JPH11326077A - Heat flux measuring gauge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely measure the heat flux at a local position, e.g. a surface with a curvature or a narrow section, in a heat flux measuring gauge measuring the heat flux via the principle of the unstationary measuring method. SOLUTION: Heat flux is measured by a resistor circuit 4 formed on the upper surface of a cylindrical gauge main body 3 in this heat flux measuring gauge. The heat flux measuring gauge is provided with a lead circuit 5 formed on the side face of the cylindrical gauge main body 3 to be continued to the lower section of the cylindrical gauge main body 3 from the resistor circuit 4 and an instrument connecting socket 7 fitted to the lower section of the cylindrical gauge main body 3 and electrically connected to the lead circuit 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat flux measuring gauge for measuring a heat flux using the principle of an unsteady measuring method.

[0002]

2. Description of the Related Art FIGS. 2A and 2B are schematic diagrams showing a conventional heat flux measuring gauge, in which FIG. 2A is a plan view, FIG. 2B is a transparent perspective view, and FIG. . As shown in FIG. 2 (c), this heat flux measurement gauge is a high-temperature, high-speed flow in a time step like a shock wind tunnel etc. [FIG.
(Indicated by arrow 2 in FIG. 2) can measure the local heat flux of the specimen surface 1 installed in the flow (air flow), and is installed so as to be embedded in the specimen surface 1. You.

The heat flux measuring gauge is shown in FIG.
As shown in (b), a cylindrical gauge body made of ceramics (alumina or the like) (for example, having a diameter of 1.6 mm and a height of 2 mm)
2), a platinum thin film is formed on the upper surface of the cylindrical gauge body 3 by sputtering or the like as shown in FIG. 2 (a), and the platinum coating is subjected to laser trimming. A predetermined electric resistance value (for example, 5
0Ω) to form a resistance circuit 4 (shown by a screen tone in FIG. 2A).

Further, both poles 4A, 4A of this resistance circuit 4
FIG. 2B shows platinum wires (lead wires) 6a, 6a inserted through two through holes 5a, 5a opened in the axial direction of the cylindrical gauge body 3, as shown in FIG. Not connected to the lower extraction measurement circuit. Note that FIG.
2B, the resistance circuit 4 is simplified. Then, a minute current (for example, 5 mA) is applied to the resistance circuit 4 to measure the voltage between the two electrodes 4A, 4A, and the resistance value is measured based on the voltage.

Thus, by measuring the unsteady surface temperature change at the time of step heat input from a high-temperature, high-pressure flow flowing in a step-like manner, the heat flux determined by the magnitude of the temperature change speed can be measured. Has become.

[0006]

FIG. 2 (a)
As shown in the figure, a resistance circuit 4 for measuring such a heat flux
Are formed to have a size of about 0.5 mm square except for the poles 4A, 4A, but the through holes 5a, 5
Since it is necessary to secure the space necessary for the arrangement of a,
As shown in FIG. 2B, the diameter of the cylindrical gauge body 3 is about 1.6 mm. In addition, the cylindrical gauge body 3
Has a height of about 2 mm.

For this reason, in the conventional heat flux measuring gauge,
When measuring the heat flux of curved surfaces and narrow areas,
Due to the size of the cylindrical gauge body 3, that is, the diameter of the cylindrical gauge body 3, there is a problem that an accurate local heat flux cannot be measured. The present invention has been made in view of such a problem, and provides a heat flux measurement gauge capable of reliably measuring a local heat flux such as a curved surface or a narrow portion. Aim.

[0008]

According to the present invention, there is provided a heat flux measuring gauge for measuring a heat flux by a resistance circuit formed on an upper surface of a cylindrical gauge body. A lead circuit formed on a side surface of the cylindrical gauge body so as to continue from the resistance circuit to a lower portion of the cylindrical gauge body; and a lead circuit attached to a lower portion of the cylindrical gauge body and electrically connected to the lead circuit. And a socket for connecting an instrument.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1A and 1B, the heat flux measuring gauge according to one embodiment of the present invention is a high-speed, high-speed flow such as a shock wind tunnel in FIG. 1B. [Indicated by arrow 2],
It is used when measuring the local heat flux on the specimen surface 1 installed in the flow (air flow).

