for generating air flows with an increased kinetic component of the braking enthalpy, in which:

[0021] • Form N≥2 (usually more than 10) rotor channels located symmetrically relative to the z-axis, with each rotor channel having one input end with the coordinate of the center of gravity of the input section z=z i , and the other end of the outlet with the coordinate of the center of gravity of the outlet section z=z f , z i <z f ;

[0022] • Form the following, which are stationary relative to each other: a combustion product inlet unit, gas-dynamically connected to the combustion chamber; an air inlet unit, gas-dynamically connected to the external atmosphere; an air outlet unit; a combustion product outlet unit,

[0023] • Rotate the rotor channels around the z axis in the direction of +ϕ, where (r,ϕ,z) are cylindrical coordinates, and during rotation for each of the rotor channels sequentially:

[0024] is fed into the specified channel of the rotor with air with the braking enthalpy of the mass element h Amin combustion products with stagnation enthalpy of mass element h Pmax, for which a gas-dynamic connection is established between the input end of the said rotor channel and one of the combustion product input units,

[0025] organize the transfer of part of the enthalpy of braking of combustion products to air in the specified rotor channel, for which purpose at least one zone of increased air pressure is formed in the volume of the rotor channel by means of the displacing action of the flow of combustion products;

[0026] air with the braking enthalpy of the mass element h is removed from the specified rotor channel Amax , exceeding the initial h Amin , for which a gas-dynamic connection is established between the outlet end of the said rotor channel and one of the air outlet units,

[0027] after the termination of the gas-dynamic connection between the said combustion product inlet unit and the said rotor channel, a low-pressure zone is formed, located in a part of the volume of the said rotor channel at its inlet and in the adjacent volume of the air inlet unit,

[0028] air is supplied to the specified rotor channel under the influence of a low-pressure zone, for which a gas-dynamic connection is established between the inlet end of the rotor channel and one of the air inlet units, with the braking enthalpy of the mass element h Amin ,

[0029] combustion products with the braking enthalpy of the mass element h are removed from the specified rotor channel Pmin <h Pmax , for which a gas-dynamic connection is established between the outlet end of the specified rotor channel and one of the combustion product outlet units.

[0030] However, it can be shown that there are possibilities for increasing the kinetic component of the stagnation enthalpy that are not used in the prototype.

[0031] Indeed, the law of conservation of momentum implies that both the momentum of the combustion products and the momentum transferred to the air (as well as the kinetic energy acquired by the air) for a given flow rate m' are higher at higher combustion product flow speeds. Therefore, to increase the velocity of the combustion products formed in the combustion chamber to supersonic values, it is advisable to install a Laval nozzle at the combustion chamber outlet, directing the supersonic flow of combustion products to the rotor channel inlets.

[0032] Combustion chamber operation involves complex chemical and gas-dynamic processes, and significant rapid pressure changes at the rotor channel inlets during their movement can lead to undesirable and even catastrophic processes. However, this pressure change does not propagate upstream in the supersonic combustion product flow. This further supports the feasibility of using a Laval nozzle and generating a supersonic combustion product flow.

[0033] Another argument in favor of using a supersonic combustion product flow is the dramatically reduced requirements for clearances between the combustion product inlet unit and the rotor channel entrances, which prevent combustion product spreading away from the z-direction. The static pressure in a supersonic flow is lower than the pressure in the combustion chamber, and the average pressure drop across these clearances can be reduced to zero by carefully selecting the shape and size of the Laval nozzle. This reduces the manufacturing precision requirements and the cost of creating the wave rotor and combustion product inlet units.

