JP3140543B2 - Flame velocity measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame propagation velocity measuring device using an ultraviolet ray detector.

[0002]

2. Description of the Related Art The most typical laminar premixed flame in which fuel and air are preliminarily mixed to a uniform composition having a flammable concentration and are ejected from a burner to burn is a conical flame formed by a Bunsen burner. The flame propagation speed of such a laminar premixed flame has been conventionally measured by a photographic method.

FIG. 5 is a sectional view showing an example of a flame related to the measurement of the flame propagation speed by the photographic method. In the drawing, a is a burner, b is a flame in which a premixed gas in which fuel and air are preliminarily mixed in a flammable concentration uniform composition is ejected from the burner a and burned, and c is a flame surface of the flame b.

The unburned premixed gas flows at an angle of α with respect to the flame surface c at a speed indicated by an arrow Uu in FIG.
This is divided into a speed component Su perpendicular to the flame surface c and a speed component SII parallel to the flame surface c. Note that α is obtained by photographing.

In this case, the flame propagation speed is Su = Uu · s
It is represented by inα.

Where: Su; flame propagation speed (m / sec) Uu; speed of premixed gas (m / sec) α; angle between flame surface and Uu component (゜)

[0007]

However, the measurement of the flame propagation velocity by the above-mentioned photographic method is effective when a stable flame front c such as the laminar premixed flame b exists, There was a problem that it was not applicable in principle to the measurement of the flame propagation speed.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a flame propagation velocity measuring device capable of measuring the propagation velocity of a diffusion flame by using an ultraviolet detector.

[0009]

Means for Solving the Problems To achieve the above object,
Therefore, the flame propagation speed measuring device of the present invention
At predetermined intervals with respect to
At least two ultraviolet detectors capable of detecting ultraviolet light emitted from a flame , and each of the ultraviolet detectors is housed and has an obstacle to detection.
An adapter that blocks a harmful light beam, a communication unit that transmits an ultraviolet detection signal transmitted by the ultraviolet detector, a memory scope that can display the ultraviolet detection signal transmitted by the communication unit, and an ultraviolet detector. Intervals and communication means
Based on the transmission time difference of each UV detection signal transmitted by
An arithmetic unit for calculating the flame propagation speed .

[0010]

In the flame propagation velocity measuring device of the present invention,
Ultraviolet light emitted from the flame is detected by multiple ultraviolet detectors.
And an ultraviolet detector on the upstream side in the flame propagation direction emits
UV detection signal and flame than the UV detector
UV detection emitted by the UV detector downstream of the propagation direction
The signal is displayed on the memory scope and displayed on the calculator.
Therefore, the flame propagation speed, the distance between the two ultraviolet detectors, and
It is obtained from the transmission time difference of the ultraviolet detection signal.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram of a flame propagation velocity measuring apparatus according to the present invention, FIG. 2 is a cross-sectional view schematically showing an ultraviolet detector related to FIG. 1, and FIG. 3 is a diagram showing an actual ATR (air turbo ram jet) engine. FIG. 4 is a view showing a display example of an ultraviolet detection signal of the memory scope related to FIG. 1.

As shown in FIG. 1, two ultraviolet detectors 1 and 2 are arranged at a predetermined interval (140 mm in the embodiment) with respect to the propagation direction of the flame 3, and , 2, UV detection signal 1a to which they are calling, 2a
Amplifying the and connecting the communication means 4 for transmitting.

The communication means 4 comprises the ultraviolet detectors 1 and
2 fine UV detection signal 1a originating a preamplifier 5 for amplifying the 2a, is composed by a buffer amplifier 7 which is connected via a coaxial cable 6 to the pre-amplifier 5
You.

Further, the memory scope 8 capable of displaying the ultraviolet detection signals 1a and 2a transmitted by the communication means 4, the interval between the ultraviolet detectors 1 and 2, and the communication means 4
Transmission time difference between the transmitted ultraviolet detection signals 1a and 2a
Is connected to the buffer amplifier 7 with the computing unit 22 for calculating the flame propagation speed based on

In order to shield the ultraviolet detectors 1 and 2 from sunlight or the like which hinders detection, a flame 9 emits a main body 9 capable of accommodating the ultraviolet detectors 1 and 2 as shown in FIG. In order to guide ultraviolet rays to the ultraviolet detectors 1 and 2, an adapter 11 comprising a thin tube 10 extending to the side of the main body 9 is provided, and the ultraviolet detectors 1 and 2 are housed in the main body 9 of the adapter 11 and disposed on an actual machine. .

Next, as an embodiment in which the flame propagation velocity measuring device is applied to an actual machine, the ultraviolet detectors 1 and 2 housed in the adapter 11 are connected to an ATR (air turbo ram jet).
In the case where the present invention is applied to an engine (see FIG. 3) , an air duct 12 having an air inlet 13 at a tip end portion is described.
And a fan 14 arranged in the air duct 12 and a tip
Air duct with turbine inlet manifold 15
A hydrogen duct 17 surrounding the fan 12 and a fan 14
From the turbine inlet manifold 15
The fan 14 is driven by the hydrogen supplied to the
Tip turbine 16 and the rear end of hydrogen duct 17
A continuous combustion duct 19 and a rear end of the air duct 12 are provided.
The beam mixer 18 and the fuel connected to the rear end of the hydrogen duct 17
The combustion duct 19 and the fuel
An ATR engine having a flame stabilizing unit 20 disposed in a burning duct 19 and having a combustion chamber 21 inside the combustion duct 19 behind the flame stabilizing unit 20 has two ultraviolet detectors 1, 2.
In the direction in which the combustion duct 19 extends,
At a distance of 0 mm, the thin tube 10 of the adapter 11 keeps flame
The wall of the combustion duct 19 in the duct radial direction
It is attached so that it penetrates.

