JPH07146189A - Surface heat flux measuring instrument - Google Patents

Abstract

PURPOSE:To provide a surface heat flux measuring instrument which can measure the surface temperature and heat flux of a heat-resistance material accurately and for a long time and obtain an improved measurement result in real time without spending much time. CONSTITUTION:A plurality of thermocouples 51-53 are buried to a retention member 6 along the depth direction with a specific spacing and a sensor part 1 where a heat-insulating material 7 is provided so that the side surface and the lower surface of the retention member 6 are covered is buried to a heat- resistance material 9 to be measured while only a measurement surface 11 of one edge in the depth direction of the retention member 6 is exposed. The measurement surface 11 of the sensor part 1 and the surface of the heat- resistance material 9 around it are covered with a heat-resistance coating 8, temperature data measured by thermocouples 51-53 of the sensor part 1 are sent to an operation part 3 via a scanner amplifier 2, the operation part 3 calculates the surface temperature and heat flux via heat conduction inverse analysis operation, and then the operation result by the operation part 3 is fed to a display 4 for showing in real time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to surface heat flux measurement applied to development of heat resistant materials and the like.

[0002]

2. Description of the Related Art Recently, a hypersonic aircraft has been developed, and along with this, a heat-resistant material used in such a hypersonic aircraft has been vigorously developed. By the way, in developing such a heat-resistant material, it is essential to measure the surface temperature and heat flux of the heat-resistant material for a long time.
However, the temperature and heat flux cannot be measured directly on the surface of the heat resistant material by the sensor.

This is because when the sensor is embedded in the surface of the heat-resistant material, the sensor itself does not have resistance to heat, the surface emissivity differs between the heat-resistant material and the sensor, and the degree of interaction between the air flow and the surface of the heat-resistant material. Due to different reasons.

However, conventionally, the method shown in FIG. 2 or 3 has been used to measure the surface temperature and heat flux of the heat-resistant material. In FIG. 2, a plurality of thermocouples 21 to 23 are embedded side by side within the heat resistant material 24 at a predetermined distance from the surface, and these thermocouples 21 to 23 continuously change the temperature inside the heat resistant material 24 for a predetermined time. The temperature is measured and the temperature distribution is analyzed based on the measured data to determine the temperature and heat flux of the surface of the heat resistant material 24.

Further, FIG. 3 is applied to the case where only the heat flux of the heat resistant material is measured by using the shock wave wind tunnel, and the thin film gauge 31 in which the thin film gauge 31 is attached to the surface of the thermal resistor 32 is used.
The di-type sensor 30 is embedded in the surface of the heat resistant material 34,
The electrical resistance change of the thin film gauge 31 is measured through the lead wire 33 in a short time of about several msec, and the heat flux on the surface of the heat resistant material 34 is obtained.

[0006]

However, in the method of FIG. 2, a large amount of measurement data is required to obtain the surface temperature and heat flux of the heat resistant material 24, and therefore, the measurement is performed for a long time, Since it is necessary to repeatedly analyze the temperature distribution based on the measured data, it takes a lot of time to obtain the surface temperature and heat flux, and considerable experience is required to improve the accuracy of the measurement results. There was a problem that a measurer having

In the method of FIG. 3, the thin film gauge 31 may not be thermally endured and may be melted when the measurement is performed for a long time, and only the heat flux can be measured by this method. However, there is a problem that the applicable range is limited.

The present invention has been made in view of the above circumstances, and it is possible to measure the surface temperature and heat flux of a heat-resistant material over a long period of time, and obtain a good measurement result in real time without taking time. An object is to provide a bundle measuring device.

[0009]

SUMMARY OF THE INVENTION According to the present invention, a holding member having a known thermophysical property value, a plurality of heat detecting elements embedded along the depth direction of the holding member at predetermined intervals, and the holding member are surrounded. A sensor unit having a heat insulating member provided in
This sensor portion is embedded in the heat insulating material so that one end of the holding member in the depth direction is a measurement surface and the measurement surface is exposed on the surface of the heat insulating material to be measured.

According to the present invention, a holding member having a known thermophysical property value, a plurality of heat detecting elements embedded at predetermined intervals along the depth direction of the holding member, and a heat insulating member provided so as to surround the holding member. And a sensor unit embedded in the heat insulating material so that one end in the depth direction of the holding member is a measurement surface and the measurement surface is exposed on the surface of the heat insulating material to be measured, and the measurement is performed by each of the heat sensing elements A scanner for outputting the temperature data to be output at a predetermined time interval, a calculation means for calculating the surface temperature and the heat flux based on the temperature data from each heat detection element provided by the scanner, and this calculation means. It is composed of display means for displaying the calculation result of.