[0034] When air is exposed to a flow with a high (relative to air pressure) velocity pressure proportional to m'v, at least one shock wave is generated in the air. The operating processes and patterns of stagnation enthalpy transfer in this case differ significantly from those for quasi-steady subsonic flows in a channel, even if the average air velocity is subsonic. This is evidenced, for example, by the results of our computational experiments (Fig. 3). Significantly, the dependence of the average air velocity on the change in the channel cross-sectional area is the opposite of that characteristic of quasi-steady subsonic flows: calculations showed that the kinetic component of the air flow enthalpy increases in an expanding channel, rather than in a narrowing one.This is most obvious when applying the law of conservation of momentum: the change in airflow momentum per unit time, m'⋅v, in a variable-cross-section duct occurs due to the resultant force of increased pressure on the air walls behind the shock wave. This resultant force increases m'⋅v only as the duct expands, since the pressure forces are normal to the duct walls. In the prototype, the rotor ducts narrow as z increases, meaning the aforementioned mechanism for increasing the kinetic component of braking enthalpy does not operate.

[0035] After the gas-dynamic connection between the inlet of this channel and the combustion product flow exiting the Laval nozzle ceases, a low-pressure zone forms behind the high-pressure zone, located in the adjacent parts of the volume of the air inlet unit and this channel (see Fig. 3). Similar to the action of the high-pressure zone, the low-pressure zone can be used for more effective air acceleration through ejection if the air inlet unit is formed as a channel such that its cross-sectional area decreases with increasing z.

[0036] Furthermore, the shock wave in the air and the high-pressure region behind it move forward from the boundary with the combustion products, and upon exiting the rotor channel, the conversion of the air's stagnation enthalpy into kinetic energy becomes ineffective. To utilize this stagnation enthalpy after the air exits the rotor, an outlet unit in the form of an expanding channel can also be used. In this channel, the above-described processes of increasing the kinetic energy of the air's stagnation enthalpy continue, increasing the efficiency of air acceleration. In the prototype, the outlet device is shaped like a channel of constant cross-section, and this additional air acceleration does not occur.

[0037] Thus, the prototype does not fully utilize the potential for increasing the kinetic component of braking enthalpy. This is a drawback of the prototype.

[0038] The aim of the proposed invention is the efficient formation of powerful air flows with an increased kinetic component of the braking enthalpy using autonomous, relatively technically simple devices.

[0039] The essence of the proposed invention lies in a method for forming air flows with an increased kinetic component of the braking enthalpy, in which, as in the prototype:

[0040] • Form N≥2 rotor channels located symmetrically relative to the z-axis, wherein each rotor channel has one input end with the coordinate of the center of gravity of the input section z=z i, and the other end of the outlet with the coordinate of the center of gravity of the outlet section z=z f , z i <z f ;

[0041] • Form motionless relative to each other: S≥1 (in the prototype S=1) combustion product inlet nodes, gas-dynamically connected with at least one combustion chamber, where S <N; S узлов входа воздуха, газодинамически связанных с внешней атмосферой; S узлов выхода воздуха; S узлов выхода продуктов сгорания,

[0042] • Rotate the rotor channels around the z axis in the direction of increasing ϕ, where (r,ϕ,z) are cylindrical coordinates, and during rotation for each of the rotor channels sequentially:

[0043] is fed into the specified channel of the rotor filled with air with the braking enthalpy of the mass element h Amin , combustion products with the stagnation enthalpy of the mass element h Pmax , for which a gas-dynamic connection is established between the input end of the said rotor channel and one of the combustion product input units,

[0044] organize the transfer of part of the enthalpy of braking of combustion products to air in the specified rotor channel, for which purpose at least one zone of increased air pressure is formed in the volume of the rotor channel by means of the displacing action of the flow of combustion products;

[0045] air with the braking enthalpy of the mass element h is removed from the specified rotor channel Amax , exceeding h Amin , for which a gas-dynamic connection is established between the outlet end of the said rotor channel and one of the air outlet units,

[0046] form, after the termination of the gas-dynamic connection between the said combustion product inlet unit and the said rotor channel, a low-pressure zone located in a portion of the volume of the said rotor channel at its inlet and in the adjacent volume of the air inlet unit,

[0047] air is supplied to the specified rotor channel under the influence of a low-pressure zone, for which a gas-dynamic connection is established between the inlet end of the rotor channel and one of the air inlet units, with the braking enthalpy of the mass element h Amin ,

[0048] combustion products with the braking enthalpy of the mass element h are removed from the specified rotor channel Pmin <hp max , for which a gas-dynamic connection is established between the outlet end of the specified rotor channel and one of the combustion product outlet units.

