SU1516124A1 - Method of putting out fires - Google Patents

Abstract

The invention relates to fire fighting equipment, in particular, to methods for extinguishing a fire in an open space - forest top and burning oil spills. The purpose of the invention is to increase the efficiency and speed of extinguishing. The method of fire extinguishing includes the impact on the fire area of a shock wave, which is created using an aircraft flying over a fire area at supersonic speed corresponding to Mach number M≥√0.5Δ + 1.166 / 1.162SIN ² β, at a height of H≥√0.706 + 0.641 (PO ^. Δ) ^2. √2Q / PO ^. SINβ, where PO is the initial pressure (undisturbed) in the fire zone

Δ = P ₁ - PO is the pressure difference of the shock wave

P ₁ - pressure after shock wave

Q - frontal resistance of the aircraft for a given number M

β is the angle of inclination of the shock wave to the surface of the fire area. 3 il.

Description

The invention relates to technical means of extinguishing a fire in an open space, in particular, to methods of extinguishing high forest fire, burning oil spills, etc.

The purpose of the invention is to increase the efficiency of fire extinguishing.

FIG. 1 shows the effect of a shock wave on a forest fire in a vertical plane; in fig. 2 - pressure distribution in the shock wave; in fig. 3 - action of the shock wave 11, the plan.

The method is carried out as follows.

After determining the location of the fire, its fire intensity and the intensity of burning, the experts set the required pressure difference of the shock wave — the pressure difference in the front zone necessary to extinguish the fire. Based on the required differential pressure of the shock wave, determine the speed and altitude of the solid

,, / E, 5L + 1,166.

 17162:

. 06-0.641 (-) - - l / 20 / rG- sin p.

In the event of a fire, the pilots receive information from the scene of the fire, its characteristics and the estimated number M and flight altitude. After take-off, arrive at the fire site and inspect it and perform a maneuver so that, when flying directly over the fire area, the calculated restrictions on M and H are met.

The width S of the zone of impact of the shock wave of a moving solid on the fire area S 5H with data and H processes the fire by met- al-parallel galling in the direction of the preferential spread of the fire. The number of spans over the fire area is determined by

the formula, where D is the maximum

the linear dimension of the fire area in the direction perpendicular to the direction of flight.

SP

O5

to

Pos. Each flight of the flying ap- tiapaT comes on a parallel line, the turn is performed at the most minimum evolutive speed. An air jet arises over the fire when a yolot of an aeronautical fire blows off a wave and extinguishes the fire, knocking down the flames. However, depending on the nature of the knife, flights are possible in () different directions: it is possible to carry out the method by applying two or more flies: first aiHiapaTOB, which can be sent by knocking down the flames successively for each other. pas intersected courses, etc.

In the case of extinguishing a forest fire for ei o, current: 1, and the exit of the pilot apparatus to a predetermined supersonic mode of the events 1АК) t it is necessary to occupy the working height directly in front of (the front of the fire. В). a focused shock wave (super-shock) is created, and its iptepsivpost is 5–7 times the computational power required for a flame. (The pressure drop created in the case of an atom allows the trees to fall down and thus create a site that is protective of the top fire.

Example. For this purpose, a top fire array with a diameter of 50 km, a wave impact with a pressure difference of –leiiii L 0.02 kg / cm is necessary. The proposed plan is to use an IG-23 aircraft with an angle p of 30.

Ascep mipimal speed, scaling noluchepie, 02 kg / cm directly WB: 1izi aircraft., 42. Iriem is chosen. Mily for the MiG-23, the flight mode is c, which corresponds to Q 15000 kg. According to these formulas, m and 5 5000 m are determined. For

The fires of this fire shall be made no less than 10 flights on courses parallel to the spread of fire. In the event that after performing the estimated number of visits it was not possible to completely eliminate the high-level fire, repeated visits are carried out. The use of the method ensures the safety of work, efficiency and high performance of extinguishing fires, creates the possibility of extinguishing large areas of fires, intense forest mounted fires, fires in hard-to-reach places.

Claims (1)

Invention Formula 15 The fire blunt method, including the impact on the fire area of the shock wave, characterized in that, in order to increase the extinguishing efficiency, the shock wave is created to move over the fire area of the solid, the velocity M and the height H from which it is determined from the ratio 25 B, 5d + 1.1bb G162.5 / p | 3 thirty .7064-0.641 () - where L is the pressure difference; Dr. - I. where I,} 1st;  2Q / Pi, .. smp, behind the shock wave - pressure behind the shock wave p is the angle of inclination of the shock wave to the surface of the knife; P (| patchal pressure in the fire zone; Q - frontal resistance of a solid at a given number M. -e (re.e.