138 results about "Thermoacoustics" patented technology

The invention relates to the technical field of aerospace, and particularly provides a liquid metal closed-loop thermal management system and method for a hypersonic aircraft. The system comprises a liquid metal circulation loop which comprises a liquid metal pump used for driving a liquid metal working medium to circularly flow; the heat absorption device is integrated in the liquid metal circulation loop and used for receiving operation heat of the hypersonic flight vehicle and transmitting the operation heat to the liquid metal working medium flowing through the hypersonic flight vehicle. The thermo-acoustic power generation device at least comprises a hot end heat exchanger connected to the heat absorption downstream of the liquid metal circulation loop in series and used for converting part of heat energy of the liquid metal working medium heated after heat absorption into electric energy so as to drive a liquid metal pump. The liquid metal circulation loop further comprises a first diverter valve and a second diverter valve, the first diverter valve is connected into the heat absorption device, and the second diverter valve is connected into the thermo-acoustic power generation device. The dynamic cooperative controller is used for controlling the dynamic cooperative controller based on the flight state parameters of the hypersonic aircraft, the engine thrust requirement and the temperature of the key thermal protection part. The total flow of the liquid metal working medium and flow distribution in the heat absorption device and the thermo-acoustic power generation device are dynamically and cooperatively adjusted by controlling the liquid metal pump, the first diverter valve and the second diverter valve. According to the invention, the compactness of the system can be obviously improved, the heat sink consumption is greatly reduced, and a reliable and efficient heat management solution is provided for long-endurance hypersonic flight.

The utility model relates to a phase change thermo-acoustic engine experimental device which comprises a thermo-acoustic conversion system and an acoustic-electric conversion system. The thermo-acoustic conversion system comprises a sound production module and a Helmholtz resonant cavity, a ceramic plate stack soaked with water exists in the sound production module, and the stable temperature difference needed for generating the thermo-acoustic effect at the two ends of the ceramic plate stack is reduced. Sound waves generated by the thermoacoustic effect form standing waves in the Helmholtz resonant cavity, and the sound intensity is amplified; the acoustic-electric conversion system comprises piezoelectric ceramics and a triode common-emitter amplification circuit, the piezoelectric ceramics are arranged at the tail end of the resonant cavity and convert acoustic energy into electric energy, and the electric energy is amplified by the triode common-emitter amplification circuit and then drives a nixie tube to display. The experimental device integrates thermodynamics, fluid mechanics, acoustics, material science and electronic technology, has the characteristics of simple structure, low cost, rich physical process and strong exploration, is suitable for experimental teaching, particularly suitable for new engineering teaching requirements, and is beneficial to improving the multidisciplinary cross practice ability of students.

The oil-electricity hybrid aero-engine comprises a tail nozzle and an outer duct, and further comprises a motor and an electronic cooling loop, the system comprises a thermoacoustic engine and a first thermoacoustic heat pump, the thermoacoustic engine is arranged at the tail nozzle and used for absorbing heat of tail gas at the tail nozzle, and the first thermoacoustic heat pump is arranged at the tail nozzle and used for absorbing heat of the tail gas at the outer duct. Sound power is output; the first thermo-acoustic heat pump comprises a first cold-end heat exchanger, a first heat regenerator and a first hot-end heat exchanger, the first cold-end heat exchanger is used for absorbing heat to form a low-temperature area and is used for cooling the electronic cooling loop, part of heat is transmitted to the first hot-end heat exchanger through the first heat regenerator by utilizing acoustic power, and the first hot-end heat exchanger releases heat to the outer duct. The system utilizes a thermo-acoustic energy conversion technology to enhance the cooling of electronic parts, and can also recover tail gas waste heat to convert the tail gas waste heat into heat with a higher temperature level.

