JPH079084B2 - Runway fog removal method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to the gliding of an airport in which advective fog such as sea fog generated when hot and humid air over the Kuroshio flows over Oyashio continuously. The present invention relates to a method for removing fog on a runway that reduces the concentration of fog on the runway and enables safe takeoff and landing of an aircraft.

[Prior Art] FIG. 11 is an example of the prior art, and is a partially cutaway perspective view of a method of removing fog at an airport using a CO ₂ laser described in J.AIRCRAFT magazine VOL.8, No.2. . In FIG. 11, 51 is a runway, 52 is a CO ₂ laser oscillator, 53 is a distribution tunnel, and 54 is C.
O ₂ laser beam, 55 is a reflecting mirror. Distribution tunnels 53 are provided in parallel on both sides of the runway 51 along the runway 51, and CO ₂ laser oscillators 52 are arranged in the distribution tunnels 53, respectively. A grating is laid on the distribution tunnel 53 at the same level as the plane of the runway 51 so as not to interfere with the takeoff and landing of the aircraft. A plurality of reflecting mirrors 55 are installed in each distribution tunnel 53. When the aircraft takes off and landing, the necessary visibility and range are defined, and the CO ₂ laser oscillating unit within the range is activated to oscillate the CO ₂ laser beam 54. The oscillated CO ₂ laser beam 54 is diffused by the reflecting mirror 55 so as to obtain a necessary irradiation area for the fog on the runway 51, and the CO ₂ laser beam 54 is laid on the distribution tunnel 53. When illuminated in the fog through the grating, the grating is weakened to a level where it is not damaged. In this way, the CO ₂ laser beam 54 radiated in the mist on the runway 51 is absorbed in the fine water particles forming the mist and excites thermal motion to evaporate the fine water particles. As a result, the fog at the irradiation portion of the CO ₂ laser beam 54 is dissipated and good visibility can be obtained.

[Problems to be Solved by the Invention] As described above, even in the above-described conventional technology, it is considered that there is a possibility that the fog on the runway may be locally dissipated to allow the aircraft to take off and land visually. To be done.

However, in the above conventional technique, the mist on the runway is directly irradiated with the CO ₂ laser beam, and the fine water particles are evaporated only by the energy of the laser beam. Therefore, it is possible to dissipate the mist on the runway that is almost stationary, such as the radiant mist, by irradiating it for a short time. However, since it is necessary to continuously irradiate the aircraft for the period required for takeoff and landing, the energy consumed by it has to be extremely large and uneconomical.

[Means for Solving the Problems] The present invention relates to such a problem, with respect to advancing fog that continuously flows in with a smaller capital investment than the conventional one and a significantly lower facility operating cost than the conventional one. It dissipates this efficiently and resists the runway de-fog method that allows safe visual takeoff and landing of aircraft. The means is achieved by the runway mist removal method described in the previous claims.

That is, 1. At the airport where advancing fog flows in, a method of removing fog from a runway in which a local fog dissipating facility and a black heat absorber are arranged at the end of the aircraft runway.

2. The method for removing fog from a runway according to claim 1, wherein the local fog dispersal equipment is a CO ₂ laser equipment.

3. The method for removing mist from a runway according to claim 1, wherein the local fog dispersal equipment is compressed air jetting equipment.

4. The method for removing fog from a runway according to claim 1, wherein the local fog dispersal equipment is far infrared radiation equipment.

5. The method for removing fog from a runway according to claim 1, wherein the local fog dispersal equipment is water particle spray equipment.

Is. Hereinafter, the operation and the like of the present invention will be described based on Examples.

[Embodiment] FIGS. 1 to 8 are views showing an embodiment based on the present invention, and FIGS.
FIG. 1 is a diagram for explaining the concept of action and effect based on the present invention. FIG. 1 is a partially cutaway side view of a runway when a CO ₂ laser beam is used as a local extinguishing fog dissipating means, and FIG. 1 is a partially cutaway perspective view, and FIG. 3 is a partially cutaway side view of a runway when compressed air is used as a local dispersal means for advancing fog, FIG.
FIG. 5 is a partially cutaway perspective view of FIG. 3, FIG. 5 is a partially cutaway side view of a runway in the case of using a far infrared radiation element as a local extinguishing fog dissipating means, and FIG. Part broken perspective view, 7th
The figure shows a partially broken side view of the runway in the case of using water particle spraying for the local dispersal means of advancing fog, FIG. 8 is a partially broken perspective view of FIG. 7, and FIG. Fig. 10 is a plan view showing a reduced state of advancing fog on the runway when the method is carried out.
The figure is a partially cutaway side view of FIG.

