Термобарическое оружие: принцип действия и характеристики

Device producing a high temperature explosion

A thermobaric weapon, also called an aerosol bomb, or a vacuum bomb, is a type of explosive munition that works by dispersing an aerosol cloud of gas, liquid or powdered explosive. The fuel is usually a single compound, rather than a mixture of multiple molecules. Many types of thermobaric weapons can be fitted to hand held launchers, and can also be launched from airplanes.

The term thermobaric is derived from the Greek words for 'heat' and 'pressure': thermobarikos (θερμοβαρικός), from thermos (θερμός) 'hot' + baros (βάρος) 'weight, pressure' + suffix ikos ( ικός) ' ic'. Other terms used for the family of weapons are high impulse thermobaric weapons, heat and pressure weapons, vacuum bombs, and fuel air explosives (FAE).

Most conventional explosives consist of a fuel–oxidizer premix, but thermobaric weapons consist only of fuel and as a result are significantly more energetic than conventional explosives of equal weight. Their reliance on atmospheric oxygen makes them unsuitable for use under water, at high altitude, and in adverse weather. They are, however, considerably more effective when used in enclosed spaces such as tunnels, buildings, and non hermetically sealed field fortifications (foxholes, covered slit trenches, bunkers). The initial explosive charge detonates as it hits its target, opening the container and dispersing the fuel mixture as a cloud. The typical blast wave of a thermobaric weapon lasts significantly longer than that of a conventional explosive. In contrast to an explosive that uses oxidation in a confined region to produce a blast front emanating from a single source, a thermobaric flame front accelerates to a large volume, which produces pressure fronts within the mixture of fuel and oxidant and then also in the surrounding air. Thermobaric explosives apply the principles underlying accidental unconfined vapor cloud explosions, which include those from dispersions of flammable dusts and droplets. Such dust explosions happened most often in flour mills and their storage containers, and later in coal mines, prior to the 20th century. Accidental unconfined vapor cloud explosions now happen most often in partially or completely empty oil tankers, refinery tanks, and vessels, such as the Buncefield fire in the United Kingdom in 2005, where the blast wave woke people from its center. A typical weapon consists of a container packed with a fuel substance, the center of which has a small conventional explosive "scatter charge". Fuels are chosen on the basis of the exothermicity of their oxidation, ranging from powdered metals, such as aluminum or magnesium, to organic materials, possibly with a self contained partial oxidant. The most recent development involves the use of nanofuels. A thermobaric bomb's effective yield depends on a combination of a number of factors such as how well the fuel is dispersed, how rapidly it mixes with the surrounding atmosphere and the initiation of the igniter and its position relative to the container of fuel. In some designs, strong munitions cases allow the blast pressure to be contained long enough for the fuel to be heated well above its autoignition temperature so that once the container bursts, the superheated fuel autoignites progressively as it comes into contact with atmospheric oxygen. Conventional upper and lower limits of flammability apply to such weapons. Close in, blast from the dispersal charge, compressing and heating the surrounding atmosphere, has some influence on the lower limit. The upper limit has been demonstrated to influence the ignition of fogs above pools of oil strongly. That weakness may be eliminated by designs in which the fuel is preheated well above its ignition temperature so that its cooling during its dispersion still results in a minimal ignition delay on mixing. The continual combustion of the outer layer of fuel molecules, as they come into contact with the air, generates added heat which maintains the temperature of the interior of the fireball, and thus sustains the detonation. In confinement, a series of reflective shock waves is generated, which maintain the fireball and can extend its duration to between 10 and 50 ms as exothermic recombination reactions occur. Further damage can result as the gases cool and pressure drops sharply, leading to a partial vacuum. This rarefaction effect has given rise to the misnomer "vacuum bomb". Piston type afterburning is also believed to occur in such structures, as flame fronts accelerate through it.

A fuel–air explosive (FAE) device consists of a container of fuel and two separate explosive charges. After the munition is dropped or fired, the first explosive charge bursts open the container at a predetermined height and disperses the fuel in a cloud that mixes with atmospheric oxygen (the size of the cloud varies with the size of the munition). The cloud of fuel flows around objects and into structures. The second charge then detonates the cloud and creates a massive blast wave. The blast wave can destroy reinforced buildings, equipment, and kill or injure people. The antipersonnel effect of the blast wave is more severe in foxholes and tunnels and in enclosed spaces, such as bunkers and caves.

