CN206638415U - The measurement apparatus of casing thermal deformation under a kind of impingement heat transfer - Google Patents
The measurement apparatus of casing thermal deformation under a kind of impingement heat transfer Download PDFInfo
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- CN206638415U CN206638415U CN201720356223.0U CN201720356223U CN206638415U CN 206638415 U CN206638415 U CN 206638415U CN 201720356223 U CN201720356223 U CN 201720356223U CN 206638415 U CN206638415 U CN 206638415U
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- 239000000463 material Substances 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims description 79
- 239000013013 elastic material Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 4
- 239000013536 elastomeric material Substances 0.000 abstract 1
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Abstract
The utility model discloses a kind of measurement apparatus of casing thermal deformation under impingement heat transfer, in the upper and lower ends of experiment casing, auxiliary casing up and down is set respectively, the upper end of the upper auxiliary casing is unconfined free state, and the lower end of lower auxiliary casing is the restrained condition that can be monitored；Multiple heating rings are set to simulate casing internal heat resource in the inner chamber of each casing, the bottom surface of heating unit is provided with high temperature resistant elastomeric material, the heating unit is set to be close to casing inwall under each operating mode, it is zero restriction to casing in total temperature condition range to heat ring, its diameter is slightly less than heating location internal diameter needed for casing, and the thermal coefficient of expansion of its selected materials is less than the thermal coefficient of expansion of casing material, even if at high temperature, heating ring still keeps certain gap with each casing.Casing thermal deformation measurement device under impingement heat transfer of the present utility model, casing institute constrained state under impingement heat transfer can be effectively simulated, effectively simulate and measure temperature field and the casing deformation field of casing.
Description
Technical Field
The utility model relates to a gas turbine and aeroengine technical field especially relate to an adopt turbine casket heat transfer and deformation measurement device of initiative clearance control system.
Background
Under different working states of the gas turbine, the clearance between a casing and a rotor blade is different, for example, the clearance is far larger than the takeoff state under the cruising state, the oil consumption rate can be reduced by 0.8-1% and the exhaust temperature can be reduced to 10 ℃ when the blade tip clearance is reduced by 0.254mm, the oil consumption of an engine can be effectively reduced and the efficiency of the engine can be improved by the blade tip active clearance control technology, so that the exhaust temperature is reduced, the emission of NOx, CO and CO2 is reduced, the cycle life of a hot end component is prolonged, the effective load of a single flight task is improved, and the stall boundary of a high-pressure compressor is widened. The thermal deformation value of the casing under impact heat exchange of the gas turbine adopting the turbine active clearance control system is an important data support for controlling the clearance between the turbine casing and the blade tip of the rotor blade.
With regard to the design scheme of the active clearance control system, NASA proposed a Mechanical active clearance control system (Mechanical ACC, M-ACC) and its improved version in 2003, compared with the traditional method (Thermal ACC, T-ACC) of using cold air to impact-cool the casing, it adopted the hydraulic device, servo motor method, adjusted the radial controllable deformation of the casing and designed the related test scheme in detail, the test scheme considered the temperature field and pressure field, and described the Thermal protection problem of the actuator in detail, and given part of the test data and the problems and solutions in the test in 2005; mattern proposes an electromagnetic actuator, and verifies the effect of the electromagnetic actuator; justak et al have designed a kind of self-adapting double-deck sealing structure which controls the turbine blade tip interval, the outer layer is the segmental sealed surface, as the first level is sealed, the inner layer adopts the flexible metal sheet of the deformable as the second level to seal, it utilizes the pressure drop of the gas in the sealed structure as the adaptive driving force, guarantee to turn the stator interval to keep at 0.127-0.254mm in the whole flight circulation; kniprser et al compared two ACC systems based on mechanical (M-ACC) and cold air (T-ACC), which considers that the T-ACC system is simpler, but the performance gain of the engine from the T-ACC system is not linear, the use of the T-ACC system increases fuel consumption, and the T-ACC system has a slow response speed when applied to closed-loop control due to thermal inertia, increases the possibility of scuffing, and only sacrifices the range of clearance control in order to reduce the possibility of scuffing. The power extracted from the work output of the engine by the M-ACC system can be ignored, and the clearance control range is not required to be sacrificed, so that the M-ACC system is suitable for closed-loop and accurate control. However, after the M-ACC system is used, the casing may have an additional stress from the M-ACC system at high temperature in addition to the internal stress caused by temperature, which may increase the creep of the casing and reduce the cycle life, i.e., after the M-ACC system is used, the fuel economy in a single flight mission is improved, but the cycle life of the hot end components thereof is shortened.