The invention relates to a thermoacoustic machine (1) comprising a control device (14) configured to modulate the acoustic power generated by one or more acoustic sources (6-9) so that the temperature of an external source (2) connected to one or more thermoacoustic cells (10-13) of the machine (1) reaches or remains substantially the same as a setpoint temperature. Figure for the abstract: Fig. 1

The application provides a light emitting device, an outdoor lighting device and an optical alarm device, which comprise a resonant tube, a thermoacoustic compressor and a light emitting body. The thermoacoustic compressor is arranged at one end of the resonant tube, and the light emitting body is arranged at the other end of the resonant tube. The thermoacoustic compressor can make the gas at the position where the thermoacoustic compressor is arranged of the resonant tube vibrate, so as to generate sound waves, the sound waves propagate along the axial direction of the resonant tube, when the sound waves propagate to the position of the light emitting body, the light emitting body is driven to vibrate, and the light emitting body emits light when the light emitting body vibrates, because the light emitting body uses a mechanoluminescent material. The light emitting device provided by the application converts heat energy into mechanical energy in the form of sound waves through the thermoacoustic effect, and then drives the mechanoluminescent material to vibrate, and the mechanoluminescent material converts the mechanical energy into light through the mechanoluminescent effect. Because the light emitting device provided by the application has almost no moving parts, the light emitting device has the advantages of simple structure, high reliability and long service life.

This application discloses a gas sensor and electronic device. The gas sensor includes a substrate, a micro-hot plate, and a microphone. At least one of the micro-hot plate and the microphone is disposed on the substrate. The micro-hot plate includes a heating element, and a thermoacoustic cavity is formed around the heating element. The microphone has a sensing cavity, with the sensing surface of the microphone facing the sensing cavity, and the sensing cavity communicating with the thermoacoustic cavity. The micro-hot plate also includes a first substrate and a heat insulation layer stacked together. The first substrate has a first through-hole, and the heating element is located within the heat insulation layer. Thus, the gas sensor of this embodiment, through the coordinated operation of the micro-hot plate and the microphone, can accurately detect the composition and concentration of gas using the thermoacoustic effect. Furthermore, it is fabricated using microfabrication technology, making it easy to integrate into various micro-devices and possessing broad application prospects.

The invention discloses a combustion instability feedforward control method and system based on modal early-stage identification, and belongs to the technical field of combustion control, and the method comprises the steps: S1, collecting a multi-physical field signal in a combustion chamber in real time; s2, based on the multi-physical field signal, identifying a current dominant mode and an amplitude increasing trend of combustion instability in real time; s3, double-condition judgment is carried out, and control is triggered before the oscillation amplitude reaches a preset safety threshold value; s4, matching a corresponding open-loop feedforward control strategy from a preset control strategy library; and S5, generating and applying a modal specific control instruction to drive an execution mechanism to perform intervention. According to the combustion instability feedforward control method and system based on modal early identification, early warning and modal specific control of combustion instability are achieved, the problems of phase mismatch and non-linear inadaptation are effectively avoided, the thermo-acoustic damage risk is remarkably reduced, and the reliability of the system is improved. And the robustness, the real-time performance and the engineering applicability of the control system are improved.

The invention relates to the technical field of power generation devices, and provides a nuclear fuel built-in loop free piston thermo-acoustic generator which comprises a thermo-acoustic engine, a control drum, a neutron reflecting layer and a piston type generator, the thermo-acoustic engine comprises a low-temperature heat exchanger, a heat regenerator and a reactor core which are arranged in sequence, and the reactor core is provided with a channel for working medium gas to circulate; the control drum is arranged on the peripheral side of the thermoacoustic engine; the thermoacoustic engine and the control drum are both arranged in the neutron reflecting layer, the piston type generator is provided with a main piston air cylinder, the main piston air cylinder is in acoustic communication with the outlet end of the thermoacoustic engine through an expansion cavity side resonance tube, and the piston type generator is used for converting part of acoustic power into electric energy and adjusting the acoustic impedance phase angle. The reactor core is directly used as a heat source to be arranged in the thermoacoustic engine, so that the reactor core directly replaces a hot end heat exchanger in the traditional technology, the arrangement of a middle heat transfer structure is avoided, the structure is simple, and the problem of low heat transfer efficiency caused by the heat transfer structure is avoided.

