Total pressure and total temperature measuring device for combustion chamber of small engine
By designing the total pressure and total temperature measurement device of the combustion chamber of a small aircraft engine, using pistol-type total temperature rake and high-temperature alloy materials, the problem of too large and difficult to assemble the total pressure and total temperature measurement device of the small combustion chamber is solved, and efficient and accurate measurement and simplified assembly process is achieved.
Patent Information
- Application Number
- CN202411714977.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-03-11
AI Technical Summary
The total pressure and temperature measurement device of small combustion chamber is too large, difficult to assemble, disassemble, and move. The traditional device is precise and complex, difficult to process and high cost.
A small aircraft engine total pressure and total temperature measurement device is designed, using pistol-type total temperature rake and high-temperature alloy material, and the device is mobility and simplified structure through argon arc welding.
Reliable measurement of the total pressure and total temperature of the outlet of the small combustion chamber is achieved, reducing assembly difficulty and processing costs, and enhancing measurement accuracy and mobility.
Smart Images
Figure CN119595296A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of mechanical structures, and relates to two measurement structures of total pressure and total temperature, and in particular to a dual-purpose measurement structure of total pressure and total temperature of a combustion chamber of a small aircraft engine. Background Art
[0002] The total temperature measuring device is installed on the combustion chamber outlet measuring section and is used to measure the total temperature of the high-temperature combustion gas at a certain position, so as to obtain the circumferential and radial distribution of the combustion chamber outlet temperature, which has a direct impact on the life of the turbine blades.
[0003] The main problem with traditional engine combustion chamber total temperature measurement devices is that when the combustion chamber structure is small, the total temperature measurement space is small; when the measurement device is proportionally reduced, the temperature rake and mounting seat structure are too large to be assembled and cannot meet the test requirements; the precise and complex structural devices are difficult to process and are costly as disposable test pieces. Summary of the invention
[0004] The technical problem to be solved by the present invention is: the present invention provides a small engine combustion chamber total pressure and total temperature measuring device, which solves the problem that the small combustion chamber total pressure and total temperature measuring device is too large, difficult to assemble, difficult to disassemble, and difficult to move, and realizes that the device can measure both total pressure and total temperature.
[0005] The technical solution of the present invention is:
[0006] A device for measuring total pressure and total temperature of a combustion chamber of a small engine, comprising:
[0007] Mounting edge 1, mounting seat 2, total temperature rake 3, thermocouple wire 4, filling seat assembly 5, cover plate 7, support plate 8, pressure-leading pipe 9;
[0008] The mounting edge 1 is connected to the mounting seat 2 below, and the mounting seat 2 is connected to the total temperature rake 3 below; the mounting edge 1, the mounting seat 2, and the total temperature rake 3 are all provided with hole channels inside, and the hole channels are connected to each other, and the thermocouple wire 4 is connected in series in the hole channels inside the mounting edge 4, the mounting seat 2, and the total temperature rake 3; one side of the filling seat assembly 5 is attached to one side of the mounting edge 1 and the mounting seat 2, and the upper edge of the filling seat assembly 5 overlaps the mounting edge 1; the pressure-conducting pipe 9 is connected with the hole channel of the mounting edge 1; a cavity is provided in the total temperature rake 3, and the cavity is connected to the internal hole channel, and a cover plate 7 is provided at the cavity outlet.
[0009] The filling seat assembly 5 and the mounting edge 1 are sealed by a gasket 6 .
[0010] The portion of the total temperature rake 3 extending to the right is longer than the outer edge of the installation side 1 .
[0011] It also includes: a support plate 8 connected to the total temperature rake 3.
[0012] The thermocouple wire 4 uses a K-type thermocouple wire.
[0013] Thermocouple wire 4 with ceramic protective sheath.
[0014] The mounting base 2 and the total temperature rake 3 are welded together by argon arc welding, and the cover plate 7 and the total temperature rake 3 are connected by screws.
[0015] The mounting edge 1, the mounting seat 2, the total temperature rake 3 and the cover plate 7 are all made of high temperature alloy.
[0016] The beneficial effects of this application are:
[0017] When the total temperature of the combustion chamber outlet needs to be measured for the full ring or fan-shaped segment of a small combustion chamber with a high outlet temperature (below 1600°C), this structure can achieve reliable measurement, adjustable structure, good assembly, simple processing and low cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;
[0019] Figure 2 for Figure 1 A cross-sectional view of
[0020] 1—installation edge, 2—installation seat, 3—total temperature rake, 4—thermocouple wire, 5—filling seat assembly, 6—gasket, 7—cover plate, 8—support plate, 9—pressure pipe. DETAILED DESCRIPTION
[0021] The present application is further described in detail below in conjunction with the accompanying drawings of the embodiments.