1 to 10, 1 is a runway, 2 is an advancing fog, 3 is an advancing fog flow direction, 4 is a black heat absorber, 5 is sunlight, 6 is CO ₂
Laser beam, 7 CO ₂ laser power supply part, 8 CO ₂ laser oscillation part, 9 compressed air, 10 air jet nozzle, 11 air compressor, 12 intake duct, 13 intake port, 14 far infrared Radiant panel, 15 far infrared rays, 16 power source, 17 spray water, 18 water spray nozzle, 19 water pump, 20 water tank, 21
Is a spray water recovery ditch, and 22 is a fog local dissipation facility. The advective fog seen in the Pacific coastal region of northern Japan is 5 m of sea fog that is generated when hot and humid air over the Kuroshio flows along with the air current and is cooled as it passes over Oyashio, which has a low water temperature.
In many cases, a south wind is introduced at a speed of less than / s, and it usually has a specific direction. The present invention utilizes the above-mentioned characteristics of advection fog to obtain the visibility required for takeoff and landing of an aircraft by using economical equipment and a more efficient operation method than before, especially for advection fog on an airport runway. Is.

First, FIGS. 1 and 2 show the first embodiment.
Part of the case where the equipment for irradiating the advancing fog 2 with the CO ₂ laser beam 6 is installed at the end of the inflow side fog 2 and the black endothermic body 4 is laid downstream of the CO ₂ laser beam 6 irradiating equipment in the previous term. It is a broken side view and a partially broken perspective view. When the aircraft visually takes off and landes under the weather where advective fog 2 is flowing in advective fog flow direction 3 on runway 1, first CO ₂
Running a CO ₂ laser system configured by a laser power supply unit 7 and the CO ₂ laser oscillator unit 8 or the like, CO ₂
A laser beam 6 is emitted into the advancing fog 2. The CO ₂ laser is absorbed by fine water particles forming a mist with infrared rays having a wavelength of 10.6 μm, excites thermal motion, raises the temperature of the water particles and evaporates. Along with this, a cut of the advancing fog 2 is formed above the CO ₂ laser system, and sunlight 5 is irradiated onto the runway 1 from above the cut. A black endothermic body 4 is laid on the ground surface on the downstream side of the CO ₂ laser system, and the cuts are clearer as they are closer to the emission part of the CO ₂ laser beam 6, so that the sunlight that is irradiated at that part is also strong, The black heat absorbing body 4, which is composed of an aluminum plate or the like subjected to black alumite processing as a surface material, absorbs the sunlight 5 to heat up and store heat. The CO ₂ laser beam 6 is emitted for a certain period of time, the advancing fog 2 is dissipated, and the irradiation of the CO ₂ laser beam 6 is stopped while the black heat absorbing body 4 is absorbing heat by the irradiation of the sunlight 5. Since the advective fog 2 is always advancing to the leeward side along with the airflow, the break of the advective fog 2 artificially created also moves to the downstream side accordingly, and CO ₂
The upper part of the laser system and the black heat sink 4 is covered by the newly advancing advancing mist 2. At this point, the black heat absorbing body 4 is in a state of sufficiently absorbing heat, so that heat is transferred from the black heat absorbing body 4 to the upper advancing mist 2 by contact or radiation. Since the advancing fog has a property of being dissipated when the ambient temperature rises by several degrees (2 to 3 ° C.), the portion of the advancing fog above the black heat absorbing body 4 near the inner ground surface is heated and dissipated. When this state is maintained and the effect of dissipating the advancing fog 2 due to heat radiation from the black heat absorber 4 decreases, CO ₂
The laser system is operated to irradiate the advancing fog 2 with the CO ₂ laser beam 6 to generate a break in the advancing fog 2. The break of the generated advection fog 2 moves to the leeward side according to the air flow, but during that time, the sunlight 5 irradiated from above the break heats the side cross section of the break of the advection fog 2 to raise the temperature and evaporate the advection fog. Then, the separated advancing fog 2 disappears, or the concentration on the runway 1 is reduced to such an extent that the aircraft can visually take off and land.

