CN104748371A - Resistive heater used for engine combustion chamber experiment system - Google Patents
Resistive heater used for engine combustion chamber experiment system Download PDFInfo
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- CN104748371A CN104748371A CN201510127330.1A CN201510127330A CN104748371A CN 104748371 A CN104748371 A CN 104748371A CN 201510127330 A CN201510127330 A CN 201510127330A CN 104748371 A CN104748371 A CN 104748371A
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Abstract
The invention discloses a resistive heater used for an engine combustion chamber experiment system. The resistive heater is used for simulating the high temperature, high pressure and high Mach number in supersonic speed and hypersonic speed flying states and the oxygen component in gas and performing experiment research, free of pollution to experiment working media, on hypersonic speed combustion chamber performance so that related problems caused by incoming flow pollution can be evaluated. According to the resistive heater, thin-wall tube heating bodies serving as heating elements are made of high-temperature-resistive alloy steel, an inner barrel and the thin-wall tube heating bodies are fixed inside a heater shell, and the thin-wall tube heating bodies, the inner barrel and the heater shell together form a heating gas duct. When voltage of 380 V is loaded on the thin-wall tube heating bodies, the thin-wall tube heating bodies emit heat, cold air which is heated flows inside and outside through thin-wall tubes for forced-convection heat exchanging, and the outlet temperature can reach 1000 K. The experiment can be performed inside supersonic speed and hypersonic speed air tunnels very close to actual flying conditions. The resistive heater is simple in structure, long in stable operation time and low in operation cost and works continuously.
Description
Technical field
The present invention relates to engine test technical field, specifically, relate to a kind of resistance heater for engine chamber experimental system.
Background technology
In existing disclosed technical literature, the heater for combustion chamber direct-connected experiment system adopts burning heater mostly, and experimental gas has the problem of pollution, and experimental result can not be directly used in the engine performance under assessment practical flight condition.And from open source literature report, the typical resistances heat run system being applied to scramjet engine experimental study at present mainly comprises following kind:
Central fluid research institute of Russia (TASGI) designs the regenerative resistor heater system that stagnation temperature is 1200K, and separate unit power 75kW, but complex structure, price is higher.
The scramjet engine combustion chamber experimental facilities that Virginia, The United States university aerospace research laboratory (Aerospace Research LaboratoryUniversity of Virginia) is developed, this equipment adopts the resistance heater of ten level Four, heater outlet air-flow is pure high temperature air, maximum temperature is 1160K, flow is 0.75kg/s, and power is 1200KW; Combustion chamber import Ma number is 2.1, and stagnation temperature is 1160K, and stagnation pressure is 0.33MPa.This heater is bulky, and heater length is 6.3m, and complex structure, operating cost is higher.
The resistance heater that China's aerodynamic investigation and centre of development, Beijing aerodynamic investigation institute, Nanjing Aero-Space University develop, being limited in scope of simulated flight Mach number, resistance heater outlet temperature does not all reach 1000K, and operating cost is also higher.
Summary of the invention
In order to avoid resistance heating device complex structure, the deficiency that bulky and operating cost is higher that prior art exists, the present invention proposes a kind of resistance heater for engine chamber experimental system, for simulating oxygen components in the high temperature of supersonic speed and hypersonic flight state, high pressure, high Ma number and gas and the free of contamination supersonic combustor performance test research of the working fluid, assessment incoming flow pollutes the relevant issues brought; Resistance heater structure is simple, parallel-adder settle-out time long, work is continuous, operating cost is low.
The technical solution adopted for the present invention to solve the technical problems is: comprise heater housings, inner core, light-wall pipe calandria, flange, firewire electrode, zero wire electrode, be characterized in: adopt light-wall pipe calandria as heating element heater, inner core and light-wall pipe calandria are fixed in heater housings, it is outer that inner core is arranged on light-wall pipe calandria by flange, light-wall pipe calandria and inner core, heater housings forms airflow duct jointly, there is flange at heater housings both ends, the gas outlet of heater case end of body is connected with the pipeline of test section by flange, air inlet on heater case body sidewall is connected with air feed source of the gas, heater housings inwall has insulating barrier, firewire electrode feeder ear is fastened on heater housings by insulated screw, light-wall pipe calandria is connected with power supply by firewire electrode, zero wire electrode is connected in below heater case body sidewall.
Described light-wall pipe calandria adopts high-temperature alloy Steel material.
Described light-wall pipe calandria circumference in inner core is uniform is any one of single or multiple lift structure.
