阅读说明：本技术 燃烧室出口总温探针 (Total temperature probe for outlet of combustion chamber ) 是由 王凯歌 吴超 汪雅玲 汪林全 李霞 刘翔 杨宏鸿 于 2021-08-31 设计创作，主要内容包括：本发明提供了一种燃烧室出口总温探针,包括探针支杆,探针支杆头部设有整流隔热罩、屏蔽罩,整流隔热罩与探针支杆之间沿周向有缝隙,屏蔽罩固定于探针支杆前端,并伸出整流隔热罩,屏蔽罩前端设有进气孔,进气孔内设有热电偶；探针支杆后部设有冷却气进口、进水口和出水口,探针支杆内设有冷却气管、进水缝隙和出水缝隙,冷却气管连通冷却气进口和整流隔热罩,探针支杆头部内的通水槽两端连通进水缝隙与出水缝隙。采用本发明,防止探针支杆头部外侧烧蚀；通过屏蔽罩、整流隔热罩,使测点的温度场不受冷却结构影响,冷却对屏蔽罩和测点的热传导误差明显得到改善,实现了高性能燃烧室出口燃气的准确测量。(The invention provides a total temperature probe for an outlet of a combustion chamber, which comprises a probe supporting rod, wherein the head part of the probe supporting rod is provided with a rectifying heat-insulating cover and a shielding cover, a gap is formed between the rectifying heat-insulating cover and the probe supporting rod along the circumferential direction, the shielding cover is fixed at the front end of the probe supporting rod and extends out of the rectifying heat-insulating cover, the front end of the shielding cover is provided with an air inlet, and a thermocouple is arranged in the air inlet; the rear part of the probe supporting rod is provided with a cooling air inlet, a water inlet and a water outlet, a cooling air pipe, a water inlet gap and a water outlet gap are arranged in the probe supporting rod, the cooling air pipe is communicated with the cooling air inlet and the rectification heat insulation cover, and two ends of a water through groove in the head part of the probe supporting rod are communicated with the water inlet gap and the water outlet gap. By adopting the invention, the ablation of the outer side of the head of the probe supporting rod is prevented; the shield cover and the rectification heat insulation cover are used for preventing the temperature field of the measuring point from being influenced by the cooling structure, so that the heat conduction error of the shield cover and the measuring point is obviously improved by cooling, and the accurate measurement of the high-performance combustion chamber outlet gas is realized.)

1. The utility model provides a total temperature probe in combustor export which characterized in that: the probe comprises a probe supporting rod (1), wherein the middle part of the probe supporting rod (1) is provided with an installation part (2);

the probe supporting rod (1) is provided with a rectification heat insulation cover (3) and a shielding cover (4) at the head part, a gap is arranged between the rectification heat insulation cover (3) and the probe supporting rod (1) along the circumferential direction, the rear end of the shielding cover (4) is fixed at the front end of the probe supporting rod (1), the front end of the shielding cover (4) extends out of the rectification heat insulation cover (3), an air inlet hole (5) is arranged at the front end of the shielding cover (4) in the forward direction, and a thermocouple (6) is arranged in the air inlet hole (5);

the probe supporting rod (1) rear portion is equipped with cooling gas inlet (7), water inlet (8) and delivery port (9), be equipped with cooling gas pipe (10) in the probe supporting rod (1), intake gap (11) and play water gap (12), cooling gas pipe (10) one end intercommunication cooling gas inlet (7), the other end intercommunication rectification separates heat exchanger (3) inside, intake gap (11) intercommunication water inlet (8), play water gap (12) intercommunication delivery port (9), be equipped with in probe supporting rod (1) head and lead to basin (13), lead to basin (13) both ends and communicate respectively and intake gap (11) and play water gap (12).

2. The combustor exit total temperature probe of claim 1, wherein: the thermocouple (6) adopts a thermocouple wire of iridium rhodium 40-iridium rhodium 10.

3. A combustor exit total temperature probe as set forth in claim 2, wherein: and a high-temperature resistant coating layer is arranged on the exposed part of the thermocouple (6).

4. The combustor exit total temperature probe of claim 1, wherein: an exhaust hole (15) is further formed in the shielding cover (4) in the transverse direction, the exhaust hole (15) is communicated with the air inlet hole (5), and the exhaust hole (15) is opposite to the middle of the thermocouple (6).

5. The combustor exit total temperature probe of claim 4, wherein: the number of the exhaust holes (15) is (2), and the exhaust holes are positioned on two sides of the thermocouple (6).