The application discloses a structure and method for inhibiting thermal acoustic oscillation of a gas turbine combustor, relates to the field of inhibiting thermal acoustic oscillation of a gas turbine combustor, and is applied to a combustor and comprises an outer layer pipe and an inner layer pipe, wherein the inner layer pipe is located in the outer layer pipe and the inner layer pipe and the outer layer pipe are coaxial; a back cavity is formed between the inner layer pipe and the outer layer pipe; a plurality of acoustic holes are arranged on the inner layer pipe and the acoustic holes are communicated with the back cavity; the space corresponding to the acoustic holes in the back cavity is a resonance cavity; and each acoustic hole and the resonance cavity form a resonance system. The application can effectively inhibit thermal acoustic oscillation of the gas turbine combustor and reduce the influence caused by the thermal acoustic oscillation.

There is disclosed a thermoacoustic system. The system comprises a thermocouple junction and an electronic signal generator for generating an acoustic frequency driving signal across the junction, which causes the system to generate an acoustic wave via the Peltier effect.

The present application relates to the technical field of heat pump, in particular to a two-coupled heat pump system. The present application aims to solve the problem of low energy efficiency of the existing two-coupled heat pump. For this purpose, the two-coupled heat pump system of the present application comprises: a thermoacoustic engine comprising a cold-end heat exchanger, a first hot-end heat exchanger and a second hot-end heat exchanger; a first outdoor heat exchange part in heat exchange with the cold-end heat exchanger; a compressor in circulation communication with the first hot-end heat exchanger through a first refrigerant pipeline; a throttling element between the exhaust port of the compressor and one end of the first hot-end heat exchanger; an intermediate heat exchanger having a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path being located between the exhaust port of the compressor and the throttling element; a first indoor heat exchange part in direct or indirect heat exchange with the second hot-end heat exchanger; and a second indoor heat exchange part in heat exchange with the second heat exchange flow path. The present application can realize greater temperature span operation of the system, improve the energy efficiency and application range of the system.

This application relates to the field of non-ferrous metal processing and forming equipment technology, and discloses an extrusion processing and manufacturing equipment for non-ferrous metal sheets. Along the running direction of the non-ferrous metal sheet, it sequentially includes a continuous extrusion forming module, a thermoacoustic adaptive flutter cooling transition module, and a continuous drawing forming module. The thermoacoustic adaptive flutter cooling transition module includes a synchronous flexible track follower system and a coaxial nested independent suspended micro-forging array mounted on the synchronous flexible track follower system. The synchronous flexible track follower system is used to clamp and follow the newly extruded non-ferrous metal sheet, and the coaxial nested independent suspended micro-forging array contacts the non-ferrous metal sheet. By relying on the porous ceramic regenerator and high-pressure inert gas inside the closed-loop standing wave thermoacoustic plunger body, the massive amount of waste heat emitted from the residual thermal stress concentration area of ​​the metal sheet is directly converted into standing wave sound pressure with directional bombardment capability, allowing the micro-forging array to start spontaneously without relying on any external electromechanical vibration source.

The application provides a warning method and system for the tipping moment of a thermoacoustic system under Lévy noise, and relates to the technical field of thermoacoustic system stability analysis and early warning control, which comprises the following steps: based on the physical model of the thermoacoustic system, a non-uniform wave equation describing the pressure and velocity fluctuation of the system is constructed; the Galerkin modal expansion and Taylor expansion truncation are performed on the equation, and a random differential equation model is established by combining the time-varying control parameters and Lévy noise; the random differential equation model is solved by the Monte Carlo simulation and the random fourth-order Runge-Kutta numerical method, and the amplitude sequence of the thermoacoustic system changing with time is obtained; based on the probability distribution of the amplitude sequence, the change of the system dynamics characteristics is quantified by calculating the Shannon entropy, and the sequence of the Shannon entropy changing with time is obtained; the warning moment when the Shannon entropy sequence first passes through the preset threshold is determined, and the warning domain is generated according to the time difference between the warning moment and the actual tipping moment of the thermoacoustic system, so that the warning for the tipping moment of the thermoacoustic system is realized.