[0011]

As a result, according to the present invention, a holding member having a known thermophysical property value, a plurality of heat detecting elements embedded at predetermined intervals along the depth direction of the holding member, and the holding member are surrounded. Since the sensor unit having the provided heat insulating member is embedded in the heat insulating material so that one end in the depth direction of the holding member is the measurement surface and the measurement surface is exposed at the surface of the heat insulating material to be measured, Each heat detecting element can accurately detect the surface temperature of the heat insulating material and the heat flow corresponding to the heat flux.

Further, according to the present invention, a holding member having a known thermophysical property value, a plurality of heat detecting elements embedded at predetermined intervals in the depth direction of the holding member, and the holding member are provided so as to surround the holding member. A sensor unit having a heat insulating member is embedded in the heat insulating material so that one end of the holding member in the depth direction is a measurement surface and the measurement surface is exposed on the surface of the heat insulating material to be measured, and each of the heat sensing elements The temperature data measured by the scanner is output at a predetermined time interval by the scanner, the surface temperature and the heat flux are calculated by the calculating means based on the temperature data from each heat detecting element provided by the scanner, and this calculation is performed. Since the calculation result of the means is displayed by the display means, the surface temperature and heat flux of the heat resistant material detected by the sensor unit can be calculated and displayed in real time.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing a schematic configuration of a surface heat flux measuring device in this embodiment.

Reference numeral 1 in FIG. 1 shows a sensor portion of the surface heat flux measuring device according to the present invention. In the sensor section 1, 6 is a heat detecting element holding member made of a material having a known thermophysical property value such as copper, and the holding member 6 has a plurality of heat detecting elements along the depth direction (illustrated example). Then 3)
The thermocouples 51 to 53 are embedded at a predetermined interval. Further, such a holding member 6 is provided with a heat insulating material 7 so as to surround the side surface and the lower surface.

In the sensor portion 1 thus constructed, only the measurement surface 11 at one end in the depth direction of the holding member 6 is exposed and embedded in the heat resistant material 9 to be measured. In this case, the measurement surface 11 of the sensor unit 1 and the surface of the heat resistant material 9 are flush with each other. Then, the measurement surface 1 of the sensor unit 1
Heat-resistant coating 8 on the surface of heat-resistant material 1 and its surroundings
It is covered with. The heat resistant coating 8 has the same emissivity on the surface as the heat resistant material 9.

On the other hand, the thermocouples 51 to 53 of the sensor section 1
The temperature data measured in (1) is sent to the calculation section 3 via the scanner / amplifier 2. The scanner / amplifier 2 outputs the temperature data measured by the thermocouples 51 to 53 at predetermined time intervals, and the arithmetic unit 3 outputs the temperature data from the thermocouples 51 to 53 provided at the predetermined time intervals. The surface temperature and heat flux are calculated through the inverse heat conduction analysis calculation based on the temperature data.

The calculation result of the calculation unit 3 is given to the display unit 4. The display unit 4 displays the calculation result from the calculation unit 3 in real time.

In such a structure, when the surface of the heat-resistant material 9 is exposed to the hypersonic flow, the heat flow H is applied to the surface of the heat-resistant material 9 through the heat-resistant coating 8 in the vertical direction. The heat flow H is also given from the measurement surface 11 of the sensor unit 1 via the heat resistant coating 8 and transmitted to the thermocouples 51 to 53 in the holding member 6, and the temperature data is supplied from the thermocouples 51 to 53, respectively. Detected as.

In this case, since the sensor portion 1 surrounds the periphery of the holding member 6 having a known thermophysical property value with the heat insulating material 7, the heat flow H given to the sensor portion 1 due to the presence of the heat-resistant material 9 from the surroundings. The heat flow in the holding member 6 is made to proceed without being affected, so that the heat flow inside the sensor unit 1 is
It becomes possible to approximate the depth direction of the sensor unit 1. The thermocouples 51 to 53 detect the heat flow corresponding to the depth direction of the sensor unit 1 and output it as temperature data.

The temperature data measured by each of the thermocouples 51 to 53 is output from the scanner / amplifier 2 at a predetermined time interval and sent to the arithmetic unit 3, where the temperature data from each of the thermocouples 51 to 53 is output. -The surface temperature and the heat flux are calculated through the heat conduction inverse analysis calculation based on the data, and the calculation result is sent to the display unit 4 and displayed in real time.