Beneficial effect
A kind of resistance heater for engine chamber experimental system that the present invention proposes, for simulating oxygen components in the high temperature of supersonic speed and hypersonic flight state, high pressure, high Ma number and gas and the free of contamination supersonic combustor performance test research of the working fluid, assessment incoming flow pollutes the relevant issues brought.Resistance heater adopts high-temperature alloy steel to make light-wall pipe calandria as heating element heater, and inner core and light-wall pipe calandria are fixed in heater housings, and light-wall pipe calandria and inner core, heater housings form airflow duct jointly; When the voltage-drop loading of 380V is on light-wall pipe calandria, light-wall pipe calandria is generated heat, carried out forced-convection heat transfer by the cold air heated by flowing inside and outside light-wall pipe, outlet temperature can reach 1000K; Can test in the supersonic speed of closely practical flight condition and hypersonic wind tunnel.
The resistance heater structure that the present invention is used for engine chamber experimental system is simple, and parallel-adder settle-out time is long, and work is continuous, operating cost is low.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, a kind of resistance heater for engine chamber experimental system of the present invention is described in further detail.
Fig. 1 is the resistance heater schematic diagram of the present invention for engine chamber experimental system.
Fig. 2 is resistance heater exit flow temperature survey curve.
Fig. 3 is resistance heated actuator temperature heater outlet parameter measurement curve when being 1000K.
Fig. 4 is resistance heated actuator temperature heater outlet parameter measurement curve when being 900K.
Fig. 5 is resistance heated actuator temperature heater outlet parameter measurement curve when being 700K.
In figure:
1. firewire electrode 2. zero wire electrode 3. heater housings 4. inner core 5. light-wall pipe calandria 6. air inlet 7. gas outlet 8. flange
Detailed description of the invention
The present embodiment is a kind of resistance heater for engine chamber experimental system.
Consult Fig. 1, for the resistance heater of engine chamber experimental system by light-wall pipe calandria 5, inner core 4, heater housings 3, firewire electrode 1, zero wire electrode 2, flange 8, and cold air air inlet 6 and high-temperature gas gas outlet 7 are formed.The air inlet 6 of resistance heater is connected with air feed source of the gas, and the gas outlet 7 of resistance heater is connected with the pipeline of test section by flange 8, air tight under pressure-bearing.Light-wall pipe calandria 5 is connected with 380v power supply by firewire electrode 1.Zero wire electrode 2 is connected to ground connection below heater housings 3 sidewall.Air-flow during test in source of the gas enters into resistance heater from cold air air inlet 6, and the outside wall surface through inner core 4 flows into the airflow duct be jointly made up of with inner core 4, heater housings 3 light-wall pipe calandria 5.Light-wall pipe heater 5 is made up of high temperature alloy Steel material, when voltage-drop loading is on light-wall pipe heater 5, light-wall pipe heater 5 is generated heat, is carried out forced-convection heat transfer by the cold air heated by the inside and outside flowing of light-wall pipe heater 5, flow out from high-temperature gas gas outlet 7.Light-wall pipe calandria 5 intensity is higher, can not stop test in midway under the impact of high-temperature high-speed airflow because heater damages.The version of light-wall pipe calandria 5 has the higher efficiency of heating surface, the mean temperature of light-wall pipe calandria 5 tube wall and the mean temperature difference of air little, lightweight construction; Light-wall pipe calandria 5 thermal capacity is little, and manage inside and outside forced-convection heat transfer with air, its intensification and rate of temperature fall soon, can reach 10 DEG C/S.Inner core 4 is outer at light-wall pipe calandria 5, for fixing light-wall pipe calandria 5, and as the support of light-wall pipe calandria 5, is completely cut off by air simultaneously; Light-wall pipe calandria 5 is circumferential uniform in inner core 4 is single or multiple lift structure, increases the length of its forced-convection heat transfer, makes high temperature gas flow outlet temperature even.Heater housings 3 is the outermost layer of resistance heater, heater housings 3 inwall has insulating barrier, firewire electrode 1 feeder ear is fastened on heater housings 3 by insulated screw, and light-wall pipe calandria 5 is connected with power supply by firewire electrode 1, for the security protection of resistance heater; When resistance heater works, when the air-flow of inner core 4 is heated to 600 DEG C, the surface temperature range of heater housings 3 at 50 DEG C, use safety.
The present embodiment selects intelligent temperature digital PID regulation instrument SR73A and 150kVA controllable silicon power regulator to carry out power control to heater, can realize the manual adjustments to heater, also can automatically adjust according to required temperature.
The key technical indexes that the present embodiment reaches is as follows:
1. electric heater rated power N=125KW.
2. can bear maximum pressure is P
max=3MPa.
3., when power is N=125KW, inlet air temperature is 293K, and when air mass flow is 0.14kg/s, the outlet temperature of heater can reach 1023K; When air mass flow is 0.56kg/s, heater outlet temperature can reach 473K.
Fig. 2 is resistance heater exit flow temperature survey curve under different temperatures in test, and heater outlet temperature is respectively 1000K, 900K, 800K, 700K, and the heating-up time is less than 200 seconds.According to current source of the gas capacity, equipment stable work time can reach 30 seconds.