The present application relates to the technical field of heat pump, in particular to a thermoacoustic heat pump device. The present application aims to solve the problem that the application scene of the existing vapor compression heat pump is limited. For this purpose, the thermoacoustic heat pump device of the present application comprises: a thermoacoustic machine comprising a hot end heat exchanger and a cold end heat exchanger; a compressor in circulation communication with the cold end heat exchanger; a first heat exchanger, one end of which is in communication with the suction port of the compressor; a throttling element, two ends of which are respectively in communication with one end of the cold end heat exchanger and the second end of the first heat exchanger; a second heat exchanger in circulation communication with the hot end heat exchanger through a first cold carrier pipeline; a first pump body arranged in the first cold carrier pipeline; the intermediate heat exchanger has a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path is communicated between the exhaust port of the compressor and the throttling element, and the second heat exchange flow path is communicated with the first cold carrier pipeline. The present application can realize the combination of the thermoacoustic machine and the vapor compression heat pump, and improve the applicability and working efficiency of the thermoacoustic heat pump device.

This application relates to the field of burner combustion control technology and discloses a burner fuel grading control optimization method. This method calculates the background noise energy during a silent monitoring period and selects the frequency of the minimum energy value as the target micro-perturbation frequency. A sinusoidal micro-perturbation signal is generated based on this frequency and superimposed on the command of the shift fuel regulating valve. Valve displacement and combustion chamber sound pressure signals are simultaneously acquired and orthogonal decoding is performed. Electromechanical transfer gain, thermoacoustic gain, and dynamic transmission phase difference are calculated and obtained. Based on the electromechanical transfer gain, it is determined whether amplitude compensation should be performed. A two-dimensional linkage verification matrix is ​​constructed by combining the time derivatives of the thermoacoustic gain and the dynamic transmission phase difference, thereby distinguishing between pure thermoacoustic mode over-limit and physical spatial anomalies, and executing the corresponding fuel grading closed-loop regulation or safety interlocking procedure. This invention eliminates valve mechanical execution errors, accurately distinguishes combustion instability conditions under strong noise backgrounds, and improves the safety of combustion system operation.

The utility model provides a thermo-acoustic power generation system which can reliably form a temperature gradient at a heat accumulator so as to improve the stability of thermo-acoustic power generation. The thermo-acoustic power generation system includes: a linear generator having a piston that vibrates within a cylinder to convert acoustic energy into electrical energy; an annular tube connected to the linear generator through the resonance tube; the prime motor is arranged in the annular pipe and comprises a cooler, a heat accumulator and a heater which are sequentially arranged, the cooler serves as a low-temperature side heat exchanger, the heater serves as a high-temperature side heat exchanger, and the heat accumulator forms a temperature gradient to generate thermo-acoustic self-excited vibration; the low-temperature side heat exchanger exchanges heat with first cooling water from the engine through a first cooling water loop, the low-temperature side heat exchanger can exchange heat with second cooling water through a second cooling water loop, and the second cooling water loop is independent of the first cooling water loop; the second cooling water is supplied to the low-temperature-side heat exchanger through the passage switching valve.