This heat flux measurement gauge is formed by forming a platinum thin film on the upper surface of a cylindrical gauge body 3 (for example, φ0.8 mm, height 2 mm) made of ceramics (alumina, zirconia, etc.) by sputtering or the like. The resistance circuit 4 is formed so as to have a predetermined electric resistance value (for example, 50Ω) by performing laser trimming on the platinum coating film. In the cylindrical gauge body 3 of the present embodiment, a lead circuit 5 such as a band-shaped platinum film or the like is formed on the cylindrical gauge body 3 by sputtering or the like in the same manner as the above-described resistance circuit 4 instead of the conventional two lead wire extraction holes. , 5 are formed, and are connected to both poles 4A, 4A of the resistance circuit 4, respectively.

A lower part of the columnar gauge body 3 is connected to the lead circuits 4, 4 A of the resistance circuit 4 and the lead circuits 5, 5.
Leads 6, 6 for extracting signals guided through
A mounting fixture 7 having a socket structure is provided, and these lead wires 6, 6 are connected to an external measuring device (instrument) (not shown), whereby the lead circuits 5, 5 are electrically connected to the instrument. Have been. Then, signals from the lead circuits 5 and 5 guided to the lower portion of the cylindrical gauge body 3 are guided to lead wires 6 and 6 of the socket 7 and sent to an external measuring device (not shown).

The heat flux measuring gauge according to the present embodiment comprises:
With the above configuration, the following operations,
effective. A very small current (for example, 5 m
A), and the resistance between the two electrodes 4A, 4A is measured to measure the unsteady surface temperature change during the step heat input from the high-temperature and high-pressure flow indicated by arrow 2 in FIG. 1 (b). Based on this, the heat flux entering the surface is measured.

As described above, since the lead is taken out to the lower take-out circuit (not shown) through the lead circuit 5 formed on the inner surface of the cylindrical gauge body 3, the diameter of the cylindrical gauge body 3 is reduced. 0.5 mm square, which is a range in which the resistance circuit 4 for measuring the heat flux is formed, and a small margin can be added to about 0.8 mm,
The miniaturization can be achieved as compared with the related art.

Further, since the electrical connection between the lead circuit and the instrument can be made by attaching the socket to the cylindrical gauge main body, the heat flux measuring gauge can be easily attached and detached. Thus, according to the heat flux measurement gauge according to the present embodiment, there is an advantage that the measurement of the heat flux in a curved surface or a narrow portion, which has been a problem of the conventional heat flux measurement gauge, can be reliably performed.

[0015]

As described in detail above, according to the heat flux measuring gauge of the present invention, since the lead circuit is formed on the side surface of the cylindrical gauge main body, the heat flux measuring gauge can be downsized. Can be achieved. Thereby, there is an advantage that the measurement of the heat flux on the surface having the curvature or the narrow portion can be surely performed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a heat flux measurement gauge according to an embodiment of the present invention, where (a) is a plan view and (b) is a side view.

FIG. 2 is a schematic diagram showing a conventional heat flux measurement gauge;
(A) is its plan view, (b) is its perspective perspective view, (c)
Shows a conceptual diagram of the mounting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Specimen surface 2 High-temperature high-speed flow 3 Cylindrical gauge body 4 Resistance circuit 4A Resistance circuit pole 5 Lead circuit 6 Lead wire 7 Socket (socket for instrument connection)

Claims (1)

[Claims] 1. A heat flux measuring gauge for measuring a heat flux by a resistance circuit formed on an upper surface of a cylindrical gauge body, wherein the cylindrical gauge body is connected to the lower part of the cylindrical gauge body from the resistance circuit. A heat flux measurement gauge, comprising: a lead circuit formed on a side surface of the gauge; and a meter connection socket attached to a lower portion of the cylindrical gauge body and electrically connected to the lead circuit.