The method is used for researching a core problem in an active clearance control system, namely a temperature field and a displacement field of a receiver under impact heat exchange. In foreign countries, the most representative is research on a high-pressure turbine ACC system of JT9D-70/59, which was conducted by NASA in 1979, in which a sealed support structure is designed and installed inside a high-pressure turbine casing, a rotary gas heating device is used as a heat source to simulate mainstream gas, and under the action of the ACC system, a temperature field of the casing and a deformation field of the casing are measured, and it is found in tests that circumferential thermal deformation is not uniform, the maximum radial thermal deformation is 2.84mm, and the minimum radial thermal deformation is 1.93 mm. However, the cost required for rotating the gas heating device was high, and the constraints on the front and rear ends of the casing were not considered in this test. In China, a model test bed of a controllable deformation casing is designed and built by using a slow-escape jun and the like, a quartz heating pipe is used as a heating device to simulate a main gas flow, the thermal deformation of the casing is measured by using a digital display dial indicator, and the effect verification of an ACC system is carried out.
In summary, in the technical verification tests of the ACC system which have been carried out at home and abroad and provided with concepts and designed test schemes, research focuses on the change rules of the temperature field and the displacement field of the case with or without the ACC system. The test scheme is improved aiming at the constraint problem in the deformation measurement of the casing and the heat source simulation problem in the deformation measurement of the casing, so that the adjustment effect of the active clearance control system on the radial deformation of the casing is verified, and detailed test data is provided for the verification of a design tool and a design method of the active clearance control.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above-mentioned shortcoming and the not enough of prior art, the utility model aims at providing a strike quick-witted casket heat altered shape measuring device under the heat transfer, the device can effectively simulate and strike the confined state that the quick-witted casket receives under the heat transfer to can effectively simulate and measure the temperature field of strikeing the quick-witted casket under the heat transfer, can also effectively measure in addition and strike the quick-witted casket deformation field under the heat transfer. The test scheme is characterized in that the constraint action of the upper end and the lower end of the test casing is considered, on the basis of analyzing the thermal environment of the casing in the ACC system, a mode of combining a heating ring and an automatic temperature control machine is adopted, and a mode of heating at a constant temperature is adopted to simulate mainstream gas.
In order to realize the technical purpose, the utility model discloses the technical scheme who takes is:
a thermal deformation measuring device of a lower impact heat exchange casing comprises a test bed, a test casing, an upper auxiliary casing and a lower auxiliary casing, and is characterized in that,
-the upper end of the testing case is fixedly provided with the upper auxiliary case, and the lower end of the testing case is fixedly provided with the lower auxiliary case, wherein the upper auxiliary case and the testing case, and the lower auxiliary case and the testing case are fixedly connected together through fasteners; an impact type cooling pipeline is arranged on the outer surface of the test case;
the lower end of the lower auxiliary casing is fixedly supported on the bracket of the test bed through a plurality of circumferentially arranged test bars, the upper and lower ends of each test bar are respectively fixedly connected with the lower end of the lower auxiliary casing and the bracket of the test bed, and a strain gauge is adhered to the inner side surface of each test bar;
-providing a plurality of heating rings in the axial direction in the inner cavities of said test, upper and lower auxiliary casings, and individually controlling each heating ring by means of a multi-channel temperature control system, providing a plurality of thermocouples spot-welded to the inner and outer walls of said test, upper and lower auxiliary casings,
wherein,
the heating ring comprises a heating ring support, the heating ring support is of a thin-wall cylindrical structure, a U-shaped groove is formed in the circumferential outer surface of the heating ring support, a heating unit is arranged in the U-shaped groove, and a high-temperature-resistant elastic material is arranged between the heating unit and the bottom surface of the U-shaped groove.