The invention relates to the technical field of heat pumps, in particular to a heat pump system. The invention aims to solve the problem that the application scene of the thermo-acoustic heat pump is relatively single. In order to achieve the purpose, the heat pump system comprises a thermo-acoustic machine, a heat exchanger and a heat pump, the outdoor heat exchanger comprises a first outdoor heat exchange part and a second outdoor heat exchange part, and heat exchange is conducted between the first outdoor heat exchange part and the cold end heat exchanger through a first secondary refrigerant; the indoor heat exchanger comprises a first indoor heat exchange part and a second indoor heat exchange part, and heat exchange is conducted between the first indoor heat exchange part and the hot end heat exchanger through a second refrigerating medium; an exhaust port of the compressor communicates with one end of the second indoor heat exchange part, and an air suction port communicates with one end of the second outdoor heat exchange part; and the two ends of the throttling element communicate with the other end of the second outdoor heat exchange part and the other end of the second indoor heat exchange part correspondingly. According to the heat pump system, the applicability of the system to different application scenes is improved, and the integration degree of the system is improved.

The present application relates to thermoacoustic engine technical field, provide a kind of phase modulation device and travelling wave thermoacoustic loop system, wherein, phase modulation device includes shell, first resonant tube and second resonant tube, and the cavity is inside in shell;First resonant tube is connected to the first end of shell and partially set in cavity, and first resonant tube entrance is set to the outside of shell, and first resonant tube outlet is set in cavity and is communicated with cavity;Second resonant tube is connected to the second end of shell and partially set in cavity, and second resonant tube outlet is set to the outside of shell, and second resonant tube entrance is set in cavity and is communicated with cavity.The phase modulation device of the present application is used for the phase modulation of travelling wave thermoacoustic loop system, by partially setting first resonant tube and second resonant tube inside cavity, the volume of phase modulation device is reduced, and the compactness of phase modulation device is improved;The pressure difference between the inside and outside of the pipe wall of first resonant tube and second resonant tube located in cavity is small, and the thickness of pipe wall can be reduced, and material is saved.

The invention relates to a thermo-acoustic combustion system (100) and a combustion and energy exchange apparatus (500) in the form of an L-shaped tube, for eliminating pests and undesirable vegetation. The combustion and energy exchange apparatus (500) comprises the thermo-acoustic combustion system (100), and a vaporizing system (200) comprising a dispersing trough (215). The thermo-acoustic combustion system (100) comprises a combustion chamber (120) housed in a vertical part of the L-shaped tube (105). The horizontal part of the L-shaped tube (205) is open at the bottom so that the emitted vapor reaches the ground and the vegetation to be eliminated. In the vertical part of the L-shaped tube (105), a reinforcing strap (108), a connecting element (50) and a fastening element (51) are provided for connecting the combustion and energy exchange apparatus (500) to a tractor or agricultural implement.

The invention relates to the technical field of heat pumps, in particular to a heat pump system. The problem that the application scene of the thermo-acoustic heat pump is single is solved. To this end, the heat pump system of the present application comprises: a thermo-acoustic machine having a cold-end heat exchanger and a hot-end heat exchanger; the first outdoor heat exchange part exchanges heat with the cold end heat exchanger through a first secondary refrigerant; an exhaust port of the compressor communicates with one end of the indoor heat exchanger, and an air suction port communicates with one end of the second outdoor heat exchange part; two ends of the throttling element are respectively communicated with the other end of the indoor heat exchanger and the other end of the second outdoor heat exchange part; and the intermediate heat exchanger is provided with a first heat exchange flow path and a second heat exchange flow path, the first heat exchange flow path exchanges heat with the hot end heat exchanger through a second secondary refrigerant, and the second heat exchange flow path exchanges heat with a refrigerant between the indoor heat exchanger or the exhaust port of the compressor and the throttling element. The advantages of the thermo-acoustic machine and the compressor can be exerted, and the applicability of the system to different application scenes is improved.