Therefore, according to such an embodiment, a plurality of thermocouples 51 to 5 are formed on the holding member 6 along the depth direction thereof.
3 is embedded at a predetermined interval, and the sensor portion 1 provided with the heat insulating material 7 so as to surround the side surface and the lower surface of the holding member 6 is placed in the heat-resistant material 9 to be measured. By exposing and embedding only 11,
Since the heat flow H given to the sensor unit 1 can be made to travel through the holding member 6, the surface temperature of the heat-resistant material 9 and the heat flow corresponding to the heat flux can be accurately captured by the thermocouples 51 to 53. The surface temperature and heat flux of No. 9 can be measured accurately over a long period of time, and good measurement results can be obtained.

The thermocouples 51 to 53 of the sensor section 1 are also provided.
The temperature data measured in step 2 is sent to the calculation part 3 via the scanner / amplifier 2, and the calculation part 3 calculates the surface temperature and the heat flux through the heat conduction inverse analysis calculation, and the calculation result is displayed on the display part 4. Since it is displayed, the measurement result can be known in real time.

The present invention is not limited to the above-mentioned embodiments, and can be carried out by appropriately modifying it within the scope of the invention.
For example, although three thermocouples are used in the above-described embodiment, any number of thermocouples can be used, and if the number is large, a more accurate measurement result can be obtained.

[0024]

According to the present invention, a holding member having a known thermophysical property value, a plurality of heat detecting elements embedded at predetermined intervals along the depth direction of the holding member, and the holding member are provided so as to surround the holding member. Since the sensor portion having the heat insulating member is embedded in the heat insulating material so that one end in the depth direction of the holding member is the measurement surface and the measurement surface is exposed on the surface of the heat insulating material to be measured, The heat sensing element can accurately detect the surface temperature of the heat insulating material and the heat flow corresponding to the heat flux, and the surface temperature and the heat flux of the heat resistant material can be accurately measured for a long time.

Further, according to the present invention, a holding member having a known thermophysical property value, a plurality of heat detecting elements embedded at predetermined intervals along the depth direction of the holding member, and the holding member are provided so as to surround the holding member. A sensor unit having a heat insulating member is embedded in the heat insulating material so that one end of the holding member in the depth direction is a measurement surface and the measurement surface is exposed on the surface of the heat insulating material to be measured, and each of the heat sensing elements The temperature data measured by the scanner is output at a predetermined time interval by the scanner, the surface temperature and the heat flux are calculated by the calculating means based on the temperature data from each heat detecting element provided by the scanner, and this calculation is performed. Since the calculation result by the means is displayed by the display means, the surface temperature and heat flux of the heat-resistant material detected by the sensor can be calculated and displayed in real time, and the work efficiency for these measurements can be significantly improved. It is possible to above.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the configuration of a surface heat flux measuring device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a conventional method for measuring the surface temperature and heat flux of a heat-resistant material.

FIG. 3 is a diagram showing a conventional method for measuring the heat flux of a heat resistant material.

[Explanation of symbols]

 H ... Heat flow, 1 ... Sensor part, 2 ... Scanner amplifier, 3 ... Arithmetic part, 4 ... Display part, 51 ... Thermocouple, 52 ... Thermocouple, 53 ... Thermocouple, 6 ... Holding member, 7 ... Insulating material, 8 ... Heat resistant coating, 9 ... Heat resistant material, 11 ... Measuring surface, 21 ... Thermocouple, 22 ... Thermocouple, 23 ... Thermocouple, 24 ... Heat resistant material, 30 ... Sensor, 31 ... Thin film gauge, 32 ... Thermal resistor, 33 ... Lead wire, 34 ... Heat resistant material.

Claims (2)

[Claims] 1. A holding member having a known thermophysical property value, a plurality of heat detecting elements embedded at predetermined intervals along the depth direction of the holding member, and a heat insulating member provided so as to surround the holding member. A sensor unit is provided, wherein the sensor unit is embedded in the heat insulating material such that one end in the depth direction of the holding member is a measurement surface and the measurement surface is exposed on the surface of the heat insulating material to be measured. A surface heat flux measuring device. 2. A holding member having a known thermophysical property value, a plurality of heat detecting elements embedded at predetermined intervals in a depth direction of the holding member, and a heat insulating member provided so as to surround the holding member. Then, the one end in the depth direction of the holding member is used as a measurement surface, and the measurement portion is embedded in the heat insulating material so that the measurement surface is exposed to the surface of the heat insulating material to be measured. A scanner which outputs temperature data at a predetermined time interval, a calculation means for calculating the surface temperature and heat flux based on the temperature data from each heat detection element provided by this scanner, and calculation by this calculation means A surface heat flux measuring device, comprising: a display unit for displaying a result.