6. The combustor exit total temperature probe of claim 1 or 4, wherein: the length-diameter ratio of the shielding cover (4) is more than or equal to 5.

7. The combustor exit total temperature probe of claim 6, wherein: the number of the shielding covers (4) is at least (2), and the shielding covers are respectively a noble metal shielding cover (16) and a ceramic shielding cover (17).

8. The combustor exit total temperature probe of claim 7, wherein: the rear portion of the ceramic shielding case (17) is provided with a limiting structure and a fixing clamp ring (18), the limiting structure is connected with the fixing clamp ring (18) in a clamped mode, and the fixing clamp ring (18) is welded with the front end of the probe supporting rod (1).

9. The combustor exit total temperature probe of claim 1, wherein: the front end of the rectification heat shield (3) is arc-shaped, and a thermal barrier coating is coated on the rectification heat shield (3).

10. A combustor exit total temperature probe as set forth in claim 1 or 9, wherein: a plurality of clamping pins (19) are circumferentially distributed on the rectifying heat shield (3), and the rectifying heat shield (3) is clamped with the probe supporting rod (1) through the clamping pins (19).

Technical Field

The invention relates to the technical field of high-temperature airflow testing of aero-engines, in particular to a total temperature probe for an outlet of a combustion chamber.

Background

With the development of advanced aero-engine technology, the test working condition of the main combustion chamber of the next generation of high-temperature-rise and high-performance aero-engine reaches over 2200K, which is far beyond the capability range of the existing high-temperature gas measurement. How to realize the contact measurement of the high-temperature airflow at the outlet of the combustion chamber of the next generation and reliably and accurately master the distribution condition of the temperature of the airflow at the outlet of the combustion chamber is an urgent technical problem at present.

The outlet temperature of the next generation combustion chamber is high, the pressure is high, the test space is narrow and small, the structure is complex, and the risk is high. The upper limit of temperature measurement of a high-temperature probe which is used in China at present and is matched with a platinum-rhodium 40-platinum-rhodium 20 thermocouple is only about 2000K, the double-platinum-rhodium thermocouple wire material in a local hot spot area is frequently subjected to high-temperature fusing, the high-temperature probe cannot bear the measurement work of higher high-temperature airflow, and meanwhile, the temperature measurement error caused by a probe cooling structure is large, and data cannot be directly used. In addition, when the probe cooling structure brings temperature measurement errors, the temperature of the head of the probe supporting rod is increased, so that the probe supporting rod cannot be effectively protected, ablation damage is caused, and the probe cooling structure cannot be used for a long time.

Disclosure of Invention

In order to solve the technical problem, the invention provides a total temperature probe for an outlet of a combustion chamber.

The invention is realized by the following technical scheme.

The invention provides a total temperature probe for an outlet of a combustion chamber, which comprises a probe supporting rod, wherein an installation part is arranged in the middle of the probe supporting rod;

the probe supporting rod is provided with a rectification heat insulation cover and a shielding cover at the head part, a gap is arranged between the rectification heat insulation cover and the probe supporting rod along the circumferential direction, the rear end of the shielding cover is fixed at the front end of the probe supporting rod, the front end of the shielding cover extends out of the rectification heat insulation cover, the front end of the shielding cover is provided with an air inlet hole in the forward direction, and a thermocouple is arranged in the air inlet hole;

the probe supporting rod is provided with a cooling air inlet, a water inlet and a water outlet at the rear part, a cooling air pipe, a water inlet gap and a water outlet gap are arranged in the probe supporting rod, one end of the cooling air pipe is communicated with the cooling air inlet, the other end of the cooling air pipe is communicated with the inside of the rectification heat insulation cover, the water inlet gap is communicated with the water inlet, the water outlet gap is communicated with the water outlet, a water passing groove is arranged in the head part of the probe supporting rod, and two ends of the water passing groove are respectively communicated with the water inlet gap and the water outlet gap.

The thermocouple adopts a thermocouple wire of iridium rhodium 40-iridium rhodium 10.

And the exposed part of the thermocouple is provided with a high-temperature resistant coating layer.

The lotus root silk has a diameter of 0.5 mm.

An exhaust hole is further formed in the shielding cover in the transverse direction and is communicated with the air inlet hole, and the exhaust hole is opposite to the middle of the thermocouple.

The number of the exhaust holes is 2, and the exhaust holes are positioned on two sides of the thermocouple.

The area ratio of the air inlet hole to the air outlet hole is 1.04.

The diameter of the vent hole is 1.8 mm.

The length-diameter ratio of the shielding case is more than or equal to 5.

The number of the shielding covers is at least 2, and the shielding covers are respectively a noble metal shielding cover and a ceramic shielding cover.