Preferably, the test case, the upper auxiliary case and the lower auxiliary case are coaxially arranged.
Preferably, the heating ring, including the heating ring support, the heating unit and the high temperature resistant elastic material at the bottom of the heating unit, all adopt a split structure.
Preferably, the diameter of the heating ring is smaller than the inner diameter of the required heating position of the casing, and the thermal expansion coefficient of the heating ring is smaller than that of the casing material.
Preferably, a contact type measuring sensor is arranged outside each casing.
The utility model discloses an among the heat altered shape measuring device of machine casket under the impact heat transfer, bury high temperature resistant elastic material in the heating unit lower part, its aim at, after the rising of machine casket temperature and between the heating ring support clearance grow, utilize this high temperature resistant material's elasticity, make the heating unit all hug closely the machine casket inner wall under each operating mode, heat source in the accurate simulation. The utility model discloses an among the impact heat transfer lower cartridge receiver heat altered shape measuring device, take preceding, back both ends at test cartridge receiver direction of admitting air to install supplementary cartridge receiver additional, its purpose is for the structure constraint that accurate analogue test cartridge receiver received under the mounted state and the restraint in temperature field, wherein, goes up the structure constraint state of supplementary cartridge receiver upper end and is free state, and the structure constraint state of supplementary cartridge receiver lower extreme is the constraint state that can monitor down. In order to accurately simulate the constraint state of the test casing, the mounting modes of the upper end and the lower end auxiliary casings, such as the number and the direction of through holes and the pretightening torque of bolts, are consistent with the actual mounting state; the material of the upper and lower auxiliary casings is selected to be consistent with the material of the front and rear casings which are actually installed.
The utility model discloses an among the impact heat transfer lower cartridge receiver heat altered shape measuring device, but to lower supplementary cartridge receiver lower extreme restraint mainly take following means for monitoring state: considering the influence of high temperature, in order to avoid the direct contact between the lower end auxiliary casing and the test bed, a test rod is additionally arranged at the bottom periphery of the test rod for transition; and a strain gauge is adhered to the inner surface of the test rod, and the axial deformation of the test rod monitored by the strain gauge is converted into the radial deformation of the lower end of the lower auxiliary casing through calibration.
Compared with the prior art, the utility model discloses a machine casket heat altered shape measuring device under the impact heat transfer, it is showing the advantage and lies in: (1) the structure constraint of the test case in the prior art is inaccurate, the utility model adopts the mode that the auxiliary case is additionally arranged at the front end and the rear end of the air inlet direction of the test case, so that the structure constraint of the test case in the installation state can be accurately simulated; (2) the restraint of the lower end of the lower auxiliary casing of the utility model is a monitorable state, the lower auxiliary casing is prevented from directly contacting with a test bed in consideration of the influence of high temperature, an additional test rod is adopted as a transition, a strain gauge is pasted in the test rod, and the axial deformation of the test rod monitored by the strain gauge can be converted into the radial deformation of the lower end of the lower auxiliary casing through calibration; (3) the utility model discloses a zero restraint to the machine casket can be realized at full temperature operating mode within range to the heating ring. (4) The utility model discloses well heating ring can be accurate analogue test machine casket's heat source to the constant temperature heating method of machine casket.