FIGS. 3 to 4 show the second embodiment, in which compressed air is used as a means for forming a break for introducing the sunlight 5 in the advection fog 2 arranged at the end of the advection fog 2 inflow side of the runway 1. This is an example of adopting the method of spraying. When forming a break for introducing the sunlight 5 in the advancing fog 2 flowing in from the advancing fog flow direction 3 on the runway 1, first, the air compressor 11 is operated to suck the air from the intake port 13 and suck it. After being guided to the air compressor 11 through the duct 12 and pressurized, the advancing mist 2 from the air jet nozzle 10
Compressed air 9 is ejected into the inside. The jetted compressed air 9 scatters water droplets forming a mist, and also causes a turbulent flow due to the generation of an upward flow due to the jetting, and the high-temperature dry air in the upper layer of the advection mist 2 and the low-temperature wet air in the lower layer. The temperature of the low temperature moist air in the lower layer is increased by mixing with and to evaporate and dissipate the fine water particles forming the mist to form a break for introducing the sunlight 5 in the advancing mist 2. . Regarding the action of the black heat absorbing body 4 laid on the ground surface on the downstream side of the compressed air jet nozzle on the absorption of the sunlight 5 and the advancing fog 2 and the operating procedure of the compressed air, refer to the first section.
This is the same as the case of the embodiment.

FIGS. 5 to 6 show the third embodiment, in which far infrared rays are used as a means for forming a break for introducing the sunlight 5 in the advection fog 2 arranged at the end of the advection fog 2 inflow side of the runway 1. This is an example of adopting a method of irradiating with. A far-infrared radiation system having a structure in which a nichrome wire is installed in a panel whose surface has been coated with, for example, ceramics or paint having a high emissivity in the far-infrared region, is provided at the end of the runway 1 on the inflow side mist 2 inflow side. The thermal energy generated by arranging and activating the power supply unit 16 to energize the nichrome wire is transferred to the ceramics or paint, and far infrared rays are radiated from the surface of the ceramics into the upper advancing mist 2. It The advection fog 2 that has been irradiated with far-infrared rays rises in temperature, evaporates, and dissipates, so that a break occurs in the advection fog 2. The sunlight 5 radiated from the cuts absorbs heat and raises the temperature of the black heat absorber 4 arranged on the leeward ground surface of the far-infrared radiation system.
The advection fog 5 that is irradiated with the temperature rises and evaporates while advancing to the leeward side of the air stream, and the concentration thereof is significantly reduced. The operation of the black heat absorber 4 and the operating procedure of the far infrared radiation system are the same as in the case of the first embodiment.

FIGS. 7 to 8 show the fourth embodiment, in which water is used as a means for forming a break for introducing the sunlight 5 in the advection fog 2 arranged at the end of the advection fog 2 inflow side of the runway 1. This is an example of adopting a method of spraying. At the end of the runway 1 on the advancing mist 2 inflow side, a water spraying system constituted by a water spraying nozzle 18, a water pump 19, a water storage tank 20, a sprayed water recovery groove 21 and the like is arranged. On the leeward side ground surface of the water spraying system, a black heat absorber 4 constituted by using a black alumite-treated aluminum plate or the like as a surface material is laid. When the advancing fog 2 flows into the runway 1 from the advancing fog flow direction 3, first the water pump 19 is operated to pressurize the water in the water storage tank 20, and the advection from the upper water spray nozzle 18 to the upper part. Eject into fog 2. When the fine particles of water ejected fall in the advancing mist 2, they merge with the fog flow and fall, whereby the concentration of the advancing mist 2 is significantly reduced. A spray water recovery groove 21 is laid on the ground surface on the windward side of the water spray nozzle 18, and spray water 17 ejected from the water spray nozzle 18 and fog particles that have been merged with the spray water 17 and dropped on the ground surface. And collect in the water tank 20. As a result, it is possible to prevent water from accumulating around the water spraying system, and to save water and reduce costs by circulating the sprayed water. The upper surface of the spray water collecting groove may be left open as shown in FIG. 8, but an iron grid-like lid may be laid so as to maintain the same level as the ground surface for the purpose of ensuring safety.

