CN117589496B - Stirling engine heat exchanger testing device and testing method thereof - Google Patents
Stirling engine heat exchanger testing device and testing method thereof Download PDFInfo
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- CN117589496B CN117589496B CN202410053715.7A CN202410053715A CN117589496B CN 117589496 B CN117589496 B CN 117589496B CN 202410053715 A CN202410053715 A CN 202410053715A CN 117589496 B CN117589496 B CN 117589496B
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- 238000012360 testing method Methods 0.000 title claims abstract description 71
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 31
- 238000011084 recovery Methods 0.000 claims abstract description 13
- 230000000737 periodic effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims abstract description 3
- 238000005485 electric heating Methods 0.000 claims description 26
- 239000001307 helium Substances 0.000 claims description 23
- 229910052734 helium Inorganic materials 0.000 claims description 23
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 230000005284 excitation Effects 0.000 claims description 12
- 239000007789 gas Substances 0.000 claims description 7
- 230000008929 regeneration Effects 0.000 claims description 6
- 238000011069 regeneration method Methods 0.000 claims description 6
- 238000010998 test method Methods 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 3
- 238000011056 performance test Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 230000003534 oscillatory effect Effects 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a Stirling engine heat exchanger testing device, which comprises: a heating system: for testing the heating performance of the heater; and (3) a heat recovery system: the method is used for testing the heat accumulating capacity and the flow resistance loss of the heat regenerator; and (3) a cooling system: for testing the cooling performance of the cooler; oscillating flow generating system: for driving the two pistons to move according to a set phase to form periodic pressure waves. The invention also provides a testing method of the four Stirling engine heat exchanger testing devices. The invention solves the problems that the performance test of the existing heat exchanger is difficult to simulate the actual working environment, unidirectional flow and oscillating flow are difficult to combine, the test of the whole machine is complex, and the like.
Description
Technical Field
The invention belongs to the technical field of heat exchanger testing, and relates to a testing device and a testing method for a heat exchanger of a Stirling engine.
Background
The stirling engine is an external combustion engine which operates with thermal expansion and contraction, with the free piston stirling engine being an important branch. The free piston Stirling engine is mainly characterized in that a gas working medium is influenced by temperature, and then expansion and compression are carried out to push a gas distribution piston and a power piston to reciprocate. It has the advantages of high reliability, long service life, low noise, etc.
The heat exchange component is an important component of the Stirling engine and plays a vital role in the power and efficiency of the Stirling engine. The heat exchange part is mainly divided into a heater, a heat regenerator and a cooler, wherein the heater is mainly responsible for heating working media, so that the working media are heated and expanded, further, the piston is pushed to move, and the high-performance heater can enable the working media to be heated more quickly, so that the working capacity of the working media is improved. The heat regenerator is mainly responsible for periodically carrying out heat accumulation and heat dissipation on working media, plays roles of energy accumulation and energy conservation, and can greatly improve the working media efficiency and lighten the working pressure of the heater and the cooler. The cooler is mainly responsible for cooling the working medium, so that the working medium is compressed when encountering cold, and then the piston is pushed to move, the high-performance cooler can quickly take away the heat released by the working medium, the temperature of the working medium is reduced, and the working capacity of the working medium is improved. The three components are indispensable, so that the heat exchange component with good performance is the basis for designing the Stirling engine.
However, the flow rule of the working medium in the heat exchange part is complex, the factors influencing the performance of the part are various, the working conditions of high temperature, high pressure and high frequency are high, the flow direction is alternated back and forth, and the temperature and the air pressure are difficult to measure. Aiming at the problem that the performance of the heat exchange component of the existing free piston Stirling engine is difficult to test, the invention provides the heat exchanger performance testing equipment and the heat exchanger performance testing method, which can simultaneously test the performance parameters of a heater, a heat regenerator, a cooler and two working modes of unidirectional flow and oscillating flow, can ensure the optimization of the design of the heat exchanger, the improvement of the output power, the working efficiency and the service life of the Stirling engine, and has excellent application value.