FAEs were developed by the United States for use in the Vietnam War. The CBU 55 FAE fuel air cluster bomb was mostly developed by the US Naval Weapons Center at China Lake, California. Since the 2003 invasion of Iraq, the US Marine Corps has introduced a thermobaric "Novel Explosive" (SMAW NE) round for the Mk 153 SMAW rocket launcher. One team of Marines reported that they had destroyed a large one story masonry type building with one round from The AGM 114N Hellfire II, uses a Metal Augmented Charge (MAC) warhead, which contains a thermobaric explosive fill that uses aluminum powder coated or mixed with PTFE layered between the charge casing and a PBXN 112 explosive mixture. When the PBXN 112 detonates, the aluminum mixture is dispersed and rapidly burns. The result is a sustained high pressure that is extremely effective against people and structures.

Following FAEs developed by the United States for use in the Vietnam War, such as the RPO A. The Russian armed forces have developed thermobaric ammunition variants for several of their weapons, such as the TBG 7V thermobaric grenade with a lethality radius of , which can be launched from a rocket propelled grenade (RPG) RPG 7. The GM 94 is a pump action grenade launcher designed mainly to fire thermobaric grenades for close combat. The grenade weighed and contained of explosive, its lethality radius is , but due to the deliberate "fragmentation free" design of the grenade, a distance of is considered safe. The RPO A and upgraded RPO M are infantry portable rocket propelled grenades (RPGs), designed to fire thermobaric rockets. The RPO M, for instance, has a thermobaric warhead with a TNT equivalence of and destructive capabilities similar to a high explosive fragmentation artillery shell. The RShG 1 and the RShG 2 are thermobaric variants of the RPG 27 and RPG 26 respectively. The RShG 1 is the more powerful variant, with its warhead having a lethality radius and producing about the same effect as of TNT. The RMG is a further derivative of the RPG 26 that uses a tandem charge warhead, with the precursor high explosive anti tank (HEAT) warhead blasting an opening for the main thermobaric charge to enter and detonate inside. The RMG's precursor HEAT warhead can penetrate 300 mm of reinforced concrete or over 100 mm of rolled homogeneous armour, thus allowing the diameter thermobaric warhead to detonate inside. Other examples include the semi automatic command to line of sight (SACLOS) or millimeter wave active radar homing guided thermobaric variants of the 9M123 Khrizantema, the 9M133F 1 thermobaric warhead variant of the 9M133 Kornet, and the 9M131F thermobaric warhead variant of the 9K115 2 Metis M, all of which are anti tank missiles. The Kornet has since been upgraded to the Kornet EM, and its thermobaric variant has a maximum range of and has a TNT equivalence of The 9M55S thermobaric cluster warhead rocket was built to be fired from the BM 30 Smerch MLRS. A dedicated carrier of thermobaric weapons is the purpose built TOS 1, a 24 tube MLRS designed to fire thermobaric rockets. A full salvo from the TOS 1 will cover a rectangle The Iskander M theatre ballistic missile can also carry a thermobaric warhead. Many Russian Air Force munitions also have thermobaric variants. The S 8 rocket has the S 8DM and S 8DF thermobaric variants. The S 8's brother, the S 13, has the S 13D and S 13DF thermobaric variants. The S 13DF's warhead weighs only , but its power is equivalent to of TNT. The KAB 500 OD variant of the KAB 500KR has a thermobaric warhead. The ODAB 500PM and ODAB 500PMV unguided bombs carry a fuel–air explosive each. ODAB 1500 is a larger version of the bomb. The KAB 1500S GLONASS/GPS guided bomb also has a thermobaric variant. Its fireball will cover a radius and its lethal zone is a radius. The 9M120 Ataka V and the 9K114 Shturm ATGMs both have thermobaric variants. In September 2007, Russia exploded the largest thermobaric weapon ever made, and claimed that its yield was equivalent to that of a nuclear weapon. Russia named this particular ordnance the "Father of All Bombs" in response to the American developed Massive Ordnance Air Blast (MOAB) bomb, which has the backronym "Mother of All Bombs" and once held the title of the most powerful non nuclear weapon in history.