Drawings
Fig. 1 is a schematic structural diagram of a thermal deformation measuring device for a receiver under impact heat exchange according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the thermal deformation measuring device for a lower cartridge receiver of impact heat exchange of the present invention includes a test bed 10, a test cartridge receiver 20, an upper auxiliary cartridge receiver 30 and a lower auxiliary cartridge receiver 40. The upper end of the testing casing 20 is fixedly provided with an upper auxiliary casing 30, the lower end of the testing casing 20 is fixedly provided with a lower auxiliary casing 40, the testing casing 20, the upper auxiliary casing 30 and the lower auxiliary casing are coaxially arranged 40, the upper auxiliary casing 30 and the testing casing 20, the lower auxiliary casing 40 and the testing casing 20 are fixedly connected together through fasteners, and the materials of the upper auxiliary casing 30 and the testing casing 20 and the installation state of the lower auxiliary casing 40 and the testing casing 20 are consistent with the actual installation state.
An impact cooling pipeline (not shown in the figure) is arranged on the outer surface of the testing casing 20, the impact cooling pipeline is consistent with the actual installation state, and in addition, a contact type measuring sensor is arranged outside each casing to measure the radial deformation of each casing under various working conditions. The upper end of the upper auxiliary casing 30 is in an unconstrained free state, the lower end of the lower auxiliary casing 40 is fixedly supported on a bracket of the test bed 10 through a plurality of circumferentially arranged test bars 50, the upper end and the lower end of each test bar 50 are respectively and fixedly connected with the lower end of the lower auxiliary casing 40 and the bracket of the test bed 10, a strain gauge 51 is adhered to the inner side surface of each test bar 50, each strain gauge 51 is used for monitoring the axial deformation of each test bar 50, and the axial deformation of each test bar 50 can be converted into the radial deformation of the lower end of the lower auxiliary casing 40.
The utility model discloses take the mode of installing supplementary machine casket additional at both ends around the test machine casket 20 direction of admitting air to the structural constraint and the temperature field constraint that the simulation machine casket received at the mounted state. The constraint state of the upper end and the lower end of the upper auxiliary casing and the lower auxiliary casing is a free state or a monitorable constraint state.
A plurality of heating rings 60 are provided in the inner cavities of the test casing 20, the upper auxiliary casing 30 and the lower auxiliary casing 40 along the axial direction to simulate the internal heat source of the casing, and each heating ring 60 is individually controlled by a multi-channel temperature control system (not shown) to simulate the temperature field of the casing, and thermocouples (not shown) are provided at the inner and outer walls of the test casing 20, the upper auxiliary casing 30 and the lower auxiliary casing 40 by spot welding to measure the temperature field of each casing.
The heating ring 60 includes a heating ring holder 61, and the heating ring holder 61 is a thin-walled cylindrical structure, and is designed to be a thin-walled cylindrical structure for the purpose of facilitating the processing and subsequent adjustment of the entire heating ring. A U-shaped groove is formed in the circumferential outer surface of the heating ring support 61, a heating unit 62 is arranged in the U-shaped groove, and a high-temperature-resistant elastic material 63 is arranged between the heating unit 62 and the bottom surface of the U-shaped groove, so that the heating unit 62 is tightly attached to the inner wall of the casing under all working conditions. The lower part of the heating unit 62 is embedded with a high-temperature resistant elastic material 63, so that the gap between the heating unit and the heating ring bracket is enlarged after the temperature of the casing rises, and the elasticity of the high-temperature resistant material is utilized to ensure that the heating unit is tightly attached to the inner wall of the casing under all working conditions, thereby accurately simulating an internal heat source.