The traditional heat exchanger performance test is difficult to simulate the actual working environment, the reciprocating motion of the piston is completed by utilizing the air compressor, the frequency improvement is limited by the working form of the belt and the roller, and the working frequency is usually within 10Hz and is far lower than the working frequency of a Stirling engine by 30-50Hz; the working temperature of the piston is affected by the working temperature of the whole air compressor, the working temperature is approximately 100 ℃, the working temperature is far lower than the working temperature of the heater of 500 ℃, and working medium at the hot end directly contacts with the piston to cause the working failure of the piston; meanwhile, as no back pressure cavity is used as buffer, one side of the piston is at atmospheric pressure, the pressure difference of two sides is small, the pressure of the test platform is approximately 0.4mpa, and the pressure is far lower than the working pressure of the Stirling engine by 2mpa; finally, the air compressor is difficult to integrate and integrate, the tightness of the piston and the air cylinder is difficult to guarantee, and the air leakage problem is serious. If the valve piston is independently used for driving, the phase positions of the valve piston and the power piston cannot be changed, the heat exchange efficiency and the flow resistance characteristic of the working medium are greatly influenced, the influence of the phase position is difficult to observe, and the working condition of an actual Stirling engine cannot be simulated; and meanwhile, measurement of a unidirectional flow experiment cannot be completed. The whole machine test is very complicated, the assembly and processing requirements are very high, the stable operation of Stirling is difficult to realize, and the experimental result is seriously influenced.
Disclosure of Invention
In order to achieve the above purpose, the invention provides a testing device and a testing method for a Stirling engine heat exchanger, which solve the problems that the existing heat exchanger performance test is difficult to simulate the actual working environment, unidirectional flow and oscillating flow are difficult to combine, the whole machine test is complex, and the like.
In order to solve the technical problems, the invention adopts the technical scheme that the testing device for the heat exchanger of the Stirling engine comprises:
a heating system: for testing the heating performance of the heater;
and (3) a heat recovery system: the method is used for testing the heat accumulating capacity and the flow resistance loss of the heat regenerator;
and (3) a cooling system: for testing the cooling performance of the cooler;
oscillating flow generating system: for driving the two pistons to move according to a set phase to form periodic pressure waves.
Further, the heating system comprises a heating cavity, and cooling fins are arranged on two sides of an air inlet at the top of the heating cavity; the air inlet is sealed by a top bolt and a raw material belt, and a pressure sensor is arranged on the top bolt; the two sides of the bottom of the heating cavity are provided with heaters, the outer sides of the heaters are provided with electric heating heads, and the heating rods are inserted into the electric heating heads; the heaters are positioned at two sides of the cylinder of the oscillating flow generating system; temperature sensors are thermally arranged at two ends of the heater; the heating system is positioned at the uppermost part of the Stirling engine heat exchanger testing device.
Further, the heat regeneration system comprises heat regenerators, and the heat regenerators are positioned at two sides of a cylinder of the oscillating flow generating system; temperature sensors are arranged at two ends of the heat regenerator, and pressure sensors are arranged at two ends of the heat regenerator; the heat regeneration system is connected with the lower end of the heating system through a flange.
Further, the cooling system comprises coolers which are positioned at two sides of the cylinder of the oscillating flow generating system; the outer side of the cooler is provided with a water-cooling joint; temperature sensors are arranged at two ends of the cooler; the cooling system is connected with the lower end of the heat regeneration system through a flange.
Further, the oscillating flow generating system comprises a second air distribution piston, a piston rod of the second air distribution piston penetrates through the first air distribution piston and then is connected with a second air distribution piston rotor, a second air distribution piston stator is arranged on the outer side of the second air distribution piston rotor, and the second air distribution piston stator is externally connected with a controller; the bottom of the first air distribution piston is connected with a first air distribution piston rotor, a first air distribution piston stator is arranged on the outer side of the first air distribution piston rotor, and the first air distribution piston stator is externally connected with a controller; the first air distribution piston stator is arranged above the second air distribution piston stator; the second air distribution piston, the second air distribution piston rotor, the second air distribution piston stator, the first air distribution piston rotor and the first air distribution piston stator are all positioned in the air cylinder; the bottom of the air cylinder is provided with a flange.