The rear portion of the ceramic shielding cover is provided with a limiting structure and a fixing clamp ring, the limiting structure is connected with the fixing clamp ring in a clamped mode, and the fixing clamp ring is welded with the front end of the probe support rod.

The front end of the rectification heat shield is arc-shaped, and a thermal barrier coating is coated on the rectification heat shield.

A plurality of clamping pins are circumferentially distributed on the rectification heat shield, and the rectification heat shield is clamped with the probe supporting rod through the clamping pins.

And guide plates are also arranged in the water inlet gap and the water outlet gap and are positioned at the head parts of the probe supporting rods.

The invention has the beneficial effects that:

by adopting the probe head cooling device, the cooling of the probe head is a composite form of water cooling and air cooling, so that the cooling effect is improved; the cooling gas integrally reduces the temperature of the probe head inside the rectification heat shield, reduces the cooling water load, reduces the pressure in the support rod caused by the temperature rise of the cooling water, and ensures the strength; cooling air is discharged from a gap between the rectification heat shield and the probe supporting rod, so that the head of the probe supporting rod is protected by a barrier, and the outer side of the head of the probe supporting rod is prevented from being ablated; the shielding cover reduces the situation of high-temperature fusing of the thermocouple wires, the thermocouple is far away from the head of the probe supporting rod through the shielding cover and is isolated by the rectification heat-insulation cover, so that the temperature field of the measuring point is not influenced by a cooling structure, the heat conduction error of the shielding cover and the measuring point is obviously improved through cooling, and the accurate measurement of the high-performance combustion chamber outlet gas is realized.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a detailed view of part M of fig. 1.

Fig. 4 is a sectional view taken along line a-a of fig. 1.

Fig. 5 is a sectional view of the portion B-B of fig. 1.

Fig. 6 is a sectional view of the portion C-C of fig. 1.

Figure 7 is a schematic view of a baffle configuration inside a probe strut.

In the figure: 1-a probe support bar; 2-an installation part; 3-a fairing heat shield; 4-a shielding case; 5-air inlet holes; 6-a thermocouple; 7-cooling gas inlet; 8-a water inlet; 9-water outlet; 10-cooling the air pipe; 11-water inlet gap; 12-water outlet gap; 13-water trough; 14-a baffle; 15-air vent; 16-noble metal shielding; 17-a ceramic shield; 18-fixing a snap ring; 19-Bayonet.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.

As shown in FIGS. 1 to 6, the structure of the present invention is schematically illustrated:

the invention provides a total temperature probe for an outlet of a combustion chamber, which comprises a probe supporting rod 1, wherein an installation part 2 is arranged in the middle of the probe supporting rod 1;

the probe supporting rod 1 is provided with a rectification heat shield 3 and a shielding cover 4 at the head part, a gap is arranged between the rectification heat shield 3 and the probe supporting rod 1 along the circumferential direction, the rear end of the shielding cover 4 is fixed at the front end of the probe supporting rod 1, the front end of the shielding cover 4 extends out of the rectification heat shield 3, the front end of the shielding cover 4 is provided with an air inlet 5 in the forward direction, and a thermocouple 6 is arranged in the air inlet 5;

the rear portion of the probe supporting rod 1 is provided with a cooling air inlet 7, a water inlet 8 and a water outlet 9, a cooling air pipe 10, a water inlet gap 11 and a water outlet gap 12 are arranged in the probe supporting rod 1, one end of the cooling air pipe 10 is communicated with the cooling air inlet 7, the other end of the cooling air pipe is communicated with the inside of the rectification heat insulation cover 3, the water inlet gap 11 is communicated with the water inlet 8, the water outlet gap 12 is communicated with the water outlet 9, a water through groove 13 is arranged in the head portion of the probe supporting rod 1, and two ends of the water through groove 13 are respectively communicated with the water inlet gap 11 and the water outlet gap 12.

The principle is as follows: the mounting part 2 is used for mounting the total temperature probe at the outlet of the combustion chamber, when the device works, the cooling of the head part of the probe is a water-cooling and air-cooling composite form, cooling water forms a loop through a water inlet 8, a water inlet gap 11, a water trough 13, a water outlet gap 12 and a water outlet 9, a cooler enters the rectification heat shield 3 through a cooling gas inlet 7 and a cooling gas pipe 10 and is discharged from a gap between the rectification heat shield 3 and the probe supporting rod 1, and the discharging direction is along the gas direction at the outlet of the combustion chamber, so that the discharged cooling gas has a barrier protection effect on the head part of the probe supporting rod 1.