Whole heating ring 60, including the high temperature resistant elastic material 63 of its heating ring support 61, heating element 62 and heating element bottom, all adopt the split structure, its purpose can not warp in order to guarantee after the heating ring support temperature risees, makes things convenient for the heating element to take place to damage the back in time to adjust and change simultaneously to it is even to be favorable to circumference heating temperature. Preferably, the heating ring is free from constraints on each of the casings and functions as a heat source. In addition, in order to achieve the requirement of zero constraint of the heating ring 60 in the full temperature working condition range, the diameter of the heating ring 60 should be slightly smaller than the inner diameter of the heating position required by each casing, and the thermal expansion coefficient of the material selected by the heating ring 60 should be smaller than that of the casing material, so that a certain gap is still kept between the heating ring and each casing at high temperature.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A measuring device for thermal deformation of a lower impact heat exchange casing comprises a test bed, a test casing, an upper auxiliary casing and a lower auxiliary casing, and is characterized in that,
-the upper end of the testing case is fixedly provided with the upper auxiliary case, and the lower end of the testing case is fixedly provided with the lower auxiliary case, wherein the upper auxiliary case and the testing case, and the lower auxiliary case and the testing case are fixedly connected together through fasteners; an impact type cooling pipeline is arranged on the outer surface of the test case;
the lower end of the lower auxiliary casing is fixedly supported on the bracket of the test bed through a plurality of circumferentially arranged test bars, the upper and lower ends of each test bar are respectively fixedly connected with the lower end of the lower auxiliary casing and the bracket of the test bed, and a strain gauge is adhered to the inner side surface of each test bar;
-providing a plurality of heating rings in the axial direction in the inner cavities of said test, upper and lower auxiliary casings, and individually controlling each heating ring by means of a multi-channel temperature control system, providing a plurality of thermocouples spot-welded to the inner and outer walls of said test, upper and lower auxiliary casings,
wherein,
the heating ring comprises a heating ring support, the heating ring support is of a thin-wall cylindrical structure, a U-shaped groove is formed in the circumferential outer surface of the heating ring support, a heating unit is arranged in the U-shaped groove, and a high-temperature-resistant elastic material is arranged between the heating unit and the bottom surface of the U-shaped groove.
2. The apparatus of claim 1, wherein the test case, the upper auxiliary case and the lower auxiliary case are coaxially arranged.
3. The device for measuring thermal deformation of a casing under impact heat exchange of claim 1, wherein the heating ring comprises a heating ring support, a heating unit and a high-temperature-resistant elastic material at the bottom of the heating unit, and the heating ring is of a split structure.
4. A device for measuring thermal deformation of a casing under impact heat exchange as set forth in claim 1, wherein said heating ring has a diameter smaller than the inner diameter of the casing at the desired heating position, and the coefficient of thermal expansion of said heating ring is smaller than the coefficient of thermal expansion of the casing material.
5. The device for measuring thermal deformation of a casing under impact heat exchange of claim 1, wherein a contact type measuring sensor is arranged outside each casing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720356223.0U CN206638415U (en) | 2017-04-06 | 2017-04-06 | The measurement apparatus of casing thermal deformation under a kind of impingement heat transfer |
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| CN201720356223.0U CN206638415U (en) | 2017-04-06 | 2017-04-06 | The measurement apparatus of casing thermal deformation under a kind of impingement heat transfer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840643A (en) * | 2017-04-06 | 2017-06-13 | 中国科学院工程热物理研究所 | The measurement apparatus of casing thermal deformation under a kind of impingement heat transfer |
| CN112855352A (en) * | 2019-11-28 | 2021-05-28 | 中国航发商用航空发动机有限责任公司 | Calculation method and control method for real-time blade tip clearance of high-pressure turbine |
-
2017
- 2017-04-06 CN CN201720356223.0U patent/CN206638415U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106840643A (en) * | 2017-04-06 | 2017-06-13 | 中国科学院工程热物理研究所 | The measurement apparatus of casing thermal deformation under a kind of impingement heat transfer |
| CN106840643B (en) * | 2017-04-06 | 2023-04-18 | 中国科学院工程热物理研究所 | Measuring device for thermal deformation of casing under impact heat exchange |
| CN112855352A (en) * | 2019-11-28 | 2021-05-28 | 中国航发商用航空发动机有限责任公司 | Calculation method and control method for real-time blade tip clearance of high-pressure turbine |
| CN112855352B (en) * | 2019-11-28 | 2022-03-22 | 中国航发商用航空发动机有限责任公司 | Calculation method and control method for real-time blade tip clearance of high-pressure turbine |
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