The invention relates to the technical field of heat pumps, in particular to a dual heat supply pump system. The invention aims to solve the problem of low energy efficiency of the existing steam compression cycle dual heat supply pump in a low-temperature environment. To this end, the heat pump system of the present application comprises: a thermo-acoustic machine having a cold-end heat exchanger and a hot-end heat exchanger; the first outdoor heat exchange part exchanges heat with the cold end heat exchanger through a first secondary refrigerant; the dual-purpose heat exchanger directly or indirectly exchanges heat with the hot end heat exchanger through a second refrigerating medium; the intermediate heat exchanger is provided with a first heat exchange flow path and a second heat exchange flow path, and the first heat exchange flow path exchanges heat with the dual-purpose heat exchanger; an exhaust port of the compressor communicates with one end of the second heat exchange flow path, and an air suction port communicates with one end of the second outdoor heat exchange part; the two ends of the throttling element communicate with the other end of the second heat exchange flow path and the other end of the second outdoor heat exchange part correspondingly. Different operation modes can be selected based on different application scenes, and the operation energy efficiency of the system is improved.

An underwater sound generation device may be used for effective control of algae and other microorganisms in ponds and lakes. The sound projector may comprise a thermoacoustic sound transducer and an electronic unit for controlling the operation of the projector. The thermoacoustic projector may include a freestanding carbon nanotube (CNT) film encapsulated between two vibrating plates. The inert gas filled thin acoustical cavity provides a piston-type displacement of the plates and supports a high-temperature operation. A power supply driver, controlling the operation of the sound radiating system, may include a pulse generator, high-power switch amplifier, and a cable, connecting the projector with an electronic driver. The sound control system may provide an omnidirectional sound pressure level in a wide frequency range to affect the algae growth ecosystem over large distances.

The present application relates to the technical field of air conditioning, in particular to an air conditioning system. The present application aims to solve the problem that the application scene of the existing vapor compression cycle air conditioner is limited. To this end, the air conditioning system of the present application comprises: a thermoacoustic engine having a cold end heat exchanger, a first hot end heat exchanger and a second hot end heat exchanger; a first outdoor heat exchange part which exchanges heat with the cold end heat exchanger through a first cold carrier; a heat storage device for storing water, the water inlet and outlet of which are communicated with both ends of the first hot end heat exchanger; a first pump body arranged in the first cold carrier pipeline; a heat exchange component which directly or indirectly exchanges heat with the second hot end heat exchanger; an intermediate heat exchanger having a first heat exchange flow path, a compressor, a first heat exchange flow path, a throttling element and a second outdoor heat exchange part which are sequentially communicated; the first heat exchange flow path of the intermediate heat exchanger can exchange heat with the water and / or the second cold carrier in the heat storage device. The present application can improve the application scene of the air conditioner and avoid the decline of the working efficiency of the air conditioning system in high and low temperature environments.

To provide a thermoacoustic device with improved efficiency.SOLUTION: The thermoacoustic device 1a includes a fluid pipe 2 filled with a working fluid and including a pipe body part 21 and a pipe large diameter part 22 having an inside diameter larger than that of the pipe body part 21, a thermoacoustic converting part 3 disposed inside the pipe large diameter part 22, and an orifice part 4 disposed inside the fluid pipe 2. In the thermoacoustic device 4a, the orifice part 4 includes a through-hole 4a through which the working fluid flows, and a small orifice diameter part 4b in which an inside diametrical size of the through-hole 4b is smaller than other parts, and the small orifice diameter part 1a is arranged in a boundary part 23 between the pipe body part 21 and the large pipe diameter part 22.SELECTED DRAWING: Figure 1

The application relates to the technical field of low-temperature refrigeration, and provides a magnetic screw drive thermal-acoustic refrigeration system and method, which comprises at least one thermal-acoustic refrigeration basic unit, the unit comprising a pressure wave generating device, a thermal-acoustic refrigerator and a resonance tube. The pressure wave generating device comprises a pressure-resistant shell, a rotating motor, a magnetic screw shaft, a mover permanent magnet, a compression piston and a rotor permanent magnet arranged on the magnetic screw shaft; the magnetic screw shaft is connected with the rotating motor, the compression piston is arranged in the pressure-resistant shell, the mover permanent magnet is connected with the compression piston and is arranged in opposite interval with the rotor permanent magnet; a compression cavity is formed between the compression piston and the pressure-resistant shell; and the resonance tube is communicated with the compression cavity and the thermal-acoustic refrigerator. The rotating motor is used as a power source, the pressure wave generating device is used to replace a linear compressor, the manufacturing difficulty and cost are reduced, the rotating motor has high power density and high magnetic coupling efficiency, a large sound power can be output in a small volume, and the demand for high refrigeration capacity density is met.