Iraq was alleged to possess the technology as early as 1990. A prototype was tested successfully in a foreign location out of safety and confidentiality concerns. The Spanish Air and Space Force has an undetermined number of BEACs in its inventory.

In 1996, the People's Liberation Army (PLA) began development of the 97式单兵云爆火箭筒, a portable thermobaric rocket launcher, based on the Soviet RPO A Shmel. Introduced in 2000 it is reported to weigh 3.5 kg and contains 2.1 kg of thermobaric filler. An improved version called the PF 97A was introduced in 2008. China is reported to have other thermobaric weapons, including bombs, grenades and rockets. Research continues on thermobaric weapons capable of reaching 2,500 degrees.

In 2004, under request of EMAER (Estado Maior da Aeronáutica Military Staff of Aeronautics) and DIRMAB (Diretoria de Material Aeronáutico e Bélico Board of Aeronautical and Military Equipment) the IAE (Instituto de Aeronautica e Espaço Institute of Aeronautics and Space) started developing a Thermobaric project called Trocano
Trocano (tɾoˈkɐnu) is a thermobaric weapon similar in design to the United States' MOAB weapon or Russia's FOAB. Like the US weapon, the Trocano was designed to be pallet loaded into a C 130 Hercules "Hércules" (ˈɛʁkuleʃ) aircraft, and deployed using a parachute to drag it from the C 130's cargo bay and separate from its pallet, at which point the bomb's own aerodynamics determine its drop trajectory.

In 2009, the British Ministry of Defence (MoD) acknowledged that Army Air Corps (AAC) AgustaWestland Apaches had used AGM 114 Hellfire missiles purchased from the United States against Taliban forces in Afghanistan. The MoD stated that 20 missiles, described as "blast fragmentation warheads", were used in 2008 and a further 20 in 2009. MoD officials told Guardian journalist Richard Norton Taylor that the missiles were "particularly designed to take down structures and kill everyone in the buildings", as AAC AgustaWestland Apaches were previously equipped with weapon systems deemed ineffective to combat the Taliban. The MoD also stated that "British pilots' rules of engagement were strict and everything a pilot sees from the cockpit is recorded." In 2018, the MoD accidentally divulged the details of General Atomics MQ 9 Reapers utilised by the Royal Air Force (RAF) during the Syrian civil war, which revealed that the drones were equipped with AGM 114 Hellfire missiles. The MoD had sent a report to a British publication, Drone Wars, in response to a freedom of information request. In the report, it was stated that AGM 114N Hellfire missiles which contained a thermobaric warhead were used by RAF attack drones in Syria.

Based on the high explosive squash head (HESH) round, a 120 mm thermobaric round was developed in the 2010s by the Indian Ministry of Defence. This HESH round packs thermobaric explosives into the tank shells to increase the effectiveness against enemy bunkers and light armoured vehicles. The design and the development of the round was taken up by Armament Research and Development Establishment (ARDE). The rounds were designed for the Arjun MBT. The TB rounds contains fuel rich explosive composition called thermobaric explosive. As the name implies, the shells, when they hit a target, produce blast overpressure and heat energy for hundreds of milliseconds. The overpressure and heat causes damage to enemy fortified structures like bunkers and buildings and for soft targets like enemy personnel and light armoured vehicles.

The company Balkan Novoteh, formed in 2011, provides the Thermobaric hand grenade TG 1 to the market.

In 2017 Ukroboronprom's Scientific Research Institute for Chemical Products in conjunction with Артем (холдингова компанія) (aka Artem Holding Company) announced to the market its new product, the РГТ 27С. These can be combined with the РПВ 16 grenade launcher, a demonstration of which was witnessed by Oleksandr Turchynov. The grenades, of approximately 600 grams, "create a two second fire cloud with a volume of not less than 13 m³, inside of which the temperature reaches 2,500 degrees. This temperature allows not only for the destruction of the enemy, but are also able to disable lightly armored vehicles." The firm showed them at the Azerbaijan International Defense Exhibition in 2018.

Mexico, Switzerland and Sweden presented in 1980 a joint motion to the United Nations to prohibit the use of thermobaric weapons, to no avail.