The invention also provides a testing method of the Stirling engine heat exchanger testing device, which comprises the following specific steps:
removing a top bolt, a cylinder bottom flange, a heat recovery system, a cooling system, a first air distribution piston rotor and a first air distribution piston stator; helium working medium is introduced into the top external air inlet; the controller outputs a direct current excitation signal to the second air distribution piston stator, the second air distribution piston is fixed, the heating rod heats the electric heating head, the electric heating head transmits heat to the heater, and the temperature of the working medium rises after flowing through the heater and flows out from the bottom of the air cylinder; and observing the inlet temperature and the outlet temperature of the heater through temperature sensors at two ends of the heater, and evaluating the performance of the heater according to the inlet and outlet temperature difference.
The invention also provides a testing method of the Stirling engine heat exchanger testing device, which comprises the following specific steps:
removing a top bolt, a cylinder bottom flange, a first air distribution piston rotor and a first air distribution piston stator; helium working medium is introduced into the top external air inlet; the controller outputs a direct current excitation signal to the second air distribution piston stator, the second air distribution piston is fixed, the heating rod heats the electric heating head, the electric heating head transmits heat to the heater, the temperature of helium working medium rises after flowing through the heater and then flows into the regenerator, the regenerator stores heat of the helium working medium and flows into the cooler, water circulation in the water cooling joint cools the cooler, heat of the helium working medium is taken away by the cooler, and the working medium flows out from the bottom of the cylinder; and observing the inlet temperature and the outlet temperature of the heat regenerator through temperature sensors at two ends of the heat regenerator, and evaluating the performance of the heat regenerator according to the inlet-outlet temperature difference.
The invention also provides a testing method of the Stirling engine heat exchanger testing device, which comprises the following specific steps:
removing a top bolt, a cylinder bottom flange, a first air distribution piston rotor, a first air distribution piston stator and a heat recovery system; helium working medium is introduced into the top external air inlet; the controller outputs a direct current excitation signal to the second air distribution piston stator, the second air distribution piston is fixed, the heating rod heats the electric heating head, the electric heating head transmits heat to the heater, the temperature of working medium rises after flowing through the heater and flows into the cooler, water circulation in the water cooling joint cools the cooler, the heat of the working medium is taken away by the cooler, and helium working medium flows out from the bottom of the cylinder; and observing the inlet temperature and the outlet temperature of the cooler through temperature sensors at two ends of the cooler, and evaluating the performance of the cooler according to the inlet and outlet temperature difference.
The invention also provides a testing method of the Stirling engine heat exchanger testing device, which comprises the following specific steps:
removing a top bolt, filling high-pressure helium gas into the cylinder from the top, and then installing the top bolt; the controller outputs alternating current signals to excite the first air distribution piston and the second air distribution piston to move, and the phase of the excitation signals is controlled to realize any change of the phase of the first air distribution piston and the phase of the second air distribution piston; the first air distribution piston and the second air distribution piston move in a staggered way, so that the working medium flows back and forth, and in the upper half period, the working medium is heated by the heater and then rises in temperature, the working medium flows through the heat regenerator to release heat, and then flows through the cooler to cool; the working medium in the lower half period is cooled by a cooler, flows through a heat regenerator to absorb heat, and flows through a heater to heat; the temperature sensors at the two ends of the heat regenerator are used for observing the inlet temperature and the outlet temperature, so that the heat exchange capacity of the heat regenerator is calculated; meanwhile, the pressure sensors at the two ends of the heat regenerator are used for observing the inlet pressure and the outlet pressure, so that the flow resistance loss of the heat regenerator is calculated; the combination of heat exchange capacity and flow resistance loss was used to test the performance of the regenerator.
The beneficial effects of the invention are as follows:
the invention creatively provides a heat exchanger performance test device and a test method, which can simultaneously test performance parameters of a heater, a heat regenerator, a cooler and two working modes of unidirectional flow and oscillatory flow, meet working conditions of high temperature, high pressure, high frequency and variable phase, and can better simulate the working condition of a real Stirling engine.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a heat exchanger testing apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an apparatus structure of a unidirectional flow test heater according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of an apparatus structure of a unidirectional flow test regenerator according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of the apparatus structure of the unidirectional flow test cooler according to the embodiment of the present invention.