[0049] However, unlike the prototype, in order to use the above-described possibilities of additionally increasing the kinetic component of the enthalpy of braking of air flows,

[0050] a supersonic flow of combustion products is fed to the entrance of the rotor channel, for which purpose each of the combustion product inlet units is formed in the form of a Laval nozzle,

[0051] each of the rotor channels is formed so that its cross-sectional area increases with the increase of the z-coordinate of the center of gravity of the section,

[0052] Each of the combustion product outlet nodes is formed as a channel such that its cross-sectional area increases with increasing z-coordinate of the cross-section's center of gravity. Periodic changes in gas-dynamic structures during interaction between high-pressure air and the walls can cause periodic changes in transverse forces relative to z, inducing unwanted oscillations. To reduce transverse oscillations, S≥2 is selected, N=n⋅S, n is an integer, and the air inlet nodes are symmetrical relative to the z-axis, the combustion product inlet nodes are symmetrical relative to the z-axis, the air outlet nodes are symmetrical relative to the z-axis, and the combustion product outlet nodes are symmetrical relative to the z-axis. Oscillation reduction is achieved by ensuring symmetry of the force acting on the device.

[0053] It is possible to ensure a more efficient transfer of a portion of the enthalpy of combustion product braking to the air in each of the air inlet units by accelerating the air under the action of said low pressure zone, for which purpose said air inlet unit is formed in such a way that the area of ​​its cross-section, normal to z, does not increase with an increase in the z-coordinate of the center of gravity of the cross-section and, at least in part of the air inlet unit, decreases.

[0054] The highest value of the kinetic component of the airflow stagnation enthalpy for a given set of gas-dynamic parameter values ​​at the air inlet, combustion product inlet, air outlet, and combustion product outlet nodes corresponds to the optimal rotor speed f. This speed can be achieved by harnessing the energy of the flows under the action of the dynamic pressure of the combustion products and air in the rotor channel. To achieve this, at least part of each rotor channel is shaped such that the angular coordinate ϕ of the cross-section's center of gravity decreases with increasing z. Rotation at optimal speed is achieved when the rotational acceleration due to flow around inclined surfaces, on the one hand, and braking in the bearings and air friction, on the other, are equal.

[0055] When changing the set of gas-dynamic parameters at the air inlet, combustion product inlet, air outlet, and combustion product outlet nodes, the optimal frequency f also changes. In this case, it is possible to ensure the highest value of the kinetic component of the airflow stagnation enthalpy by measuring the values ​​of at least some of these parameters, calculating the optimal rotor speed f, and ensuring the implementation of the changing optimal rotor speed f using a controlled rotor drive.

[0056] With a changing set of values ​​of gas-dynamic parameters in the units of the air inlet, combustion product inlet, air outlet and combustion product outlet, it is also possible to ensure the highest value of the kinetic component of the enthalpy of air flow braking while saving the power of the controlled rotor drive, for which purpose an optimal rotor rotation frequency f, average over the specified sets, is provided under the action of the dynamic pressure of the combustion products and air in the rotor channel, for which purpose at least a part of each rotor channel is formed so that with an increase in z the angular coordinate ϕ of the center of gravity of the section decreases, while the main energy costs are realized for ensuring rotation;the values ​​of at least a portion of the gas-dynamic parameters of the air are measured in the air inlet, combustion product inlet, air outlet, and combustion product outlet units, the optimal rotor speed f is calculated, and the variable optimal rotor speed f is ensured using a controlled rotor drive, with energy costs being lower than in the previous case.

[0057] The essence of the proposed invention is explained in Fig. 3, 4.