FIGS. 9 to 10 are views showing a reduced state of the advancing fog 2 on the runway 1 when the fog removing method according to the present invention as described in the first to fourth embodiments is carried out. 9th-10th
In the figure, when the advancing fog 2 flows into the runway 1 from the advancing fog flow direction 3, first, the above-mentioned embodiments are described.
Operate the fog local extinction equipment 22 using CO ₂ laser beam, compressed air, far infrared radiation element, water particles, etc. to extinguish the advection fog 2 on the fog local extinction equipment 22 and sunlight in the advection fog 2 5 Form a slit for introduction. The black heat absorber 4 is laid on the leeward side of the fog local heat dissipation facility 22, and the black heat absorber 4 is heated and stores heat by the sunlight 5 emitted from the cut for introducing the sunlight 5. Local fog dispersal equipment 22
After operating for a certain period of time, the gap of the advancing fog 2 of sufficient width and the sufficient heat storage of the black heat absorber 4 are stored, and then the fog local dissipation facility
Stop 22 operations. The advancing fog 2 is always advancing to the leeward side along with the air current, so that the break of the advancing fog 2 artificially formed also moves to the downstream side, and the fog local extinguishing equipment 22 and the black heat absorber 4 The upper part is covered by the newly advancing advancing mist 2. At this point, the black heat absorbing body 4 is in a state of sufficiently absorbing heat, so that heat is transferred from the black heat absorbing body 4 to the upper advancing mist 2 by contact or radiation. All fog, including advection fog, has the property of being dissipated when the ambient temperature rises by several degrees (2 to 3 ° C) regardless of the cause of occurrence, so the inner surface of the advection fog above the black heat absorber 4 The part near the temperature rises and dissipates. When this state is maintained and the effect of dissipating the advancing fog 2 due to the heat radiation from the black heat absorber 4 is reduced, the fog local extinction equipment is operated again to generate a break in the advancing fog 2. The notch of the generated advective fog 2 moves to the leeward side according to the air flow, but during that time, the sunlight 5 irradiated from above the break heats the side cross section of the break of the advective fog 2 to raise the temperature of the advective fog, Evaporation continues, and finally the separated advective fog 2 disappears, or the concentration on the runway 1 is reduced to such an extent that the aircraft can visually take off and land.

[Effects of the Invention] As described in the above embodiments, the present invention provides a fog local dissipation facility and a black heat absorber at the advancing fog inflow side end of a runway at an airport where advancing fog flows in. , A large amount of equipment cost and operating cost of arranging a large number of fog dispersal equipment along the runway as in the prior art and operating the fog dispersive equipment continuously during the takeoff and landing of the aircraft are required. Without using a single set of fog dispersal equipment and intermittent operation, the energy of sunlight is effectively used to dissipate or reduce the advancing fog on the runway with a simple structure and low operating costs. This has the effect of enabling safe takeoff and landing of aircraft.

[Brief description of drawings]

Fig. 1 is a partially cutaway side view of the runway when a CO ₂ laser beam is used as a means for locally dissipating advective fog, and Fig. 2 is
FIG. 3 is a partially cutaway perspective view of the drawing, FIG. 3 is a partially cutaway side view of the runway when compressed air is used as a local dispersal means for advancing fog, and FIG. 4 is a partially cutaway perspective view of FIG. Fig. 5 is a partially cutaway side view of the runway in the case where a far infrared radiation element is used as a local extinguishing fog dispersal means, Fig. 6 is a partially broken perspective view of Fig. 5, and Fig. 7 is a local part of advection fog. FIG. 8 is a partially cutaway side view of the runway in the case of using water particle spraying for the extinguishing means, FIG. 8 is a partially cutaway perspective view of FIG. 7, and FIG. 9 is a case where the fog removing method according to the present invention is carried out. Plan view showing the reduced state of advancing fog on the runway,
FIG. 10 is a partially cutaway side view of FIG. FIG. 11 is an example of the prior art. 1 ... runway, 2 ... advection fog, 3 ... advection fog flow direction,
4 ...... black heat absorbers, 5 ...... sunlight, 6 ...... CO ₂ laser beam, 7 ...... CO ₂ laser power supply unit, 8 ...... CO ₂ laser oscillator unit, 9 ...... compressed air, 10 ...... air ejection Nozzle, 11 ...
… Air compressor, 12 …… Intake duct, 13 …… Intake port, 14…
Far-infrared radiation panel, 15-far-infrared radiation, 16-power supply, 17-spray water, 18-spray nozzle, 19-water pump, 20-water tank, 21-spray water collection groove , 22 …… local fog dissipating equipment, 51 …… runway, 52 …… CO ₂ laser oscillator, 5
3 …… Distribution tunnel, 54 …… CO ₂ laser beam, 55 ……
Reflector.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshio Tsuchida 118 Futatsuka, Noda City, Chiba Prefecture Kawasaki Heavy Industries Ltd. Noda Factory

Claims (5)

[Claims] 1. A method of removing fog from a runway, characterized by disposing a local fog dissipating facility and a black heat absorber at an end of an aircraft runway at an airport into which advancing fog flows. 2. The runway fog removal method according to claim 1, wherein the local fog dispersal equipment is a CO ₂ laser equipment. 3. The method for removing fog from a runway according to claim 1, wherein the local fog dissipating equipment is compressed air jetting equipment. 4. The method of removing fog from a runway according to claim 1, wherein the local fog dispersal equipment is far infrared radiation equipment. 5. The method for removing fog from a runway according to claim 1, wherein the local fog dispersal equipment is water particle spray equipment.