The invention relates to the technical field of heat pumps, in particular to a triple-generation heat pump system. The problem that an existing steam compression type triple heat supply pump is low in energy efficiency is solved. In order to achieve the purpose, the triple co-generation heat pump system comprises a thermo-acoustic machine, a heat pump system and a heat pump system, the outdoor heat exchanger comprises a first outdoor heat exchange part and a second outdoor heat exchange part, and the first outdoor heat exchange part exchanges heat with the cold end heat exchanger through a first secondary refrigerant; the heating heat exchanger exchanges heat with the hot end heat exchanger through a second refrigerating medium; a domestic hot water heat exchanger; one end of the indoor heat exchanger communicates with one end of the second outdoor heat exchange part; the exhaust port is communicated with one end of the domestic hot water heat exchanger, and the air suction port is communicated with the other end of the indoor heat exchanger; the two ends of the first throttling element communicate with the other end of the domestic hot water heat exchanger and the other end of the second outdoor heat exchange part correspondingly. On the basis of realizing triple co-generation, the running efficiency of the system can be greatly improved.

This invention proposes a combustion chamber thermoacoustic oscillation suppression system and debugging method. In the system, a first acoustic liner is detachably fixed to a flow guide bushing. The method includes: installing a first acoustic liner without a first channel onto the flow guide bushing; obtaining initial thermoacoustic oscillation parameters of the combustion chamber; based on the initial thermoacoustic oscillation parameters, replacing at least a portion of the first acoustic liner without a first channel with a first acoustic liner having a first channel; obtaining subsequent thermoacoustic oscillation parameters of the combustion chamber; based on the subsequent thermoacoustic oscillation parameters of the combustion chamber, determining whether the subsequent thermoacoustic oscillation parameters meet the design target; if the design target is met, debugging ends; if the design target is not met, the first acoustic liner is adjusted. Applying this invention not only allows the first chamber to suppress thermoacoustic oscillations but also enables precise control of the combustion chamber's vibration suppression capability by replacing the first acoustic liner.

The invention relates to a method (1) for producing a piston (2) having a core body (3) and at least one support (4). In the method (1), the core body (3) and the at least one support (4) are interconnected via an intermetallic aluminum finishing layer. The invention also relates to a piston (2) produced in the method (1) and to a thermoacoustic heat pump comprising the piston (2).

The invention relates to the technical field of air compressor systems, and discloses an energy-saving air inlet system of an air compressor, which comprises the following modules: a traveling wave thermoacoustic refrigeration module for performing passive refrigeration on inlet air by using pressure pulsation energy in a main air inlet pipeline; the acoustic impedance matching and harmonic filtering coupling structure is used for optimizing sound energy transmission between modules and purifying driving sound waves; the self-adaptive Helmholtz resonance pressurization module is provided with variable geometric parameters and is used for realizing pulsating pressurization; and a cooperative control unit. And the cooperative control unit controls variable geometric parameters of the self-adaptive Helmholtz resonance pressurization module according to the real-time operation working condition of the compressor, so that the natural resonance frequency of the self-adaptive Helmholtz resonance pressurization module is dynamically matched with the fundamental frequency of air inlet pulsation. According to the air compressor, cooperative work of air inlet passive refrigeration and all-working-condition self-adaptive resonance pressurization is achieved, and the volume efficiency and the system energy efficiency of the air compressor are remarkably improved.