[0058] Fig. 3 shows some results of our computational experiments on work processes in accordance with the presented invention.

[0059] Fig. 4 shows sketches of several stages of the cycle in the implementation of the presented invention.

[0060] Fig. 3 shows the spatial distributions of pressure p (Pa), temperature T (K) and velocity v (m / s) when interacting with air at a temperature of 300 K, a pressure of 10 5Pa of combustion products with a Λ-shaped flow rate time dependence (total injection time 0.834 ms, maximum flow rate 0.03 kg / s) at 0.69 ms after the start of gas injection with an initial temperature of 1650 K, a molecular weight of 17.5 u.a.m.u., an adiabatic index of 1.3 in a 0.275 m long channel with a critical cross-section of 1.6 mm in diameter. A supersonic flow with several characteristic acceleration and deceleration zones is formed in the Laval nozzle. The supersonic flow regime leads to the absence of undesirable feedback on the processes in the engine. It follows from the temperature distribution that the combustion product piston has reached approximately 35...40% of the channel length; this is the appropriate length to choose for the rotor channels, and the remaining part of the channel volume is located in the air outlet unit. A region of high pressure is visible in the channel in the volume behind the shock wave, occupied mainly by cold dense air, and a region of low pressure in the volume remote from the shock wave.Almost all of the combustion product momentum is transferred to the air. Increased pressure on the expanding walls results in an approximately twofold increase in the air flow momentum compared to walls parallel to the z-axis.

[0061] Fig. 4 illustrates the possibility of implementing the proposed method using one of the possible variants as an example, which, however, does not limit the scope of the invention defined by the claims. Fig. 4 shows the successive stages of the working process for one of the rotor channels (marked with an asterisk): a, b, c - the stage of filling the rotor channel with air and the outlet of combustion products; g, d, e - the initial stage of establishing the gas-dynamic connection of the rotor channel with the Laval nozzle; g, i, j - complete gas-dynamic connection of the rotor channel with the Laval nozzle, and the outlet of air with increased kinetic energy. Left row (a, g, g) - front view (z=const) with the air and combustion products outlet units removed; middle row (b, d, i) - longitudinal section ϕ=const; right row (c, e, j) - section in the azimuthal surface z=const.Here 1 is the radial wall of the rotor channel, 2 is the air inlet, 3 is the combustion product inlet in the form of a Laval nozzle, 4 is the combustion chamber, 5 are the combustion products, 6 is the combustion product outlet unit, 7 is the air inlet unit, 8 is the air outlet unit. Rotation is indicated by dashed arrows.

[0062] The technical result of the proposed method, which combines a set of effects on the air flow, is a highly efficient and low-cost formation of large-scale, powerful air flows with increased speed.

