CN103713010A - Quick-release testing device and method for measuring heat transfer process under condition of high heat flux density - Google Patents
Quick-release testing device and method for measuring heat transfer process under condition of high heat flux density Download PDFInfo
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- CN103713010A CN103713010A CN201410009208.XA CN201410009208A CN103713010A CN 103713010 A CN103713010 A CN 103713010A CN 201410009208 A CN201410009208 A CN 201410009208A CN 103713010 A CN103713010 A CN 103713010A
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Abstract
The invention relates to a quick-release testing device and method for measuring heat transfer process under the condition of high heat flux density. The quick-release testing device mainly comprises a water pump, a thermostatic cooling liquid storage tank, a vortex flowmeter, a thermometer, an electric control unit (thermocouple digital converter), a gas blast lamp, a square flowing channel and a quick-release heat transfer unit. The water pump, the thermostatic cooling liquid storage tank and the quick-release heat transfer unit are sequentially connected in series to form a test cooling liquid circulation loop. The quick-release heat transfer unit mainly comprises a metal quick-release test piece, a red copper heat-conducting piece, a heat-insulating box body, an organic glass observation window assembly and a sealed tied-up accessory. The quick-release testing device is reasonable in structure design, compact in structure, convenient to use, and metal test pieces can be quickly disassembled and changed. In high-temperature state, excellent sealing effect can be achieved, and the heat load states of various metal test pieces can be accurately tested and evaluated.
Description
Technical field
The present invention relates to a kind of for measuring quick detach test unit and the method for heat transferring of high heat flow density process.
Background technology
Along with improving constantly of diesel engine power, its thermal load and associated reliability problems become more and more outstanding, and the coolant flow process in conventional diesel engine cooling system will be controlled at single-phase flow scope.But along with diesel engine power increases, thermal load constantly increases, and the subcooled boiling phenomenon of liquid coolant is inevitable.Because subcooled boiling has good heat-transfer effect, in the situation that not increasing diesel engine cooling system volume as far as possible, improve the heat transfer efficiency of diesel engine cooling system, employing High-temperature cooling and subcooled boiling cooling technology have been proposed.
High-power diesel engine is under high heat flux, and subcooled boiling diabatic process is inevitably, and this diabatic process has different heat-transfer effects to the liquid coolant of different metal materials and different qualities.In order to study various metal materials and the liquid coolant diabatic process under high heat flux, and the impact on diesel engine performance under high heat flux, set up a kind of for measuring the quick detach test unit of heat transferring of high heat flow density process.Can carry out Quick Measurement and analysis to the heat-transfer effect of different liquid coolants and different metal materials, and can adopt easily the exact instrument such as laser-Doppler or high-speed camera to carry out flow field survey and real-time monitored to the diabatic process under high heat flux.
Summary of the invention
High heat load feature for high-power diesel engine cooling system, the object of the invention is to, for diesel engine cooling system heat transfer research under various high heat load conditions, provides a kind of quick detach Experimental Study of Heat Transfer device that can test various liquid coolants and metal material heat transfer property.To make up, most of heat transfer unit (HTU)s are bulky, heat transfer piece is fixed and should not be dismantled, type of heating is complicated and add the shortcomings such as thermoflux is little.
For achieving the above object, the present invention by the following technical solutions:
Measure a quick detach test unit for diabatic process under high heat flux, mainly by water pump 1, constant temperature liquid coolant storage tank 2, turbo flow meter 5, thermometer 7, ECU (Electrical Control Unit) (thermopair digital quantizer) 13, Gas blowtorch 9, square flow channel 10 and quick detach heat transfer unit 11, formed.Quick detach heat transfer unit 11 is for convenience detach, can change rapidly different metallic test parts 21.Between metal quick detach test block 21 and square flow channel 10, adopt joinery and its construction, can effectively guarantee elevated-temperature seal, make this experimental provision there is very strong versatility.The thermoflux that Gas blowtorch 9 provides can be similar to the thermoflux that replaces engine in-cylinder combustion to discharge, and this type of heating is succinct, avoids adopting large power, electrically firing equipment, and optional equipment is few, convenient operation.