Fig. 5 is a schematic diagram of an apparatus structure of an oscillatory flow test regenerator according to an embodiment of the present invention.
In the figure, the heat sink 1, the heater 2, the heat regenerator 3, the cooler 4, the first air distribution piston stator 5, the first air distribution piston rotor 6, the second air distribution piston stator 7, the second air distribution piston rotor 8, the top bolt 9, the heating rod 10, the electric heating head 11, the second air distribution piston 12, the water cooling joint 13 and the first air distribution piston 14.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a testing device for a heat exchanger of a Stirling engine, which comprises a heating system, a heat recovery system, a cooling system and an oscillation flow generating system, wherein the heating system is used for testing the heating performance of a heater, the heat recovery system is used for testing the heat recovery capacity and the flow resistance loss of the heat recovery device, the cooling system is used for testing the cooling performance of a cooler, and the oscillation flow generating system is used for driving two distribution pistons to move according to a set phase to form periodic pressure waves.
As shown in fig. 1, the heat radiating fin 1, the heater 2, the top bolt 9, the heating rod 10 and the electric heating head 11 form a heating system of the heat exchanger testing device of the Stirling engine, the whole heat radiating fin is detachable, the graphite metal winding gasket is used for sealing, the graphite metal gasket can resist the high temperature of 800 ℃, and the working environment of the high temperature is ensured while the air tightness is ensured. The top bolt 9 is opened during unidirectional flow test and is used for communicating with the air inlet and introducing helium gas for test; the top bolt 9 is closed during the oscillatory flow test for connection with a pressure sensor for testing the heating chamber pressure. In order to prevent that top temperature is too high, the raw material area melts, influences the gas tightness, installs fin 1 in top pressure sensor below, and fin 1 is the stainless steel ring, can effectively block the heat radiation, reduces top temperature. The electric heating head 11 is a red copper circular ring, and a hole is reserved in the middle of the electric heating head for inserting the heating rod 10 to heat the Stirling engine. The heater is red copper circular ring structure, adopts inside radial fin design, and fin interval and fin quantity can design in a flexible way. The heater 2 is thermally provided with temperature sensors at both ends for measuring the temperature at both ends of the heater 2.
The heat regenerator system of the Stirling engine heat exchanger testing device mainly comprises a heat regenerator 3 and a filler, wherein the heat regenerator 3 mainly comprises a wire mesh, random fibers, metal sheets and the like, and can be flexibly changed; the filler is a stainless steel ring, adopts an inner radial fin design, and is mainly used for changing the length of the heat regenerator 3 for filling. Temperature sensors are arranged at two ends of the heat regenerator 3 and are used for measuring the temperatures at two ends of the heat regenerator 3. Pressure sensors are further arranged at two ends of the heat regenerator 3 and used for calculating pressure differences at two ends of the heat regenerator 3.
The cooler 4 and the water-cooling joint 13 form a cooling system of the Stirling engine heat exchanger testing device, and the water-cooling joint 13 is mainly used for connecting water circulation and reducing the temperature of working media. The cooler 4 is of a red copper circular ring structure, wherein the outer part adopts a circumferential fin design for cooling water to flow through, the inner part adopts radial fins, and the fin distance and the fin number can be flexibly designed. Temperature sensors are provided at both ends of the cooler 4 for measuring the temperatures at both ends of the cooler 4.