[0022] A total pressure and total temperature measuring device for a combustion chamber of a small aircraft engine includes a measuring component and a filling component. The measuring component includes a mounting edge, a mounting seat, a total temperature rake, a sealing gasket, a cover plate, a pressure pipe, a thermocouple wire and a support plate; the filling component includes a mounting edge, a filling seat and a gasket. The mounting edge, the mounting seat and a plurality of pressure pipes and a plurality of total temperature rakes of the measuring component are welded together, and the interior is a hole channel with a diameter of 4mm for accommodating thermocouples; the corner of the hole channel of the total pressure and total temperature rake is a rectangular groove, the surface is covered with a sealing gasket and a cover plate, and is fixed to the total pressure and total temperature rake by screws; the total pressure and total temperature rake is a pistol type, and a support plate is welded to the front end of the two total pressure and total temperature rakes; there are bolt holes on the mounting edge of the filling component, which are in the same position as the bolt holes on the mounting edge of the measuring component, and are used to fix the filling component to the measuring component; the two are sealed by a gasket; the filling seat is welded to the mounting edge. During assembly, the measuring component is first assembled on the combustion chamber outlet measuring section substrate, and then the filling component is assembled, and finally fixed by screws.
[0023] The filling seat assembly is a detachable structure, which allows for more space for the assembly of the total pressure and total temperature rake and the mounting seat with a longer axial direction and a higher height. After the subsequent filling seat assembly is assembled, the filling seat fills the flow channel without disturbing the flow field, thereby ensuring the accuracy of the measurement results.
[0024] The filling seat assembly and the measuring assembly share bolt holes for assembly and positioning, thereby achieving the simplest and smallest structure.
[0025] There is a gasket at the mating plane between the filling seat assembly and the measuring seat assembly to ensure sealing.
[0026] The total pressure and total temperature rake has a long axial length, and a thin support plate is added at the front end to reduce rake vibration and enhance measurement accuracy. At the same time, the plate thickness and windward area are kept as small as possible to reduce the impact on the flow field.
[0027] The movable seat base is welded from high-temperature alloy plates to reduce weight, save costs and facilitate assembly.
[0028] The total pressure and total temperature rake, mounting seat, mounting edge, cover plate, etc. are all made of high-temperature alloys to ensure consistent linear expansion coefficient, quality stability, and high temperature resistance.
[0029] The total pressure and total temperature rake is connected to the mounting seat by argon arc welding, which ensures sufficient sealing while reducing the difficulty of processing.
[0030] The interior of the turning position of the total pressure and total temperature rake is a cavity, which is convenient for arranging and disassembling the ceramic jacket outside the thermocouple wire.
[0031] Example
[0032] like Figure 1 , 2 As shown, a total pressure and total temperature measuring device for a combustion chamber of a small aircraft engine comprises a mounting edge 1, a mounting seat 2, a total temperature rake 3, a thermocouple wire 4, a filling seat assembly 5, a gasket 6, a cover plate 7, a support plate 8, and a pressure-inducing pipe 9. The mounting edge 1, the mounting seat 2, the total temperature rake 3, the thermocouple wire 4, the pressure-inducing pipe 9, the cover plate 7, and the support plate 8 together constitute a total pressure and total temperature measuring part, wherein the mounting edge 1, the mounting seat 2, and the total temperature rake 3 are welded together by argon arc welding, the cover plate 7 and the total temperature rake 3 are connected by screws, the support plate 8 and the total temperature rake 3 are connected by argon arc welding, and three thermocouple wires 12 with ceramic protective sleeves pass through the internal hole channel. The filling seat assembly 5 is sealed with the total temperature measuring part by a gasket 6 and connected by bolts.
[0033] Among them, the pressure-leading pipe 9 is connected to the four-way valve through the test pipeline and then connected to the pressure gauge, which can increase the accuracy of the outlet total pressure test measurement.
[0034] Among them, the total temperature rake 3 has a long axial length, leaving enough assembly space for the outlet of the small combustion chamber. In order to avoid large vibration caused by the long length, the support plate 8 can effectively enhance stability.
[0035] Among them, the windward area of the support plate 8 is small enough to save space.
[0036] Among them, the cover plate has a cavity, which is convenient for removing and replacing the K-type thermocouple wire.
[0037] Among them, K-type thermocouple wire can meet the temperature measurement below 1600℃, and the short-term temperature can reach 800℃.
[0038] Among them, sufficient gap can be left between the filling seat assembly and the mounting edge and mounting seat to facilitate assembly, and the flat gasket meets the sealing requirements.
[0039] In addition, the filling seat assembly is welded from a certain thickness of plate, which greatly reduces weight, facilitates installation and reduces costs. Alternatively, the product materials are all high-temperature alloys and can be recycled and reused.