By adopting the probe head cooling device, the cooling of the probe head is a composite form of water cooling and air cooling, so that the cooling effect is improved; the cooling gas integrally reduces the temperature of the probe head inside the rectification heat shield 3, reduces the cooling water load, reduces the pressure in the support rod caused by the temperature rise of the cooling water, and ensures the strength; cooling air is discharged from a gap between the rectification heat shield 3 and the probe supporting rod 1, so that the head of the probe supporting rod 1 is protected by a barrier, and the outer side of the head of the probe supporting rod 1 is prevented from being ablated; the shielding cover 4 reduces the situation of high-temperature fusing of the thermocouple wires, the thermocouple 6 is far away from the head of the probe supporting rod 1 through the shielding cover 4 and is isolated by the rectification heat-insulation cover 3, so that the temperature field of the measuring point is not influenced by a cooling structure, the heat conduction error of the shielding cover 4 and the measuring point due to cooling is obviously improved, and the accurate measurement of the high-performance combustion chamber outlet gas is realized.

The thermocouple 6 adopts a thermocouple wire of iridium rhodium 40-iridium rhodium 10. The maximum long-term use temperature of the thermocouple 6 is 2273K, the maximum short-term use temperature is 2373K, and the allowable error is +/-0.4% t in the temperature measurement range; through the arrangement, the situation of high-temperature fusing of the thermocouple wire is avoided, the contactable measurement of high-temperature airflow at the outlet of the next generation combustion chamber is realized, and the temperature measurement data is reliable and accurate.

And the exposed part of the thermocouple 6 is provided with a high-temperature resistant coating layer. Researches find that the iridium material can volatilize under a high-temperature oxidation environment, and meanwhile, if the measured fuel gas contains more incompletely combusted components, the surface of the wire couple can be carburized, so that the wire couple is easy to break; therefore, through coating, the surface carburization and the volatilization of iridium materials of the couple wire are prevented, and the long-term use of the couple wire is ensured without fracture.

The lotus root silk has a diameter of 0.5 mm.

As shown in fig. 3: an exhaust hole 15 is further formed in the shielding cover 4 in the transverse direction, the exhaust hole 15 is communicated with the air inlet 5, and the exhaust hole 15 is opposite to the middle of the thermocouple 6. The gas at the outlet of the combustion chamber enters from the gas inlet 5 and exits from the gas outlet 15, so that the gas flow at the measuring point of the thermocouple 6 is consistent with the gas at the outlet of the combustion chamber, and the measurement error is reduced.

The number of the exhaust holes 15 is 2, and the exhaust holes are positioned on two sides of the thermocouple 6.

The area ratio of the air inlet holes 5 to the air outlet holes 15 is 1.04. The internal flow speed of the shielding case 4 is increased, and then the convection heat exchange between the couple wire and the fuel gas is enhanced.

The diameter of the vent hole 15 is 1.8 mm.

The length-diameter ratio of the shielding case 4 is more than or equal to 5.

The number of the shielding cases 4 is at least 2, and the shielding cases are respectively a noble metal shielding case 16 and a ceramic shielding case 17.

Wherein, the noble metal shielding cover 16 is made of platinum-iridium noble metal; the ceramic shield 17 is made of yttria ceramic. The reliability of the shield cover 4 is improved, and the shield cover can work in the main combustion chamber of the next generation of high-temperature-rise and high-performance aircraft engine for a long time.

The rear portion of the ceramic shielding case 17 is provided with a limiting structure and a fixing clamp ring 18, the limiting structure is clamped with the fixing clamp ring 18, and the fixing clamp ring 18 is welded with the front end of the probe support rod 1.

The front end of the rectification heat shield 3 is arc-shaped, and a thermal barrier coating is coated on the rectification heat shield 3. As shown in FIGS. 4-5: the arc shape is convenient for the gas at the outlet of the combustion chamber to smoothly flow through, the resistance is reduced, the influence of the gas disturbance on the temperature field of the measuring point is reduced, the influence of the cooling structure on the temperature field of the measuring point of the thermocouple 6 is further reduced by the thermal barrier coating, and the reliability of the measured data is improved.

A plurality of bayonet locks 19 are circumferentially distributed on the rectifying heat-insulating cover 3, and the rectifying heat-insulating cover 3 and the probe supporting rod 1 are clamped through the bayonet locks 19.

As shown in fig. 7: and guide plates 14 are also arranged in the water inlet gap 11 and the water outlet gap 12, and the guide plates 14 are positioned at the head part of the probe supporting rod 1. Further improving the cooling efficiency.