Described water pump 1, constant temperature liquid coolant storage tank 2, eddy-current flowmeter 5, square flow channel 10 and quick detach heat transfer unit 11 adopt stainless-steel tube to be followed in series to form liquid coolant sealing and circulating loop.
Described quick detach heat transfer unit 11 mainly forms (see figure 2) by metal quick detach test block 21, red copper heat-conducting piece 20, thermal-insulating body 14, organic glass observation window 19, sealing fastening assembly 16, fastening bolt 17, trip bolt 18.
The metal quick detach test block 21 of described quick detach heat transfer unit 11 is placed on the pipeline below of square flow channel 10, adopts Tenon sealing surface to connect.Red copper heat-conducting piece 20 is placed on metal quick detach test specimen 21 belows, adopts Tenon sealing surface to connect.Sealing fastening assembly 16 is placed on square flow channel, and Shang Xia 10 both sides, step up metal quick detach test specimen 21, and adopt fastening bolt 17 and trip bolt 18 to be fixed.(see figure 3)
Described thermal-insulating body 14 is wrapped in metal quick detach test specimen 21 and red copper heat-conducting piece 20 outsides, middle fill insulant material 15.
Described organic glass form 19 is embedded into square flow channel 10 two sides, utilizes the clamp region up and down of sealing fastening assembly 16, compresses organic glass form.
Described sealing fastening assembly 16 is comprised of two long-bar metal pieces, upper and lower two clamping plate.Two long-bar metal pieces are placed on the top of square runner 10 upside clamping plate, and fastening bolt 17 is through four bolts hole of long-bar metal piece, and aliging with bolt hole on square runner 10 downside clamping plate, it is fastening to carry out.Play on the one hand the object of fastening organic glass vision panel, also further clamp on the other hand the sealing surface between metal Fast detachable unit 21 and square flow channel 10.
Described ECU (Electrical Control Unit) 13, the temperature consisting of thermopair digital quantizer is controlled and temperature survey ECU (Electrical Control Unit).Adopt the coolant temperature in thermocouple measurement constant temperature liquid coolant storage tank 2, and transmit the thermopair digital quantizer that temperature signal returns ECU (Electrical Control Unit) 13, control liquid coolant heating-up temperature; Adopt metal wall temperature thermocouple 12 to measure the surface temperature of metal quick detach test specimen 21, and be transferred to thermopair digital quantizer, show in real time the surface temperature of metal Fast detachable unit 21.
Described test section adopts square flow channel 10.
Adopt quick detach test unit of the present invention to measure the method for heat transferring of high heat flow density process, step is as follows:
1) the metal quick detach test block (21) that will test is installed in system;
2) by test coolant injection in constant temperature liquid coolant storage tank, open ECU (Electrical Control Unit) power supply, coolant temperature is controlled to the temperature needing, start liquid coolant to heat;
3) when coolant temperature rises to test temperature, open water pump, be adjusted to required test flow, remain to whole system and reach the stable of temperature, pressure;
4) open Gas blowtorch, quick detach heat transfer unit is heated, after stablizing, read the wall temperature T of metal quick detach test block in ECU (Electrical Control Unit)
1, T
2, according to usual method, converse the temperature T of metal Fast detachable unit and liquid coolant surface of contact
w; Record coolant rate, liquid coolant out temperature, the convection transfer rate h of computing system simultaneously.
Test after one group of data, readjust constant temperature liquid coolant storage tank temperature, flow operating parameter, carry out new round test.
In test process, adopt the precision optical instrument of Laser Doppler Velocimeter, high-speed camera to observe and measure information of flow by organic glass form.
Advantage and good effect that the present invention has are:
1. adopt Gas blowtorch type of heating, make heated metal quick detach test block maximum operating temperature can reach 500 ℃, this temperature approaches high-power diesel engine inside wall of cylinder face high-temperature region temperature range substantially, has avoided adopting the bulky power heating equipment of needs such as Electromagnetic Heating.
2. bringing-up section adopts square flow channel, and flow stability is easy to control, and runner both sides are easy to install organic glass vision panel, are conducive to adopt subcooled boiling phenomenon of Heat under the precision optical instrument observation high heat fluxs such as laser-Doppler or high-speed camera.
3. quick detach derby structural design is ingenious, under the cooperation of encapsulation fitting, can fit tightly with square flow channel bottom surface, guarantees the sealing effectiveness under higher temperature.