In the oscillating flow generating system of the Stirling engine heat exchanger testing device, a second air distribution piston 12 and a cylinder are assembled with a gap of 0.1mm, a piston rod of the second air distribution piston 12 passes through a first air distribution piston 14 and then is connected with a second air distribution piston rotor 8, and the second air distribution piston rotor 8 is an annular permanent magnet and adopts a moving magnet structure design; the outer side of the second valve piston rotor 8 is provided with a second valve piston stator 7, and the second valve piston stator 7 is externally connected with a controller for driving a second valve piston 12. The first air distribution piston 14 and the air cylinder are provided with a gap of 0.04mm, the piston rods of the first air distribution piston 14 and the second air distribution piston 12 are provided with a gap of 0.04mm for assembly, the bottom of the first air distribution piston 14 is connected with a first air distribution piston rotor 6, the first air distribution piston rotor 6 is an annular permanent magnet, and a moving magnetic type structural design is adopted; the first air distribution piston stator 5 is arranged on the outer side of the first air distribution piston rotor 6, the first air distribution piston stator 5 is externally connected with a controller and is used for driving the first air distribution piston 14, the working frequency of the piston is the working frequency of the motor, the working frequency can be flexibly changed from a few Hz to tens of Hz, and the phase can be also optionally changed. The first displacer stator 5 is disposed above the second displacer stator 7. By adopting the form of integral encapsulation, the first air distribution piston 14 and the second air distribution piston 12 are wrapped by the shell, a back pressure cavity is arranged below the bottom of the first air distribution piston 14, the back pressure cavity can play a role in buffering, the air pressure can be increased to more than 2mpa, and the overlarge pressure difference between the inside and the outside is prevented, so that the driving is difficult.
The testing device can be used for testing the performances of the heater 2, the heat regenerator 3 and the cooler 4 by unidirectional flow, and the specific testing method is as follows:
as shown in fig. 2, when the performance of the heater 2 is tested, the top bolt 9, the first air distribution piston 14 and the bottom flange are removed, and helium working medium is introduced into the top external air inlet. The heat recovery system, the cooling system, the first air distribution piston rotor 6 and the first air distribution piston stator 5 are not installed, the controller outputs a direct current excitation signal to the second air distribution piston stator 7, the second air distribution piston 12 is fixed, the heating rod 10 heats the electric heating head 11, the electric heating head 11 transfers heat to the heater 2, and the temperature of the working medium rises after flowing through the heater 2 and flows out of the bottom of the cylinder. Temperature sensors are placed at both ends of the heater 2 for observing inlet and outlet temperatures, and the performance of the heater 2 is evaluated according to the temperature difference.
As shown in fig. 3, when the performance of the regenerator 3 is tested, the top bolt 9, the first air distribution piston 14 and the bottom flange are removed, and the top is externally connected with an air inlet for introducing helium working medium and allowing the helium to flow out from the bottom. The controller outputs a direct current excitation signal to the second air distribution piston stator 7, the second air distribution piston 12 is fixed, the heating rod 10 heats the electric heating head 11, the electric heating head 11 transfers heat to the heater 2, the temperature of the working medium rises after flowing through the heater 2 and then flows into the heat regenerator 3, the heat regenerator 3 stores heat and flows into the cooler 4, water circulation is arranged in the water cooling joint 13 to cool the cooler 4, the heat of the working medium is taken away by the cooler 4, and the working medium flows out from the bottom of the cylinder. Temperature sensors are arranged at two ends of the heat regenerator 3 and used for observing inlet and outlet temperatures, and the performance of the heat regenerator 3 is evaluated according to the temperature difference. The regenerator 3 is filled by a porous medium, and the length of the regenerator can be changed through stainless steel filler, so that the optimal design is convenient.
As shown in fig. 4, when the performance of the cooler 4 is tested, the top bolts 9, the first air distribution piston 14 and the bottom flange are removed, and the top is externally connected with an air inlet for introducing helium working medium, and helium flows out from the bottom. The heat recovery system and the first air distribution piston 14 are not installed, the controller outputs a direct current excitation signal to the second air distribution piston stator 7, the second air distribution piston 12 is fixed, the heating rod 10 heats the electric heating head 11, the electric heating head 11 transfers heat to the heater 2, the temperature of working medium rises after flowing through the heater 2 and flows into the cooler 4, water circulation is arranged in the water cooling joint 13 to cool the cooler 4, heat of the working medium is taken away by the cooler 4, and the working medium flows out from the bottom of the cylinder. Temperature sensors are placed at both ends of the cooler 4 for observing the inlet and outlet temperatures, and the performance of the cooler 4 is evaluated based on the temperature difference. The cooler 4 is matched in a sliding way, can be simply disassembled, and is convenient for optimizing design.