FAEs such as first generation CBU 55 fuel air weapons saw extensive use in the Vietnam War. A second generation of FAE weapons were based on those, and were used by the United States in Iraq during Operation Desert Storm. A total of 254 CBU 72s were dropped by the United States Marine Corps, mostly from A 6Es. They were targeted against mine fields and personnel in trenches, but were more useful as a psychological weapon. The US military also used thermobaric weapons in Afghanistan. On 3 March 2002, a single laser guided thermobaric bomb was used by the United States Air Force against cave complexes in which Al Qaeda and Taliban fighters had taken refuge in the Gardez region of Afghanistan. The SMAW NE was used by the US Marines during the First Battle of Fallujah and the Second Battle of Fallujah. The AGM 114N Hellfire II was first used by US forces in 2003 in Iraq.

FAEs were reportedly used against China in the 1969 Sino Soviet border conflict. MiG 27 attack aircraft of the 134th APIB also used ODAB 500S/P fuel air bombs against Mujahideen forces in Afghanistan, but they were found to be unreliable and dangerous to ground crew.

Russian military forces reportedly used ground delivered thermobaric weapons during the Battle for Grozny (first and second Chechen Wars) to attack dug in Chechen fighters. The use of TOS 1 heavy MLRS and "RPO A Shmel" shoulder fired rocket system during the Chechen Wars is reported to have occurred. Russia used the RPO A Shmel in the First Battle of Grozny, whereupon it was designated as a very useful round. At least three and as many as nine RPO A casings were later found at the positions of the Spetsnaz. In July 2005 the Russian government admitted to the use of the RPO A during the crisis. During the 2022 Russian invasion of Ukraine, CNN reported that Russian forces were moving thermobaric weapons into Ukraine. On 28 February 2022, Ukraine's ambassador to the United States accused Russia of deploying a thermobaric bomb.

During the War in Afghanistan, British forces, including the Army Air Corps and Royal Air Force, used thermobaric AGM 114N Hellfire missiles against the Taliban.

A report by Human Rights Watch claimed Israel has used thermobaric weaponry in the past including the 2008 2009 conflict in Gaza. Moreover, Euro Med Human Rights Monitor states that Israel appears to be using thermobaric weaponry in the current 2023 Israel Hamas War. Both organizations claim that the use of this weaponry in densely populated neighborhoods violates international humanitarian law due to its damaging affects on civilians and civilian structures.'''' The Eurasian Times reported that an Israeli AH 64D Apache attack helicopter was photographed with a 'mystery' warhead with a red band that was speculated to be a thermobaric warhead capable of destroying Hamas tunnels and multi story buildings. and in Kafar Batna. Others contend that in 2012 the Syrian government used an ОДАБ 500П bomb in Azaz. The Russia and Syrian governments have used thermobaric bombs and other thermobaric munitions during the Syrian civil war against insurgents and insurgent held civilian areas.

In March 2023 soldiers from the 59th Motorized Brigade of Ukraine showed off the destruction by a thermobaric RGT 27S2 hand grenade delivered by Mavic 3 drone of a derelict Russian infantry fighting vehicle.

Thermobaric and fuel–air explosives have been used in guerrilla warfare since the 1983 Beirut barracks bombing in Lebanon, which used a gas enhanced explosive mechanism that was probably propane, butane, or acetylene. The explosive used by the bombers in the US 1993 World Trade Center bombing incorporated the FAE principle by using three tanks of bottled hydrogen gas to enhance the blast. Jemaah Islamiyah bombers used a shock dispersed solid fuel charge, based on the thermobaric principle, to attack the Sari nightclub during the 2002 Bali bombings. In 2023, an Israeli reporter accused Hamas of firing thermobaric rockets into civilian houses as part of its October 7 surprise attack on Israel. Hamas and other Palestinian militant groups such as the Palestinian Islamic Jihad has claimed multiple attacks against Israeli forces with thermobaric rockets during the 2023 Israeli ground operation in the Gaza.

International law does not prohibit the use of thermobaric munitions, fuel air explosive devices, or vacuum bombs against military targets. as of 2024, all past attempts to regulate or restrict thermobaric weapons have failed.

In the 1995 film Outbreak, a thermobaric weapon (referred to as a fuel air bomb) is used to destroy an African village to keep the perfect biological weapon (a virus) a secret, and later nearly used to wipe out a US town to keep the original virus intact.