Claims

1. A method for generating air flows with an increased kinetic component of the braking enthalpy, in which: form N>2 rotor channels located symmetrically relative to the z-axis, with each rotor channel having one input end with the coordinate of the center of gravity of the input section z=z i and the other end of the outlet with the coordinate of the center of gravity of the outlet section z=z f , z i <z f ; form S≥1 combustion product entry nodes that are stationary relative to each other and gas-dynamically connected to at least one combustion chamber, where S <N; S узлов входа воздуха, газодинамически связанных с внешней атмосферой; S узлов выхода воздуха; S узлов выхода продуктов сгорания, rotate the rotor channels around the z axis in the direction of increasing ϕ, where (r, ϕ, z) are cylindrical coordinates, and during rotation for each of the rotor channels sequentially: is fed into the specified channel of the rotor filled with air with the braking enthalpy of the mass element h Amin , combustion products with the stagnation enthalpy of the mass element h Pmax , for which a gas-dynamic connection is established between the input end of the said rotor channel and one of the combustion product input units, organize the transfer of part of the enthalpy of braking of combustion products to air in the specified rotor channel, for which purpose at least one zone of increased air pressure is formed in the volume of the rotor channel by means of the displacing action of the flow of combustion products; air with the braking enthalpy of the mass element h is removed from the specified rotor channel Amax , exceeding h Amin , for which a gas-dynamic connection is established between the outlet end of the said rotor channel and one of the air outlet units, form, after the termination of the gas-dynamic connection between the said combustion product inlet unit and the said rotor channel, a low-pressure zone located in a portion of the volume of the said rotor channel at its inlet and in the adjacent volume of the air inlet unit, air is supplied to the specified rotor channel under the influence of a low-pressure zone, for which a gas-dynamic connection is established between the inlet end of the rotor channel and one of the air inlet units, with the enthalpy of braking of the mass element, combustion products with the braking enthalpy of the mass element h are removed from the specified rotor channel Pmin <h Pmax , for which a gas-dynamic connection is established between the outlet end of the said rotor channel and one of the combustion product outlet units, characterized in that: a supersonic flow of combustion products is fed to the entrance of the rotor channel, for which purpose each of the combustion product inlet units is formed in the form of a Laval nozzle, each of the rotor channels is formed so that its cross-sectional area increases with the increase of the z-coordinate of the center of gravity of the section, Each of the combustion product outlet nodes is formed in the form of a channel such that its cross-sectional area increases with an increase in the z-coordinate of the center of gravity of the section.

2. The method according to paragraph 1, characterized in that it ensures a reduction in transverse vibrations relative to z, arising from the interaction of high-pressure air and the walls, for which S≥2, N=n⋅S, n is an integer, are selected, wherein the air inlet nodes are symmetrical relative to the z-axis, and the combustion product inlet nodes are symmetrical relative to the z-axis, and the air outlet nodes are symmetrical relative to the z-axis, and the combustion product outlet nodes are symmetrical relative to the z-axis.

3. The method according to paragraph 1, characterized in that a more efficient transfer of a portion of the enthalpy of deceleration of combustion products to air is organized in each of the air inlet units due to the acceleration of air under the action of the said low-pressure zone, for which purpose the said air inlet unit is formed in such a way that the area of ​​its cross-section, normal to z, does not increase with an increase in the z-coordinate of the center of gravity of the cross-section and decreases at least in part of the air inlet unit.

4. The method according to claim 1, characterized in that the greatest value of the kinetic component of the enthalpy of braking of the air flow is provided for one set of values ​​of the gas-dynamic parameters in the air inlet, combustion product inlet, air outlet, and combustion product outlet units, providing the optimal rotor speed f under the action of the velocity pressure of the combustion products and air in the rotor channel, for which at least part of each rotor channel is formed so that with an increase in z, the angular coordinate q>of the center of gravity of the section decreases.

5. The method according to claim 1, characterized in that the greatest value of the kinetic component of the enthalpy of braking of the air flow is ensured with a changing set of gas-dynamic parameters in the units of the air inlet, combustion product inlet, air outlet, and combustion product outlet, for which purpose the values ​​of at least part of the said parameters are measured, the optimal rotor speed f is calculated, and the implementation of the changing optimal rotor speed f is ensured with the help of a controlled rotor drive.

6. The method according to claim 1, characterized in that the greatest value of the kinetic component of the enthalpy of braking of the air flow and savings in the mass and dimensions of the controlled rotor drive are ensured with a changing set of values ​​of the gas-dynamic parameters in the air inlet, combustion product inlet, air outlet, and combustion product outlet units, for which purpose an optimal rotor rotation frequency f, average over said sets, is ensured under the action of the dynamic pressure of the combustion products and air in the rotor channel, for which purpose at least a part of each rotor channel is formed so that with an increase in z the angular coordinate ϕ of the center of gravity of the section decreases; the values ​​of at least a part of the gas-dynamic parameters of the air in the air inlet, combustion product inlet, air outlet, and combustion product outlet units are measured, the optimal rotor rotation frequency f is calculated, and the implementation of the changing optimal rotor rotation frequency f is ensured with the help of the controlled rotor drive.

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