4. between quick detach derby and red copper heat-conducting block, adopt joinery and its construction, can guarantee close contact between hot conducting surface, guarantee the homogeneity of heat flow density on metal quick detach test block thermal conductive surface.
5. ECU (Electrical Control Unit), possesses manually and automatic control function.Thermopair controller can guarantee that liquid coolant is in temperature constant state; Thermopair digital quantizer can show in real time the wall surface temperature of metal quick detach test block in process of the test.
6. test unit compact conformation, easy to use, has wide range of applications, and can carry out Experimental Study of Heat Transfer performance evaluation to multiple different metal material, different liquid coolant.
Accompanying drawing explanation
Fig. 1: a kind of quick detach test unit of measuring heat transferring of high heat flow density process.
Fig. 2: quick detach heat transfer unit 11.
Fig. 3: quick detach heat transfer unit 11 sectional views.
In figure: 1, water pump; 2, constant temperature liquid coolant storage tank; 3, electric heater; 4 liquid coolant storage tank temperature control thermopairs; 5 turbo flow meters; 6 measuring section inlet and outlet pressure meters; 7 measuring section out temperature meters; 8 vent valves; 9 Gas blowtorches; 10 square flow channels; 11 quick detach heat transfer units; 12 metal wall temperature thermocouples; 13 ECU (Electrical Control Unit) (thermopair digital quantizer); 14 thermal-insulating bodies; 15 insulation materials; 16 sealing fastening assemblies; 17 fastening bolts; 18 trip bolts; 19 organic glass observation windows; 20 red copper heat-conducting pieces; 21 metal quick detach test blocks
Embodiment
With reference to Fig. 1, a kind of quick detach test unit of measuring diabatic process under high heat flux of the present invention is mainly followed in series to form the closed circuit of test liquid coolant by water pump 1, constant temperature liquid coolant storage tank 2, square flow channel 10, quick detach heat transfer unit 11.Turbo flow meter 5, test section inlet and outlet pressure meter 6, test section out temperature meter 7, vent valve 8 are installed successively on described pipeline.
Adopt the liquid coolant in 3 pairs of constant temperature liquid coolant storage tanks 2 of electric heater to enter heating.
In quick detach heat transfer unit bottom, Gas blowtorch 9 is installed, quick detach heat transfer unit is entered to heating.
ECU (Electrical Control Unit) 13 is thermopair digitizer.Convert the detection signal of liquid coolant storage tank temperature control thermopair 4 to digital signal and output on display screen, and realize the automatic control to liquid coolant heating-up temperature by feedback system.Adopt the wall surface temperature of thermocouple measurement metal quick detach test block 21, and convert detection signal to digital signal and output on display screen.
Fig. 2 and Fig. 3 quick detach heat transfer unit 11, mainly consist of metal quick detach test block 21, red copper heat-conducting piece 20, thermal-insulating body 14, insulation material 15, sealing fastening assembly 16, fastening bolt 17, trip bolt 18 and organic glass window assembly 19.
Metal quick detach test block 21 is fitted by the sealed bottom of joinery and its construction and square flow channel 10;
Metal quick detach test block 21 fits tightly by joinery and its construction and red copper heat-conducting piece 20;
Organic glass form 19 is embedded in square flow channel 10 sides, adopts upper lower plate and trip bolt 18 in fastening assembly 16 that organic glass form is fixed on square flow channel 10, forms visual runner.
Sealing fastening assembly 16 connects the clamping plate of organic glass window assembly 19 upper and lower both sides by fastening bolt 17, play on the one hand the object of fastening organic glass vision panel assembly, also can further clamp the sealing surface between metal quick detach test block 21 and square flow channel 10 on the other hand, realize the fastening effect of whole sealing, guaranteed the sealing under hot conditions.
Between thermal-insulating body 14 and metal quick detach test block 21 and red copper heat-conducting piece 20, adopt insulation material 15 to fill, guarantee that heat does not does not scatter and disappear.