Fig. 3 ~ Fig. 5 is the experiment curv of resistance heated actuator temperature heater outlet parameter when being respectively 1000K, 900K, 700K.The resistance heater of system completes the Related Experimental Study of a large amount of scramjet engine combustion chamber by experiment.And can test in the supersonic speed of closely practical flight condition and hypersonic wind tunnel.
Claims (3)
1. the resistance heater for engine chamber experimental system, comprise heater housings, inner core, light-wall pipe calandria, flange, firewire electrode, zero wire electrode, it is characterized in that: adopt light-wall pipe calandria as heating element heater, inner core and light-wall pipe calandria are fixed in heater housings, it is outer that inner core is arranged on light-wall pipe calandria by flange, light-wall pipe calandria and inner core, heater housings forms airflow duct jointly, there is flange at heater housings both ends, the gas outlet of heater case end of body is connected with the pipeline of test section by flange, air inlet on heater case body sidewall is connected with air feed source of the gas, heater housings inwall has insulating barrier, firewire electrode feeder ear is fastened on heater housings by insulated screw, light-wall pipe calandria is connected with power supply by firewire electrode, zero wire electrode is connected in below heater case body sidewall.
2. the resistance heater for engine chamber experimental system according to claim 1, is characterized in that: described light-wall pipe calandria adopts high-temperature alloy Steel material.
3. the resistance heater for engine chamber experimental system according to claim 1, is characterized in that: uniform any one for single or multiple lift structure of described light-wall pipe calandria circumference in inner core.
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| CN201510127330.1A CN104748371A (en) | 2015-03-23 | 2015-03-23 | Resistive heater used for engine combustion chamber experiment system |
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| CN201510127330.1A CN104748371A (en) | 2015-03-23 | 2015-03-23 | Resistive heater used for engine combustion chamber experiment system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106352545A (en) * | 2016-08-30 | 2017-01-25 | 镇江裕太防爆电加热器有限公司 | Tubular heating element |
| CN106382742A (en) * | 2016-08-30 | 2017-02-08 | 镇江裕太防爆电加热器有限公司 | Efficient air heater |
| CN108072172A (en) * | 2016-11-16 | 2018-05-25 | 上海韵申新能源科技有限公司 | A kind of direct-type efficient electric heater |
| CN108688005A (en) * | 2018-05-23 | 2018-10-23 | 宁波诺博特机械有限公司 | A kind of airflow heating device |
| CN109682065A (en) * | 2018-12-17 | 2019-04-26 | 大连理工大学 | A kind of combined type quick high-pressure gas-heating apparatus |
| CN110068140A (en) * | 2019-03-19 | 2019-07-30 | 南京航空航天大学 | A kind of approximation isothermal wall pipe is interior to heat high-temperature air heater |
| CN111457585A (en) * | 2020-03-27 | 2020-07-28 | 中国航天空气动力技术研究院 | High-temperature pure air heater |
| CN112601308A (en) * | 2020-12-16 | 2021-04-02 | 北京航天益森风洞工程技术有限公司 | Combined induction heating system for heating large-flow air |
| CN113251656A (en) * | 2021-06-03 | 2021-08-13 | 中国空气动力研究与发展中心高速空气动力研究所 | Hollow resistance tube directly-heated electric heater |
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| CN106352545A (en) * | 2016-08-30 | 2017-01-25 | 镇江裕太防爆电加热器有限公司 | Tubular heating element |
| CN106382742A (en) * | 2016-08-30 | 2017-02-08 | 镇江裕太防爆电加热器有限公司 | Efficient air heater |
| CN108072172A (en) * | 2016-11-16 | 2018-05-25 | 上海韵申新能源科技有限公司 | A kind of direct-type efficient electric heater |
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| CN108688005A (en) * | 2018-05-23 | 2018-10-23 | 宁波诺博特机械有限公司 | A kind of airflow heating device |
| CN109682065A (en) * | 2018-12-17 | 2019-04-26 | 大连理工大学 | A kind of combined type quick high-pressure gas-heating apparatus |
| CN110068140A (en) * | 2019-03-19 | 2019-07-30 | 南京航空航天大学 | A kind of approximation isothermal wall pipe is interior to heat high-temperature air heater |
| CN111457585A (en) * | 2020-03-27 | 2020-07-28 | 中国航天空气动力技术研究院 | High-temperature pure air heater |
| CN111457585B (en) * | 2020-03-27 | 2021-10-01 | 中国航天空气动力技术研究院 | High-temperature pure air heater |
| CN112601308A (en) * | 2020-12-16 | 2021-04-02 | 北京航天益森风洞工程技术有限公司 | Combined induction heating system for heating large-flow air |
| CN113251656A (en) * | 2021-06-03 | 2021-08-13 | 中国空气动力研究与发展中心高速空气动力研究所 | Hollow resistance tube directly-heated electric heater |
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Application publication date: 20150701 |