[0040] The design principle of the present invention is:
[0041] The present invention designs a total pressure and total temperature measuring device for a small-sized aircraft engine combustion chamber. Due to the small structure of the combustion chamber, the total pressure and total temperature measuring device has a small space and cannot effectively measure the total pressure at the combustion chamber outlet and the circumferential and radial temperature distribution at the outlet. By setting the total pressure and total temperature rake as a pistol shape, the mobility of the combustion chamber total pressure and total temperature measuring device is achieved, the accuracy and effectiveness of the combustion chamber outlet pressure and temperature measurement are enhanced, and the inaccurate measurement of the combustion chamber outlet total pressure and total temperature due to the small structure size of the combustion chamber is avoided; the measuring component is assembled and welded by a mounting edge, a mounting seat and a total pressure and total temperature rake, and a hole channel for installing a thermocouple wire is arranged inside, and its structural arrangement is convenient for replacing the thermocouple wire; the detachable structure of the filling seat component leaves the total pressure and total temperature rake and the mounting seat with an autonomously controlled space for assembly, which is conducive to the unobstructed flow field of the filling seat flow channel and ensures the accuracy of the measurement result of the total pressure and total temperature at the combustion chamber outlet; the filling seat component and the measuring component share a bolt hole, and the assembly and positioning are simple and quick, which embodies the simplified structure, low process cost and reusability of the combustion chamber total pressure and total temperature device.
[0042] The present invention changes the characteristics of traditional aircraft engine combustion chamber total pressure measuring devices or total temperature measuring devices, which have large structures and complex assembly. The two measuring devices are combined into one, which not only reduces the assembly difficulty of replacing equipment during use, but also reduces the processing difficulty of the combustion chamber total pressure and total temperature measuring device. At the same time, the mobility of the total pressure and total temperature measuring device is increased, solving the problem that the total pressure and total temperature of the combustion chamber of a small aircraft engine cannot be accurately measured.
[0043] The working process of the present invention is as follows:
[0044] During operation, the total pressure and total temperature measuring part is installed on the combustion chamber outlet measuring section mounting seat, the position is adjusted and fixed, and then the gasket 6 and the filling seat assembly 5 are fixed on the mounting seat.
[0045] Priority is given to total pressure measurement. First, connect the test pipeline to the pressure gauge through the pressure pipe 9. Record the local atmospheric pressure and ambient temperature before the test. When measuring the total pressure loss in the cold state under normal pressure, the measuring device is a total pressure rake with 3 measuring points and equal ring arrangement. A water drain with higher accuracy can be connected to this measuring device to measure the total pressure at the outlet.
[0046] Then the total temperature is measured by first inserting the thermocouple wire 4 into the internal hole, adjusting the ceramic jacket in the internal cavity of the cover plate 7, and then tightening the cover plate 7. During the experiment, the thermocouple is connected to the NI data acquisition system through a compensation wire to realize real-time temperature acquisition.
Claims
1. A device for measuring total pressure and total temperature of a combustion chamber of a small engine, characterized in that: include: Mounting edge (1), mounting seat (2), total temperature rake (3), thermocouple wire (4), filling seat assembly (5), cover plate (7), support plate (8), and pressure-conducting pipe (9); The mounting edge (1) is connected to the mounting seat (2) at the bottom, and the mounting seat (2) is connected to the total temperature rake (3) at the bottom; the mounting edge (1), the mounting seat (2), and the total temperature rake (3) are all provided with hole channels inside, and the hole channels are connected to each other, and the thermocouple wire (4) is connected in series in the hole channels inside the mounting edge (1), the mounting seat (2), and the total temperature rake (3); one side of the filling seat assembly (5) is attached to one side of the mounting edge (1) and the mounting seat (2), and the upper edge of the filling seat assembly (5) overlaps the mounting edge (1); the pressure-conducting pipe (9) is connected to the hole channel of the mounting edge (1); a cavity is provided in the total temperature rake (3), and the cavity is connected to the internal hole channel, and a cover plate (7) is provided at the cavity outlet.
2. A small engine combustion chamber total pressure and total temperature measuring device as claimed in claim 1, characterized in that: The filling seat assembly (5) and the mounting edge (1) are sealed via a gasket (6).
3. A small engine combustion chamber total pressure and total temperature measuring device as claimed in claim 1, characterized in that: The portion of the total temperature rake (3) extending to the right is longer than the outer edge of the installation edge (1).
4. A small engine combustion chamber total pressure and total temperature measuring device as claimed in claim 1, characterized in that: Also includes: The support plate (8) is connected to the total temperature rake (3).
5. A small engine combustion chamber total pressure and total temperature measuring device as claimed in claim 1, characterized in that: The thermocouple wire (4) is a K-type thermocouple wire.
6. A small engine combustion chamber total pressure and total temperature measuring device as claimed in claim 5, characterized in that: Thermocouple wire (4) with ceramic protective sheath.
7. A small engine combustion chamber total pressure and total temperature measuring device as claimed in claim 1, characterized in that: The mounting seat (2) and the total temperature rake (3) are welded together by argon arc welding, and the cover plate (7) and the total temperature rake (3) are connected by screws.
8. A small engine combustion chamber total pressure and total temperature measuring device as claimed in claim 1, characterized in that: The mounting edge (1), the mounting seat (2), the total temperature rake (3) and the cover plate (7) are all made of high-temperature alloys.