Test condition and being described as follows:
Important technological parameters:
1 coolant rate: at 0～8m
3/ h scope is adjustable
2 constant temperature liquid coolant storage tanks are controlled temperature: normal temperature～120 ℃ scope is adjustable
3 system maximum working pressure (MOP): ≮ 0.2MPa
4 metal quick detach test block maximum heating temperatures :≤500 ℃
Above-mentioned test parameters is this device applicable elements.Experimental Study of Heat Transfer under this operating parameter can guarantee consistent with the heat transfer conditions in real engine cooling system.
Principle of work: liquid coolant drives by water pump circulates in the loop of constant temperature liquid coolant storage tank, square flow channel, quick detach heat transfer unit.Adopt Gas blowtorch to heat quick detach heat transfer unit, and by ECU (Electrical Control Unit) controlled circulation coolant temperature.By the air inflow of regulating gas blowtorch, control inputs is to the thermal load of metal quick detach test block.Adopt thermocouple measurement metal Fast detachable unit outside wall surface at a distance of △ X
1-22 temperature T of locating 1, T2, calculate to obtain according to Fourier law (formula 1) and add thermoflux q, and obtain with measurement point 2 at a distance of △ X according to linear extrapolation
2-Wthe metal Fast detachable unit at place and the temperature T of liquid coolant surface in contact
w.Meanwhile, according to Newton's law of cooling, by thermoflux q, metal Fast detachable unit surface temperature T
w, liquid coolant body temperature T
bsubstitution formula (2), the convection transfer rate h of acquisition system.
q=h(T
w-T
b) （2）
Test operation flow process:
The 1 metal quick detach test block that will test is installed in system according to the indication of accompanying drawing 2.
2 by test coolant injection in constant temperature liquid coolant storage tank, open ECU (Electrical Control Unit) power supply, coolant temperature is controlled to the temperature needing, start liquid coolant to heat.
2 when coolant temperature rises to test temperature, opens water pump, is adjusted to required test flow, keeps 15 minutes, makes whole system reach the stable of temperature, pressure.
3 open Gas blowtorch, and quick detach heat transfer unit is heated, and stablize after 15 minutes, read the wall temperature T of metal quick detach test block in ECU (Electrical Control Unit)
1, T
2, according to formula (1), converse the temperature T of metal Fast detachable unit and liquid coolant surface of contact
w.Record coolant rate, liquid coolant out temperature, according to the convection transfer rate h of formula (2) computing system simultaneously.
4 test after one group of data, readjust the operating parameters such as constant temperature liquid coolant storage tank temperature, flow, carry out new round test.
5 in test process, can adopt the precision optical instruments such as Laser Doppler Velocimeter, high-speed camera to observe and measure information of flow by organic glass form.
After 6 tests, first close Gas blowtorch, then close constant temperature liquid coolant storage tank heating power supply, water pump.
Claims (9)
1. one kind for measuring the quick detach test unit of heat transferring of high heat flow density process; It is characterized in that: mainly by water pump (1), constant temperature liquid coolant storage tank (2), turbo flow meter (5), thermometer (7), ECU (Electrical Control Unit) (13), Gas blowtorch (9), square flow channel (10) and quick detach heat transfer unit (11), formed; Water pump (1), constant temperature liquid coolant storage tank (2), eddy-current flowmeter (5), square flow channel (10) and quick detach heat transfer unit (11) adopt stainless-steel tube to be followed in series to form liquid coolant sealing and circulating loop.
2. device as claimed in claim 1, is characterized in that described quick detach heat transfer unit (11) comprises by metal quick detach test block (21), red copper heat-conducting piece (20), thermal-insulating body (14), organic glass observation window (19), sealing fastening assembly (16); Metal quick detach test block (21) is placed on the pipeline below of square flow channel (10), adopts Tenon sealing surface to connect; Heat-conducting piece (20) is placed on metal quick detach test specimen (21) below, adopts Tenon sealing surface to connect; Sealing fastening assembly (16) is placed on the upper and lower both sides of square flow channel (10), steps up metal quick detach test specimen (21), and adopts fastening bolt (17) and trip bolt (18) to fix; Thermal-insulating body (14) is wrapped in metal quick detach test specimen (21) and heat-conducting piece (20) outside, middle fill insulant material layer (15).
3. device as claimed in claim 2, is characterized in that in square flow channel (10) two side, embedding organic glass form (19), utilizes the clamp region up and down of sealing fastening assembly (16), is fixed organic glass vision panel.