As shown in fig. 5, the testing device of the present invention may also be used for testing the performance of the regenerator 3 by using an oscillating flow, specifically, the high-pressure helium gas is filled into the cylinder, the controller outputs an alternating current signal to excite the first displacer 14 and the second displacer 12 to move, and the phase of the excitation signal is controlled to realize any change of the phase of the first displacer 14 and the second displacer 12. The first air distribution piston 14 and the second air distribution piston 12 move in a staggered way to enable the working medium to flow back and forth, so that in the upper half period, the working medium is heated by the heater 2 and then rises in temperature, flows through the heat regenerator 3 to release heat, and then flows through the cooler 4 to cool; the working medium in the next half period is cooled by the cooler 4, flows through the heat regenerator 3 to absorb heat, and flows through the heater 2 to heat. Temperature sensors are arranged at two ends of the heat regenerator 3 and used for observing inlet and outlet temperatures, so that the heat exchange capacity of the heat regenerator 3 is calculated; pressure sensors are simultaneously placed for observing the inlet and outlet pressures, so as to calculate the flow resistance loss of the regenerator 3, and the two are combined for testing the performance of the regenerator 3.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (5)
1. A stirling engine heat exchanger test device comprising:
a heating system: for testing the heating performance of the heater;
and (3) a heat recovery system: the method is used for testing the heat accumulating capacity and the flow resistance loss of the heat regenerator;
and (3) a cooling system: for testing the cooling performance of the cooler;
oscillating flow generating system: the valve pistons are used for driving the two valve pistons to move according to a set phase to form periodic pressure waves;
the heating system comprises a heating cavity, and cooling fins (1) are arranged on two sides of an air inlet at the top of the heating cavity; the air inlet is sealed by a top bolt (9) and a raw material belt, and a pressure sensor is arranged on the top bolt (9); the two sides of the bottom of the heating cavity are provided with heaters (2), the outer sides of the heaters (2) are provided with electric heating heads (11), and heating rods (10) are inserted into the electric heating heads (11); the heater (2) is positioned at two sides of a cylinder of the oscillating flow generating system; temperature sensors are thermally arranged at two ends of the heater (2); the heating system is positioned at the uppermost part of the Stirling engine heat exchanger testing device;
the heat regeneration system comprises a heat regenerator (3), and the heat regenerator (3) is positioned at two sides of a cylinder of the oscillating flow generating system; temperature sensors are arranged at two ends of the heat regenerator (3), and pressure sensors are arranged at two ends of the heat regenerator (3); the heat regeneration system is connected with the lower end of the heating system through a flange;
the cooling system comprises a cooler (4), wherein the cooler (4) is positioned at two sides of a cylinder of the oscillating flow generating system; a water-cooling joint (13) is arranged at the outer side of the cooler (4); temperature sensors are arranged at two ends of the cooler (4); the cooling system is connected with the lower end of the heat regeneration system through a flange;
the oscillating flow generation system comprises a second air distribution piston (12), a piston rod of the second air distribution piston (12) penetrates through the first air distribution piston (14) and then is connected with a second air distribution piston rotor (8), a second air distribution piston stator (7) is arranged on the outer side of the second air distribution piston rotor (8), and the second air distribution piston stator (7) is externally connected with a controller; the bottom of the first air distribution piston (14) is connected with a first air distribution piston rotor (6), a first air distribution piston stator (5) is arranged on the outer side of the first air distribution piston rotor (6), and the first air distribution piston stator (5) is externally connected with a controller; the first valve piston stator (5) is arranged above the second valve piston stator (7); the second air distribution piston (12), the second air distribution piston rotor (8), the second air distribution piston stator (7), the first air distribution piston (14), the first air distribution piston rotor (6) and the first air distribution piston stator (5) are all positioned in the air cylinder; the bottom of the air cylinder is provided with a flange.