In the above-described ATR engine, the turbine inlet
When hydrogen is supplied to the manifold 15, the expansion process
Energy is transmitted to the fan 14 via the chip turbine 16
The fan 14 is transmitted from the air intake 13
Air is sucked into the air duct 12 and the combustion duct is
Combustion from the hydrogen duct 17
The flow of air toward the charging duct 19 is
They are mixed and diffused into the combustion chamber 21.

When the mixed flow of air and hydrogen ignites,
The flame 3 which goes backward from the flame stabilizer 20 is generated, and the flame 3
Detection signal from the ultraviolet detectors 1 and 2 with the propagation of
1a and 2a are sequentially transmitted, and
Is transmitted to the memory scope 8 and the arithmetic unit 22.

The memory scope 8 has a position close to the flame holder 20.
The ultraviolet ray detection signal 1a from the ultraviolet ray detector 1
14 downstream from the ultraviolet detector 1 in the propagation direction of the flame 3
UV detection from the UV detector 2 located 0 mm away
The outgoing signal 2a is the transmission of the respective detection signals 1a, 2a.
According to the time difference S, it is displayed in a form as shown in FIG.
The arithmetic unit 22 calculates the flame propagation speed based on the following equation.
Ask for.

[0021]

(Equation 1) Su = L / S

Here, Su: flame propagation speed (m / sec) L: interval between two ultraviolet detectors (mm) S: transmission time difference (msec) of ultraviolet detection signal detected by each ultraviolet detector

That is, the violet light from each of the ultraviolet detectors 1 and 2
The transmission time difference S between the outside line detection signals 1a and 2a is, for example, 90
msec , the flame propagation speed Su is:
It is 56 m / sec.

As described above, the flame propagation velocity meter of the present embodiment is used.
In the measuring device, the ultraviolet light emitted by the flame 3 is
Detected by emitters 1 and 2 and purple on the upstream side in flame 3 propagation direction
The distance L between the outside line detector 1 and the downstream ultraviolet ray detector 2,
And ultraviolet detection signals 1a, 2 from the ultraviolet detectors 1, 2
The flame propagation speed is determined based on the transmission time difference S of a.
Thus, it becomes possible to measure the propagation speed of the hydrogen diffusion flame, and to consider the improvement of the combustion performance of the ATR engine and the analysis of combustion data from a new standpoint, and to obtain a clue to the improvement design of the ATR engine.

It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the present invention.

[0026]

According to the flame velocity measuring device of the present invention, various excellent effects can be obtained as follows.

I) The ultraviolet rays emitted from the flame are detected by a plurality of ultraviolet rays.
Detected by the output unit, and detects ultraviolet rays on the upstream side in the flame propagation direction
Between the detector and the downstream UV detector, and the UV detector
Flame propagation based on the transmission time difference of UV detection signal from
Measure the speed of propagation of the diffusion flame because you want the speed
Becomes possible.

II) According to the item I), there is a great economic effect such that the combustion performance of an actual machine such as an ATR engine that produces a hydrogen diffusion flame can be improved.

[Brief description of the drawings]

FIG. 1 is a system diagram of a flame propagation velocity measuring device according to the present invention.

FIG. 2 is a cross-sectional view schematically showing an ultraviolet detector related to FIG.

FIG. 3 is a layout diagram of an ultraviolet detector provided in an actual ATR (air turbo ramjet) engine.

FIG. 4 is a display example of an ultraviolet detection signal of a memory scope related to FIG. 1;

FIG. 5 is a cross-sectional view illustrating an example of a flame related to measurement of a flame propagation speed by a conventional photographic method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Ultraviolet detector 1a Ultraviolet detection signal 2 Ultraviolet detector 2a Ultraviolet detection signal 3 Flame 4 Communication means 8 Memory scope 11 Adapter 22 arithmetic unit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-52922 (JP, A) JP-A-2-55654 (JP, A) JP-A-52-14236 (JP, A) 101443 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01P 5/18-5/22 G01P 3/36-3/40

Claims (1)

(57) [Claims] 1. A predetermined distance from the flame propagation direction
UV light emitted from the flames
At least two known UV detectors and each UV detector
An adapter that houses the output device and blocks the light beam that interferes with detection
A descriptor, a communication unit, wherein the ultraviolet detector transmits ultraviolet detection signal transmitted, a memory scope capable of displaying an ultraviolet detection signal transmitted by the communication means, UV detection
The distance between the transmitters and each ultraviolet ray transmitted by the communication means
Calculation to find the flame propagation speed based on the transmission time difference of outgoing signal
Measuring apparatus of the flame propagation speed, characterized by comprising a vessel.