4. device as claimed in claim 3, is characterized in that described sealing fastening assembly (16) is comprised of two long-bar metal pieces, upper and lower two clamping plate; Two long-bar metal pieces are placed on the top of square runner (10) upside clamping plate, and fastening bolt (17) is through four bolts hole of long-bar metal piece, and aliging with bolt hole on square runner (10) downside clamping plate, it is fastening to carry out.
5. device as claimed in claim 1, is characterized in that described ECU (Electrical Control Unit) (13), and the temperature consisting of thermopair digital quantizer is controlled and temperature survey ECU (Electrical Control Unit).
6. device as claimed in claim 1, is characterized in that described square flow channel (10) is test section.
7. the method that adopts the quick detach test unit measurement heat transferring of high heat flow density process of claim 1, is characterized in that step is as follows:
1) the metal quick detach test block (21) that will test is installed in system;
2) by test coolant injection in constant temperature liquid coolant storage tank, open ECU (Electrical Control Unit) power supply, coolant temperature is controlled to the temperature needing, start liquid coolant to heat;
3) when coolant temperature rises to test temperature, open water pump, be adjusted to required test flow, remain to whole system and reach the stable of temperature, pressure;
4) open Gas blowtorch, quick detach heat transfer unit is heated, after stablizing, read the wall temperature T of metal quick detach test block in ECU (Electrical Control Unit)
1, T
2, according to usual method, converse the temperature T of metal Fast detachable unit and liquid coolant surface of contact
w; Record coolant rate, liquid coolant out temperature, the convection transfer rate h of computing system simultaneously.
8. method as claimed in claim 7, is characterized in that testing after one group of data, readjusts constant temperature liquid coolant storage tank temperature, flow operating parameter, carries out new round test.
9. method as claimed in claim 7, is characterized in that in test process, adopts the precision optical instrument of Laser Doppler Velocimeter, high-speed camera to observe and measure information of flow by organic glass form.
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| CN104502392A (en) * | 2014-12-02 | 2015-04-08 | 北京空间飞行器总体设计部 | Two-phase fluid loop freezing failure test method |
| CN108119393A (en) * | 2017-09-13 | 2018-06-05 | 中国石油化工股份有限公司 | Based on the seal isolation liquid internal circulating load computational methods under plan54 system configurations |
| CN108759969A (en) * | 2018-05-24 | 2018-11-06 | 新疆中元天能油气科技股份有限公司 | Gas-liquid biphase flowmeter |
| CN108872298A (en) * | 2018-09-05 | 2018-11-23 | 中国科学院工程热物理研究所 | The micro-nano structure surface pool boiling heat transfer device of high heat flux density |
| CN109270293A (en) * | 2018-09-01 | 2019-01-25 | 哈尔滨工程大学 | A kind of PDA measurement window for compressor or other devices |
| CN113030165A (en) * | 2021-03-09 | 2021-06-25 | 西安交通大学 | Rectangular experiment section for high-temperature gas isothermal wall surface cooling experiment |
| CN116499697A (en) * | 2023-06-29 | 2023-07-28 | 中国航空工业集团公司沈阳空气动力研究所 | Wind tunnel inner wing type surface convection heat transfer distribution test measurement device and method |
| CN108759969B (en) * | 2018-05-24 | 2024-04-26 | 新疆中元天能油气科技股份有限公司 | Gas-liquid two-phase flowmeter |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502392A (en) * | 2014-12-02 | 2015-04-08 | 北京空间飞行器总体设计部 | Two-phase fluid loop freezing failure test method |
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| CN113030165A (en) * | 2021-03-09 | 2021-06-25 | 西安交通大学 | Rectangular experiment section for high-temperature gas isothermal wall surface cooling experiment |
| CN116499697A (en) * | 2023-06-29 | 2023-07-28 | 中国航空工业集团公司沈阳空气动力研究所 | Wind tunnel inner wing type surface convection heat transfer distribution test measurement device and method |
| CN116499697B (en) * | 2023-06-29 | 2023-09-12 | 中国航空工业集团公司沈阳空气动力研究所 | Wind tunnel inner wing type surface convection heat transfer distribution test measurement device and method |
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Application publication date: 20140409 |