2. A method of testing a stirling engine heat exchanger test means in accordance with claim 1, comprising the steps of:
removing a top bolt (9), a cylinder bottom flange, a heat recovery system, a cooling system, a first air distribution piston (14), a first air distribution piston rotor (6) and a first air distribution piston stator (5); helium working medium is introduced into the top external air inlet; the controller outputs a direct current excitation signal to the second air distribution piston stator (7), the second air distribution piston (12) is fixed, the heating rod (10) heats the electric heating head (11), the electric heating head (11) transfers heat to the heater (2), and the temperature of the working medium rises after flowing through the heater (2) and flows out from the bottom of the cylinder; and observing inlet and outlet temperatures of the heater (2) through temperature sensors at two ends of the heater (2), and evaluating the performance of the heater (2) according to inlet and outlet temperature differences.
3. A method of testing a stirling engine heat exchanger test means in accordance with claim 1, comprising the steps of:
removing a top bolt (9), a cylinder bottom flange, a first air distribution piston (14), a first air distribution piston rotor (6) and a first air distribution piston stator (5); helium working medium is introduced into the top external air inlet; the controller outputs a direct current excitation signal to the second air distribution piston stator (7), the second air distribution piston (12) is fixed, the heating rod (10) heats the electric heating head (11), the electric heating head (11) transfers heat to the heater (2), the temperature of helium working medium rises after flowing through the heater (2) and then flows into the heat regenerator (3), the heat regenerator (3) stores heat of the helium working medium and flows into the cooler (4), water circulation is arranged in the water cooling joint (13) to cool the cooler (4), the heat of the helium working medium is taken away by the cooler (4), and the working medium flows out from the bottom of the cylinder; and observing inlet and outlet temperatures of the heat regenerator (3) through temperature sensors at two ends of the heat regenerator (3), and evaluating the performance of the heat regenerator (3) according to inlet and outlet temperature differences.
4. A method of testing a stirling engine heat exchanger test means in accordance with claim 1, comprising the steps of:
removing a top bolt (9), a cylinder bottom flange, a first air distribution piston (14), a first air distribution piston rotor (6), a first air distribution piston stator (5) and a heat recovery system; helium working medium is introduced into the top external air inlet; the controller outputs a direct current excitation signal to the second air distribution piston stator (7), the second air distribution piston (12) is fixed, the heating rod (10) heats the electric heating head (11), the electric heating head (11) transfers heat to the heater (2), the temperature of working medium rises after flowing through the heater (2) and flows into the cooler (4), water circulation is arranged in the water cooling joint (13) to cool the cooler (4), the heat of the working medium is taken away by the cooler (4), and helium working medium flows out from the bottom of the cylinder; and observing the inlet temperature and the outlet temperature of the cooler (4) through temperature sensors at two ends of the cooler (4), and evaluating the performance of the cooler (4) according to the inlet-outlet temperature difference.
5. A method of testing a stirling engine heat exchanger test means in accordance with claim 1, comprising the steps of:
removing a top bolt (9), filling high-pressure helium gas into the cylinder from the top, and then installing the top bolt (9); the controller outputs alternating current signals to excite the first air distribution piston (14) and the second air distribution piston (12) to move, and the phase of the excitation signals is controlled to realize any change of the phase of the first air distribution piston (14) and the phase of the second air distribution piston (12); the first air distribution piston (14) and the second air distribution piston (12) move in a staggered way to enable the working medium to flow back and forth, so that the working medium is heated by the heater (2) in the upper half period, then is heated, flows through the heat regenerator (3) to release heat, and then flows through the cooler (4) to cool; the working medium in the lower half period is cooled by a cooler (4), flows through a heat regenerator (3) to absorb heat, and flows through a heater (2) to heat; the temperature sensors at two ends of the heat regenerator (3) are used for observing the inlet temperature and the outlet temperature, so that the heat exchange capacity of the heat regenerator (3) is calculated; meanwhile, the inlet pressure and the outlet pressure are observed through pressure sensors at two ends of the heat regenerator (3), so that the flow resistance loss of the heat regenerator (3) is calculated; the combination of heat exchange capacity and flow resistance loss was used to test the performance of the regenerator (3).
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| CN103837356A (en) * | 2012-11-23 | 2014-06-04 | 中国科学院理化技术研究所 | Testing arrangement of regenerator performance |
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| US8800302B2 (en) * | 2012-07-16 | 2014-08-12 | Sunpower, Inc. | Driving an active vibration balancer to minimize vibrations at the fundamental and harmonic frequencies |
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